frontend v0.4.0

calling this v0.4.0

.gitignore

@@ -1,6 +1,9 @@
 */target
 .env
 .log*
+
 Cargo.lock
 .cargo/
+.sqlx/
+
 docker-compose*

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/chatapp.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/backend/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/backend/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/dataSources.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="chatapp dev" uuid="81992477-fd6f-427e-a27e-7378c26db6ef">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://100.118.108.58:5432/chatapp_dev</jdbc-url>
+      <jdbc-additional-properties>
+        <property name="com.intellij.clouds.kubernetes.db.host.port" />
+        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
+        <property name="com.intellij.clouds.kubernetes.db.container.port" />
+      </jdbc-additional-properties>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="externalProjectPath" value="$PROJECT_DIR$/android" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Eslint" enabled="true" level="WARNING" enabled_by_default="true" />
+  </profile>
+</component>

.idea/libraries/highlight_1_.xml

@@ -0,0 +1,9 @@
+<component name="libraryTable">
+  <library name="highlight(1)">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/backend/static/highlight(1).zip!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

@@ -0,0 +1,6 @@
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" project-jdk-name="25" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/chatapp.iml" filepath="$PROJECT_DIR$/.idea/chatapp.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

.zed/settings.json

@@ -10,6 +10,12 @@
           "command": "clippy" // rust-analyzer.check.command (default: "check")
         }
       }
+    },
+    "nu": {
+      "binary": {
+        "path": "/home/fantasypvp/.cargo/bin/nu",
+        "arguments": ["--lsp"]
+      }
     }
   }
 }

android/.gitignore

@@ -1,7 +1,9 @@
 *.iml
 .gradle
 /local.properties
+/keystore.properties
 /.idea/caches
+/.idea/.cache
 /.idea/libraries
 /.idea/modules.xml
 /.idea/workspace.xml
@@ -13,3 +15,4 @@
 .externalNativeBuild
 .cxx
 local.properties
+release/

android/.idea/deploymentTargetSelector.xml

@@ -4,6 +4,14 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2026-04-02T14:33:39.814557661Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=00319362N000094" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
       </SelectionState>
       <SelectionState runConfigName="MainActivity">
         <option name="selectionMode" value="DROPDOWN" />

android/app/build.gradle.kts

@@ -1,3 +1,5 @@
+import java.util.Properties
+
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.compose)
@@ -8,6 +10,25 @@ android {
     namespace = "dev.zxq5.chatapp.android"
     compileSdk = 35
 
+    val keystorePropertiesFile = rootProject.file("local.properties")
+    val keystoreProperties = Properties()
+    if (keystorePropertiesFile.exists()) {
+        keystoreProperties.load(keystorePropertiesFile.inputStream())
+    }
+
+    signingConfigs {
+        create("release") {
+            storeFile = file("${System.getProperty("user.home")}/keystores/chatapp.jks")
+            storePassword = keystoreProperties["KEYSTORE_PASSWORD"] as String? 
+                ?: System.getenv("KEYSTORE_PASSWORD") 
+                ?: ""
+            keyAlias = "chatapp"
+            keyPassword = keystoreProperties["KEY_PASSWORD"] as String? 
+                ?: System.getenv("KEY_PASSWORD") 
+                ?: ""
+        }
+    }
+
     defaultConfig {
         applicationId = "dev.zxq5.chatapp.android"
         minSdk = 26
@@ -20,19 +41,30 @@ android {
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true        // shrinks code
+            isShrinkResources = true      // removes unused resources
+            signingConfig = signingConfigs.getByName("release")
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"
             )
+            buildConfigField("String", "BASE_URL", "\"https://chat.zxq5.dev\"")
+        }
+        debug {
+            isMinifyEnabled = false
+            isDebuggable = true
+            applicationIdSuffix = ".debug"  // lets you install both side by side
+            buildConfigField("String", "BASE_URL", "\"http://zxq5-x1:8000\"")
         }
     }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
     }
     buildFeatures {
         compose = true
+        buildConfig = true
     }
 }
 
@@ -44,7 +76,6 @@ dependencies {
     implementation(libs.ktor.client.auth)        // Auth plugin
     // Kotlinx Serialization
     implementation(libs.kotlinx.serialization.json)
-
     // Coroutines
     implementation(libs.kotlinx.coroutines.android)
 

android/app/proguard-rules.pro

@@ -19,3 +19,29 @@
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
+
+# Ktor
+-keep class io.ktor.** { *; }
+-keep class kotlinx.coroutines.** { *; }
+
+# Kotlinx serialization
+-keepattributes *Annotation*, InnerClasses
+-dontnote kotlinx.serialization.AnnotationsKt
+-keep,includedescriptorclasses class dev.zxq5.chatapp.android.**$$serializer { *; }
+-keepclassmembers class dev.zxq5.chatapp.android.** {
+    *** Companion;
+}
+-keepclasseswithmembers class dev.zxq5.chatapp.android.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# Keep model classes (serialization needs these)
+-keep class dev.zxq5.chatapp.android.api.model.** { *; }
+-keep class dev.zxq5.chatapp.android.data.model.** { *; }
+
+# Fix for missing errorprone and javax annotations used by Tink and other libraries
+-dontwarn com.google.errorprone.annotations.**
+-dontwarn javax.annotation.**
+
+# Fix for missing java.lang.management referenced by Ktor (not available on Android)
+-dontwarn java.lang.management.**

android/app/src/main/AndroidManifest.xml

@@ -3,6 +3,10 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC"/>
+
 
     <application
         android:name=".ChatApplication"
@@ -15,6 +19,12 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Chatapp"
         android:usesCleartextTraffic="true">
+
+        <service
+            android:name=".core.service.MessageStreamService"
+            android:foregroundServiceType="dataSync"
+            android:exported="false"/>
+
         <activity
             android:name=".MainActivity"
             android:exported="true"

android/app/src/main/java/dev/zxq5/chatapp/android/ChatApplication.kt

@@ -1,11 +1,51 @@
 package dev.zxq5.chatapp.android
 
 import android.app.Application
-import dev.zxq5.chatapp.android.api.ApiClient
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.os.Build
+import dev.zxq5.chatapp.android.core.data.TokenStore
+import dev.zxq5.chatapp.android.data.repository.AuthRepository
+import dev.zxq5.chatapp.android.data.repository.ChatRepository
+import dev.zxq5.chatapp.android.data.repository.SettingsRepository
 
 class ChatApplication : Application() {
+
+    object AppState {
+        var isInForeground = false
+    }
+
+    val tokenStore by lazy { TokenStore(this) }
+    val authRepository by lazy { AuthRepository(tokenStore) }
+    val chatRepository by lazy { ChatRepository(tokenStore) }
+    val settingsRepository by lazy { SettingsRepository(tokenStore) }
+
     override fun onCreate() {
         super.onCreate()
-        ApiClient.init(this)
+        createNotificationChannels()
+    }
+
+    private fun createNotificationChannels() {
+        val messageChannel = NotificationChannel(
+            "messages",
+            "Messages",
+            NotificationManager.IMPORTANCE_HIGH
+        ).apply {
+            description = "New message notifications"
+            enableVibration(true)
+        }
+
+        // add this — required for the foreground service persistent notification
+        val serviceChannel = NotificationChannel(
+            "service",
+            "Background connection",
+            NotificationManager.IMPORTANCE_LOW
+        ).apply {
+            description = "Keeps messages running in background"
+        }
+
+        val manager = getSystemService(NotificationManager::class.java)
+        manager.createNotificationChannel(messageChannel)
+        manager.createNotificationChannel(serviceChannel)
     }
 }

android/app/src/main/java/dev/zxq5/chatapp/android/MainActivity.kt

@@ -4,47 +4,182 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.outlined.ChatBubbleOutline
+import androidx.compose.material.icons.outlined.PeopleOutline
+import androidx.compose.material.icons.outlined.Settings
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.NavigationBar
+import androidx.compose.material3.NavigationBarItem
+import androidx.compose.material3.NavigationBarItemDefaults
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
-import dev.zxq5.chatapp.android.model.ChatViewModel
-import dev.zxq5.chatapp.android.model.LoginState
-import dev.zxq5.chatapp.android.model.MainScreen
-import dev.zxq5.chatapp.android.ui.components.AuthScreen
-import dev.zxq5.chatapp.android.ui.components.ChatScreen
-import dev.zxq5.chatapp.android.ui.components.SettingsScreen
+import dev.zxq5.chatapp.android.ChatApplication.AppState
+import dev.zxq5.chatapp.android.core.service.MessageStreamService
+import dev.zxq5.chatapp.android.data.repository.AuthState
+import dev.zxq5.chatapp.android.feature.auth.AuthScreen
+import dev.zxq5.chatapp.android.feature.auth.AuthViewModel
+import dev.zxq5.chatapp.android.feature.chat.ChatScreen
+import dev.zxq5.chatapp.android.feature.chat.ChatViewModel
+import dev.zxq5.chatapp.android.feature.chat.Screen
+import dev.zxq5.chatapp.android.feature.contacts.ContactsScreen
+import dev.zxq5.chatapp.android.feature.settings.SettingsScreen
+import dev.zxq5.chatapp.android.feature.settings.SettingsViewModel
 import dev.zxq5.chatapp.android.ui.theme.ChatappTheme
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        
+        val app = application as ChatApplication
+        val authRepository = app.authRepository
+        val chatRepository = app.chatRepository
+        val settingsRepository = app.settingsRepository
+
         enableEdgeToEdge()
         setContent {
             ChatappTheme {
-                val viewModel: ChatViewModel = viewModel()
-                val loginState by viewModel.loginState.collectAsState()
-                val currentScreen by viewModel.currentScreen.collectAsState()
+                val authViewModel: AuthViewModel = viewModel(factory = ViewModelFactory(authRepository))
+                val chatViewModel: ChatViewModel = viewModel(factory = ViewModelFactory(chatRepository))
+                val settingsViewModel: SettingsViewModel = viewModel(factory = ViewModelFactory(settingsRepository))
                 
-                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
-                    androidx.compose.foundation.layout.Box(modifier = Modifier.padding(innerPadding)) {
-                        if (loginState is LoginState.Success) {
-                            when (currentScreen) {
-                                MainScreen.CHAT -> ChatScreen(viewModel = viewModel)
-                                MainScreen.SETTINGS -> SettingsScreen(viewModel = viewModel)
+                val authState by authViewModel.authState.collectAsState()
+                val currentScreen by chatViewModel.currentScreen.collectAsState()
+                val selectedChannelId by chatViewModel.channelId.collectAsState()
+
+                LaunchedEffect(authState) {
+                    when (authState) {
+                        AuthState.Authenticated -> MessageStreamService.start(this@MainActivity)
+                        AuthState.Unauthenticated -> MessageStreamService.stop(this@MainActivity)
+                        AuthState.AwaitingTotp -> {}
+                    }
+                }
+
+                LaunchedEffect(Unit) {
+                    intent.getIntExtra("channel_id", -1).takeIf { it != -1 }?.let {
+                        chatViewModel.switchChannel(it.toLong())
+                    }
+                }
+
+                if (authState == AuthState.Authenticated) {
+                    Scaffold(
+                        modifier = Modifier.fillMaxSize(),
+                        bottomBar = {
+                            // Only show bottom bar if we are NOT inside a specific chat channel
+                            if (selectedChannelId == null) {
+                                BottomDock(
+                                    currentScreen = currentScreen,
+                                    onNavigate = { chatViewModel.navigateTo(it) }
+                                )
+                            }
+                        }
+                    ) { innerPadding ->
+                        Box(modifier = Modifier.padding(innerPadding)) {
+                            when (currentScreen) {
+                                Screen.CHAT -> ChatScreen(
+                                    viewModel = chatViewModel,
+                                    onNavigateToSettings = { chatViewModel.navigateTo(Screen.SETTINGS) },
+                                    onLogout = { 
+                                        authViewModel.logout()
+                                        chatViewModel.clearChat()
+                                    }
+                                )
+                                Screen.CONTACTS -> ContactsScreen()
+                                Screen.SETTINGS -> SettingsScreen(
+                                    viewModel = settingsViewModel,
+                                    onLogout = {
+                                        authViewModel.logout()
+                                        chatViewModel.clearChat()
+                                    }
+                                )
                             }
-                        } else {
-                            AuthScreen(
-                                viewModel = viewModel,
-                                onSuccess = { }
-                            )
                         }
                     }
+                } else {
+                    AuthScreen(viewModel = authViewModel)
                 }
             }
         }
     }
+
+    override fun onResume() {
+        super.onResume()
+        AppState.isInForeground = true
+    }
+
+    override fun onPause() {
+        super.onPause()
+        AppState.isInForeground = false
+    }
+
+    override fun onNewIntent(intent: android.content.Intent) {
+        super.onNewIntent(intent)
+        intent.getIntExtra("channel_id", -1).takeIf { it != -1 }?.let { channelId ->
+            MessageStreamService.instance?.activeChannelId = channelId.toLong()
+        }
+    }
+}
+
+@Composable
+fun BottomDock(currentScreen: Screen, onNavigate: (Screen) -> Unit) {
+    NavigationBar(
+        containerColor = MaterialTheme.colorScheme.background,
+        tonalElevation = 0.dp,
+        modifier = Modifier
+            .height(80.dp)
+            .border(
+                0.5.dp, 
+                MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f), 
+                RoundedCornerShape(topStart = 0.dp, topEnd = 0.dp)
+            )
+    ) {
+        NavigationBarItem(
+            selected = currentScreen == Screen.CHAT,
+            onClick = { onNavigate(Screen.CHAT) },
+            icon = { Icon(Icons.Outlined.ChatBubbleOutline, contentDescription = "Chat") },
+            label = { Text("chat", style = MaterialTheme.typography.labelSmall) },
+            colors = NavigationBarItemDefaults.colors(
+                selectedIconColor = MaterialTheme.colorScheme.primary,
+                unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+                indicatorColor = Color.Transparent
+            )
+        )
+        NavigationBarItem(
+            selected = currentScreen == Screen.CONTACTS,
+            onClick = { onNavigate(Screen.CONTACTS) },
+            icon = { Icon(Icons.Outlined.PeopleOutline, contentDescription = "Contacts") },
+            label = { Text("contacts", style = MaterialTheme.typography.labelSmall) },
+            colors = NavigationBarItemDefaults.colors(
+                selectedIconColor = MaterialTheme.colorScheme.primary,
+                unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+                indicatorColor = Color.Transparent
+            )
+        )
+        NavigationBarItem(
+            selected = currentScreen == Screen.SETTINGS,
+            onClick = { onNavigate(Screen.SETTINGS) },
+            icon = { Icon(Icons.Outlined.Settings, contentDescription = "Settings") },
+            label = { Text("settings", style = MaterialTheme.typography.labelSmall) },
+            colors = NavigationBarItemDefaults.colors(
+                selectedIconColor = MaterialTheme.colorScheme.primary,
+                unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+                indicatorColor = Color.Transparent
+            )
+        )
+    }
 }

android/app/src/main/java/dev/zxq5/chatapp/android/ViewModelFactory.kt

@@ -0,0 +1,27 @@
+package dev.zxq5.chatapp.android
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import dev.zxq5.chatapp.android.data.repository.AuthRepository
+import dev.zxq5.chatapp.android.data.repository.ChatRepository
+import dev.zxq5.chatapp.android.data.repository.SettingsRepository
+import dev.zxq5.chatapp.android.feature.auth.AuthViewModel
+import dev.zxq5.chatapp.android.feature.chat.ChatViewModel
+import dev.zxq5.chatapp.android.feature.settings.SettingsViewModel
+
+class ViewModelFactory(private val repository: Any) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        return when {
+            modelClass.isAssignableFrom(AuthViewModel::class.java) -> {
+                AuthViewModel(repository as AuthRepository) as T
+            }
+            modelClass.isAssignableFrom(ChatViewModel::class.java) -> {
+                ChatViewModel(repository as ChatRepository) as T
+            }
+            modelClass.isAssignableFrom(SettingsViewModel::class.java) -> {
+                SettingsViewModel(repository as SettingsRepository) as T
+            }
+            else -> throw IllegalArgumentException("Unknown ViewModel class")
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/api/ApiClient.kt

@@ -1,361 +0,0 @@
-package dev.zxq5.chatapp.android.api
-
-import android.content.Context
-import android.util.Log
-import dev.zxq5.chatapp.android.core.data.TokenStore.getScopeFromToken
-import dev.zxq5.chatapp.android.model.LoginRequest
-import dev.zxq5.chatapp.android.model.LoginResponse
-import dev.zxq5.chatapp.android.model.Message
-import dev.zxq5.chatapp.android.model.SendMessage
-import dev.zxq5.chatapp.android.model.SignupRequest
-import io.ktor.client.HttpClient
-import io.ktor.client.call.body
-import io.ktor.client.engine.android.Android
-import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
-import io.ktor.client.request.get
-import io.ktor.client.request.post
-import io.ktor.client.request.delete
-import io.ktor.client.request.prepareGet
-import io.ktor.client.request.setBody
-import io.ktor.client.statement.bodyAsChannel
-import io.ktor.http.ContentType
-import io.ktor.http.contentType
-import io.ktor.http.isSuccess
-import io.ktor.serialization.kotlinx.json.json
-import io.ktor.utils.io.readUTF8Line
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.flow
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.json.Json
-
-import io.ktor.client.plugins.auth.Auth
-import io.ktor.client.plugins.auth.providers.BearerTokens
-import io.ktor.client.plugins.auth.providers.bearer
-import io.ktor.http.encodedPath
-import dev.zxq5.chatapp.android.core.BASE_URL
-import dev.zxq5.chatapp.android.core.data.TokenStore
-import dev.zxq5.chatapp.android.core.data.TokenStore.getUserIdFromToken
-import dev.zxq5.chatapp.android.core.error.ApiResult
-import kotlinx.serialization.KSerializer
-import kotlinx.serialization.descriptors.PrimitiveKind
-import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
-import kotlinx.serialization.descriptors.SerialDescriptor
-import kotlinx.serialization.encoding.Decoder
-import kotlinx.serialization.encoding.Encoder
-
-@Serializable
-data class QrResponse(val qr_code: String)
-
-@Serializable
-data class TOTPSixDigitCode(val code: String)
-
-@Serializable(with = TotpStatusSerializer::class)
-enum class TotpStatus {
-    ENABLED, DISABLED;
-    
-    val isEnabled: Boolean get() = this == ENABLED
-}
-
-object TotpStatusSerializer : KSerializer<TotpStatus> {
-    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("TotpStatus", PrimitiveKind.STRING)
-    override fun serialize(encoder: Encoder, value: TotpStatus) = encoder.encodeString(value.name.lowercase())
-    override fun deserialize(decoder: Decoder): TotpStatus = 
-        TotpStatus.valueOf(decoder.decodeString().uppercase())
-}
-
-@Serializable
-data class TotpStatusResponse(val status: TotpStatus)
-
-@Serializable
-data class PasswordChangeRequest(val old_password: String, val new_password: String)
-
-@Serializable
-data class DisplayNameRequest(val display_name: String?)
-
-object ApiClient {
-    private lateinit var appContext: Context
-
-    fun init(context: Context) {
-        appContext = context.applicationContext
-    }
-
-    fun hasToken(): Boolean {
-        return TokenStore.get(appContext) != null
-    }
-
-    fun getTokenScope(): String? {
-        val token = TokenStore.get(appContext) ?: return null
-        val scope = getScopeFromToken(token)
-        Log.d("Chat", "Current token scope: $scope")
-        return scope
-    }
-
-    fun getStoredUserId(): Int? {
-        return TokenStore.getUserId(appContext)
-    }
-
-    fun is2faEnabledLocal(): Boolean {
-        return TokenStore.is2faEnabled(appContext)
-    }
-
-    fun set2faEnabledLocal(enabled: Boolean) {
-        TokenStore.save2faEnabled(appContext, enabled)
-    }
-
-    private var _http: HttpClient? = null
-    val http: HttpClient
-        get() = synchronized(this) {
-            _http ?: createClient().also { _http = it }
-        }
-
-    private fun createClient(): HttpClient {
-        return HttpClient(Android) {
-            install(ContentNegotiation) {
-                json(Json { ignoreUnknownKeys = true })
-            }
-            install(Auth) {
-                bearer {
-                    loadTokens {
-                        val token = TokenStore.get(appContext) ?: return@loadTokens null
-                        Log.d("Chat", "Auth plugin loading token: ${getScopeFromToken(token)}")
-                        BearerTokens(token, "")
-                    }
-                    sendWithoutRequest { request ->
-                        val path = request.url.encodedPath
-                        !path.endsWith("/login") && !path.endsWith("/signup")
-                    }
-                }
-            }
-        }
-    }
-
-    private fun resetClient() {
-        Log.d("Chat", "Resetting HttpClient to refresh tokens")
-        _http?.close()
-        _http = null
-    }
-
-    suspend fun login(username: String, password: String): ApiResult<LoginResponse> {
-        return try {
-            val response = http.post("${BASE_URL}/api/login") {
-                contentType(ContentType.Application.Json)
-                setBody(LoginRequest(username, password))
-            }
-            if (response.status.isSuccess()) {
-                val body = response.body<LoginResponse>()
-                Log.d("Chat", "Login token scope: ${getScopeFromToken(body.token)}")
-                TokenStore.save(appContext, body.token)
-                resetClient()
-                ApiResult.Success(body)
-            } else {
-                ApiResult.HttpError(
-                    status = response.status.value,
-                    message = when (response.status.value) {
-                        401 -> "Invalid username or password"
-                        403 -> "Account suspended"
-                        429 -> "Too many attempts, please wait"
-                        else -> "Login failed (${response.status.value})"
-                    }
-                )
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Login network error", e)
-            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
-        }
-    }
-
-    suspend fun signup(username: String, email: String, password: String, token: String): ApiResult<LoginResponse> {
-        return try {
-            val response = http.post("${BASE_URL}/api/signup") {
-                contentType(ContentType.Application.Json)
-                setBody(SignupRequest(username = username, email = email, password = password, access_token = token))
-            }
-            if (response.status.isSuccess()) {
-                val body = response.body<LoginResponse>()
-                TokenStore.save(appContext, body.token)
-                resetClient()
-                ApiResult.Success(body)
-            } else {
-                ApiResult.HttpError(
-                    status = response.status.value,
-                    message = when (response.status.value) {
-                        401 -> "Invalid access token"
-                        else -> "Signup failed (${response.status.value})"
-                    }
-                )
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Signup error", e)
-            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
-        }
-    }
-
-    fun logout() {
-        TokenStore.clear(appContext)
-        resetClient()
-    }
-
-    suspend fun sendMessage(channelId: Int, text: String) {
-        val userId = TokenStore.getUserId(appContext) ?: return
-        http.post("${BASE_URL}/api/chat/$channelId") {
-            contentType(ContentType.Application.Json)
-            setBody(SendMessage(
-                user_id = userId,
-                text = text,
-                timestamp = System.currentTimeMillis()
-            ))
-        }
-    }
-
-    fun messageStream(channelId: Int): Flow<Message> = flow {
-        http.prepareGet("${BASE_URL}/api/events/$channelId").execute { response ->
-            val channel = response.bodyAsChannel()
-            while (!channel.isClosedForRead) {
-                val line = channel.readUTF8Line(256) ?: break
-                if (line.startsWith("data:")) {
-                    val json = line.removePrefix("data:").trim()
-                    runCatching { Json.decodeFromString<Message>(json) }
-                        .onSuccess { emit(it) }
-                }
-            }
-        }
-    }
-
-    suspend fun getTotpQr(): QrResponse? {
-        return try {
-            http.get("${BASE_URL}/api/totp.jpg").body<QrResponse>()
-        } catch (e: Exception) {
-            Log.e("Chat", "Error fetching TOTP QR", e)
-            null
-        }
-    }
-
-    suspend fun confirmTotp(code: String): Boolean {
-        return try {
-            val response = http.post("${BASE_URL}/api/totp") {
-                contentType(ContentType.Application.Json)
-                setBody(TOTPSixDigitCode(code))
-            }
-            if (response.status.isSuccess()) {
-                // If confirming TOTP returns a new token (e.g. from partial to full), we should save it
-                // Assuming confirm might return a LoginResponse if it upgrades the session
-                runCatching {
-                    val body = response.body<LoginResponse>()
-                    TokenStore.save(appContext, body.token)
-                    resetClient()
-                }
-                set2faEnabledLocal(true)
-                true
-            } else {
-                false
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Error confirming TOTP", e)
-            false
-        }
-    }
-
-    suspend fun verifyTotpLogin(code: String): ApiResult<LoginResponse> {
-        return try {
-            val response = http.post("${BASE_URL}/api/totp/verify") {
-                contentType(ContentType.Application.Json)
-                setBody(TOTPSixDigitCode(code))
-            }
-            if (response.status.isSuccess()) {
-                val body = response.body<LoginResponse>()
-
-                val tok = body.token;
-                Log.d("Chat", "UID ${getUserIdFromToken(tok)}");
-                Log.d("Chat", "Token ${getScopeFromToken(tok)}");
-
-                TokenStore.save(appContext, body.token)
-                resetClient()
-                ApiResult.Success(body)
-            } else {
-                val errorText = try { response.body<String>() } catch (e: Exception) { "Unknown error" }
-                Log.e("Chat", "TOTP verify failed: ${response.status.value} - $errorText")
-                ApiResult.HttpError(
-                    status = response.status.value,
-                    message = when (response.status.value) {
-                        401 -> "Incorrect code, please try again"
-                        403 -> "Session expired, please log in again"
-                        429 -> "Too many attempts, please wait"
-                        else -> "Verification failed (${response.status.value})"
-                    }
-                )
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "TOTP verify network error", e)
-            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
-        }
-    }
-
-    suspend fun getTotpStatus(): Boolean {
-        return try {
-            val response = http.get("${BASE_URL}/api/totp/status")
-            if (response.status.isSuccess()) {
-                val status = response.body<TotpStatus>()
-                val enabled = status.isEnabled
-                set2faEnabledLocal(enabled)
-                enabled
-            } else {
-                is2faEnabledLocal()
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Error getting TOTP status", e)
-            is2faEnabledLocal()
-        }
-    }
-
-    suspend fun disableTotp(): ApiResult<LoginResponse> {
-        return try {
-            val response = http.delete("${BASE_URL}/api/totp")
-            if (response.status.isSuccess()) {
-                val body = response.body<LoginResponse>()
-                TokenStore.save(appContext, body.token)
-                set2faEnabledLocal(false)
-                resetClient()
-                ApiResult.Success(body)
-            } else {
-                ApiResult.HttpError(response.status.value, "Failed to disable TOTP")
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Error disabling TOTP", e)
-            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
-        }
-    }
-
-    suspend fun changePassword(old: String, new: String): ApiResult<Unit> {
-        return try {
-            val response = http.post("${BASE_URL}/api/settings/password") {
-                contentType(ContentType.Application.Json)
-                setBody(PasswordChangeRequest(old, new))
-            }
-            if (response.status.isSuccess()) {
-                ApiResult.Success(Unit)
-            } else {
-                ApiResult.HttpError(
-                    response.status.value,
-                    if (response.status.value == 401) "Old password is wrong" else "Password change failed"
-                )
-            }
-        } catch (e: Exception) {
-            Log.e("Chat", "Error changing password", e)
-            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
-        }
-    }
-
-    suspend fun updateDisplayName(name: String?): Boolean {
-        return try {
-            val response = http.post("${BASE_URL}/api/settings/display_name") {
-                contentType(ContentType.Application.Json)
-                setBody(DisplayNameRequest(name))
-            }
-            response.status.isSuccess()
-        } catch (e: Exception) {
-            Log.e("Chat", "Error updating display name", e)
-            false
-        }
-    }
-}
-

android/app/src/main/java/dev/zxq5/chatapp/android/api/AuthClient.kt

@@ -0,0 +1,117 @@
+package dev.zxq5.chatapp.android.api
+
+import android.util.Log
+import dev.zxq5.chatapp.android.BuildConfig
+import dev.zxq5.chatapp.android.BuildConfig.BASE_URL
+import dev.zxq5.chatapp.android.api.model.LoginRequest
+import dev.zxq5.chatapp.android.api.model.LoginResponse
+import dev.zxq5.chatapp.android.api.model.TOTPSixDigitCode
+import dev.zxq5.chatapp.android.core.error.ApiResult
+import dev.zxq5.chatapp.android.api.model.SignupRequest
+import io.ktor.client.HttpClient
+import io.ktor.client.call.body
+import io.ktor.client.engine.android.Android
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.request.header
+import io.ktor.client.request.post
+import io.ktor.client.request.setBody
+import io.ktor.http.ContentType
+import io.ktor.http.HttpHeaders
+import io.ktor.http.contentType
+import io.ktor.http.isSuccess
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.serialization.json.Json
+
+/**
+ * Client for unauthenticated and pre-authenticated (2FA) requests.
+ */
+object AuthClient {
+    private val http = HttpClient(Android) {
+        install(ContentNegotiation) {
+            json(Json { ignoreUnknownKeys = true })
+        }
+    }
+
+    suspend fun login(username: String, password: String): ApiResult<LoginResponse> {
+        return try {
+            val response = http.post("${BASE_URL}/api/login") {
+                contentType(ContentType.Application.Json)
+                setBody(LoginRequest(username, password))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(response.body<LoginResponse>())
+            } else {
+                ApiResult.HttpError(
+                    status = response.status.value,
+                    message = when (response.status.value) {
+                        401 -> "Invalid username or password"
+                        403 -> "Account suspended"
+                        429 -> "Too many attempts, please wait"
+                        else -> "Login failed (${response.status.value})"
+                    }
+                )
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Login network error", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun signup(username: String, email: String, password: String, token: String): ApiResult<LoginResponse> {
+        return try {
+            val response = http.post("${BASE_URL}/api/signup") {
+                contentType(ContentType.Application.Json)
+                setBody(
+                    SignupRequest(
+                        username = username,
+                        email = email,
+                        password = password,
+                        access_token = token
+                    )
+                )
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(response.body<LoginResponse>())
+            } else {
+                ApiResult.HttpError(
+                    status = response.status.value,
+                    message = when (response.status.value) {
+                        401 -> "Invalid access token"
+                        else -> "Signup failed (${response.status.value})"
+                    }
+                )
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Signup error", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun verifyTotpLogin(partialToken: String, code: String): ApiResult<LoginResponse> {
+        return try {
+            val response = http.post("${BASE_URL}/api/totp/verify") {
+                header(HttpHeaders.Authorization, "Bearer $partialToken")
+                contentType(ContentType.Application.Json)
+                setBody(TOTPSixDigitCode(code))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(response.body<LoginResponse>())
+            } else {
+                val errorText = try { response.body<String>() } catch (e: Exception) { "Unknown error" }
+                Log.e("Chat", "TOTP verify failed: ${response.status.value} - $errorText")
+                ApiResult.HttpError(
+                    status = response.status.value,
+                    message = when (response.status.value) {
+                        401 -> "Incorrect code, please try again"
+                        403 -> "Session expired, please log in again"
+                        429 -> "Too many attempts, please wait"
+                        else -> "Verification failed (${response.status.value})"
+                    }
+                )
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "TOTP verify network error", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/api/ChatClient.kt

@@ -0,0 +1,65 @@
+package dev.zxq5.chatapp.android.api
+
+import dev.zxq5.chatapp.android.BuildConfig.BASE_URL
+import dev.zxq5.chatapp.android.api.model.Message
+import dev.zxq5.chatapp.android.api.model.SendMessage
+import dev.zxq5.chatapp.android.api.model.SpaceDto
+import io.ktor.client.HttpClient
+import io.ktor.client.call.body
+import io.ktor.client.engine.android.Android
+import io.ktor.client.plugins.auth.Auth
+import io.ktor.client.plugins.auth.providers.BearerTokens
+import io.ktor.client.plugins.auth.providers.bearer
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.request.get
+import io.ktor.client.request.post
+import io.ktor.client.request.prepareGet
+import io.ktor.client.request.setBody
+import io.ktor.client.statement.bodyAsChannel
+import io.ktor.http.ContentType
+import io.ktor.http.contentType
+import io.ktor.serialization.kotlinx.json.json
+import io.ktor.utils.io.readLine
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.serialization.json.Json
+import kotlin.time.Clock
+import kotlin.time.ExperimentalTime
+
+class ChatClient(private val token: String) {
+
+    private val http = HttpClient(Android) {
+        install(ContentNegotiation) {
+            json(Json { ignoreUnknownKeys = true })
+        }
+        install(Auth) {
+            bearer {
+                loadTokens { BearerTokens(token, "") }
+            }
+        }
+    }
+
+    suspend fun getAccessibleChannels(): List<SpaceDto> = http.get("${BASE_URL}/api/accessible_channels").body()
+
+    @OptIn(ExperimentalTime::class)
+    suspend fun sendMessage(channelId: Long, userId: Int, text: String) {
+        http.post("${BASE_URL}/api/chat/$channelId") {
+            contentType(ContentType.Application.Json)
+            setBody(SendMessage(user_id = userId, text = text, timestamp = Clock.System.now()))
+        }
+    }
+
+    fun messageStream(channelId: Long): Flow<Message> = flow {
+        http.prepareGet("${BASE_URL}/api/events/$channelId").execute { response ->
+            val channel = response.bodyAsChannel()
+            while (!channel.isClosedForRead) {
+                val line = channel.readLine() ?: break
+                if (line.startsWith("data:")) {
+                    val json = line.removePrefix("data:").trim()
+                    runCatching { Json.decodeFromString<Message>(json) }
+                        .onSuccess { emit(it) }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/api/SettingsClient.kt

@@ -0,0 +1,171 @@
+package dev.zxq5.chatapp.android.api
+
+import android.util.Log
+import dev.zxq5.chatapp.android.BuildConfig.BASE_URL
+import dev.zxq5.chatapp.android.api.model.AccountDeleteRequest
+import dev.zxq5.chatapp.android.api.model.DisplayNameRequest
+import dev.zxq5.chatapp.android.api.model.PasswordChangeRequest
+import dev.zxq5.chatapp.android.api.model.QrResponse
+import dev.zxq5.chatapp.android.api.model.TOTPSixDigitCode
+import dev.zxq5.chatapp.android.api.model.TotpStatus
+import dev.zxq5.chatapp.android.api.model.UsernameRequest
+import dev.zxq5.chatapp.android.api.model.TotpDeleteRequest
+import dev.zxq5.chatapp.android.api.model.PasswordRequest
+import dev.zxq5.chatapp.android.core.error.ApiResult
+import io.ktor.client.HttpClient
+import io.ktor.client.call.body
+import io.ktor.client.engine.android.Android
+import io.ktor.client.plugins.auth.Auth
+import io.ktor.client.plugins.auth.providers.BearerTokens
+import io.ktor.client.plugins.auth.providers.bearer
+import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.client.request.delete
+import io.ktor.client.request.get
+import io.ktor.client.request.patch
+import io.ktor.client.request.post
+import io.ktor.client.request.setBody
+import io.ktor.http.ContentType
+import io.ktor.http.contentType
+import io.ktor.http.isSuccess
+import io.ktor.serialization.kotlinx.json.json
+import kotlinx.serialization.json.Json
+
+/**
+ * Client for account settings and TOTP management.
+ */
+class SettingsClient(private val token: String) {
+    private val http = HttpClient(Android) {
+        install(ContentNegotiation) {
+            json(Json { ignoreUnknownKeys = true })
+        }
+        install(Auth) {
+            bearer {
+                loadTokens { BearerTokens(token, "") }
+            }
+        }
+    }
+
+    suspend fun getTotpQr(password: String): ApiResult<QrResponse> {
+        return try {
+            val response = http.post("${BASE_URL}/api/totp.jpg") {
+                contentType(ContentType.Application.Json)
+                setBody(PasswordRequest(password))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(response.body<QrResponse>())
+            } else {
+                ApiResult.HttpError(response.status.value, "Failed to get QR code")
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Error fetching TOTP QR", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun confirmTotp(code: String): ApiResult<Unit> {
+        return try {
+            val response = http.post("${BASE_URL}/api/totp") {
+                contentType(ContentType.Application.Json)
+                setBody(TOTPSixDigitCode(code))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(Unit)
+            } else {
+                ApiResult.HttpError(response.status.value, "Failed to confirm TOTP")
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Error confirming TOTP", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun getTotpStatus(): ApiResult<TotpStatus> {
+        return try {
+            val response = http.get("${BASE_URL}/api/totp/status")
+            if (response.status.isSuccess()) {
+                ApiResult.Success(response.body<TotpStatus>())
+            } else {
+                ApiResult.HttpError(response.status.value, "Failed to get TOTP status")
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Error getting TOTP status", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun disableTotp(password: String, totpCode: String): ApiResult<Unit> {
+        return try {
+            val response = http.delete("${BASE_URL}/api/totp") {
+                contentType(ContentType.Application.Json)
+                setBody(TotpDeleteRequest(password, totpCode))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(Unit)
+            } else {
+                ApiResult.HttpError(response.status.value, "Failed to disable TOTP")
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Error disabling TOTP", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun changePassword(old: String, new: String): ApiResult<Unit> {
+        return try {
+            val response = http.post("${BASE_URL}/api/settings/password") {
+                contentType(ContentType.Application.Json)
+                setBody(PasswordChangeRequest(old, new))
+            }
+            if (response.status.isSuccess()) {
+                ApiResult.Success(Unit)
+            } else {
+                ApiResult.HttpError(
+                    response.status.value,
+                    if (response.status.value == 401) "Old password is wrong" else "Password change failed"
+                )
+            }
+        } catch (e: Exception) {
+            Log.e("Chat", "Error changing password", e)
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun updateDisplayName(name: String?): Boolean {
+        return try {
+            val response = http.patch("${BASE_URL}/api/settings/display_name") {
+                contentType(ContentType.Application.Json)
+                setBody(DisplayNameRequest(name))
+            }
+            response.status.isSuccess()
+        } catch (e: Exception) {
+            Log.e("Chat", "Error updating display name", e)
+            false
+        }
+    }
+
+    suspend fun updateUsername(username: String): ApiResult<Unit> {
+        return try {
+            val response = http.patch("${BASE_URL}/api/settings/username") {
+                contentType(ContentType.Application.Json)
+                setBody(UsernameRequest(username))
+            }
+            if (response.status.isSuccess()) ApiResult.Success(Unit)
+            else ApiResult.HttpError(response.status.value, "Failed to update username")
+        } catch (e: Exception) {
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+
+    suspend fun deleteAccount(password: String, totpCode: String?): ApiResult<Unit> {
+        return try {
+            val response = http.delete("${BASE_URL}/api/settings") {
+                contentType(ContentType.Application.Json)
+                setBody(AccountDeleteRequest(password, totpCode))
+            }
+            if (response.status.isSuccess()) ApiResult.Success(Unit)
+            else ApiResult.HttpError(response.status.value, "Failed to delete account")
+        } catch (e: Exception) {
+            ApiResult.NetworkError(e.localizedMessage ?: "Network error")
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/AccountDeleteRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class AccountDeleteRequest(val password: String, val totp_code: String? = null)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/Channel.kt

@@ -0,0 +1,15 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
+
+@Serializable
+data class Channel @OptIn(ExperimentalTime::class) constructor(
+    val id: Long,
+    val name: String,
+    val description: String? = null,
+    val space_id: Long,
+    val created_at: Instant,
+    val updated_at: Instant
+)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/DisplayNameRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class DisplayNameRequest(val display_name: String?)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/LoginRequest.kt

@@ -1,4 +1,4 @@
-package dev.zxq5.chatapp.android.model
+package dev.zxq5.chatapp.android.api.model
 
 import kotlinx.serialization.Serializable
 
@@ -7,5 +7,3 @@ data class LoginRequest(
     val username: String,
     val password: String
 )
-
-

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/LoginResponse.kt

@@ -1,4 +1,4 @@
-package dev.zxq5.chatapp.android.model
+package dev.zxq5.chatapp.android.api.model
 
 import kotlinx.serialization.Serializable
 

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/Message.kt

@@ -0,0 +1,13 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
+
+@Serializable
+data class Message @OptIn(ExperimentalTime::class) constructor(
+    val user_id: Int,
+    val display_name: String,
+    val text: String,
+    val timestamp: Instant
+)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/PasswordChangeRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PasswordChangeRequest(val old_password: String, val new_password: String)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/PasswordRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class PasswordRequest(val password: String)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/QrResponse.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class QrResponse(val qr_code: String)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/SendMessage.kt

@@ -0,0 +1,12 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
+
+@Serializable
+data class SendMessage @OptIn(ExperimentalTime::class) constructor(
+    val user_id: Int,
+    val text: String,
+    val timestamp: Instant
+)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/SignupRequest.kt

@@ -1,4 +1,4 @@
-package dev.zxq5.chatapp.android.model
+package dev.zxq5.chatapp.android.api.model
 
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/Space.kt

@@ -0,0 +1,28 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
+
+
+@Serializable
+data class Space @OptIn(ExperimentalTime::class) constructor(
+    val id: Long,
+    val name: String,
+    val description: String? = null,
+    val owner_id: Long,
+    val created_at: Instant,
+    val updated_at: Instant
+)
+
+@Serializable
+data class SpaceDto @OptIn(ExperimentalTime::class) constructor(
+    val channels: List<Channel>,
+
+    val id: Long,
+    val name: String,
+    val description: String? = null,
+    val owner_id: Long,
+    val created_at: Instant,
+    val updated_at: Instant
+)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/TOTPSixDigitCode.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class TOTPSixDigitCode(val code: String)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/TotpDeleteRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class TotpDeleteRequest(val password: String, val totp_code: String)

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/TotpStatus.kt

@@ -0,0 +1,24 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+
+@Serializable(with = TotpStatus.TotpStatusSerializer::class)
+enum class TotpStatus {
+    ENABLED, DISABLED;
+    val isEnabled: Boolean get() = this == ENABLED
+
+
+    companion object TotpStatusSerializer : KSerializer<TotpStatus> {
+        override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("TotpStatus", PrimitiveKind.STRING)
+        override fun serialize(encoder: Encoder, value: TotpStatus) = encoder.encodeString(value.name.lowercase())
+        override fun deserialize(decoder: Decoder): TotpStatus =
+            TotpStatus.valueOf(decoder.decodeString().uppercase())
+    }
+}
+

android/app/src/main/java/dev/zxq5/chatapp/android/api/model/UsernameRequest.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.api.model
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UsernameRequest(val username: String)

android/app/src/main/java/dev/zxq5/chatapp/android/core/constants.kt

@@ -1,3 +1,3 @@
 package dev.zxq5.chatapp.android.core
 
-const val BASE_URL = "http://zxq5-x1:8000"
+//const val BASE_URL = "http://zxq5-x1:8000"

android/app/src/main/java/dev/zxq5/chatapp/android/core/data/TokenStore.kt

@@ -8,12 +8,14 @@ import androidx.security.crypto.EncryptedSharedPreferences
 import androidx.security.crypto.MasterKey
 import org.json.JSONObject
 
-// In your ApiClient or a dedicated TokenStore
-object TokenStore {
-    private const val KEY = "auth_token"
-    private const val TWOFA_KEY = "twofa_enabled"
+private const val KEY = "auth_token"
+private const val TWOFA_KEY = "twofa_enabled"
 
-    private fun prefs(context: Context): SharedPreferences {
+// In your ChatClient.kt or a dedicated TokenStore
+class TokenStore(appContext: Context) {
+    private val context = appContext.applicationContext;
+
+    private fun prefs(): SharedPreferences {
         return EncryptedSharedPreferences.create(
             context,
             "secure_prefs",
@@ -25,54 +27,54 @@ object TokenStore {
         )
     }
 
-    fun save(context: Context, token: String) =
-        prefs(context).edit { putString(KEY, token) }
+    fun save(token: String) =
+        prefs().edit { putString(KEY, token) }
 
-    fun get(context: Context): String? =
-        prefs(context).getString(KEY, null)
+    fun get(): String? =
+        prefs().getString(KEY, null)
 
-    fun save2faEnabled(context: Context, enabled: Boolean) =
-        prefs(context).edit { putBoolean(TWOFA_KEY, enabled) }
+    fun save2faEnabled( enabled: Boolean) =
+        prefs().edit { putBoolean(TWOFA_KEY, enabled) }
 
-    fun is2faEnabled(context: Context): Boolean =
-        prefs(context).getBoolean(TWOFA_KEY, false)
+    fun is2faEnabled(): Boolean =
+        prefs().getBoolean(TWOFA_KEY, false)
 
-    fun clear(context: Context) =
-        prefs(context).edit { remove(KEY).remove(TWOFA_KEY) }
+    fun clear() =
+        prefs().edit { remove(KEY).remove(TWOFA_KEY) }
 
-    fun getUserId(context: Context): Int? {
-        val token = get(context) ?: return null
+    fun getUserId(): Int? {
+        val token = get() ?: return null
         return getUserIdFromToken(token)
     }
+}
 
-    fun getUserIdFromToken(token: String): Int? {
-        return try {
-            val payload = token.split(".")[1]
-            // base64url needs padding restored
-            val padded = payload + "==".take((4 - payload.length % 4) % 4)
-            val jsonString = String(Base64.decode(padded, Base64.URL_SAFE))
-            val json = JSONObject(jsonString)
+fun getUserIdFromToken(token: String): Int? {
+    return try {
+        val payload = token.split(".")[1]
+        // base64url needs padding restored
+        val padded = payload + "==".take((4 - payload.length % 4) % 4)
+        val jsonString = String(Base64.decode(padded, Base64.URL_SAFE))
+        val json = JSONObject(jsonString)
 
-            // Handle both standard 'sub' and custom 'user_id'
-            when {
-                json.has("sub") -> json.getInt("sub")
-                json.has("user_id") -> json.getInt("user_id")
-                else -> null
-            }
-        } catch (e: Exception) {
-            null
-        }
-    }
-
-    fun getScopeFromToken(token: String): String? {
-        return try {
-            val payload = token.split(".")[1]
-            val padded = payload + "==".take((4 - payload.length % 4) % 4)
-            val jsonString = String(Base64.decode(padded, Base64.URL_SAFE))
-            val json = JSONObject(jsonString)
-            if (json.has("scope")) json.getString("scope") else null
-        } catch (e: Exception) {
-            null
+        // Handle both standard 'sub' and custom 'user_id'
+        when {
+            json.has("sub") -> json.getInt("sub")
+            json.has("user_id") -> json.getInt("user_id")
+            else -> null
         }
+    } catch (e: Exception) {
+        null
+    }
+}
+
+fun getScopeFromToken(token: String): String? {
+    return try {
+        val payload = token.split(".")[1]
+        val padded = payload + "==".take((4 - payload.length % 4) % 4)
+        val jsonString = String(Base64.decode(padded, Base64.URL_SAFE))
+        val json = JSONObject(jsonString)
+        if (json.has("scope")) json.getString("scope") else null
+    } catch (e: Exception) {
+        null
     }
 }

android/app/src/main/java/dev/zxq5/chatapp/android/core/service/MessageStreamService.kt

@@ -0,0 +1,104 @@
+package dev.zxq5.chatapp.android.core.service
+
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import android.util.Log
+import dev.zxq5.chatapp.android.ChatApplication
+import dev.zxq5.chatapp.android.data.repository.ChatRepository
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.launch
+
+// core/service/MessageStreamService.kt
+class MessageStreamService : Service() {
+
+    private val serviceScope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
+    private lateinit var notificationService: NotificationService
+    private lateinit var chatRepository: ChatRepository
+
+    // which channel the user is currently looking at
+    // set by the ViewModel when the user opens/closes a channel
+    var activeChannelId: Long? = null
+        set(value) {
+            field = value
+            Log.d("Service", "activeChannelId set to $value")
+            if (value != null) {
+                // restart stream with new channel
+                currentStreamJob?.cancel()
+                observeMessages()
+            }
+        }
+
+    private var currentStreamJob: kotlinx.coroutines.Job? = null
+
+    companion object {
+        var instance: MessageStreamService? = null
+
+        fun start(context: Context) {
+            val intent = Intent(context, MessageStreamService::class.java)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                context.startForegroundService(intent)
+            } else {
+                context.startService(intent)
+            }
+        }
+
+        fun stop(context: Context) {
+            context.stopService(Intent(context, MessageStreamService::class.java))
+        }
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        instance = this
+        notificationService = NotificationService(this)
+        chatRepository = (application as ChatApplication).chatRepository
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        startForeground(
+            NotificationService.FOREGROUND_NOTIFICATION_ID,
+            notificationService.buildForegroundNotification()
+        )
+        observeMessages()
+        return START_STICKY  // restart if killed
+    }
+
+    private fun observeMessages() {
+        val channelId = activeChannelId ?: chatRepository.getLastActiveChannel()
+        Log.d("Service", "observeMessages called, channelId=$channelId")
+        if (channelId == null) {
+            Log.d("Service", "No channel to observe, waiting for switchChannel")
+            return
+        }
+
+        Log.d("Service", "Starting stream for channel $channelId")
+        currentStreamJob = serviceScope.launch {
+            chatRepository.messageStream(channelId)
+                .catch { e -> Log.e("Service", "Stream error", e) }
+                .collect { message ->
+                    if (!ChatApplication.AppState.isInForeground) {  // no channel focused, always notify
+                        notificationService.showMessageNotification(
+                            conversationId = activeChannelId.toString(),
+                            senderName = message.display_name,
+                            messagePreview = message.text.take(80)
+                        )
+                    }
+                }
+        }
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    override fun onDestroy() {
+        super.onDestroy()
+        instance = null
+        serviceScope.cancel()
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/core/service/NotificationService.kt

@@ -0,0 +1,94 @@
+package dev.zxq5.chatapp.android.core.service
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import androidx.core.app.NotificationCompat
+import dev.zxq5.chatapp.android.MainActivity
+import dev.zxq5.chatapp.android.R
+
+class NotificationService(private val context: Context) {
+
+    companion object {
+        const val CHANNEL_ID = "messages"
+        const val FOREGROUND_NOTIFICATION_ID = 1  // ← this needs to exist
+    }
+
+    private val manager = context.getSystemService(NotificationManager::class.java)
+
+    fun createChannels() {
+        // channel for new message notifications
+        val messageChannel = NotificationChannel(
+            CHANNEL_ID,
+            "Messages",
+            NotificationManager.IMPORTANCE_HIGH
+        ).apply {
+            enableVibration(true)
+        }
+
+        // channel for the persistent foreground service notification
+        // low importance so it doesn't make noise
+        val serviceChannel = NotificationChannel(
+            "service",
+            "Background connection",
+            NotificationManager.IMPORTANCE_LOW
+        )
+
+        val mgr = context.getSystemService(NotificationManager::class.java)
+        mgr.createNotificationChannel(messageChannel)
+        mgr.createNotificationChannel(serviceChannel)
+    }
+
+    fun buildForegroundNotification(): Notification {
+        return NotificationCompat.Builder(context, "service")
+            .setSmallIcon(R.drawable.ic_notification)
+            .setContentTitle("chatapp")
+            .setContentText("Connected")
+            .setOngoing(true)
+            .setSilent(true)
+            .build()
+    }
+
+    fun showMessageNotification(
+        conversationId: String,
+        senderName: String,
+        messagePreview: String,   // for E2E this would be "New message" — no plaintext
+        notificationId: Int = conversationId.hashCode()
+    ) {
+        // intent that opens the app to the right conversation when tapped
+        val intent = Intent(context, MainActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_SINGLE_TOP
+            putExtra("conversation_id", conversationId)
+        }
+
+        val pendingIntent = PendingIntent.getActivity(
+            context,
+            notificationId,
+            intent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+
+        val notification = NotificationCompat.Builder(context, "messages")
+            .setSmallIcon(R.drawable.ic_notification)
+            .setContentTitle(senderName)
+            .setContentText(messagePreview)
+            .setPriority(NotificationCompat.PRIORITY_HIGH)
+            .setContentIntent(pendingIntent)
+            .setAutoCancel(true)         // dismiss on tap
+            .build()
+
+        manager.notify(notificationId, notification)
+    }
+
+    fun dismissNotification(conversationId: String) {
+        manager.cancel(conversationId.hashCode())
+    }
+
+    fun dismissAll() {
+        manager.cancelAll()
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/data/repository/AuthRepository.kt

@@ -1,31 +1,79 @@
 package dev.zxq5.chatapp.android.data.repository
 
-import dev.zxq5.chatapp.android.api.ApiClient
+import dev.zxq5.chatapp.android.api.AuthClient
 import dev.zxq5.chatapp.android.core.data.TokenStore
+import dev.zxq5.chatapp.android.core.data.getScopeFromToken
 import dev.zxq5.chatapp.android.core.error.ApiResult
-//
-//class AuthRepository(
-//    private val apiClient: ApiClient,
-//    private val tokenStore: TokenStore,
-//) {
-//
-//    suspend fun login(username: String, password: String): LoginResult {
-////        return when(val result = apiClient.login(username, password)) {
-////            is ApiResult.Success -> {
-////                tokenStore.save(context = context, result.data.token);
-////            }
-////        }
-//    }
-//}
+import dev.zxq5.chatapp.android.feature.auth.TokenScope
 
+class AuthRepository(
+    private val tokenStore: TokenStore,
+) {
+    suspend fun signup(username: String, email: String, password: String, accessToken: String): SignupResult {
+        return when(val result = AuthClient.signup(username, email, password, accessToken)) {
+            is ApiResult.HttpError -> SignupResult.Error(result.message)
+            is ApiResult.NetworkError -> SignupResult.Error("Network error: ${result.message}")
+            is ApiResult.Success -> {
+                tokenStore.save(result.data.token)
+                SignupResult.Success
+            }
+        }
+    }
 
+    suspend fun verifyTotpLogin(code: String): LoginResult {
+        val partialToken = tokenStore.get() ?: return LoginResult.Error("Session expired")
+        return when(val result = AuthClient.verifyTotpLogin(partialToken, code)) {
+            is ApiResult.HttpError -> LoginResult.TotpError(result.message)
+            is ApiResult.NetworkError -> LoginResult.TotpError("Network error: ${result.message}")
+            is ApiResult.Success -> {
+                tokenStore.save(result.data.token)
+                LoginResult.Success
+            }
+        }
+    }
 
+    suspend fun login(username: String, password: String): LoginResult {
+        return when(val result = AuthClient.login(username, password)) {
+            is ApiResult.HttpError -> LoginResult.Error(result.message)
+            is ApiResult.NetworkError -> LoginResult.Error("Network error: ${result.message}")
+            is ApiResult.Success -> {
+                tokenStore.save(result.data.token)
+
+                when (val scope = getScopeFromToken(result.data.token)) {
+                    TokenScope.TOTP_PENDING -> LoginResult.TotpRequired
+                    TokenScope.FULL -> LoginResult.Success
+                    else -> LoginResult.Error("Unexpected token scope: $scope")
+                }
+            }
+       }
+    }
+
+    fun logout() {
+        tokenStore.clear()
+    }
+    
+    fun getUserId() = tokenStore.getUserId()
+
+    fun getAuthState(): AuthState {
+        val token = tokenStore.get() ?: return AuthState.Unauthenticated
+        return when (getScopeFromToken(token)) {
+            TokenScope.FULL -> AuthState.Authenticated
+            TokenScope.TOTP_PENDING -> AuthState.AwaitingTotp
+            else -> AuthState.Unauthenticated
+        }
+    }
+}
+
+sealed class SignupResult {
+    object Success : SignupResult()
+    data class Error(val message: String) : SignupResult()
+}
 
 sealed class LoginResult {
     object Success : LoginResult()
-    object TotpRequired : LoginResult()           // step 1 outcome → go to totp screen
-    data class TotpError(val message: String) : LoginResult()  // step 2 failure → stay on totp screen, show error
-    data class Error(val message: String) : LoginResult()      // general failure → show on login form
+    object TotpRequired : LoginResult()
+    data class TotpError(val message: String) : LoginResult()
+    data class Error(val message: String) : LoginResult()
 }
 
 sealed class AuthState {

android/app/src/main/java/dev/zxq5/chatapp/android/data/repository/ChatRepository.kt

@@ -0,0 +1,50 @@
+package dev.zxq5.chatapp.android.data.repository
+
+import dev.zxq5.chatapp.android.api.ChatClient
+import dev.zxq5.chatapp.android.core.data.TokenStore
+import dev.zxq5.chatapp.android.api.model.Message
+import dev.zxq5.chatapp.android.api.model.SpaceDto
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.emptyFlow
+
+class ChatRepository(private val tokenStore: TokenStore) {
+    
+    private var _chatClient: ChatClient? = null
+    private var _lastToken: String? = null
+
+    private var _lastActiveChannel: Long? = null
+
+    private fun getChatClient(): ChatClient? {
+        val token = tokenStore.get() ?: return null
+        if (_chatClient == null || token != _lastToken) {
+            _chatClient = ChatClient(token)
+            _lastToken = token
+        }
+        return _chatClient
+    }
+
+    fun resetClient() {
+        _chatClient = null
+        _lastToken = null
+    }
+
+    fun getLastActiveChannel(): Long? {
+        return _lastActiveChannel
+    }
+
+    fun getUserId() = tokenStore.getUserId()
+
+    suspend fun getAccessibleChannels(): List<SpaceDto> {
+        return getChatClient()?.getAccessibleChannels() ?: emptyList()
+    }
+
+    suspend fun sendMessage(channelId: Long, text: String) {
+        val userId = tokenStore.getUserId() ?: return
+        getChatClient()?.sendMessage(channelId, userId, text)
+    }
+
+    fun messageStream(channelId: Long): Flow<Message> {
+        _lastActiveChannel = channelId
+        return getChatClient()?.messageStream(channelId) ?: emptyFlow()
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/data/repository/SettingsRepository.kt

@@ -0,0 +1,67 @@
+package dev.zxq5.chatapp.android.data.repository
+
+import dev.zxq5.chatapp.android.api.model.QrResponse
+import dev.zxq5.chatapp.android.api.SettingsClient
+import dev.zxq5.chatapp.android.api.model.TotpStatus
+import dev.zxq5.chatapp.android.core.data.TokenStore
+import dev.zxq5.chatapp.android.core.error.ApiResult
+
+class SettingsRepository(private val tokenStore: TokenStore) {
+
+    private var _settingsClient: SettingsClient? = null
+    private var _lastToken: String? = null
+
+    private fun getSettingsClient(): SettingsClient? {
+        val token = tokenStore.get() ?: return null
+        if (_settingsClient == null || token != _lastToken) {
+            _settingsClient = SettingsClient(token)
+            _lastToken = token
+        }
+        return _settingsClient
+    }
+
+    fun resetClient() {
+        _settingsClient = null
+        _lastToken = null
+    }
+
+    suspend fun getTotpQr(password: String): ApiResult<QrResponse?> {
+        val settingsClient = getSettingsClient() ?: return ApiResult.NetworkError("Not authenticated")
+        return settingsClient.getTotpQr(password)
+    }
+
+    suspend fun confirmTotp(code: String): ApiResult<Unit> {
+        val client = getSettingsClient() ?: return ApiResult.NetworkError("Not authenticated")
+        return client.confirmTotp(code)
+    }
+
+    suspend fun getTotpStatus(): ApiResult<TotpStatus> {
+        return getSettingsClient()?.getTotpStatus() ?: ApiResult.NetworkError("Not authenticated")
+    }
+
+    suspend fun disableTotp(password: String, totpCode: String): ApiResult<Unit> {
+        val client = getSettingsClient() ?: return ApiResult.NetworkError("Not authenticated")
+        return client.disableTotp(password, totpCode)
+    }
+
+    suspend fun changePassword(old: String, new: String): ApiResult<Unit> {
+        return getSettingsClient()?.changePassword(old, new) ?: ApiResult.NetworkError("Not authenticated")
+    }
+
+    suspend fun updateDisplayName(name: String?): Boolean {
+        return getSettingsClient()?.updateDisplayName(name) ?: false
+    }
+
+    suspend fun updateUsername(username: String): ApiResult<Unit> {
+        return getSettingsClient()?.updateUsername(username) ?: ApiResult.NetworkError("Not authenticated")
+    }
+
+    suspend fun deleteAccount(password: String, totpCode: String?): ApiResult<Unit> {
+        return getSettingsClient()?.deleteAccount(password, totpCode) ?: ApiResult.NetworkError("Not authenticated")
+    }
+
+    fun logout() {
+        tokenStore.clear()
+        resetClient()
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/AuthMode.kt

@@ -0,0 +1,5 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+enum class AuthMode {
+    LOGIN, SIGNUP
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/AuthScreen.kt

@@ -0,0 +1,39 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import dev.zxq5.chatapp.android.model.LoginState
+
+@Composable
+fun AuthScreen(viewModel: AuthViewModel) {
+    val loginState by viewModel.loginState.collectAsState()
+    val authMode by viewModel.authMode.collectAsState()
+    val totpError by viewModel.totpError.collectAsState()
+
+    if (loginState is LoginState.TwoFactorRequired ||
+        (loginState is LoginState.Loading && totpError != null)) {
+        TwoFactorLoginScreen(
+            onVerify = { viewModel.verifyTotpLogin(it) },
+            onBack = {
+                viewModel.clearTotpError()
+                viewModel.setAuthMode(AuthMode.LOGIN)
+            },
+            isLoading = loginState is LoginState.Loading,
+            error = totpError
+        )
+        return
+    }
+
+    if (authMode == AuthMode.SIGNUP) {
+        SignupScreen(
+            viewModel = viewModel,
+            onSwitchToLogin = { viewModel.setAuthMode(AuthMode.LOGIN) }
+        )
+    } else {
+        LoginScreen(
+            viewModel = viewModel,
+            onSwitchToSignup = { viewModel.setAuthMode(AuthMode.SIGNUP) }
+        )
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/AuthViewModel.kt

@@ -0,0 +1,108 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dev.zxq5.chatapp.android.core.service.MessageStreamService
+import dev.zxq5.chatapp.android.data.repository.AuthRepository
+import dev.zxq5.chatapp.android.data.repository.LoginResult
+import dev.zxq5.chatapp.android.data.repository.SignupResult
+import dev.zxq5.chatapp.android.data.repository.AuthState
+import dev.zxq5.chatapp.android.model.LoginState
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class AuthViewModel(private val authRepository: AuthRepository) : ViewModel() {
+    
+    private val _loginState = MutableStateFlow<LoginState>(LoginState.Idle)
+    val loginState: StateFlow<LoginState> = _loginState
+
+    private val _authMode = MutableStateFlow(AuthMode.LOGIN)
+    val authMode: StateFlow<AuthMode> = _authMode
+
+    private val _authState = MutableStateFlow(authRepository.getAuthState())
+    val authState: StateFlow<AuthState> = _authState
+
+    private val _totpError = MutableStateFlow<String?>(null)
+    val totpError: StateFlow<String?> = _totpError
+
+    fun setAuthMode(mode: AuthMode) {
+        _authMode.value = mode
+        if (_loginState.value is LoginState.Error) {
+            _loginState.value = LoginState.Idle
+        }
+    }
+
+    fun signup(username: String, email: String, password: String, accessToken: String) {
+        viewModelScope.launch {
+            _loginState.value = LoginState.Loading
+            when (val result = authRepository.signup(username, email, password, accessToken)) {
+                is SignupResult.Success -> {
+                    updateAuthState()
+                    _loginState.value = LoginState.Success
+                }
+                is SignupResult.Error -> {
+                    _loginState.value = LoginState.Error(result.message)
+                }
+            }
+        }
+    }
+
+    fun login(username: String, password: String) {
+        viewModelScope.launch {
+            _loginState.value = LoginState.Loading
+            when (val result = authRepository.login(username, password)) {
+                is LoginResult.Success -> {
+                    updateAuthState()
+                    _loginState.value = LoginState.Success
+                }
+                is LoginResult.TotpRequired -> {
+                    updateAuthState()
+                    _loginState.value = LoginState.TwoFactorRequired
+                }
+                is LoginResult.Error -> {
+                    _loginState.value = LoginState.Error(result.message)
+                }
+                is LoginResult.TotpError -> {
+                    _loginState.value = LoginState.Error(result.message)
+                }
+            }
+        }
+    }
+
+    fun verifyTotpLogin(code: String) {
+        viewModelScope.launch {
+            _loginState.value = LoginState.Loading
+            when (val result = authRepository.verifyTotpLogin(code)) {
+                is LoginResult.Success -> {
+                    updateAuthState()
+                    _loginState.value = LoginState.Success
+                }
+                is LoginResult.TotpError -> {
+                    _totpError.value = result.message
+                    _loginState.value = LoginState.TwoFactorRequired
+                }
+                is LoginResult.Error -> {
+                    _loginState.value = LoginState.Error(result.message)
+                }
+                is LoginResult.TotpRequired -> {
+                    _loginState.value = LoginState.TwoFactorRequired
+                }
+            }
+        }
+    }
+
+    fun logout() {
+        authRepository.logout()
+        updateAuthState()
+        _loginState.value = LoginState.Idle
+    }
+
+    private fun updateAuthState() {
+        _authState.value = authRepository.getAuthState()
+    }
+    
+    fun clearTotpError() {
+        _totpError.value = null
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/LoginScreen.kt

@@ -0,0 +1,133 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import dev.zxq5.chatapp.android.model.LoginState
+import dev.zxq5.chatapp.android.ui.components.TextField
+
+@Composable
+fun LoginScreen(
+    viewModel: AuthViewModel,
+    onSwitchToSignup: () -> Unit
+) {
+    val loginState by viewModel.loginState.collectAsState()
+    var username by remember { mutableStateOf("") }
+    var password by remember { mutableStateOf("") }
+    var localError by remember { mutableStateOf<String?>(null) }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.background)
+            .padding(24.dp)
+            .verticalScroll(rememberScrollState()),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Spacer(Modifier.height(40.dp))
+        
+        Text(
+            text = "messenger",
+            style = MaterialTheme.typography.labelSmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(bottom = 8.dp)
+        )
+
+        Text(
+            text = "welcome back",
+            style = MaterialTheme.typography.headlineMedium,
+            color = MaterialTheme.colorScheme.onSurface,
+            modifier = Modifier.padding(bottom = 48.dp)
+        )
+
+        Column(
+            modifier = Modifier.fillMaxWidth(),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            TextField(
+                value = username,
+                onValueChange = { username = it },
+                label = "username"
+            )
+
+            TextField(
+                value = password,
+                onValueChange = { password = it },
+                label = "password",
+                isPassword = true
+            )
+        }
+
+        Spacer(Modifier.height(32.dp))
+
+        Button(
+            onClick = {
+                localError = null
+                if (username.isBlank() || password.isBlank()) {
+                    localError = "fill all fields"
+                    return@Button
+                }
+                viewModel.login(username, password)
+            },
+            enabled = loginState !is LoginState.Loading,
+            modifier = Modifier.fillMaxWidth(),
+            shape = RoundedCornerShape(8.dp),
+            colors = ButtonDefaults.buttonColors(
+                containerColor = MaterialTheme.colorScheme.primary,
+                contentColor = MaterialTheme.colorScheme.onPrimary,
+                disabledContainerColor = MaterialTheme.colorScheme.secondary
+            )
+        ) {
+            if (loginState is LoginState.Loading) {
+                CircularProgressIndicator(modifier = Modifier.size(16.dp), color = MaterialTheme.colorScheme.onPrimary, strokeWidth = 2.dp)
+            } else {
+                Text("login", style = MaterialTheme.typography.bodyLarge)
+            }
+        }
+
+        val displayError = localError ?: (loginState as? LoginState.Error)?.message
+        if (displayError != null) {
+            Text(
+                text = displayError.lowercase(),
+                style = MaterialTheme.typography.labelSmall,
+                color = Color.Red,
+                modifier = Modifier.padding(top = 16.dp)
+            )
+        }
+
+        Spacer(Modifier.height(16.dp))
+
+        TextButton(onClick = onSwitchToSignup) {
+            Text(
+                "no account? sign up",
+                style = MaterialTheme.typography.labelSmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/SignupScreen.kt

@@ -0,0 +1,160 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.dp
+import dev.zxq5.chatapp.android.model.LoginState
+import dev.zxq5.chatapp.android.ui.components.TextField
+
+@Composable
+fun SignupScreen(
+    viewModel: AuthViewModel,
+    onSwitchToLogin: () -> Unit
+) {
+    val loginState by viewModel.loginState.collectAsState()
+
+    var username by remember { mutableStateOf("") }
+    var email by remember { mutableStateOf("") }
+    var password by remember { mutableStateOf("") }
+    var confirmPassword by remember { mutableStateOf("") }
+    var accessToken by remember { mutableStateOf("") }
+    var localError by remember { mutableStateOf<String?>(null) }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.background)
+            .padding(24.dp)
+            .verticalScroll(rememberScrollState()),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Spacer(Modifier.height(40.dp))
+        
+        Text(
+            text = "messenger",
+            style = MaterialTheme.typography.labelSmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(bottom = 8.dp)
+        )
+
+        Text(
+            text = "create account",
+            style = MaterialTheme.typography.headlineMedium,
+            color = MaterialTheme.colorScheme.onSurface,
+            modifier = Modifier.padding(bottom = 48.dp)
+        )
+
+        Column(
+            modifier = Modifier.fillMaxWidth(),
+            verticalArrangement = Arrangement.spacedBy(12.dp)
+        ) {
+            TextField(
+                value = username,
+                onValueChange = { username = it },
+                label = "username"
+            )
+
+            TextField(
+                value = email,
+                onValueChange = { email = it },
+                label = "email"
+            )
+
+            TextField(
+                value = password,
+                onValueChange = { password = it },
+                label = "password",
+                isPassword = true
+            )
+
+            TextField(
+                value = confirmPassword,
+                onValueChange = { confirmPassword = it },
+                label = "confirm password",
+                isPassword = true
+            )
+            
+            TextField(
+                value = accessToken,
+                onValueChange = { accessToken = it },
+                label = "access token"
+            )
+        }
+
+        Spacer(Modifier.height(32.dp))
+
+        Button(
+            onClick = {
+                localError = null
+                if (username.isBlank() || email.isBlank() || password.isBlank() || accessToken.isBlank()) {
+                    localError = "fill all fields"
+                    return@Button
+                }
+                if (password != confirmPassword) {
+                    localError = "passwords mismatch"
+                    return@Button
+                }
+                viewModel.signup(username, email, password, accessToken)
+            },
+            enabled = loginState !is LoginState.Loading,
+            modifier = Modifier.fillMaxWidth(),
+            shape = RoundedCornerShape(8.dp),
+            colors = ButtonDefaults.buttonColors(
+                containerColor = MaterialTheme.colorScheme.primary,
+                contentColor = MaterialTheme.colorScheme.onPrimary,
+                disabledContainerColor = MaterialTheme.colorScheme.secondary
+            )
+        ) {
+            if (loginState is LoginState.Loading) {
+                CircularProgressIndicator(modifier = Modifier.size(16.dp), color = MaterialTheme.colorScheme.onPrimary, strokeWidth = 2.dp)
+            } else {
+                Text("sign up", style = MaterialTheme.typography.bodyLarge)
+            }
+        }
+
+        val displayError = localError ?: (loginState as? LoginState.Error)?.message
+        if (displayError != null) {
+            Text(
+                text = displayError.lowercase(),
+                style = MaterialTheme.typography.labelSmall,
+                color = Color.Red,
+                modifier = Modifier.padding(top = 16.dp)
+            )
+        }
+
+        Spacer(Modifier.height(16.dp))
+
+        TextButton(onClick = onSwitchToLogin) {
+            Text(
+                "have account? login",
+                style = MaterialTheme.typography.labelSmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/TokenScope.kt

@@ -0,0 +1,6 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+object TokenScope {
+    const val FULL = "full"
+    const val TOTP_PENDING = "totp_pending"
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/auth/TwoFactorLoginScreen.kt

@@ -0,0 +1,138 @@
+package dev.zxq5.chatapp.android.feature.auth
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.OutlinedTextFieldDefaults
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+@Composable
+fun TwoFactorLoginScreen(
+    onVerify: (String) -> Unit,
+    onBack: () -> Unit,
+    isLoading: Boolean,
+    error: String?
+) {
+    var code by remember { mutableStateOf("") }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colorScheme.background)
+            .padding(24.dp),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            IconButton(onClick = onBack) {
+                Icon(
+                    Icons.AutoMirrored.Filled.ArrowBack,
+                    contentDescription = "Back",
+                    tint = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+            Text(
+                "security verification",
+                style = MaterialTheme.typography.labelSmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+
+        Spacer(Modifier.height(80.dp))
+
+        Text(
+            "two-factor auth",
+            style = MaterialTheme.typography.headlineMedium,
+            color = MaterialTheme.colorScheme.onSurface
+        )
+
+        Text(
+            "enter the 6-digit code from your app",
+            style = MaterialTheme.typography.labelSmall,
+            color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+            modifier = Modifier.padding(top = 8.dp, bottom = 48.dp)
+        )
+
+        OutlinedTextField(
+            value = code,
+            onValueChange = { if (it.length <= 6) code = it },
+            placeholder = { Text("000000", color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.3f)) },
+            modifier = Modifier.width(200.dp),
+            textStyle = MaterialTheme.typography.headlineMedium.copy(
+                textAlign = TextAlign.Center,
+                letterSpacing = 8.sp
+            ),
+            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
+            shape = RoundedCornerShape(8.dp),
+            colors = OutlinedTextFieldDefaults.colors(
+                focusedBorderColor = MaterialTheme.colorScheme.primary,
+                unfocusedBorderColor = MaterialTheme.colorScheme.outlineVariant,
+                focusedContainerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f),
+                unfocusedContainerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f)
+            ),
+            singleLine = true
+        )
+
+        if (error != null) {
+            Text(
+                text = error.lowercase(),
+                style = MaterialTheme.typography.labelSmall,
+                color = Color.Red,
+                modifier = Modifier.padding(top = 12.dp)
+            )
+        } else {
+            Spacer(Modifier.height(12.dp)) 
+        }
+
+        Spacer(Modifier.height(36.dp))
+
+        Button(
+            onClick = { if (code.length == 6) onVerify(code) },
+            enabled = code.length == 6 && !isLoading,
+            modifier = Modifier.fillMaxWidth(),
+            shape = RoundedCornerShape(8.dp),
+            colors = ButtonDefaults.buttonColors(
+                containerColor = MaterialTheme.colorScheme.primary,
+                contentColor = MaterialTheme.colorScheme.onPrimary
+            )
+        ) {
+            if (isLoading) {
+                CircularProgressIndicator(modifier = Modifier.size(16.dp), color = MaterialTheme.colorScheme.onPrimary, strokeWidth = 2.dp)
+            } else {
+                Text("verify", style = MaterialTheme.typography.bodyLarge)
+            }
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/chat/ChatViewModel.kt

@@ -0,0 +1,130 @@
+package dev.zxq5.chatapp.android.feature.chat
+
+import android.util.Log
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dev.zxq5.chatapp.android.api.model.Channel
+import dev.zxq5.chatapp.android.data.repository.ChatRepository
+import dev.zxq5.chatapp.android.api.model.Message
+import dev.zxq5.chatapp.android.api.model.Space
+import dev.zxq5.chatapp.android.api.model.SpaceDto
+import dev.zxq5.chatapp.android.core.service.MessageStreamService
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+class ChatViewModel(private val chatRepository: ChatRepository) : ViewModel() {
+
+    private val _messages = MutableStateFlow<List<Message>>(emptyList())
+    val messages: StateFlow<List<Message>> = _messages
+
+    private val _channelId = MutableStateFlow<Long?>(null)
+    val channelId: StateFlow<Long?> = _channelId
+
+    private val _currentScreen = MutableStateFlow(Screen.CHAT)
+    val currentScreen: StateFlow<Screen> = _currentScreen
+
+    private val _currentUserId = MutableStateFlow<Int?>(null)
+    val currentUserId: StateFlow<Int?> = _currentUserId
+
+    private val _spaces = MutableStateFlow<List<SpaceDto>>(emptyList())
+    val spaces: StateFlow<List<SpaceDto>> = _spaces
+
+    private val _error = MutableStateFlow<String?>(null)
+    val error: StateFlow<String?> = _error
+
+    private val _channelError = MutableStateFlow<String?>(null)
+    val channelError: StateFlow<String?> = _channelError
+
+    private var streamJob: Job? = null
+
+    init {
+        _currentUserId.value = chatRepository.getUserId()
+        observeChannel()
+        loadAccessibleChannels()
+    }
+
+    fun loadAccessibleChannels() {
+        _error.value = null
+        viewModelScope.launch {
+            runCatching {
+                chatRepository.getAccessibleChannels()
+            }.onSuccess { data ->
+                _spaces.value = data
+            }.onFailure { e ->
+                Log.e("Chat", "Failed to load spaces", e)
+                _error.value = "Failed to load channels: ${e.message}"
+            }
+        }
+    }
+
+    private fun observeChannel() {
+        viewModelScope.launch {
+            _channelId.collect { id ->
+                streamJob?.cancel()
+                _messages.value = emptyList()
+                _channelError.value = null
+                if (id != null) {
+                    streamJob = launch {
+                        chatRepository.messageStream(id)
+                            .catch { e -> 
+                                Log.e("Chat", "Stream error", e)
+                                _channelError.value = "Connection lost: ${e.message}"
+                            }
+                            .collect { message ->
+                                _messages.update { it + message }
+                            }
+                    }
+                }
+            }
+        }
+    }
+
+    fun navigateTo(screen: Screen) {
+        _currentScreen.value = screen
+    }
+
+    fun switchChannel(id: Long?) {
+        _channelId.value = id
+
+        MessageStreamService.instance?.activeChannelId = id
+
+        if (id != null) {
+            // Refresh user ID just in case it wasn't available at init
+            _currentUserId.value = chatRepository.getUserId()
+        }
+    }
+
+    fun sendMessage(text: String) {
+        val currentId = _channelId.value ?: return
+        viewModelScope.launch {
+            runCatching {
+                chatRepository.sendMessage(
+                    channelId = currentId,
+                    text = text
+                )
+            }.onFailure { e ->
+                Log.e("Chat", "Send message error", e)
+                _channelError.value = "Failed to send message"
+            }
+        }
+    }
+    
+    fun clearChat() {
+        _messages.value = emptyList()
+        _channelId.value = null
+        _currentUserId.value = null
+        _error.value = null
+        _channelError.value = null
+        streamJob?.cancel()
+        chatRepository.resetClient()
+        MessageStreamService.instance?.activeChannelId = null
+    }
+
+    fun clearChannelError() {
+        _channelError.value = null
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/chat/Screen.kt

@@ -0,0 +1,5 @@
+package dev.zxq5.chatapp.android.feature.chat
+
+enum class Screen {
+    CHAT, CONTACTS, SETTINGS
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/chat/chat.kt

@@ -1,5 +1,6 @@
-package dev.zxq5.chatapp.android.ui.components
+package dev.zxq5.chatapp.android.feature.chat
 
+import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
@@ -26,21 +27,18 @@ import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
-import androidx.compose.material.icons.automirrored.filled.ExitToApp
 import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material.icons.filled.Send
-import androidx.compose.material.icons.filled.Settings
-import androidx.compose.material.icons.outlined.ChatBubbleOutline
-import androidx.compose.material.icons.outlined.Settings
+import androidx.compose.material3.Button
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.NavigationBar
-import androidx.compose.material3.NavigationBarItem
-import androidx.compose.material3.NavigationBarItemDefaults
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
@@ -57,16 +55,23 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
-import dev.zxq5.chatapp.android.model.ChatViewModel
-import dev.zxq5.chatapp.android.model.MainScreen
-import dev.zxq5.chatapp.android.model.Message
+import dev.zxq5.chatapp.android.api.model.Channel
+import dev.zxq5.chatapp.android.api.model.Message
 import java.text.DateFormat
 import java.util.Date
+import kotlin.time.ExperimentalTime
 
 @Composable
-fun ChatScreen(viewModel: ChatViewModel) {
+fun ChatScreen(
+    viewModel: ChatViewModel,
+    onNavigateToSettings: () -> Unit,
+    onLogout: () -> Unit
+) {
     val selectedChannelId by viewModel.channelId.collectAsState()
 
     if (selectedChannelId == null) {
@@ -85,18 +90,17 @@ fun ChatScreen(viewModel: ChatViewModel) {
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun ChannelListScreen(viewModel: ChatViewModel, onChannelSelect: (Int) -> Unit) {
+fun ChannelListScreen(
+    viewModel: ChatViewModel, 
+    onChannelSelect: (Long) -> Unit
+) {
+    val spaces by viewModel.spaces.collectAsState()
+    val error by viewModel.error.collectAsState()
+
     Scaffold(
         containerColor = MaterialTheme.colorScheme.background,
         topBar = {
             Column {
-                Spacer(Modifier.height(8.dp))
-                Text(
-                    "contacts",
-                    style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                    modifier = Modifier.padding(horizontal = 20.dp)
-                )
                 TopAppBar(
                     title = { 
                         Text(
@@ -108,103 +112,69 @@ fun ChannelListScreen(viewModel: ChatViewModel, onChannelSelect: (Int) -> Unit)
                     colors = TopAppBarDefaults.topAppBarColors(
                         containerColor = Color.Transparent,
                         titleContentColor = MaterialTheme.colorScheme.onSurface
-                    )
+                    ),
+                    windowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
+
                 )
                 Text(
-                    "5 channels · end-to-end encrypted",
+                    "Public channels - dms coming soon.",
                     style = MaterialTheme.typography.labelSmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.4f),
                     modifier = Modifier.padding(horizontal = 20.dp, vertical = 2.dp)
                 )
                 Spacer(Modifier.height(12.dp))
-                
-                Row(
-                    modifier = Modifier
-                        .fillMaxWidth()
-                        .background(MaterialTheme.colorScheme.secondary.copy(alpha = 0.2f))
-                        .padding(horizontal = 20.dp, vertical = 8.dp),
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    Box(
-                        modifier = Modifier
-                            .size(6.dp)
-                            .clip(CircleShape)
-                            .background(MaterialTheme.colorScheme.primary)
-                    )
-                    Spacer(Modifier.width(10.dp))
-                    Text(
-                        "global · walkie talkie",
-                        style = MaterialTheme.typography.labelSmall,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant,
-                        modifier = Modifier.weight(1f)
-                    )
-                    Surface(
-                        color = Color.Transparent,
-                        border = border(0.5.dp, MaterialTheme.colorScheme.outlineVariant),
-                        shape = RoundedCornerShape(4.dp)
-                    ) {
-                        Text(
-                            "hold to talk",
-                            modifier = Modifier.padding(horizontal = 8.dp, vertical = 3.dp),
-                            style = MaterialTheme.typography.labelSmall,
-                            color = MaterialTheme.colorScheme.onSurfaceVariant
-                        )
-                    }
+            }
+        }
+    ) { padding ->
+        if (error != null) {
+            Column(
+                modifier = Modifier.fillMaxSize().padding(padding),
+                horizontalAlignment = Alignment.CenterHorizontally,
+                verticalArrangement = Arrangement.Center
+            ) {
+                Text(
+                    text = error!!,
+                    color = MaterialTheme.colorScheme.error,
+                    textAlign = TextAlign.Center,
+                    modifier = Modifier.padding(16.dp)
+                )
+                Button(onClick = { viewModel.loadAccessibleChannels() }) {
+                    Icon(Icons.Default.Refresh, contentDescription = null)
+                    Spacer(Modifier.width(8.dp))
+                    Text("Retry")
                 }
             }
-        },
-        bottomBar = { BottomDock(viewModel) }
-    ) { padding ->
-        LazyColumn(modifier = Modifier.padding(padding).fillMaxSize()) {
-            items(10) { i ->
-                val id = i + 1
-                ChannelItem(id = id, onClick = { onChannelSelect(id) })
-                HorizontalDivider(
-                    modifier = Modifier.padding(horizontal = 20.dp),
-                    thickness = 0.5.dp,
-                    color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f)
-                )
+        } else {
+            LazyColumn(modifier = Modifier.padding(padding).fillMaxSize()) {
+                spaces.forEach { spaceDto ->
+                    item {
+                        Text(
+                            text = spaceDto.name.lowercase(),
+                            modifier = Modifier.padding(horizontal = 20.dp, vertical = 8.dp),
+                            style = MaterialTheme.typography.labelMedium,
+                            color = MaterialTheme.colorScheme.primary,
+                            fontWeight = FontWeight.Bold
+                        )
+                    }
+                    items(spaceDto.channels) { channel ->
+                        ChannelItem(channel = channel, onClick = { onChannelSelect(channel.id) })
+                        HorizontalDivider(
+                            modifier = Modifier.padding(horizontal = 20.dp),
+                            thickness = 0.5.dp,
+                            color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f)
+                        )
+                    }
+                    item {
+                        Spacer(Modifier.height(16.dp))
+                    }
+                }
             }
         }
     }
 }
 
 @Composable
-fun BottomDock(viewModel: ChatViewModel) {
-    val currentScreen by viewModel.currentScreen.collectAsState()
-    
-    NavigationBar(
-        containerColor = MaterialTheme.colorScheme.background,
-        tonalElevation = 0.dp,
-        modifier = Modifier.border(0.5.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f), RoundedCornerShape(topStart = 0.dp, topEnd = 0.dp))
-    ) {
-        NavigationBarItem(
-            selected = currentScreen == MainScreen.CHAT,
-            onClick = { viewModel.navigateTo(MainScreen.CHAT) },
-            icon = { Icon(Icons.Outlined.ChatBubbleOutline, contentDescription = "Chat") },
-            label = { Text("chat", style = MaterialTheme.typography.labelSmall) },
-            colors = NavigationBarItemDefaults.colors(
-                selectedIconColor = MaterialTheme.colorScheme.primary,
-                unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                indicatorColor = Color.Transparent
-            )
-        )
-        NavigationBarItem(
-            selected = currentScreen == MainScreen.SETTINGS,
-            onClick = { viewModel.navigateTo(MainScreen.SETTINGS) },
-            icon = { Icon(Icons.Outlined.Settings, contentDescription = "Settings") },
-            label = { Text("settings", style = MaterialTheme.typography.labelSmall) },
-            colors = NavigationBarItemDefaults.colors(
-                selectedIconColor = MaterialTheme.colorScheme.primary,
-                unselectedIconColor = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                indicatorColor = Color.Transparent
-            )
-        )
-    }
-}
-
-@Composable
-fun ChannelItem(id: Int, onClick: () -> Unit) {
+fun ChannelItem(channel: Channel, onClick: () -> Unit) {
     Row(
         modifier = Modifier
             .fillMaxWidth()
@@ -220,7 +190,7 @@ fun ChannelItem(id: Int, onClick: () -> Unit) {
             contentAlignment = Alignment.Center
         ) {
             Text(
-                "C$id", 
+                channel.name.take(1).uppercase(), 
                 style = MaterialTheme.typography.labelSmall,
                 color = MaterialTheme.colorScheme.onSurfaceVariant
             )
@@ -228,31 +198,30 @@ fun ChannelItem(id: Int, onClick: () -> Unit) {
         Spacer(Modifier.width(12.dp))
         Column(modifier = Modifier.weight(1f)) {
             Text(
-                text = "channel $id", 
+                text = channel.name, 
                 style = MaterialTheme.typography.bodyLarge,
                 color = MaterialTheme.colorScheme.onSurface
             )
-            Text(
-                text = "tap to join",
-                style = MaterialTheme.typography.labelSmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
-            )
+            if (channel.description != null) {
+                Text(
+                    text = channel.description,
+                    style = MaterialTheme.typography.labelSmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                )
+            }
         }
-        Text(
-            "14:22",
-            style = MaterialTheme.typography.labelSmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.3f)
-        )
     }
 }
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
-fun MessageScreen(channelId: Int, viewModel: ChatViewModel, onBack: () -> Unit) {
+fun MessageScreen(channelId: Long, viewModel: ChatViewModel, onBack: () -> Unit) {
     val messages by viewModel.messages.collectAsState()
     val currentUserId by viewModel.currentUserId.collectAsState()
+    val channelError by viewModel.channelError.collectAsState()
     var input by remember { mutableStateOf("") }
     val listState = rememberLazyListState()
+    val snackbarHostState = remember { SnackbarHostState() }
 
     LaunchedEffect(messages.size) {
         if (messages.isNotEmpty()) {
@@ -260,8 +229,16 @@ fun MessageScreen(channelId: Int, viewModel: ChatViewModel, onBack: () -> Unit)
         }
     }
 
+    LaunchedEffect(channelError) {
+        channelError?.let {
+            snackbarHostState.showSnackbar(it)
+            viewModel.clearChannelError()
+        }
+    }
+
     Scaffold(
         containerColor = MaterialTheme.colorScheme.background,
+        snackbarHost = { SnackbarHost(snackbarHostState) },
         topBar = {
             TopAppBar(
                 title = { 
@@ -287,6 +264,7 @@ fun MessageScreen(channelId: Int, viewModel: ChatViewModel, onBack: () -> Unit)
                         )
                     }
                 },
+                windowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
                 colors = TopAppBarDefaults.topAppBarColors(
                     containerColor = Color.Transparent
                 )
@@ -384,10 +362,13 @@ fun MessageScreen(channelId: Int, viewModel: ChatViewModel, onBack: () -> Unit)
     }
 }
 
+@OptIn(ExperimentalTime::class)
 @Composable
 fun MessageBubble(message: Message, currentUserId: Int?) {
     val time = remember(message.timestamp) {
-        DateFormat.getTimeInstance(DateFormat.SHORT).format(Date(message.timestamp)).lowercase()
+        DateFormat.getTimeInstance(DateFormat.SHORT)
+            .format(Date(message.timestamp.toEpochMilliseconds()))
+            .lowercase()
     }
     
     val isMe = currentUserId != null && message.user_id == currentUserId
@@ -409,7 +390,7 @@ fun MessageBubble(message: Message, currentUserId: Int?) {
             Column(modifier = Modifier.padding(horizontal = 11.dp, vertical = 8.dp)) {
                 if (!isMe) {
                     Text(
-                        message.display_name.lowercase(),
+                        message.display_name?.lowercase() ?: "unknown",
                         style = MaterialTheme.typography.labelSmall,
                         color = MaterialTheme.colorScheme.primary.copy(alpha = 0.7f),
                         modifier = Modifier.padding(bottom = 2.dp)
@@ -431,5 +412,5 @@ fun MessageBubble(message: Message, currentUserId: Int?) {
     }
 }
 
-private fun border(width: androidx.compose.ui.unit.Dp, color: Color) = 
-    androidx.compose.foundation.BorderStroke(width, color)
+private fun border(width: Dp, color: Color) =
+    BorderStroke(width, color)

android/app/src/main/java/dev/zxq5/chatapp/android/feature/contacts/ContactsScreen.kt

@@ -0,0 +1,52 @@
+package dev.zxq5.chatapp.android.feature.contacts
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ContactsScreen() {
+    Scaffold(
+        containerColor = MaterialTheme.colorScheme.background,
+        topBar = {
+            TopAppBar(
+                title = { 
+                    Text(
+                        "contacts", 
+                        style = MaterialTheme.typography.titleLarge,
+                        color = MaterialTheme.colorScheme.onSurface
+                    ) 
+                },
+                windowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = Color.Transparent,
+                    titleContentColor = MaterialTheme.colorScheme.onSurface
+                )
+            )
+        }
+    ) { padding ->
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(padding),
+            contentAlignment = Alignment.Center
+        ) {
+            Text(
+                text = "Contacts coming soon",
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/settings/SettingsViewModel.kt

@@ -0,0 +1,157 @@
+package dev.zxq5.chatapp.android.feature.settings
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import dev.zxq5.chatapp.android.api.model.QrResponse
+import dev.zxq5.chatapp.android.core.error.ApiResult
+import dev.zxq5.chatapp.android.data.repository.SettingsRepository
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class SettingsViewModel(private val settingsRepository: SettingsRepository) : ViewModel() {
+
+    private val _is2faEnabled = MutableStateFlow(false)
+    val is2faEnabled: StateFlow<Boolean> = _is2faEnabled
+
+    private val _totpQr = MutableStateFlow<QrResponse?>(null)
+    val totpQr: StateFlow<QrResponse?> = _totpQr
+
+    private val _totpError = MutableStateFlow<String?>(null)
+    val totpError: StateFlow<String?> = _totpError
+
+    private val _settingsError = MutableStateFlow<String?>(null)
+    val settingsError: StateFlow<String?> = _settingsError
+
+    private val _isSuccessState = MutableStateFlow<Map<String, Boolean>>(emptyMap())
+    val isSuccessState: StateFlow<Map<String, Boolean>> = _isSuccessState
+
+    fun clearMessages() {
+        _settingsError.value = null
+        _totpError.value = null
+    }
+
+    private fun triggerSuccess(key: String) {
+        viewModelScope.launch {
+            _isSuccessState.value = _isSuccessState.value + (key to true)
+            delay(5000)
+            _isSuccessState.value = _isSuccessState.value + (key to false)
+        }
+    }
+
+    fun fetchTotpStatus() {
+        viewModelScope.launch {
+            when (val result = settingsRepository.getTotpStatus()) {
+                is ApiResult.Success -> _is2faEnabled.value = result.data.isEnabled
+                else -> {}
+            }
+        }
+    }
+
+    fun fetchTotpQr(password: String) {
+        viewModelScope.launch {
+            _totpError.value = null
+            when (val result = settingsRepository.getTotpQr(password)) {
+                is ApiResult.Success -> {
+                    _totpQr.value = result.data
+                }
+                is ApiResult.HttpError -> {
+                    _totpError.value = result.message
+                }
+                is ApiResult.NetworkError -> {
+                    _totpError.value = "Network error: ${result.message}"
+                }
+            }
+        }
+    }
+
+    fun confirmTotp(code: String) {
+        viewModelScope.launch {
+            _totpError.value = null
+            when (val result = settingsRepository.confirmTotp(code)) {
+                is ApiResult.Success -> {
+                    _is2faEnabled.value = true
+                    _totpQr.value = null
+                    triggerSuccess("2fa")
+                }
+                is ApiResult.HttpError -> {
+                    _totpError.value = result.message
+                }
+                is ApiResult.NetworkError -> {
+                    _totpError.value = "Network error: ${result.message}"
+                }
+            }
+        }
+    }
+
+    fun disableTotp(password: String, totpCode: String) {
+        viewModelScope.launch {
+            _totpError.value = null
+            when (val result = settingsRepository.disableTotp(password, totpCode)) {
+                is ApiResult.Success -> {
+                    _is2faEnabled.value = false
+                    triggerSuccess("2fa")
+                }
+                is ApiResult.HttpError -> _totpError.value = result.message
+                is ApiResult.NetworkError -> _totpError.value = "Network error: ${result.message}"
+            }
+        }
+    }
+
+    fun changePassword(old: String, new: String) {
+        viewModelScope.launch {
+            clearMessages()
+            when (val result = settingsRepository.changePassword(old, new)) {
+                is ApiResult.Success -> {
+                    triggerSuccess("password")
+                }
+                is ApiResult.HttpError -> _settingsError.value = result.message
+                is ApiResult.NetworkError -> _settingsError.value = "Network error: ${result.message}"
+            }
+        }
+    }
+
+    fun updateDisplayName(name: String?) {
+        viewModelScope.launch {
+            clearMessages()
+            if (settingsRepository.updateDisplayName(name)) {
+                triggerSuccess("display_name")
+            } else {
+                _settingsError.value = "Failed to update display name"
+            }
+        }
+    }
+
+    fun updateUsername(username: String) {
+        viewModelScope.launch {
+            clearMessages()
+            when (val result = settingsRepository.updateUsername(username)) {
+                is ApiResult.Success -> {
+                    triggerSuccess("username")
+                }
+                is ApiResult.HttpError -> _settingsError.value = result.message
+                is ApiResult.NetworkError -> _settingsError.value = "Network error: ${result.message}"
+            }
+        }
+    }
+
+    fun deleteAccount(password: String, totpCode: String?, onLogout: () -> Unit) {
+        viewModelScope.launch {
+            clearMessages()
+            when (val result = settingsRepository.deleteAccount(password, totpCode)) {
+                is ApiResult.Success -> {
+                    _isSuccessState.value = _isSuccessState.value + ("delete" to true)
+                    delay(3000)
+                    onLogout()
+                }
+                is ApiResult.HttpError -> _settingsError.value = result.message
+                is ApiResult.NetworkError -> _settingsError.value = "Network error: ${result.message}"
+            }
+        }
+    }
+
+    fun logout() {
+        settingsRepository.logout()
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/feature/settings/settings.kt

@@ -0,0 +1,525 @@
+package dev.zxq5.chatapp.android.feature.settings
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.animateColorAsState
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.KeyboardArrowDown
+import androidx.compose.material.icons.filled.KeyboardArrowUp
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.OutlinedTextFieldDefaults
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import android.util.Base64
+import android.graphics.BitmapFactory
+import androidx.compose.ui.text.style.TextAlign
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SettingsScreen(
+    viewModel: SettingsViewModel,
+    onLogout: () -> Unit
+) {
+    val is2faEnabled by viewModel.is2faEnabled.collectAsState()
+    val totpQr by viewModel.totpQr.collectAsState()
+    val settingsError by viewModel.settingsError.collectAsState()
+    val isSuccessState by viewModel.isSuccessState.collectAsState()
+    val totpError by viewModel.totpError.collectAsState()
+    
+    LaunchedEffect(Unit) {
+        viewModel.clearMessages()
+        viewModel.fetchTotpStatus()
+    }
+
+    Scaffold(
+        containerColor = MaterialTheme.colorScheme.background,
+        topBar = {
+            TopAppBar(
+                title = { 
+                    Text(
+                        "settings", 
+                        style = MaterialTheme.typography.titleLarge,
+                        color = MaterialTheme.colorScheme.onSurface
+                    ) 
+                },
+                windowInsets = androidx.compose.foundation.layout.WindowInsets(0, 0, 0, 0),
+                colors = TopAppBarDefaults.topAppBarColors(containerColor = Color.Transparent)
+            )
+        }
+    ) { padding ->
+        Column(
+            modifier = Modifier
+                .padding(padding)
+                .fillMaxSize()
+                .verticalScroll(rememberScrollState())
+                .padding(20.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp)
+        ) {
+            SettingsSection(title = "profile") {
+                var displayName by remember { mutableStateOf("") }
+                var username by remember { mutableStateOf("") }
+
+                SettingsField(
+                    label = "display name",
+                    value = displayName,
+                    onValueChange = { displayName = it },
+                    buttonLabel = "update",
+                    isSuccess = isSuccessState["display_name"] == true,
+                    onClick = { viewModel.updateDisplayName(displayName.ifBlank { null }) }
+                )
+
+                Spacer(Modifier.height(16.dp))
+
+                SettingsField(
+                    label = "username",
+                    value = username,
+                    onValueChange = { username = it },
+                    buttonLabel = "update",
+                    isSuccess = isSuccessState["username"] == true,
+                    onClick = { if (username.isNotBlank()) viewModel.updateUsername(username) }
+                )
+            }
+
+            SettingsSection(title = "security") {
+                var oldPassword by remember { mutableStateOf("") }
+                var newPassword by remember { mutableStateOf("") }
+
+                Text("change password", style = MaterialTheme.typography.bodyMedium, modifier = Modifier.padding(bottom = 8.dp))
+                OutlinedTextField(
+                    value = oldPassword,
+                    onValueChange = { oldPassword = it },
+                    label = { Text("old password") },
+                    visualTransformation = PasswordVisualTransformation(),
+                    modifier = Modifier.fillMaxWidth(),
+                    shape = RoundedCornerShape(8.dp)
+                )
+                Spacer(Modifier.height(8.dp))
+                OutlinedTextField(
+                    value = newPassword,
+                    onValueChange = { newPassword = it },
+                    label = { Text("new password") },
+                    visualTransformation = PasswordVisualTransformation(),
+                    modifier = Modifier.fillMaxWidth(),
+                    shape = RoundedCornerShape(8.dp)
+                )
+                Spacer(Modifier.height(12.dp))
+                SuccessButton(
+                    onClick = { 
+                        viewModel.changePassword(oldPassword, newPassword)
+                        oldPassword = ""
+                        newPassword = ""
+                    },
+                    label = "update password",
+                    isSuccess = isSuccessState["password"] == true,
+                    enabled = oldPassword.isNotEmpty() && newPassword.isNotEmpty(),
+                    modifier = Modifier.fillMaxWidth()
+                )
+
+                HorizontalDivider(modifier = Modifier.padding(vertical = 16.dp), color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f))
+
+                var show2faSetup by remember { mutableStateOf(false) }
+                var setupPassword by remember { mutableStateOf("") }
+                
+                var show2faDisable by remember { mutableStateOf(false) }
+                var disablePassword by remember { mutableStateOf("") }
+                var disableCode by remember { mutableStateOf("") }
+
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Column(modifier = Modifier.weight(1f)) {
+                        Text("two-factor authentication", style = MaterialTheme.typography.bodyLarge)
+                        Text(
+                            if (is2faEnabled) "enabled" else "disabled",
+                            style = MaterialTheme.typography.labelSmall,
+                            color = if (is2faEnabled) Color.Green.copy(alpha = 0.7f) else MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                        )
+                    }
+                    
+                    if (!is2faEnabled) {
+                        Button(
+                            onClick = { 
+                                show2faSetup = !show2faSetup
+                                if (!show2faSetup) setupPassword = ""
+                            },
+                            shape = RoundedCornerShape(8.dp),
+                            colors = ButtonDefaults.buttonColors(containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f), contentColor = MaterialTheme.colorScheme.onSurface)
+                        ) {
+                            Text(if (show2faSetup) "cancel" else "setup", style = MaterialTheme.typography.labelSmall)
+                        }
+                    } else {
+                        SuccessButton(
+                            onClick = { 
+                                show2faDisable = !show2faDisable 
+                                if (!show2faDisable) {
+                                    disablePassword = ""
+                                    disableCode = ""
+                                }
+                            },
+                            label = if (show2faDisable) "cancel" else "disable",
+                            isSuccess = isSuccessState["2fa"] == true,
+                            baseColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f),
+                            contentColor = Color.Red,
+                            successColor = Color.Red
+                        )
+                    }
+                }
+
+                if (show2faSetup && !is2faEnabled) {
+                    Spacer(Modifier.height(16.dp))
+                    if (totpQr == null) {
+                        OutlinedTextField(
+                            value = setupPassword,
+                            onValueChange = { setupPassword = it },
+                            label = { Text("confirm password to setup") },
+                            visualTransformation = PasswordVisualTransformation(),
+                            modifier = Modifier.fillMaxWidth(),
+                            shape = RoundedCornerShape(8.dp)
+                        )
+                        Spacer(Modifier.height(8.dp))
+                        Button(
+                            onClick = { viewModel.fetchTotpQr(setupPassword) },
+                            enabled = setupPassword.isNotBlank(),
+                            modifier = Modifier.fillMaxWidth()
+                        ) {
+                            Text("get qr code")
+                        }
+                    } else {
+                        TwoFactorSetup(
+                            qrCodeBase64 = totpQr?.qr_code,
+                            error = totpError,
+                            onConfirm = { viewModel.confirmTotp(it) }
+                        )
+                    }
+                }
+
+                if (show2faDisable && is2faEnabled) {
+                    Spacer(Modifier.height(16.dp))
+                    OutlinedTextField(
+                        value = disablePassword,
+                        onValueChange = { disablePassword = it },
+                        label = { Text("password") },
+                        visualTransformation = PasswordVisualTransformation(),
+                        modifier = Modifier.fillMaxWidth(),
+                        shape = RoundedCornerShape(8.dp)
+                    )
+                    Spacer(Modifier.height(8.dp))
+                    OutlinedTextField(
+                        value = disableCode,
+                        onValueChange = { if (it.length <= 6) disableCode = it },
+                        label = { Text("2fa code") },
+                        modifier = Modifier.fillMaxWidth(),
+                        shape = RoundedCornerShape(8.dp),
+                        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
+                    )
+                    Spacer(Modifier.height(8.dp))
+                    SuccessButton(
+                        onClick = { viewModel.disableTotp(disablePassword, disableCode) },
+                        label = "confirm disable",
+                        isSuccess = isSuccessState["2fa"] == true,
+                        baseColor = Color.Red,
+                        enabled = disablePassword.isNotBlank() && disableCode.length == 6,
+                        modifier = Modifier.fillMaxWidth()
+                    )
+                }
+                
+                if (totpError != null && !show2faSetup && !show2faDisable) {
+                     Text(totpError!!.lowercase(), color = Color.Red, style = MaterialTheme.typography.labelSmall, modifier = Modifier.padding(top = 8.dp))
+                }
+            }
+
+            SettingsSection(title = "danger zone", color = Color.Red.copy(alpha = 0.7f)) {
+                var deletePassword by remember { mutableStateOf("") }
+                var deleteTotp by remember { mutableStateOf("") }
+                var showDeleteConfirm by remember { mutableStateOf(false) }
+
+                if (!showDeleteConfirm) {
+                    Button(
+                        onClick = { showDeleteConfirm = true },
+                        modifier = Modifier.fillMaxWidth(),
+                        shape = RoundedCornerShape(8.dp),
+                        colors = ButtonDefaults.buttonColors(containerColor = Color.Red.copy(alpha = 0.1f), contentColor = Color.Red)
+                    ) {
+                        Text("delete account")
+                    }
+                } else {
+                    Text("confirm account deletion", color = Color.Red, style = MaterialTheme.typography.bodyMedium)
+                    Spacer(Modifier.height(8.dp))
+                    OutlinedTextField(
+                        value = deletePassword,
+                        onValueChange = { deletePassword = it },
+                        label = { Text("password") },
+                        visualTransformation = PasswordVisualTransformation(),
+                        modifier = Modifier.fillMaxWidth(),
+                        shape = RoundedCornerShape(8.dp)
+                    )
+                    if (is2faEnabled) {
+                        Spacer(Modifier.height(8.dp))
+                        OutlinedTextField(
+                            value = deleteTotp,
+                            onValueChange = { if (it.length <= 6) deleteTotp = it },
+                            label = { Text("2fa code") },
+                            modifier = Modifier.fillMaxWidth(),
+                            shape = RoundedCornerShape(8.dp),
+                            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
+                        )
+                    }
+                    Spacer(Modifier.height(12.dp))
+                    Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        Button(
+                            onClick = { showDeleteConfirm = false },
+                            modifier = Modifier.weight(1f),
+                            shape = RoundedCornerShape(8.dp),
+                            colors = ButtonDefaults.buttonColors(containerColor = MaterialTheme.colorScheme.surfaceVariant)
+                        ) {
+                            Text("cancel")
+                        }
+                        SuccessButton(
+                            onClick = { viewModel.deleteAccount(
+                                deletePassword, deleteTotp.ifBlank { null },
+                                onLogout
+                            ) },
+                            label = "delete forever",
+                            isSuccess = isSuccessState["delete"] == true,
+                            baseColor = Color.Red.copy(alpha = 0.1f),
+                            contentColor = Color.Red,
+                            successColor = Color.Red,
+                            modifier = Modifier.weight(1f),
+                            enabled = deletePassword.isNotEmpty() && (!is2faEnabled || deleteTotp.length == 6)
+                        )
+                    }
+                }
+            }
+
+            SettingsSection(title = "session") {
+                Spacer(Modifier.height(16.dp))
+                Button(
+                    onClick = onLogout,
+                    modifier = Modifier.fillMaxWidth(),
+                    shape = RoundedCornerShape(8.dp),
+                    colors = ButtonDefaults.buttonColors(containerColor = Color.White, contentColor = Color.Black)
+                ) {
+                    Text("logout")
+                }
+            }
+
+            if (settingsError != null) {
+                Text(settingsError!!, color = Color.Red, style = MaterialTheme.typography.bodySmall, modifier = Modifier.padding(top = 8.dp))
+            }
+        }
+    }
+}
+
+@Composable
+fun SettingsSection(
+    title: String, 
+    color: Color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
+    content: @Composable () -> Unit
+) {
+    var expanded by remember { mutableStateOf(true) }
+    
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .border(0.5.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f), RoundedCornerShape(12.dp))
+            .clip(RoundedCornerShape(12.dp))
+            .background(MaterialTheme.colorScheme.surface.copy(alpha = 0.5f))
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clickable { expanded = !expanded }
+                .padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.SpaceBetween
+        ) {
+            Text(title.lowercase(), style = MaterialTheme.typography.labelSmall, color = color)
+            Icon(
+                if (expanded) Icons.Default.KeyboardArrowUp else Icons.Default.KeyboardArrowDown,
+                contentDescription = null,
+                tint = color,
+                modifier = Modifier.size(16.dp)
+            )
+        }
+        
+        AnimatedVisibility(visible = expanded) {
+            Column(modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp).padding(bottom = 8.dp)) {
+                content()
+            }
+        }
+    }
+}
+
+@Composable
+fun SettingsField(
+    label: String,
+    value: String,
+    onValueChange: (String) -> Unit,
+    buttonLabel: String,
+    isSuccess: Boolean,
+    onClick: () -> Unit
+) {
+    Column {
+        OutlinedTextField(
+            value = value,
+            onValueChange = onValueChange,
+            label = { Text(label) },
+            modifier = Modifier.fillMaxWidth(),
+            shape = RoundedCornerShape(8.dp),
+            colors = OutlinedTextFieldDefaults.colors(
+                focusedBorderColor = if (isSuccess) Color.Green else MaterialTheme.colorScheme.primary
+            )
+        )
+        Spacer(Modifier.height(8.dp))
+        SuccessButton(
+            onClick = onClick,
+            label = buttonLabel,
+            isSuccess = isSuccess,
+            enabled = value.isNotBlank(),
+            modifier = Modifier.fillMaxWidth()
+        )
+    }
+}
+
+@Composable
+fun SuccessButton(
+    onClick: () -> Unit,
+    label: String,
+    isSuccess: Boolean,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+    baseColor: Color = MaterialTheme.colorScheme.primary,
+    contentColor: Color = MaterialTheme.colorScheme.onPrimary,
+    successColor: Color = Color.Green.copy(alpha = 0.8f)
+) {
+    val backgroundColor by animateColorAsState(
+        targetValue = if (isSuccess) successColor else baseColor,
+        animationSpec = tween(500)
+    )
+
+    Button(
+        onClick = onClick,
+        modifier = modifier,
+        enabled = enabled,
+        shape = RoundedCornerShape(8.dp),
+        colors = ButtonDefaults.buttonColors(
+            containerColor = backgroundColor,
+            contentColor = if (isSuccess) Color.White else contentColor
+        )
+    ) {
+        Text(if (isSuccess) "success" else label)
+    }
+}
+
+@Composable
+fun TwoFactorSetup(
+    qrCodeBase64: String?,
+    error: String?,
+    onConfirm: (String) -> Unit
+) {
+    var code by remember { mutableStateOf("") }
+    
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .border(0.5.dp, MaterialTheme.colorScheme.outlineVariant, RoundedCornerShape(12.dp))
+            .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f), RoundedCornerShape(12.dp))
+            .padding(20.dp),
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        if (qrCodeBase64 != null) {
+            val bitmap = remember(qrCodeBase64) {
+                val base64Data = qrCodeBase64.substringAfter("base64,")
+                val decodedString = Base64.decode(base64Data, Base64.DEFAULT)
+                BitmapFactory.decodeByteArray(decodedString, 0, decodedString.size)
+            }
+            
+            bitmap?.let {
+                Image(
+                    bitmap = it.asImageBitmap(),
+                    contentDescription = "QR Code",
+                    modifier = Modifier
+                        .size(180.dp)
+                        .clip(RoundedCornerShape(8.dp))
+                        .background(Color.White)
+                        .padding(8.dp)
+                )
+            }
+        } else {
+            CircularProgressIndicator(modifier = Modifier.size(40.dp))
+        }
+        
+        Spacer(Modifier.height(24.dp))
+        
+        OutlinedTextField(
+            value = code,
+            onValueChange = { if (it.length <= 6) code = it },
+            placeholder = { Text("000000") },
+            modifier = Modifier.width(150.dp),
+            textStyle = MaterialTheme.typography.headlineMedium.copy(textAlign = TextAlign.Center),
+            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
+            shape = RoundedCornerShape(8.dp)
+        )
+
+        if (error != null) {
+            Text(error.lowercase(), color = Color.Red, style = MaterialTheme.typography.labelSmall, modifier = Modifier.padding(top = 8.dp))
+        }
+        
+        Spacer(Modifier.height(24.dp))
+        
+        Button(
+            onClick = { if (code.length == 6) onConfirm(code) },
+            enabled = code.length == 6,
+            modifier = Modifier.fillMaxWidth(),
+            shape = RoundedCornerShape(8.dp)
+        ) {
+            Text("confirm code")
+        }
+    }
+}

android/app/src/main/java/dev/zxq5/chatapp/android/model/ChatViewModel.kt

@@ -1,325 +0,0 @@
-package dev.zxq5.chatapp.android.model
-
-import android.util.Log
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewModelScope
-import dev.zxq5.chatapp.android.api.ApiClient
-import dev.zxq5.chatapp.android.core.error.ApiResult
-import dev.zxq5.chatapp.android.api.QrResponse
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.catch
-import kotlinx.coroutines.flow.filterNotNull
-import kotlinx.coroutines.flow.update
-import kotlinx.coroutines.launch
-
-enum class AuthMode {
-    LOGIN, SIGNUP
-}
-
-enum class MainScreen {
-    CHAT, SETTINGS
-}
-
-class ChatViewModel : ViewModel() {
-
-    private val _messages = MutableStateFlow<List<Message>>(emptyList())
-    val messages: StateFlow<List<Message>> = _messages
-
-    private val _channelId = MutableStateFlow<Int?>(null)
-    val channelId: StateFlow<Int?> = _channelId
-
-    private val _currentUserId = MutableStateFlow<Int?>(null)
-    val currentUserId: StateFlow<Int?> = _currentUserId
-
-    private val _currentScreen = MutableStateFlow(MainScreen.CHAT)
-    val currentScreen: StateFlow<MainScreen> = _currentScreen
-
-    val loginState = MutableStateFlow<LoginState>(LoginState.Idle)
-    
-    // Tracks whether the user is viewing the Login or Signup screen
-    val authMode = MutableStateFlow(AuthMode.LOGIN)
-
-    // 2FA state
-    private val _totpQr = MutableStateFlow<QrResponse?>(null)
-    val totpQr: StateFlow<QrResponse?> = _totpQr
-
-    private val _is2faEnabled = MutableStateFlow(false)
-    val is2faEnabled: StateFlow<Boolean> = _is2faEnabled
-
-    private val _totpError = MutableStateFlow<String?>(null)
-    val totpError: StateFlow<String?> = _totpError
-
-    // Settings state
-    private val _settingsError = MutableStateFlow<String?>(null)
-    val settingsError: StateFlow<String?> = _settingsError
-
-    private val _settingsSuccess = MutableStateFlow<String?>(null)
-    val settingsSuccess: StateFlow<String?> = _settingsSuccess
-
-    fun clearSettingsMessages() {
-        _settingsError.value = null
-        _settingsSuccess.value = null
-    }
-
-    fun clearTotpError() {
-        _totpError.value = null
-    }
-
-    private var streamJob: Job? = null
-
-    init {
-        initAuth(ApiClient.hasToken())
-    }
-    
-    fun initAuth(hasToken: Boolean) {
-        if (hasToken) {
-            val scope = ApiClient.getTokenScope()
-            if (scope == TokenScope.TOTP_PENDING) {
-                loginState.value = LoginState.TwoFactorRequired
-            } else if (scope == TokenScope.FULL) {
-                loginState.value = LoginState.Success
-                _currentUserId.value = ApiClient.getStoredUserId()
-                _is2faEnabled.value = ApiClient.is2faEnabledLocal()
-                fetchTotpStatus()
-                observeChannel()
-            } else {
-                loginState.value = LoginState.Error("Unknown token scope: $scope")
-            }
-        } else {
-            loginState.value = LoginState.Idle
-        }
-    }
-
-    private fun observeChannel() {
-        // restart stream whenever channel changes
-        viewModelScope.launch {
-            _channelId.filterNotNull().collect { id ->
-                streamJob?.cancel()
-                _messages.value = emptyList()
-                streamJob = launch {
-                    ApiClient.messageStream(id)
-                        .catch { e -> 
-                            Log.e("Chat", "Stream error", e)
-                        }
-                        .collect { message ->
-                            _messages.update { it + message }
-                        }
-                }
-            }
-        }
-    }
-
-    fun navigateTo(screen: MainScreen) {
-        _currentScreen.value = screen
-        if (screen == MainScreen.SETTINGS) {
-            fetchTotpStatus()
-        }
-    }
-
-    fun switchChannel(id: Int?) {
-        _channelId.value = id
-    }
-    
-    fun setAuthMode(mode: AuthMode) {
-        authMode.value = mode
-        // Clear errors when switching modes
-        if (loginState.value is LoginState.Error || loginState.value is LoginState.TwoFactorRequired) {
-            loginState.value = LoginState.Idle
-        }
-    }
-
-    fun sendMessage(text: String) {
-        val currentId = _channelId.value ?: return
-        viewModelScope.launch {
-            runCatching {
-                ApiClient.sendMessage(
-                    channelId = currentId,
-                    text = text
-                )
-            }.onFailure { e ->
-                Log.e("Chat", "Send message error", e)
-            }
-        }
-    }
-
-    fun login(username: String, password: String) {
-        viewModelScope.launch {
-            loginState.value = LoginState.Loading
-            when (val result = ApiClient.login(username, password)) {
-                is ApiResult.Success -> {
-                    when (val scope = ApiClient.getTokenScope()) {
-                        TokenScope.FULL -> {
-                            _currentUserId.value = ApiClient.getStoredUserId()
-                            _is2faEnabled.value = ApiClient.is2faEnabledLocal()
-                            loginState.value = LoginState.Success
-                            fetchTotpStatus()
-                            observeChannel()
-                        }
-                        TokenScope.TOTP_PENDING -> {
-                            loginState.value = LoginState.TwoFactorRequired
-                        }
-                        else -> {
-                            loginState.value = LoginState.Error("Unknown token scope: $scope")
-                        }
-                    }
-                }
-                is ApiResult.HttpError -> {
-                    loginState.value = LoginState.Error(result.message)
-                }
-                is ApiResult.NetworkError -> {
-                    loginState.value = LoginState.Error("Could not reach server: ${result.message}")
-                }
-            }
-        }
-    }
-
-    fun verifyLogin2fa(code: String) {
-        viewModelScope.launch {
-            loginState.value = LoginState.Loading
-            when (val result = ApiClient.verifyTotpLogin(code)) {
-                is ApiResult.Success -> {
-                    val scope = ApiClient.getTokenScope()
-                    if (scope == TokenScope.FULL) {
-                        _currentUserId.value = ApiClient.getStoredUserId()
-                        _is2faEnabled.value = ApiClient.is2faEnabledLocal()
-                        loginState.value = LoginState.Success
-                        fetchTotpStatus()
-                        observeChannel()
-                    } else {
-                        // token came back but scope is wrong — shouldn't happen
-                        loginState.value = LoginState.Error("Unexpected token scope after verification")
-                    }
-                }
-                is ApiResult.HttpError -> {
-                    // stay on TOTP screen but show the error
-                    loginState.value = LoginState.TwoFactorRequired
-                    // use a separate error signal so we don't lose the TOTP state
-                    _totpError.value = result.message
-                }
-                is ApiResult.NetworkError -> {
-                    loginState.value = LoginState.TwoFactorRequired
-                    _totpError.value = "Could not reach server: ${result.message}"
-                }
-            }
-        }
-    }
-    
-    fun signup(username: String, email: String, password: String, accessToken: String) {
-        viewModelScope.launch {
-            loginState.value = LoginState.Loading
-            try {
-
-                when (val result = ApiClient.signup(username, email, password, accessToken)) {
-                    is ApiResult.Success -> {
-                        _currentUserId.value = ApiClient.getStoredUserId()
-                        _is2faEnabled.value = ApiClient.is2faEnabledLocal()
-                        loginState.value = LoginState.Success
-                        observeChannel()
-                    }
-                    is ApiResult.HttpError -> {
-                        loginState.value = LoginState.Error(result.message)
-                    }
-                    is ApiResult.NetworkError -> {
-                        loginState.value = LoginState.Error("Could not reach server: ${result.message}")
-                    }
-                }
-            } catch (e: Exception) {
-                Log.e("Chat", "Signup error", e)
-                loginState.value = LoginState.Error("Signup failed: ${e.localizedMessage}")
-            }
-        }
-    }
-
-    fun logout() {
-        viewModelScope.launch {
-            ApiClient.logout()
-            _currentUserId.value = null
-            _is2faEnabled.value = false
-            loginState.value = LoginState.Idle
-            _messages.value = emptyList()
-            _channelId.value = null
-            _currentScreen.value = MainScreen.CHAT
-            streamJob?.cancel()
-        }
-    }
-
-    fun fetchTotpQr() {
-        viewModelScope.launch {
-            _totpQr.value = ApiClient.getTotpQr()
-        }
-    }
-
-    fun confirmTotp(code: String) {
-        viewModelScope.launch {
-            val success = ApiClient.confirmTotp(code)
-            if (success) {
-                _is2faEnabled.value = true
-                ApiClient.set2faEnabledLocal(true)
-                _totpQr.value = null
-            } else {
-                _totpError.value = "Invalid verification code"
-            }
-        }
-    }
-
-    fun fetchTotpStatus() {
-        viewModelScope.launch {
-            _is2faEnabled.value = ApiClient.getTotpStatus()
-        }
-    }
-
-    fun disableTotp() {
-        viewModelScope.launch {
-            when (val result = ApiClient.disableTotp()) {
-                is ApiResult.Success -> {
-                    _is2faEnabled.value = false
-                    _settingsSuccess.value = "2FA disabled successfully"
-                }
-                is ApiResult.HttpError -> {
-                    _settingsError.value = result.message
-                }
-                is ApiResult.NetworkError -> {
-                    _settingsError.value = "Network error: ${result.message}"
-                }
-            }
-        }
-    }
-
-    fun changePassword(old: String, new: String) {
-        viewModelScope.launch {
-            _settingsError.value = null
-            _settingsSuccess.value = null
-            when (val result = ApiClient.changePassword(old, new)) {
-                is ApiResult.Success -> {
-                    _settingsSuccess.value = "Password updated"
-                }
-                is ApiResult.HttpError -> {
-                    _settingsError.value = result.message
-                }
-                is ApiResult.NetworkError -> {
-                    _settingsError.value = "Network error: ${result.message}"
-                }
-            }
-        }
-    }
-
-    fun updateDisplayName(name: String?) {
-        viewModelScope.launch {
-            _settingsError.value = null
-            _settingsSuccess.value = null
-            val success = ApiClient.updateDisplayName(name)
-            if (success) {
-                _settingsSuccess.value = "Display name updated"
-            } else {
-                _settingsError.value = "Failed to update display name"
-            }
-        }
-    }
-}
-
-object TokenScope {
-    const val FULL = "full";
-    const val TOTP_PENDING = "totp_pending";
-}

android/app/src/main/java/dev/zxq5/chatapp/android/model/Message.kt

@@ -1,11 +0,0 @@
-package dev.zxq5.chatapp.android.model
-
-import kotlinx.serialization.Serializable
-
-@Serializable
-data class Message(
-    val user_id: Int,
-    val display_name: String,
-    val text: String,
-    val timestamp: Long
-)

android/app/src/main/java/dev/zxq5/chatapp/android/model/SendMessage.kt

@@ -1,10 +0,0 @@
-package dev.zxq5.chatapp.android.model
-
-import kotlinx.serialization.Serializable
-
-@Serializable
-data class SendMessage(
-    val user_id: Int,
-    val text: String,
-    val timestamp: Long
-)

android/app/src/main/java/dev/zxq5/chatapp/android/ui/components/login.kt

@@ -1,318 +0,0 @@
-package dev.zxq5.chatapp.android.ui.components
-
-import androidx.compose.foundation.background
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.text.KeyboardOptions
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.ArrowBack
-import androidx.compose.material3.Button
-import androidx.compose.material3.ButtonDefaults
-import androidx.compose.material3.CircularProgressIndicator
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedTextField
-import androidx.compose.material3.OutlinedTextFieldDefaults
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.style.TextAlign
-import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
-import dev.zxq5.chatapp.android.model.AuthMode
-import dev.zxq5.chatapp.android.model.ChatViewModel
-import dev.zxq5.chatapp.android.model.LoginState
-
-@Composable
-fun AuthScreen(viewModel: ChatViewModel, onSuccess: () -> Unit) {
-    val loginState by viewModel.loginState.collectAsState()
-    val authMode by viewModel.authMode.collectAsState()
-    val totpError by viewModel.totpError.collectAsState()
-
-    var username by remember { mutableStateOf("") }
-    var email by remember { mutableStateOf("") }
-    var password by remember { mutableStateOf("") }
-    var confirmPassword by remember { mutableStateOf("") }
-    var accessToken by remember { mutableStateOf("") }
-    var localError by remember { mutableStateOf<String?>(null) }
-
-
-
-    LaunchedEffect(loginState) {
-        if (loginState is LoginState.Success) onSuccess()
-    }
-
-    LaunchedEffect(authMode) {
-        localError = null
-    }
-
-    if (loginState is LoginState.TwoFactorRequired ||
-        (loginState is LoginState.Loading && totpError != null)) {
-        TwoFactorLoginScreen(
-            onVerify = { code -> viewModel.verifyLogin2fa(code) },
-            onBack = {
-                viewModel.clearTotpError()
-                viewModel.setAuthMode(AuthMode.LOGIN)
-            },
-            isLoading = loginState is LoginState.Loading,
-            error = totpError
-        )
-        return
-    }
-
-    Column(
-        modifier = Modifier
-            .fillMaxSize()
-            .background(MaterialTheme.colorScheme.background)
-            .padding(24.dp)
-            .verticalScroll(rememberScrollState()),
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
-        Spacer(Modifier.height(40.dp))
-        
-        Text(
-            text = "messenger",
-            style = MaterialTheme.typography.labelSmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-            modifier = Modifier.padding(bottom = 8.dp)
-        )
-
-        Text(
-            text = if (authMode == AuthMode.LOGIN) "welcome back" else "create account",
-            style = MaterialTheme.typography.headlineMedium,
-            color = MaterialTheme.colorScheme.onSurface,
-            modifier = Modifier.padding(bottom = 48.dp)
-        )
-
-        Column(
-            modifier = Modifier.fillMaxWidth(),
-            verticalArrangement = Arrangement.spacedBy(12.dp)
-        ) {
-            TextField(
-                value = username,
-                onValueChange = { username = it },
-                label = "username"
-            )
-
-            if (authMode == AuthMode.SIGNUP) {
-                TextField(
-                    value = email,
-                    onValueChange = { email = it },
-                    label = "email"
-                )
-            }
-
-            TextField(
-                value = password,
-                onValueChange = { password = it },
-                label = "password",
-                isPassword = true
-            )
-
-            if (authMode == AuthMode.SIGNUP) {
-                TextField(
-                    value = confirmPassword,
-                    onValueChange = { confirmPassword = it },
-                    label = "confirm password",
-                    isPassword = true
-                )
-                TextField(
-                    value = accessToken,
-                    onValueChange = { accessToken = it },
-                    label = "access token"
-                )
-            }
-        }
-
-        Spacer(Modifier.height(32.dp))
-
-        Button(
-            onClick = {
-                localError = null
-                if (authMode == AuthMode.LOGIN) {
-                    if (username.isBlank() || password.isBlank()) {
-                        localError = "fill all fields"
-                        return@Button
-                    }
-                    viewModel.login(username, password)
-                } else {
-                    if (username.isBlank() || email.isBlank() || password.isBlank() || accessToken.isBlank()) {
-                        localError = "fill all fields"
-                        return@Button
-                    }
-                    if (password != confirmPassword) {
-                        localError = "passwords mismatch"
-                        return@Button
-                    }
-                    viewModel.signup(username, email, password, accessToken)
-                }
-            },
-            enabled = loginState !is LoginState.Loading,
-            modifier = Modifier.fillMaxWidth(),
-            shape = RoundedCornerShape(8.dp),
-            colors = ButtonDefaults.buttonColors(
-                containerColor = MaterialTheme.colorScheme.primary,
-                contentColor = MaterialTheme.colorScheme.onPrimary,
-                disabledContainerColor = MaterialTheme.colorScheme.secondary
-            )
-        ) {
-            if (loginState is LoginState.Loading) {
-                CircularProgressIndicator(modifier = Modifier.size(16.dp), color = MaterialTheme.colorScheme.onPrimary, strokeWidth = 2.dp)
-            } else {
-                Text(
-                    if (authMode == AuthMode.LOGIN) "login" else "sign up",
-                    style = MaterialTheme.typography.bodyLarge
-                )
-            }
-        }
-
-        val displayError = localError ?: (loginState as? LoginState.Error)?.message
-        if (displayError != null) {
-            Text(
-                text = displayError.lowercase(),
-                style = MaterialTheme.typography.labelSmall,
-                color = Color.Red,
-                modifier = Modifier.padding(top = 16.dp)
-            )
-        }
-
-        Spacer(Modifier.height(16.dp))
-
-        TextButton(
-            onClick = {
-                viewModel.setAuthMode(if (authMode == AuthMode.LOGIN) AuthMode.SIGNUP else AuthMode.LOGIN)
-            }
-        ) {
-            Text(
-                if (authMode == AuthMode.LOGIN) "no account? sign up"
-                else "have account? login",
-                style = MaterialTheme.typography.labelSmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-        }
-    }
-}
-
-@Composable
-fun TwoFactorLoginScreen(
-    onVerify: (String) -> Unit,
-    onBack: () -> Unit,
-    isLoading: Boolean,
-    error: String?
-) {
-    var code by remember { mutableStateOf("") }
-
-    Column(
-        modifier = Modifier
-            .fillMaxSize()
-            .background(MaterialTheme.colorScheme.background)
-            .padding(24.dp),
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
-        Row(
-            modifier = Modifier.fillMaxWidth(),
-            verticalAlignment = Alignment.CenterVertically
-        ) {
-            IconButton(onClick = onBack) {
-                Icon(
-                    Icons.AutoMirrored.Filled.ArrowBack,
-                    contentDescription = "Back",
-                    tint = MaterialTheme.colorScheme.onSurfaceVariant
-                )
-            }
-            Text(
-                "security verification",
-                style = MaterialTheme.typography.labelSmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant
-            )
-        }
-
-        Spacer(Modifier.height(80.dp))
-
-        Text(
-            "two-factor auth",
-            style = MaterialTheme.typography.headlineMedium,
-            color = MaterialTheme.colorScheme.onSurface
-        )
-
-        Text(
-            "enter the 6-digit code from your app",
-            style = MaterialTheme.typography.labelSmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-            modifier = Modifier.padding(top = 8.dp, bottom = 48.dp)
-        )
-
-        OutlinedTextField(
-            value = code,
-            onValueChange = { if (it.length <= 6) code = it },
-            placeholder = { Text("000000", color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.3f)) },
-            modifier = Modifier.width(200.dp),
-            textStyle = MaterialTheme.typography.headlineMedium.copy(
-                textAlign = TextAlign.Center,
-                letterSpacing = 8.sp
-            ),
-            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
-            shape = RoundedCornerShape(8.dp),
-            colors = OutlinedTextFieldDefaults.colors(
-                focusedBorderColor = MaterialTheme.colorScheme.primary,
-                unfocusedBorderColor = MaterialTheme.colorScheme.outlineVariant,
-                focusedContainerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f),
-                unfocusedContainerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f)
-            ),
-            singleLine = true
-        )
-
-        if (error != null) {
-            Text(
-                text = error.lowercase(),
-                style = MaterialTheme.typography.labelSmall,
-                color = Color.Red,
-                modifier = Modifier.padding(top = 12.dp)
-            )
-        } else {
-            Spacer(Modifier.height(12.dp)) // keep layout stable when no error
-        }
-
-        Spacer(Modifier.height(36.dp))
-
-        Button(
-            onClick = { if (code.length == 6) onVerify(code) },
-            enabled = code.length == 6 && !isLoading,
-            modifier = Modifier.fillMaxWidth(),
-            shape = RoundedCornerShape(8.dp),
-            colors = ButtonDefaults.buttonColors(
-                containerColor = MaterialTheme.colorScheme.primary,
-                contentColor = MaterialTheme.colorScheme.onPrimary
-            )
-        ) {
-            if (isLoading) {
-                CircularProgressIndicator(modifier = Modifier.size(16.dp), color = MaterialTheme.colorScheme.onPrimary, strokeWidth = 2.dp)
-            } else {
-                Text("verify", style = MaterialTheme.typography.bodyLarge)
-            }
-        }
-    }
-}
-

android/app/src/main/java/dev/zxq5/chatapp/android/ui/components/settings.kt

@@ -1,368 +0,0 @@
-package dev.zxq5.chatapp.android.ui.components
-
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.background
-import androidx.compose.foundation.border
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.CircleShape
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.text.KeyboardOptions
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.ArrowBack
-import androidx.compose.material.icons.filled.Check
-import androidx.compose.material3.Button
-import androidx.compose.material3.ButtonDefaults
-import androidx.compose.material3.CircularProgressIndicator
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.HorizontalDivider
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.OutlinedTextField
-import androidx.compose.material3.OutlinedTextFieldDefaults
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Switch
-import androidx.compose.material3.SwitchDefaults
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.input.PasswordVisualTransformation
-import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
-import dev.zxq5.chatapp.android.model.ChatViewModel
-import dev.zxq5.chatapp.android.model.MainScreen
-import android.util.Base64
-import android.graphics.BitmapFactory
-import androidx.compose.runtime.LaunchedEffect
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun SettingsScreen(viewModel: ChatViewModel) {
-    val is2faEnabled by viewModel.is2faEnabled.collectAsState()
-    val totpQr by viewModel.totpQr.collectAsState()
-    val settingsError by viewModel.settingsError.collectAsState()
-    val settingsSuccess by viewModel.settingsSuccess.collectAsState()
-    
-    var show2faSetup by remember { mutableStateOf(false) }
-    var displayName by remember { mutableStateOf("") }
-    var oldPassword by remember { mutableStateOf("") }
-    var newPassword by remember { mutableStateOf("") }
-
-    LaunchedEffect(Unit) {
-        viewModel.clearSettingsMessages()
-        viewModel.fetchTotpStatus()
-    }
-
-    Scaffold(
-        containerColor = MaterialTheme.colorScheme.background,
-        topBar = {
-            TopAppBar(
-                title = { 
-                    Text(
-                        "settings", 
-                        style = MaterialTheme.typography.titleLarge,
-                        color = MaterialTheme.colorScheme.onSurface
-                    ) 
-                },
-                navigationIcon = {
-                    IconButton(onClick = { viewModel.navigateTo(MainScreen.CHAT) }) {
-                        Icon(
-                            Icons.AutoMirrored.Filled.ArrowBack, 
-                            contentDescription = "Back",
-                            tint = MaterialTheme.colorScheme.onSurfaceVariant
-                        )
-                    }
-                },
-                colors = TopAppBarDefaults.topAppBarColors(
-                    containerColor = Color.Transparent
-                )
-            )
-        }
-    ) { padding ->
-        Column(
-            modifier = Modifier
-                .padding(padding)
-                .fillMaxSize()
-                .verticalScroll(rememberScrollState())
-                .padding(20.dp),
-            verticalArrangement = Arrangement.spacedBy(24.dp)
-        ) {
-            if (settingsError != null) {
-                Text(settingsError!!, color = Color.Red, style = MaterialTheme.typography.bodySmall)
-            }
-            if (settingsSuccess != null) {
-                Text(settingsSuccess!!, color = Color.Green, style = MaterialTheme.typography.bodySmall)
-            }
-
-            // Profile Section
-            Column {
-                Text(
-                    "profile",
-                    style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                    modifier = Modifier.padding(bottom = 12.dp)
-                )
-                
-                OutlinedTextField(
-                    value = displayName,
-                    onValueChange = { displayName = it },
-                    label = { Text("display name") },
-                    modifier = Modifier.fillMaxWidth(),
-                    shape = RoundedCornerShape(8.dp),
-                    trailingIcon = {
-                        IconButton(onClick = { viewModel.updateDisplayName(displayName.ifBlank { null }) }) {
-                            Icon(Icons.Default.Check, "Save")
-                        }
-                    }
-                )
-            }
-
-            HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f))
-
-            // Security Section
-            Column {
-                Text(
-                    "account security",
-                    style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                    modifier = Modifier.padding(bottom = 12.dp)
-                )
-
-                Row(
-                    modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
-                    verticalAlignment = Alignment.CenterVertically
-                ) {
-                    Column(modifier = Modifier.weight(1f)) {
-                        Text(
-                            "two-factor authentication",
-                            style = MaterialTheme.typography.bodyLarge,
-                            color = MaterialTheme.colorScheme.onSurface
-                        )
-                        Text(
-                            if (is2faEnabled) "enabled" else "disabled",
-                            style = MaterialTheme.typography.labelSmall,
-                            color = if (is2faEnabled) Color.Green.copy(alpha = 0.7f) else MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
-                        )
-                    }
-                    
-                    if (!is2faEnabled) {
-                        Button(
-                            onClick = { 
-                                show2faSetup = true
-                                viewModel.fetchTotpQr()
-                            },
-                            shape = RoundedCornerShape(8.dp),
-                            colors = ButtonDefaults.buttonColors(
-                                containerColor = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.3f),
-                                contentColor = MaterialTheme.colorScheme.onSurface
-                            ),
-                            modifier = Modifier.height(32.dp)
-                        ) {
-                            Text("setup", style = MaterialTheme.typography.labelSmall)
-                        }
-                    } else {
-                        Button(
-                            onClick = { viewModel.disableTotp() },
-                            shape = RoundedCornerShape(8.dp),
-                            colors = ButtonDefaults.buttonColors(
-                                containerColor = Color.Red.copy(alpha = 0.1f),
-                                contentColor = Color.Red
-                            ),
-                            modifier = Modifier.height(32.dp)
-                        ) {
-                            Text("disable", style = MaterialTheme.typography.labelSmall)
-                        }
-                    }
-                }
-
-                if (show2faSetup && !is2faEnabled) {
-                    Spacer(Modifier.height(16.dp))
-                    TwoFactorSetup(
-                        qrCodeBase64 = totpQr?.qr_code,
-                        onConfirm = { code ->
-                            viewModel.confirmTotp(code)
-                        },
-                        onCancel = { show2faSetup = false }
-                    )
-                }
-
-                Spacer(Modifier.height(16.dp))
-
-                Text("change password", style = MaterialTheme.typography.bodyMedium, modifier = Modifier.padding(bottom = 8.dp))
-                OutlinedTextField(
-                    value = oldPassword,
-                    onValueChange = { oldPassword = it },
-                    label = { Text("old password") },
-                    visualTransformation = PasswordVisualTransformation(),
-                    modifier = Modifier.fillMaxWidth(),
-                    shape = RoundedCornerShape(8.dp)
-                )
-                Spacer(Modifier.height(8.dp))
-                OutlinedTextField(
-                    value = newPassword,
-                    onValueChange = { newPassword = it },
-                    label = { Text("new password") },
-                    visualTransformation = PasswordVisualTransformation(),
-                    modifier = Modifier.fillMaxWidth(),
-                    shape = RoundedCornerShape(8.dp)
-                )
-                Spacer(Modifier.height(12.dp))
-                Button(
-                    onClick = { 
-                        viewModel.changePassword(oldPassword, newPassword)
-                        oldPassword = ""
-                        newPassword = ""
-                    },
-                    modifier = Modifier.fillMaxWidth(),
-                    shape = RoundedCornerShape(8.dp),
-                    enabled = oldPassword.isNotEmpty() && newPassword.isNotEmpty()
-                ) {
-                    Text("update password")
-                }
-            }
-
-            HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.2f))
-
-            // Application Section
-            Column {
-                Text(
-                    "application",
-                    style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f),
-                    modifier = Modifier.padding(bottom = 12.dp)
-                )
-                
-                Button(
-                    onClick = { viewModel.logout() },
-                    modifier = Modifier.fillMaxWidth(),
-                    shape = RoundedCornerShape(8.dp),
-                    colors = ButtonDefaults.buttonColors(
-                        containerColor = Color.Red.copy(alpha = 0.1f),
-                        contentColor = Color.Red
-                    )
-                ) {
-                    Text("logout", style = MaterialTheme.typography.bodyLarge)
-                }
-            }
-        }
-    }
-}
-
-@Composable
-fun TwoFactorSetup(
-    qrCodeBase64: String?,
-    onConfirm: (String) -> Unit,
-    onCancel: () -> Unit
-) {
-    var code by remember { mutableStateOf("") }
-    
-    Column(
-        modifier = Modifier
-            .fillMaxWidth()
-            .border(0.5.dp, MaterialTheme.colorScheme.outlineVariant, RoundedCornerShape(12.dp))
-            .background(MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.1f), RoundedCornerShape(12.dp))
-            .padding(20.dp),
-        horizontalAlignment = Alignment.CenterHorizontally
-    ) {
-        Text(
-            "scan qr code",
-            style = MaterialTheme.typography.labelSmall,
-            color = MaterialTheme.colorScheme.onSurfaceVariant
-        )
-        
-        Spacer(Modifier.height(16.dp))
-        
-        if (qrCodeBase64 != null) {
-            val bitmap = remember(qrCodeBase64) {
-                val base64Data = qrCodeBase64.substringAfter("base64,")
-                val decodedString = Base64.decode(base64Data, Base64.DEFAULT)
-                BitmapFactory.decodeByteArray(decodedString, 0, decodedString.size)
-            }
-            
-            bitmap?.let {
-                Image(
-                    bitmap = it.asImageBitmap(),
-                    contentDescription = "QR Code",
-                    modifier = Modifier
-                        .size(180.dp)
-                        .clip(RoundedCornerShape(8.dp))
-                        .background(Color.White) // QR codes usually need white background
-                        .padding(8.dp)
-                )
-            }
-        } else {
-            Box(
-                modifier = Modifier.size(180.dp),
-                contentAlignment = Alignment.Center
-            ) {
-                CircularProgressIndicator(color = MaterialTheme.colorScheme.primary)
-            }
-        }
-        
-        Spacer(Modifier.height(24.dp))
-        
-        OutlinedTextField(
-            value = code,
-            onValueChange = { if (it.length <= 6) code = it },
-            placeholder = { Text("000000", color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.3f)) },
-            modifier = Modifier.width(150.dp),
-            textStyle = MaterialTheme.typography.headlineMedium.copy(
-                textAlign = androidx.compose.ui.text.style.TextAlign.Center,
-                letterSpacing = 4.sp
-            ),
-            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
-            shape = RoundedCornerShape(8.dp),
-            colors = OutlinedTextFieldDefaults.colors(
-                focusedBorderColor = MaterialTheme.colorScheme.primary,
-                unfocusedBorderColor = MaterialTheme.colorScheme.outlineVariant
-            )
-        )
-        
-        Spacer(Modifier.height(24.dp))
-        
-        Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
-            Button(
-                onClick = onCancel,
-                modifier = Modifier.weight(1f),
-                shape = RoundedCornerShape(8.dp),
-                colors = ButtonDefaults.buttonColors(containerColor = Color.Transparent, contentColor = MaterialTheme.colorScheme.onSurfaceVariant)
-            ) {
-                Text("cancel", style = MaterialTheme.typography.labelSmall)
-            }
-            
-            Button(
-                onClick = { if (code.length == 6) onConfirm(code) },
-                enabled = code.length == 6,
-                modifier = Modifier.weight(1f),
-                shape = RoundedCornerShape(8.dp)
-            ) {
-                Text("confirm", style = MaterialTheme.typography.labelSmall)
-            }
-        }
-    }
-}

android/app/src/main/res/drawable/ic_notification.xml

@@ -0,0 +1,5 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:autoMirrored="true" android:height="24dp" android:tint="#FFFFFF" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+      
+    <path android:fillColor="@android:color/white" android:pathData="M20,2L4,2c-1.1,0 -1.99,0.9 -1.99,2L2,22l4,-4h14c1.1,0 2,-0.9 2,-2L22,4c0,-1.1 -0.9,-2 -2,-2zM18,14L6,14v-2h12v2zM18,11L6,11L6,9h12v2zM18,8L6,8L6,6h12v2z"/>
+    
+</vector>

backend/.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

backend/.idea/backend.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="EMPTY_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

backend/.idea/dataSources.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="chatapp_dev@100.118.108.58" uuid="b14acf5d-6750-469b-8aea-59c8343eb11c">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://100.118.108.58:5432/chatapp_dev</jdbc-url>
+      <jdbc-additional-properties>
+        <property name="com.intellij.clouds.kubernetes.db.host.port" />
+        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
+        <property name="com.intellij.clouds.kubernetes.db.container.port" />
+      </jdbc-additional-properties>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

backend/.idea/data_source_mapping.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourcePerFileMappings">
+    <file url="file://$PROJECT_DIR$/sql/schema.sql" value="b14acf5d-6750-469b-8aea-59c8343eb11c" />
+    <file url="file://$PROJECT_DIR$/src/repo/user_repo.rs" value="b14acf5d-6750-469b-8aea-59c8343eb11c" />
+  </component>
+</project>

backend/.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Eslint" enabled="true" level="WARNING" enabled_by_default="true" />
+  </profile>
+</component>

backend/.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/backend.iml" filepath="$PROJECT_DIR$/.idea/backend.iml" />
+    </modules>
+  </component>
+</project>

backend/.idea/sqldialects.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/sql/schema.sql" dialect="PostgreSQL" />
+    <file url="PROJECT" dialect="PostgreSQL" />
+  </component>
+</project>

backend/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

backend/Cargo.toml

@@ -10,7 +10,7 @@ dotenv = "0.15.0"
 futures-util = "0.3.31"
 image = "0.25.8"
 jsonwebtoken = { version = "10.3.0", features = ["rust_crypto"] }
-rand = "0.9.2"
+rand = "0.8"
 redis = { version = "0.25.4", features = ["tokio-comp"] }
 reqwest = { version = "0.12.23", features = ["json"] }
 rocket = { version = "0.5.1", features = ["json", "secrets"] }
@@ -20,8 +20,11 @@ rocket_dyn_templates = { version = "0.2.0", features = ["tera"] }
 serde = { version = "1.0.228", features = ["derive"] }
 serde_json = "1.0.145"
 sha2 = "0.10.9"
-sqlx = { version = "0.7.4", features = ["macros", "time"] }
+sqlx = { version = "0.7.4", features = ["chrono", "macros", "postgres", "time"] }
 tokio = { version = "1.47.1", features = ["full"] }
 totp-rs = { version = "5.7.0", features = ["gen_secret", "qr", "rand"] }
 tracing = "0.1.44"
 uuid = { version = "1.18.1", features = ["v4"] }
+thiserror = "1.0.69"
+utoipa = { version = "5.4.0", features = ["rocket_extras", "chrono"] }
+clap = { version = "4.5", features = ["derive"] }

backend/migrations/20251001212022_prototype-v1.sql

@@ -1,49 +0,0 @@
--- Add migration script here
-CREATE TABLE users (
-    id SERIAL PRIMARY KEY,
-    username VARCHAR(50) UNIQUE NOT NULL,
-    password VARCHAR(50) NOT NULL,
-    display_name VARCHAR(50),
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE TABLE channels (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(50) NOT NULL,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
-);
-
-CREATE TABLE messages (
-    id SERIAL PRIMARY KEY,
-    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
-    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
-    content TEXT NOT NULL,
-    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
-    is_edited BOOLEAN DEFAULT FALSE
-);
-
-create table attachments (
-    id SERIAL PRIMARY KEY,
-    message_id INTEGER NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
-    path TEXT NOT NULL
-);
-
-CREATE INDEX idx_messages_channel_id ON messages (channel_id, id DESC);
-CREATE INDEX idx_new_messages ON messages(created_at DESC);
-
--- Create a function to update the updated_at timestamp
-CREATE OR REPLACE FUNCTION update_updated_at_column()
-RETURNS TRIGGER AS $$
-BEGIN
-    NEW.updated_at = CURRENT_TIMESTAMP;
-    RETURN NEW;
-END;
-$$ language 'plpgsql';
-
--- Create trigger for messages table
-CREATE TRIGGER update_messages_updated_at
-    BEFORE UPDATE ON messages
-    FOR EACH ROW
-    EXECUTE FUNCTION update_updated_at_column();

backend/migrations/20251005014201_session-tokens.sql

@@ -1,20 +0,0 @@
--- Add migration script here
-CREATE TABLE sessions (
-    id SERIAL PRIMARY KEY,
-    user_id INTEGER NOT NULL REFERENCES users(id),
-    token TEXT NOT NULL UNIQUE,
-    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    expires_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP + INTERVAL '7 days'
-);
-
-CREATE OR REPLACE FUNCTION cleanup_expired_sessions()
-RETURNS TRIGGER AS $$
-BEGIN
-  DELETE FROM sessions WHERE expires_at < NOW();
-  RETURN NULL;
-END;
-$$ LANGUAGE plpgsql;
-
-CREATE TRIGGER trigger_cleanup_sessions
-    AFTER INSERT ON sessions
-    EXECUTE FUNCTION cleanup_expired_sessions();

backend/migrations/20251009091103_auth-v2.sql

@@ -1,5 +0,0 @@
--- Add migration script here
-ALTER TABLE users ADD COLUMN email VARCHAR(100);
-ALTER TABLE users ADD COLUMN twofa_enabled BOOLEAN DEFAULT FALSE;
-ALTER TABLE users ADD COLUMN totp_secret VARCHAR(64);
-ALTER TABLE users ADD COLUMN updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP;

backend/migrations/20251010002253_auth-v3.sql

@@ -1,2 +0,0 @@
--- Add migration script here
-ALTER TABLE users ALTER COLUMN twofa_enabled SET NOT NULL;

backend/migrations/20251010231008_invite-codes.sql

@@ -1,18 +0,0 @@
--- Add migration script here
-CREATE TABLE access_codes (
-    -- identifiers
-    id SERIAL PRIMARY KEY,
-    creator_id INTEGER NOT NULL REFERENCES users(id),
-
-    -- code data
-    code VARCHAR(255) NOT NULL,
-    name VARCHAR(255) NOT NULL,
-
-    -- uses
-    uses INTEGER NOT NULL DEFAULT 0,
-    max_uses INTEGER NOT NULL DEFAULT 1,
-
-    -- time data
-    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    expires_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP + INTERVAL '1 day'
-);

backend/migrations/20251011002049_invite-codes-v2.sql

@@ -1,10 +0,0 @@
--- Add migration script here
-ALTER TABLE access_codes
-ALTER COLUMN created_at
-TYPE TIMESTAMP WITH TIME ZONE
-USING created_at AT TIME ZONE 'UTC';
-
-ALTER TABLE access_codes
-ALTER COLUMN expires_at
-TYPE TIMESTAMP WITH TIME ZONE
-USING expires_at AT TIME ZONE 'UTC';

backend/migrations/20260331174422_password-hashing.sql

@@ -1,6 +0,0 @@
--- Add migration script here
-TRUNCATE TABLE users CASCADE;
-
-ALTER TABLE users DROP COLUMN password;
-ALTER TABLE users ADD COLUMN pass_hash VARCHAR(255) NOT NULL;
-ALTER TABLE users ADD CONSTRAINT users_username_unique UNIQUE (username);

backend/migrations/20260331222425_friends.sql

@@ -1,13 +0,0 @@
--- Add migration script here
-CREATE TYPE status AS ENUM ('pending', 'accepted', 'blocked');
-
-CREATE TABLE relationships (
-    id          SERIAL PRIMARY KEY,
-    from_user   INTEGER NOT NULL REFERENCES users(id),
-    to_user     INTEGER NOT NULL REFERENCES users(id),
-    status      status NOT NULL DEFAULT 'pending',
-    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
-    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
-    CONSTRAINT no_self_relationship CHECK (from_user != to_user),
-    CONSTRAINT unique_relationship UNIQUE (from_user, to_user)
-);

backend/migrations/20260405234237_v0.4.0.sql

@@ -0,0 +1,183 @@
+-- Add migration script here
+-- Add migration script here
+CREATE TYPE user_role AS ENUM ('user', 'admin');
+CREATE TYPE totp_status AS ENUM ('disabled', 'pending', 'enabled');
+
+CREATE TABLE users (
+    id BIGSERIAL PRIMARY KEY NOT NULL,
+    role user_role NOT NULL DEFAULT 'user',
+
+    -- profile
+    nickname VARCHAR(255),
+
+    -- basic auth
+    username VARCHAR(255) UNIQUE NOT NULL,
+    passhash VARCHAR(255) NOT NULL,
+
+    -- email
+    email VARCHAR(255),
+    email_verified BOOLEAN DEFAULT FALSE,
+
+    -- 2fa
+    totp_secret VARCHAR(255),
+    totp_status totp_status NOT NULL DEFAULT 'disabled',
+
+    -- update tracking
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    deleted_at TIMESTAMPTZ
+);
+
+CREATE TABLE access_tokens (
+    id BIGSERIAL PRIMARY KEY NOT NULL,
+    creator_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+
+    code VARCHAR(255) NOT NULL,
+    name VARCHAR(255) NOT NULL,
+
+    uses INTEGER NOT NULL DEFAULT 0,
+    max_uses INTEGER NOT NULL DEFAULT 1,
+
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at TIMESTAMPTZ NOT NULL DEFAULT NOW() + INTERVAL '24 hours',
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE refresh_tokens (
+    id          BIGSERIAL PRIMARY KEY NOT NULL,
+    user_id     BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash  VARCHAR(255) NOT NULL,
+
+    revoked     BOOLEAN NOT NULL DEFAULT FALSE,
+
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    expires_at  TIMESTAMPTZ NOT NULL DEFAULT NOW() + INTERVAL '7 days'
+);
+
+
+CREATE TABLE spaces (
+    id BIGSERIAL PRIMARY KEY NOT NULL,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+
+    owner_id BIGINT NOT NULL REFERENCES users(id),
+
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE channels (
+    id BIGSERIAL PRIMARY KEY NOT NULL,
+    name VARCHAR(255) NOT NULL,
+    description TEXT,
+
+    space_id BIGINT NOT NULL REFERENCES spaces(id) ON DELETE CASCADE,
+
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+
+CREATE TABLE space_members (
+    space_id BIGINT NOT NULL REFERENCES spaces(id) ON DELETE CASCADE,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+
+    joined_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    role user_role DEFAULT 'user',
+
+    PRIMARY KEY (space_id, user_id)
+);
+
+CREATE TABLE messages (
+    id BIGSERIAL PRIMARY KEY NOT NULL,
+    channel_id BIGINT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    content TEXT NOT NULL,
+
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    is_edited BOOLEAN DEFAULT FALSE
+);
+
+CREATE TABLE attachments (
+    id           BIGSERIAL    PRIMARY KEY NOT NULL,
+    message_id   BIGINT       NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
+    filename     VARCHAR(255) NOT NULL,
+    content_type VARCHAR(100) NOT NULL,  -- mime type e.g. image/png, video/mp4
+    size_bytes   BIGINT       NOT NULL,
+    url          TEXT         NOT NULL,   -- path to file on your CDN/storage
+    width        INTEGER,                 -- null for non-image/video
+    height       INTEGER,                 -- null for non-image/video
+    duration_ms  INTEGER,                 -- null for non-audio/video
+    created_at   TIMESTAMPTZ  NOT NULL DEFAULT NOW()
+);
+
+CREATE TYPE relationship_status AS ENUM ('pending', 'accepted', 'blocked');
+
+CREATE TABLE relationships (
+    id          BIGSERIAL PRIMARY KEY NOT NULL,
+
+    from_user   BIGINT NOT NULL REFERENCES users(id),
+    to_user     BIGINT NOT NULL REFERENCES users(id),
+    status      relationship_status NOT NULL DEFAULT 'pending',
+
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT no_self_relationship CHECK (from_user != to_user),
+    CONSTRAINT unique_relationship  UNIQUE (from_user, to_user)
+);
+
+CREATE INDEX idx_messages_channel_id   ON messages(channel_id, created_at DESC);
+CREATE INDEX idx_messages_user_id      ON messages(user_id);
+CREATE INDEX idx_attachments_message   ON attachments(message_id);
+CREATE INDEX idx_channels_space_id     ON channels(space_id);
+CREATE INDEX idx_space_members_user    ON space_members(user_id);
+CREATE INDEX idx_refresh_tokens_hash   ON refresh_tokens(token_hash);
+CREATE INDEX idx_relationships_from    ON relationships(from_user, to_user);
+CREATE INDEX idx_relationships_to      ON relationships(to_user);
+CREATE INDEX idx_access_tokens_code    ON access_tokens(code);
+
+CREATE OR REPLACE FUNCTION update_updated_at()
+    RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER users_updated_at
+    BEFORE UPDATE ON users
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE TRIGGER spaces_updated_at
+    BEFORE UPDATE ON spaces
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE TRIGGER channels_updated_at
+    BEFORE UPDATE ON channels
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE TRIGGER messages_updated_at
+    BEFORE UPDATE ON messages
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE TRIGGER relationships_updated_at
+    BEFORE UPDATE ON relationships
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE TRIGGER access_tokens_updated_at
+    BEFORE UPDATE ON access_tokens
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at();
+
+CREATE OR REPLACE FUNCTION add_owner_to_space()
+    RETURNS TRIGGER AS $$
+BEGIN
+    INSERT INTO space_members (space_id, user_id, role, joined_at)
+    VALUES (NEW.id, NEW.owner_id, 'admin', NOW());
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER space_owner_becomes_member
+    AFTER INSERT ON spaces
+    FOR EACH ROW EXECUTE FUNCTION add_owner_to_space();

backend/src/api/auth.rs

@@ -1,21 +1,46 @@
-use std::{
-    sync::LazyLock,
-    time::{SystemTime, UNIX_EPOCH},
-};
+use crate::error::ApiResult;
+use crate::model::auth::{AccessTokenForm, AuthResponse, LoginCredentials, SignupCredentials};
+use crate::svc::auth_svc::AuthService;
+use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
+use rocket::http::Status;
+use rocket::request::{FromRequest, Outcome};
+use rocket::serde::json::Json;
+use rocket::serde::{Deserialize, Serialize};
+use rocket::{Request, State};
+use std::sync::LazyLock;
+use std::time::{SystemTime, UNIX_EPOCH};
+use crate::svc::access_token_svc::AccessTokenService;
 
-use jsonwebtoken::{DecodingKey, EncodingKey, Header, Validation, decode, encode};
-use rand::Rng;
-use rocket::{
-    Request,
-    http::Status,
-    request::{self, FromRequest, Outcome},
-};
-use rocket_db_pools::Connection;
-use serde::{Deserialize, Serialize};
-use sha2::{Digest, Sha256, digest::block_buffer::Lazy};
-use sqlx::postgres::PgQueryResult;
+#[post("/signup", data = "<cred>")]
+pub async fn signup(
+    cred: Json<SignupCredentials>,
+    svc: &State<AuthService>
+) -> ApiResult<Json<AuthResponse>> {
+    let response = svc
+        .signup(
+            &cred.email, &cred.username, &cred.password, &cred.access_token,
+        ).await?;
+    Ok(Json(response))
+}
 
-use crate::db::Postgres;
+#[post("/login", data = "<cred>")]
+pub async fn login(
+    cred: Json<LoginCredentials>,
+    svc: &State<AuthService>
+) -> ApiResult<Json<AuthResponse>> {
+    Ok(Json(svc.login(&cred.username, &cred.password).await?))
+}
+
+#[post("/invite", data = "<form>")]
+pub async fn generate_invite(
+    session: Session,
+    form: Json<AccessTokenForm>,
+    svc: &State<AccessTokenService>
+) -> ApiResult<String> {
+    svc.create(
+        session.uid, &form.name, form.max_uses,
+        form.start_date, form.expiry_date).await
+}
 
 static JWT_SECRET: LazyLock<String> = LazyLock::new(|| std::env::var("JWT_SECRET").unwrap());
 
@@ -27,7 +52,7 @@ pub enum TokenScope {
 }
 
 pub struct Session {
-    pub user_id: usize,
+    pub uid: i64,
 }
 
 #[rocket::async_trait]
@@ -37,7 +62,7 @@ impl<'r> FromRequest<'r> for Session {
     async fn from_request(req: &'r Request<'_>) -> Outcome<Self, Self::Error> {
         match Claims::from_request(req).await {
             Outcome::Success(user) if user.scope == TokenScope::Full => Outcome::Success(Session {
-                user_id: user.sub as usize,
+                uid: user.sub as i64,
             }),
             Outcome::Success(_) => {
                 eprintln!("warning: user with scope other than Full attempted to access session");

backend/src/api/cdn.rs

@@ -26,7 +26,7 @@ pub async fn profile_pic(user_id: usize) -> Option<NamedFile> {
         Some(image)
     } else {
         Some(
-            NamedFile::open("./cdn/profiles/full/default.svg")
+            NamedFile::open("../../cdn/profiles/full/default.svg")
                 .await
                 .ok()?,
         )

backend/src/api/chat.rs

@@ -0,0 +1,70 @@
+use crate::api::auth::Session;
+use crate::error::ApiResult;
+use crate::svc::chat_svc::ChatService;
+use chrono::{DateTime, Utc};
+use rocket::response::stream::Event;
+use rocket::serde::json::Json;
+use rocket::serde::{Deserialize, Serialize};
+use rocket::{Shutdown, State, ___internal_EventStream as EventStream};
+use sqlx::FromRow;
+use tokio::select;
+use tokio::sync::broadcast;
+
+/// ---------- Rocket routes ----------
+#[derive(Debug, Serialize, Deserialize, Clone, FromRow)]
+pub struct ChatMsg {
+    pub display_name: Option<String>,
+    pub user_id: i64,
+    pub text: String,
+    pub timestamp: DateTime<Utc>,
+}
+
+#[post("/chat/<channel_id>", format = "json", data = "<msg>")]
+pub async fn post_message(
+    msg: Json<ChatMsg>,
+    chat: &State<ChatService>,
+    session: Session,
+    channel_id: i64,
+) -> ApiResult<()> {
+    chat.send(channel_id, session.uid, &msg.text, Utc::now()).await
+}
+
+#[get("/events/<channel_id>")]
+pub async fn event_stream(
+    chat: &State<ChatService>,
+    s: Session,
+    mut shutdown: Shutdown,
+    channel_id: i64,
+) -> ApiResult<EventStream![]> {
+    let messages = chat.get_messages(channel_id, 100)
+        .await?; // if get message returned err, inform user.
+
+    let mut rx = chat.subscribe(channel_id).await;
+    let id = s.uid;
+
+    Ok(EventStream! {
+        for msg in messages {
+            yield Event::json(&msg);
+        }
+
+        loop {
+            select!{
+                _ = &mut shutdown => break, // exit early on shutdown
+                msg = rx.recv() => match msg {
+                    Ok(msg) => {
+                        tracing::info!("yielding message!");
+                        yield Event::json(&msg)
+                    },
+                    Err(broadcast::error::RecvError::Lagged(n)) => {
+                        tracing::warn!("Receiver lagging on channel {channel_id} by {n} events",);
+                        yield Event::comment("RecvError::Lagged");
+                    }
+                    Err(broadcast::error::RecvError::Closed) => {
+                        tracing::info!("Broadcaster hung up on channel {channel_id}!");
+                        break
+                    },
+                },
+            }
+        }
+    })
+}

backend/src/api/mod.rs

@@ -0,0 +1,7 @@
+pub mod auth;
+pub mod chat;
+pub mod totp;
+pub mod settings;
+pub mod cdn;
+pub mod profile;
+pub mod space;

backend/src/api/profile.rs

@@ -0,0 +1,13 @@
+use rocket::State;
+use crate::api::auth::Session;
+use crate::error::ApiResult;
+use crate::svc::user_svc::UserService;
+
+#[get("/users/<id>")]
+pub async fn display_name(
+	id: i64,
+	_ag: Session,
+	svc: &State<UserService>,
+) -> ApiResult<String> {
+	svc.get_username(id).await
+}

backend/src/api/settings.rs

@@ -0,0 +1,68 @@
+use crate::api::auth::Session;
+use crate::error::ApiResult;
+use crate::svc::settings_svc::SettingsService;
+use rocket::serde::json::Json;
+use rocket::serde::{Deserialize, Serialize};
+use rocket::State;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct PasswordForm {
+    pub old_password: String,
+    pub new_password: String,
+}
+
+#[post("/settings/password", data = "<form>")]
+pub async fn change_password(
+    session: Session,
+    form: Json<PasswordForm>,
+    settings: &State<SettingsService>
+) -> ApiResult<()> {
+    settings.change_password(
+        session.uid, &form.old_password, &form.new_password
+    ).await
+}
+
+#[derive(Deserialize, Debug, Clone)]
+pub struct DisplayNameForm {
+    pub display_name: Option<String>,
+}
+
+#[derive(Deserialize, Debug, Clone)]
+pub struct PasswordAnd2faForm {
+    pub password: String,
+    pub totp_code: Option<String>,
+}
+
+#[delete("/settings", data = "<data>")]
+pub async fn delete_account(
+    session: Session,
+    data: Json<PasswordAnd2faForm>,
+    settings: &State<SettingsService>
+) -> ApiResult<()> {
+    settings.delete_account(
+        session.uid, &data.password, &data.totp_code
+    ).await
+}
+
+#[patch("/settings/display_name", data = "<new>")]
+pub async fn change_display_name(
+    session: Session,
+    new: Json<DisplayNameForm>,
+    settings: &State<SettingsService>
+) -> ApiResult<()> {
+    settings.change_display_name(session.uid, new.display_name.clone()).await
+}
+
+#[derive(Deserialize)]
+pub struct UsernameForm {
+    pub username: String,
+}
+
+#[patch("/settings/username", data = "<new>")]
+pub async fn change_username(
+    session: Session,
+    new: Json<UsernameForm>,
+    settings: &State<SettingsService>
+) -> ApiResult<()> {
+    settings.change_username(session.uid, &new.username).await
+}

backend/src/api/space.rs

@@ -0,0 +1,36 @@
+use crate::error::ApiResult;
+use crate::model::space::{Space, SpaceDto};
+use crate::model::space::Channel;
+use crate::repo::{SpaceRepo, ChannelRepo};
+use rocket::serde::json::Json;
+use rocket::State;
+use std::sync::Arc;
+use crate::api::auth::Session;
+use crate::svc::chat_svc::ChatService;
+
+#[get("/spaces")]
+pub async fn list_spaces(
+    space_repo: &State<Arc<dyn SpaceRepo>>
+) -> ApiResult<Json<Vec<Space>>> {
+    let spaces = space_repo.get_all().await?;
+    Ok(Json(spaces))
+}
+
+#[get("/spaces/<space_id>/channels")]
+pub async fn list_channels(
+    space_id: i64,
+    channel_repo: &State<Arc<dyn ChannelRepo>>
+) -> ApiResult<Json<Vec<Channel>>> {
+    let channels = channel_repo.get_by_space_id(space_id).await?;
+    Ok(Json(channels))
+}
+
+#[get("/accessible_channels")]
+pub async fn get_accessible_channels(
+    session: Session,
+    svc: &State<ChatService>
+) -> ApiResult<Json<Vec<SpaceDto>>> {
+    let space = svc.get_accessible_channels(session.uid).await?;
+    println!("{:?}", space);
+    Ok(Json(space))
+}

backend/src/api/totp.rs

@@ -0,0 +1,120 @@
+use crate::api::auth::{Claims, Session, TokenScope};
+use crate::error::{ApiResult, AppError};
+use crate::model::auth::AuthResponse;
+use crate::svc::auth_svc::AuthService;
+use rocket::serde::json::Json;
+use rocket::serde::{Deserialize, Serialize};
+use rocket::State;
+use totp_rs::{Algorithm, TOTP};
+
+#[derive(Debug, Deserialize)]
+pub struct TOTPSixDigitCode {
+    code: String,
+}
+
+#[derive(Debug, sqlx::Type, Clone, Copy, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "snake_case")]
+#[sqlx(type_name = "totp_status", rename_all = "lowercase")]
+pub enum TotpStatus {
+    Enabled,
+    Pending,
+    Disabled,
+}
+
+#[derive(Serialize)]
+pub struct QrResponse {
+    qr_code: String,
+}
+
+#[derive(Deserialize)]
+pub struct TotpVerifyRequest {
+    pub code: String,
+}
+
+#[derive(Deserialize)]
+pub struct PasswordConfirmation {
+    password: String,
+}
+
+#[derive(Deserialize)]
+pub struct PasswordAnd2fa {
+    pub password: String,
+    pub totp_code: String,
+}
+
+pub fn totp_gen(user_id: i64, secret: &[u8]) -> ApiResult<TOTP> {
+    TOTP::new(
+        Algorithm::SHA1,
+        6,
+        1,
+        30,
+        secret.to_owned(),
+        Some("chat.zxq5.dev".to_string()),
+        format!("{}", user_id),
+    )
+    .map_err(|_| AppError::internal("failed to generate totp"))
+}
+
+#[post("/totp", data = "<form>")]
+pub async fn confirm_totp(
+    user: Session,
+    form: Json<TOTPSixDigitCode>,
+    svc: &State<AuthService>,
+) -> ApiResult<()> {
+    svc.confirm_totp(user.uid, &form.code).await
+}
+
+#[post("/totp.jpg", data = "<form>")]
+pub async fn get_totp(
+    user: Session,
+    form: Json<PasswordConfirmation>,
+    svc: &State<AuthService>,
+) -> ApiResult<Json<QrResponse>> {
+    let secret = svc.get_or_create_totp_secret(user.uid, &form.password).await?;
+
+    let qr_b64 = totp_gen(user.uid, secret.as_bytes())
+        .map_err(|_| AppError::internal("invalid totp secret"))?
+        .get_qr_base64()
+        .map_err(|_| AppError::internal("failed to generate qr code"))?;
+
+    Ok(Json(QrResponse {
+        qr_code: format!("data:image/png;base64,{}", qr_b64),
+    }))
+}
+
+#[get("/totp/status")]
+pub async fn get_totp_status(
+    user: Session,
+    svc: &State<AuthService>,
+) -> ApiResult<Json<TotpStatus>> {
+    Ok(Json(
+        svc.get_totp_status(user.uid).await?
+            .then_some(TotpStatus::Enabled)
+            .unwrap_or(TotpStatus::Disabled),
+    ))
+}
+
+#[delete("/totp", data = "<form>")]
+pub async fn disable_totp(
+    user: Session,
+    form: Json<PasswordAnd2fa>,
+    svc: &State<AuthService>,
+) -> ApiResult<Json<AuthResponse>> {
+    let response = svc.disable_totp(user.uid, &form.password, &form.totp_code).await?;
+    Ok(Json(response))
+}
+
+#[post("/totp/verify", data = "<body>")]
+pub async fn verify_totp(
+    claims: Claims,
+    body: Json<TotpVerifyRequest>,
+    svc: &State<AuthService>,
+) -> ApiResult<Json<AuthResponse>> {
+    // reject if they somehow got here with a full token
+    if claims.scope != TokenScope::TotpPending {
+        return Err(AppError::Forbidden);
+    }
+
+    let response = svc.login_totp(claims.sub as i64, &body.code).await?;
+    Ok(Json(response))
+}

backend/src/auth/account.rs

@@ -1,211 +0,0 @@
-use argon2::{
-    Argon2, PasswordHash, PasswordHasher, PasswordVerifier,
-    password_hash::{SaltString, rand_core::OsRng},
-};
-use jsonwebtoken::{EncodingKey, Header, encode};
-use rocket::{
-    http::{CookieJar, Status},
-    response::{Redirect, status::BadRequest},
-    serde::json::Json,
-    time::OffsetDateTime,
-};
-use rocket_db_pools::Connection;
-use rocket_dyn_templates::{Template, context};
-use serde::{Deserialize, Serialize};
-use uuid::Uuid;
-
-use crate::{
-    auth::session::{Claims, Session, TokenScope},
-    db::Postgres,
-    user::User,
-};
-
-#[derive(Serialize, Deserialize)]
-pub struct SignupCredentials {
-    pub email: String,
-    pub username: String,
-    pub password: String,
-    pub access_token: String,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct LoginCredentials {
-    pub username: String,
-    pub password: String,
-}
-
-#[derive(Serialize, Deserialize)]
-pub struct AuthResponse {
-    pub token: String,
-    pub totp_required: bool,
-}
-
-#[get("/signup")]
-pub async fn signup_page() -> Template {
-    Template::render("signup", context!())
-}
-
-#[post("/signup", data = "<cred>")]
-pub async fn signup(
-    cred: Json<SignupCredentials>,
-    jar: &CookieJar<'_>,
-    mut db: Connection<Postgres>,
-) -> Result<Json<AuthResponse>, Status> {
-    let token_id = AccessToken::validate(&cred.access_token, &mut db)
-        .await
-        .map_err(|_| Status::Unauthorized)?;
-
-    let salt = SaltString::generate(&mut OsRng);
-    let hashed = Argon2::default()
-        .hash_password(cred.password.as_bytes(), &salt)
-        .map_err(|_| Status::InternalServerError)?
-        .to_string();
-
-    let result = sqlx::query!(
-        "INSERT INTO users (email, username, pass_hash) VALUES ($1, $2, $3) RETURNING id",
-        cred.email,
-        cred.username,
-        hashed,
-    )
-    .fetch_one(&mut **db)
-    .await
-    .map_err(|_| Status::InternalServerError)?;
-
-    let jwt = Claims::new(result.id as usize, TokenScope::Full).encode();
-
-    token_id
-        .use_token(&mut db)
-        .await
-        .expect("unable to use access code");
-
-    Ok(Json(AuthResponse {
-        token: jwt,
-        totp_required: false,
-    }))
-}
-
-#[get("/login")]
-pub async fn login_page() -> Template {
-    Template::render("login", context!())
-}
-
-#[post("/login", data = "<cred>")]
-pub async fn login(
-    mut db: Connection<Postgres>,
-    cred: Json<LoginCredentials>,
-) -> Result<Json<AuthResponse>, Status> {
-    println!("e");
-    let row = sqlx::query!(
-        "SELECT id, pass_hash, twofa_enabled FROM users WHERE username = $1",
-        cred.username,
-    )
-    .fetch_one(&mut **db)
-    .await
-    .map_err(|_| Status::Unauthorized)?;
-
-    println!("ok");
-
-    // verify password as before
-    let parsed_hash = PasswordHash::new(&row.pass_hash).map_err(|_| Status::InternalServerError)?;
-    Argon2::default()
-        .verify_password(cred.password.as_bytes(), &parsed_hash)
-        .map_err(|_| Status::Unauthorized)?;
-
-    println!("ok2");
-
-    let user_id = row.id as usize;
-
-    // issue either a partial or full token depending on 2FA status
-    let (session, totp_required) = if row.twofa_enabled {
-        (Claims::new(user_id, TokenScope::TotpPending), true)
-    } else {
-        (Claims::new(user_id, TokenScope::Full), false)
-    };
-
-    Ok(Json(AuthResponse {
-        token: session.encode(),
-        totp_required,
-    }))
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct AccessTokenForm {
-    pub name: String,
-    pub max_uses: usize,
-    pub expiry_date: usize,
-    pub start_date: usize,
-}
-
-#[get("/invite")]
-pub async fn invite_page(_s: Session) -> Template {
-    Template::render("invite", context! {})
-}
-
-#[post("/invite", data = "<form>")]
-pub async fn generate_invite(
-    session: Session,
-    mut db: Connection<Postgres>,
-    form: Json<AccessTokenForm>,
-) -> Result<String, Status> {
-    if form.start_date > form.expiry_date {
-        return Err(Status::BadRequest);
-    }
-
-    let code = Uuid::new_v4().to_string();
-    sqlx::query!(
-        "INSERT INTO access_codes (name, code, creator_id, max_uses, created_at, expires_at)
-        VALUES ($1, $2, $3, $4, $5, $6) RETURNING id",
-        form.name,
-        code,
-        session.user_id as i32,
-        form.max_uses as i32,
-        OffsetDateTime::from_unix_timestamp_nanos(form.start_date as i128 * 1_000_000).unwrap(),
-        OffsetDateTime::from_unix_timestamp_nanos(form.expiry_date as i128 * 1_000_000).unwrap()
-    )
-    .fetch_one(&mut **db)
-    .await
-    .map_err(|_| Status::InternalServerError)?;
-
-    Ok(code)
-}
-
-pub struct AccessToken {
-    id: i32,
-    _code: String,
-}
-
-impl AccessToken {
-    pub async fn validate(
-        token: &str,
-        db: &mut Connection<Postgres>,
-    ) -> Result<AccessToken, String> {
-        match sqlx::query!(
-            "SELECT id FROM access_codes
-                WHERE code = $1
-                AND created_at < NOW()
-                AND expires_at > NOW()
-                AND uses < max_uses",
-            token
-        )
-        .fetch_one(&mut ***db)
-        .await
-        {
-            Ok(row) => Ok(AccessToken {
-                id: row.id,
-                _code: token.to_string(),
-            }),
-            Err(_) => Err(String::from("Invalid or Expired token!")),
-        }
-    }
-
-    pub async fn use_token(&self, db: &mut Connection<Postgres>) -> Result<(), String> {
-        sqlx::query!(
-            "UPDATE access_codes SET uses = uses + 1 WHERE id = $1",
-            self.id
-        )
-        .execute(&mut ***db)
-        .await
-        .map_err(|_| String::from("Invalid or Expired token!"))?;
-        Ok(())
-    }
-}

backend/src/auth/mod.rs

@@ -1,12 +0,0 @@
-pub mod account;
-pub mod profile;
-pub mod session;
-pub mod two_factor;
-
-pub use session::Session;
-
-pub use account::{generate_invite, invite_page, login, login_page, signup, signup_page};
-pub use profile::{change_display_name, change_password};
-pub use two_factor::{
-    confirm_totp, disable_totp, get_totp, get_totp_status, mfa_page, verify_totp,
-};

backend/src/auth/profile.rs

@@ -1,84 +0,0 @@
-use argon2::{
-    Argon2, PasswordHash, PasswordHasher, PasswordVerifier,
-    password_hash::{SaltString, rand_core::OsRng},
-};
-use rocket::{http::Status, serde::json::Json};
-use rocket_db_pools::Connection;
-use serde::{Deserialize, Serialize};
-
-use crate::{auth::Session, db::Postgres, user::User};
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct PasswordForm {
-    old_password: String,
-    new_password: String,
-}
-
-#[post("/settings/password", data = "<form>")]
-pub async fn change_password(
-    session: Session,
-    mut db: Connection<Postgres>,
-    form: Json<PasswordForm>,
-) -> Result<(), Status> {
-    let mut user = User::get_by_id(session.user_id, &mut db)
-        .await
-        .ok_or(Status::NotFound)
-        .inspect_err(|_| {
-            tracing::error!(
-                "Valid session does not have a valid user. ID: {}",
-                session.user_id
-            )
-        })?;
-
-    let parsed_hash = PasswordHash::new(&user.pass_hash)
-        .inspect_err(|e| tracing::error!("Failed to parse hash for password! uid:{} {e}", user.id))
-        .map_err(|_| Status::InternalServerError)?;
-
-    Argon2::default()
-        .verify_password(form.old_password.as_bytes(), &parsed_hash)
-        .map_err(|_| Status::Unauthorized)?;
-
-    // old password is correct, so new one can be set.
-    let salt = SaltString::generate(&mut OsRng);
-    let hashed = Argon2::default()
-        .hash_password(form.new_password.as_bytes(), &salt)
-        .inspect_err(|e| tracing::error!("failed to hash password! {e}"))
-        .map_err(|_| Status::InternalServerError)?
-        .to_string();
-
-    user.set_pass_hash(hashed, &mut db)
-        .await
-        .inspect_err(|e| tracing::error!("{e}"))
-        .map_err(|_| Status::InternalServerError)?;
-
-    Ok(())
-}
-
-#[derive(Deserialize, Debug, Clone)]
-pub struct DisplayNameForm {
-    pub display_name: Option<String>,
-}
-
-#[post("/settings/display_name", data = "<new>")]
-pub async fn change_display_name(
-    session: Session,
-    mut db: Connection<Postgres>,
-    new: Json<DisplayNameForm>,
-) -> Result<(), Status> {
-    let mut user = User::get_by_id(session.user_id, &mut db)
-        .await
-        .ok_or(Status::NotFound)
-        .inspect_err(|_| {
-            tracing::error!(
-                "Valid session does not have a valid user. ID: {}",
-                session.user_id
-            )
-        })?;
-
-    user.set_display_name(new.display_name.clone(), &mut db)
-        .await
-        .inspect_err(|e| tracing::error!("{e}"))
-        .map_err(|_| Status::InternalServerError)?;
-
-    Ok(())
-}

backend/src/auth/two_factor.rs

@@ -1,286 +0,0 @@
-use rocket::{
-    Request,
-    http::Status,
-    outcome::{Outcome, try_outcome},
-    request::{self, FromRequest},
-    response::status::{self},
-    serde::json::Json,
-};
-use rocket_db_pools::Connection;
-use rocket_dyn_templates::{Template, context};
-use serde::{Deserialize, Serialize};
-use totp_rs::{Algorithm, Secret, TOTP};
-
-use crate::{
-    auth::{
-        account::AuthResponse,
-        session::{Claims, Session, TokenScope},
-    },
-    db::Postgres,
-};
-
-// Utility methods
-
-pub fn totp_gen(user_id: usize, secret: &[u8]) -> Result<TOTP, String> {
-    TOTP::new(
-        Algorithm::SHA1,
-        6,
-        1,
-        30,
-        secret.to_owned(),
-        Some("chat.zxq5.dev".to_string()),
-        format!("{}", user_id),
-    )
-    .map_err(|_| String::from("Invalid Secret"))
-}
-
-// pages
-
-#[get("/totp")]
-pub async fn mfa_page(_session: Session) -> Template {
-    Template::render("2fa", context!())
-}
-
-#[post("/totp", data = "<form>")]
-pub async fn confirm_totp(
-    mfa: TOTPSecret,
-    form: Json<TOTPSixDigitCode>,
-    mut db: Connection<Postgres>,
-) -> Result<(), status::Custom<&'static str>> {
-    if form.code.len() != 6 || form.code.parse::<u32>().is_err() {
-        return Err(status::Custom(Status::BadRequest, "Invalid 6-digit code"));
-    }
-
-    println!("valid");
-
-    let totp = totp_gen(mfa.user_id, mfa.secret.as_bytes())
-        .map_err(|_| status::Custom(Status::InternalServerError, "TOTP Error"))?;
-    if !totp.check_current(&form.code).unwrap_or(false) {
-        return Err(status::Custom(Status::BadRequest, "Incorrect code"));
-    }
-    println!("correct");
-
-    if sqlx::query!(
-        "UPDATE users SET twofa_enabled = true WHERE id = $1",
-        mfa.user_id as i32
-    )
-    .execute(&mut **db)
-    .await
-    .is_err()
-    {
-        return Err(status::Custom(
-            Status::InternalServerError,
-            "unable to enable 2fa",
-        ));
-    };
-
-    println!("enabled");
-
-    Ok(())
-}
-
-#[get("/totp.jpg")]
-pub async fn get_totp(mfa: TOTPSecret) -> Option<Json<QrResponse>> {
-    let qr_b64 = totp_gen(mfa.user_id, mfa.secret.as_bytes())
-        .expect("Invalid TOTP")
-        .get_qr_base64()
-        .unwrap();
-
-    Some(Json(QrResponse {
-        qr_code: format!("data:image/png;base64,{}", qr_b64),
-    }))
-}
-
-#[derive(Debug, Deserialize)]
-pub struct TOTPSixDigitCode {
-    code: String,
-}
-
-#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
-#[serde(rename_all = "snake_case")]
-pub enum TotpStatus {
-    Enabled,
-    Disabled,
-}
-
-pub struct TOTPSecret {
-    user_id: usize,
-    secret: String,
-}
-
-#[derive(Serialize)]
-pub struct QrResponse {
-    qr_code: String,
-}
-
-#[rocket::async_trait]
-impl<'r> FromRequest<'r> for TOTPSecret {
-    type Error = ();
-
-    async fn from_request(request: &'r Request<'_>) -> request::Outcome<Self, Self::Error> {
-        let auth_header = request.headers().get_one("Authorization");
-        println!(
-            "TOTPSecret guard - Auth header present: {}",
-            auth_header.is_some()
-        );
-
-        let user = try_outcome!(request.guard::<Claims>().await);
-        println!(
-            "TOTPSecret guard - Claims ok, user: {}, scope: {:?}",
-            user.sub, user.scope
-        );
-
-        // only allow full tokens for TOTP setup
-        if user.scope != TokenScope::Full {
-            println!("TOTPSecret guard - rejected, scope is {:?}", user.scope);
-            return Outcome::Error((Status::Forbidden, ()));
-        }
-
-        let user = try_outcome!(request.guard::<Session>().await);
-        let mut pool = match request.guard::<Connection<Postgres>>().await {
-            Outcome::Success(pool) => pool,
-            _ => return Outcome::Error((Status::Unauthorized, ())),
-        };
-
-        let row = sqlx::query!(
-            "SELECT twofa_enabled, totp_secret FROM users WHERE id = $1",
-            user.user_id as i32
-        )
-        .fetch_one(&mut **pool)
-        .await;
-
-        let (enabled, mut secret) = match row {
-            Ok(r) => (r.twofa_enabled, r.totp_secret),
-            Err(_) => return Outcome::Error((Status::Unauthorized, ())),
-        };
-
-        if secret.is_none() {
-            let new_secret = Secret::generate_secret().to_encoded().to_string();
-            sqlx::query!(
-                "UPDATE users SET totp_secret = $1 WHERE id = $2",
-                new_secret,
-                user.user_id as i32
-            )
-            .execute(&mut **pool)
-            .await
-            .ok();
-            secret = Some(new_secret);
-        }
-
-        Outcome::Success(TOTPSecret {
-            user_id: user.user_id,
-            secret: secret.unwrap(),
-        })
-    }
-}
-
-impl TOTPSecret {
-    pub async fn enable(&self, db: &mut Connection<Postgres>) -> Result<(), ()> {
-        match sqlx::query!(
-            "UPDATE users SET twofa_enabled = true WHERE id = $1",
-            self.user_id as i32,
-        )
-        .execute(&mut ***db)
-        .await
-        {
-            Ok(_) => Ok(()),
-            Err(_) => Err(()),
-        }
-    }
-}
-
-#[derive(Deserialize)]
-pub struct TotpVerifyRequest {
-    pub code: String,
-}
-
-#[get("/totp/status")]
-pub async fn get_totp_status(
-    user: Session,
-    mut db: Connection<Postgres>,
-) -> Result<Json<TotpStatus>, Status> {
-    Ok(Json(
-        if sqlx::query!(
-            "SELECT twofa_enabled FROM users WHERE id = $1",
-            user.user_id as i32,
-        )
-        .fetch_one(&mut **db)
-        .await
-        .map_err(|_| Status::NotFound)?
-        .twofa_enabled
-        {
-            TotpStatus::Enabled
-        } else {
-            TotpStatus::Disabled
-        },
-    ))
-}
-
-#[delete("/totp")]
-pub async fn disable_totp(
-    user: Session,
-    mut db: Connection<Postgres>,
-) -> Result<Json<AuthResponse>, Status> {
-    sqlx::query!(
-        "UPDATE users SET twofa_enabled = false, totp_secret = NULL WHERE id = $1",
-        user.user_id as i32,
-    )
-    .execute(&mut **db)
-    .await
-    .map_err(|_| Status::NotFound)?;
-
-    Ok(Json(AuthResponse {
-        token: Claims::new(user.user_id, TokenScope::Full).encode(),
-        totp_required: false,
-    }))
-}
-
-#[post("/totp/verify", data = "<body>")]
-pub async fn verify_totp(
-    user: Claims, // request guard checks token validity
-    mut db: Connection<Postgres>,
-    body: Json<TotpVerifyRequest>,
-) -> Result<Json<AuthResponse>, Status> {
-    println!("reached 1");
-
-    // reject if they somehow got here with a full token
-    if user.scope != TokenScope::TotpPending {
-        return Err(Status::Forbidden);
-    }
-
-    println!("reached 2");
-
-    let row = sqlx::query!(
-        "SELECT totp_secret FROM users WHERE id = $1 AND twofa_enabled = TRUE",
-        user.sub
-    )
-    .fetch_one(&mut **db)
-    .await
-    .map_err(|_| Status::Unauthorized)?;
-
-    println!("reached 3");
-
-    let totp = totp_gen(
-        user.sub as usize,
-        row.totp_secret
-            .expect("user with 2fa enabled has no totp secret")
-            .as_bytes(),
-    )
-    .map_err(|_| Status::InternalServerError)?;
-
-    if !totp
-        .check_current(&body.code)
-        .map_err(|_| Status::InternalServerError)?
-    {
-        return Err(Status::Unauthorized);
-    }
-
-    println!("reached 5");
-
-    let claims = Claims::new(user.sub as usize, TokenScope::Full);
-
-    Ok(Json(AuthResponse {
-        token: claims.encode(),
-        totp_required: false,
-    }))
-}

backend/src/cli.rs

@@ -0,0 +1,96 @@
+use clap::{Parser, Subcommand};
+use sqlx::postgres::PgPoolOptions;
+use std::time::Duration;
+use std::sync::Arc;
+use crate::repo::user_repo::UserRepository;
+use crate::repo::space_repo::SpaceRepository;
+use crate::repo::channel_repo::ChannelRepository;
+use crate::repo::{UserRepo, SpaceRepo, ChannelRepo};
+use argon2::{
+    password_hash::{PasswordHasher, SaltString},
+    Argon2,
+};
+use rand::rngs::OsRng;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+pub enum Commands {
+    /// First-time setup for the server
+    Setup {
+        /// Admin username
+        #[arg(short, long)]
+        username: String,
+
+        /// Admin password
+        #[arg(short, long)]
+        password: String,
+
+        /// Default space name
+        #[arg(short, long, default_value = "Default Space")]
+        space: String,
+
+        /// Default channel name
+        #[arg(short, long, default_value = "general")]
+        channel: String,
+    },
+}
+
+pub async fn handle_cli() -> bool {
+    let cli = Cli::parse();
+
+    match cli.command {
+        Some(Commands::Setup { username, password, space, channel }) => {
+            if let Err(e) = run_setup(username, password, space, channel).await {
+                eprintln!("Setup failed: {}", e);
+                std::process::exit(1);
+            }
+            println!("Setup completed successfully!");
+            true
+        }
+        None => false,
+    }
+}
+
+async fn run_setup(username: String, password: String, space_name: String, channel_name: String) -> Result<(), Box<dyn std::error::Error>> {
+    dotenv::dotenv().ok();
+    let db_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+    let pool = PgPoolOptions::new()
+        .max_connections(1)
+        .acquire_timeout(Duration::from_secs(5))
+        .connect(&db_url)
+        .await?;
+
+    let user_repo = UserRepository::new(pool.clone());
+    let space_repo = SpaceRepository::new(pool.clone());
+    let channel_repo = ChannelRepository::new(pool.clone());
+
+    // 1. Create admin user
+    println!("Creating admin user: {}...", username);
+    
+    let argon2 = Argon2::default();
+    let salt = SaltString::generate(&mut OsRng);
+    let passhash = argon2
+        .hash_password(password.as_bytes(), &salt)
+        .map_err(|e| e.to_string())?
+        .to_string();
+
+    let user_id = user_repo.new_user("admin@localhost", &username, &passhash).await?;
+    user_repo.set_role(user_id, "admin").await?;
+
+    // 2. Create default space
+    println!("Creating default space: {}...", space_name);
+    let space_id = space_repo.create(&space_name, Some("Default space created during setup"), user_id).await?;
+
+    // 3. Create default channel
+    println!("Creating default channel: {}...", channel_name);
+    channel_repo.create(&channel_name, Some("Default channel"), space_id).await?;
+
+    Ok(())
+}

backend/src/db.rs

@@ -1,9 +0,0 @@
-use rocket_db_pools::{Database, deadpool_redis};
-
-#[derive(Database)]
-#[database("postgres_db")]
-pub struct Postgres(sqlx::PgPool);
-
-#[derive(Database)]
-#[database("redis_cache")]
-pub struct Redis(deadpool_redis::Pool);

backend/src/error.rs

@@ -0,0 +1,127 @@
+// error.rs
+use rocket::{http::Status, response::{self, Responder}, Request, Response};
+use thiserror::Error;
+use rocket_dyn_templates::Template;
+use rocket::serde::Serialize;
+
+#[derive(Error, Debug)]
+pub enum AppError {
+	#[error("Not found")]
+	NotFound,
+
+	#[error("Unauthorized")]
+	Unauthorised(String),
+
+	#[error("Forbidden")]
+	Forbidden,
+
+	#[error("Bad request: {0}")]
+	BadRequest(String),
+
+	#[error("Database error: {0}")]
+	Database(#[from] sqlx::Error),
+
+	#[error("Internal error: {0}")]
+	Internal(String),
+}
+
+impl AppError {
+	pub fn internal(msg: impl Into<String>) -> Self {
+		Self::Internal(msg.into())
+	}
+
+	pub fn bad_request(msg: impl Into<String>) -> Self {
+		Self::BadRequest(msg.into())
+	}
+	pub fn unauthorised(msg: impl Into<String>) -> Self {
+		Self::Unauthorised(msg.into())
+	}
+}
+
+impl<'r> Responder<'r, 'static> for AppError {
+	fn respond_to(self, _req: &'r Request<'_>) -> response::Result<'static> {
+		let status = match &self {
+			AppError::NotFound => Status::NotFound,
+			AppError::Unauthorised(_) => Status::Unauthorized,
+			AppError::Forbidden => Status::Forbidden,
+			AppError::BadRequest(_) => Status::BadRequest,
+			AppError::Database(_) => Status::InternalServerError,
+			AppError::Internal(_) => Status::InternalServerError,
+		};
+
+		// log internal errors
+		if status == Status::InternalServerError {
+			tracing::error!("Internal Server Error: {}", self);
+		}
+
+		Response::build()
+			.status(status)
+			.header(rocket::http::ContentType::Plain)
+			.sized_body(
+				self.to_string().len(),
+				std::io::Cursor::new(self.to_string())
+			)
+			.ok()
+	}
+}
+
+pub type ApiResult<T> = Result<T, AppError>;
+
+#[derive(Serialize)]
+struct ErrorContext {
+    error_code: u16,
+    error_message: &'static str,
+    additional_info: &'static str,
+    redirect: Option<RedirectContext>,
+}
+
+#[derive(Serialize)]
+struct RedirectContext {
+    url: &'static str,
+    message: &'static str,
+}
+
+#[catch(404)]
+pub async fn handle_404() -> Template {
+    Template::render(
+        "error",
+        ErrorContext {
+            error_code: 404,
+            error_message: "Not Found",
+            additional_info: "There's nothing here.",
+            redirect: Some(RedirectContext {
+                url: "/",
+                message: "Home",
+            }),
+        },
+    )
+}
+
+#[catch(401)]
+pub async fn handle_401() -> Template {
+    Template::render(
+        "error",
+        ErrorContext {
+            error_code: 401,
+            error_message: "Unauthorised",
+            additional_info: "You are not authorised to access this resource.",
+            redirect: Some(RedirectContext {
+                url: "/login",
+                message: "Login",
+            }),
+        },
+    )
+}
+
+#[catch(default)]
+pub async fn handle_default(status: Status, _request: &Request<'_>) -> Template {
+    Template::render(
+        "error",
+        ErrorContext {
+            error_code: status.code,
+            error_message: "Unknown Error",
+            additional_info: "I don't know what to do with this error.",
+            redirect: None,
+        },
+    )
+}

backend/src/handlers.rs

@@ -1,62 +0,0 @@
-use rocket::{Request, http::Status};
-use rocket_dyn_templates::Template;
-use serde::Serialize;
-
-#[derive(Serialize)]
-struct ErrorContext {
-    error_code: u16,
-    error_message: &'static str,
-    additional_info: &'static str,
-    redirect: Option<RedirectContext>,
-}
-
-#[derive(Serialize)]
-struct RedirectContext {
-    url: &'static str,
-    message: &'static str,
-}
-
-#[catch(404)]
-pub async fn handle_404() -> Template {
-    Template::render(
-        "error",
-        ErrorContext {
-            error_code: 404,
-            error_message: "Not Found",
-            additional_info: "There's nothing here.",
-            redirect: Some(RedirectContext {
-                url: "/",
-                message: "Home",
-            }),
-        },
-    )
-}
-
-#[catch(401)]
-pub async fn handle_401() -> Template {
-    Template::render(
-        "error",
-        ErrorContext {
-            error_code: 401,
-            error_message: "Unauthorised",
-            additional_info: "You are not authorised to access this resource.",
-            redirect: Some(RedirectContext {
-                url: "/login",
-                message: "Login",
-            }),
-        },
-    )
-}
-
-#[catch(default)]
-pub async fn handle_default(status: Status, _request: &Request<'_>) -> Template {
-    Template::render(
-        "error",
-        ErrorContext {
-            error_code: status.code,
-            error_message: "Unknown Error",
-            additional_info: "I don't know what to do with this error.",
-            redirect: None,
-        },
-    )
-}

backend/src/lib.rs

@@ -0,0 +1,149 @@
+#![deny(clippy::unwrap_used)]
+#![warn(clippy::all, clippy::nursery, clippy::cargo, clippy::pedantic)]
+
+#[macro_use]
+extern crate rocket;
+
+pub mod messenger;
+pub mod api;
+pub mod repo;
+pub mod error;
+pub mod svc;
+pub mod model;
+pub mod cli;
+
+use crate::repo::{access_token_repo::AccessTokenRepo, Repo};
+use crate::repo::message_repo::MessageRepository;
+use crate::repo::user_repo::UserRepository;
+use crate::repo::space_repo::SpaceRepository;
+use crate::repo::channel_repo::ChannelRepository;
+use crate::svc::auth_svc::AuthService;
+use crate::svc::chat_svc::ChatService;
+use crate::svc::settings_svc::SettingsService;
+use crate::svc::user_svc::UserService;
+use rocket::fs::{FileServer, NamedFile};
+use rocket::http::Method;
+use rocket_cors::{AllowedOrigins, CorsOptions};
+use rocket_dyn_templates::Template;
+use sqlx::postgres::PgPoolOptions;
+use std::env;
+use std::sync::{Arc, LazyLock};
+use std::time::Duration;
+use api::cdn;
+use crate::svc::access_token_svc::AccessTokenService;
+use crate::svc::llm_service::LlmService;
+
+pub fn rocket() -> rocket::Rocket<rocket::Build> {
+    if std::env::var("RELEASE_MODE").unwrap_or_default() != "1" {
+        dotenv::dotenv().ok();
+    }
+    let db_url = std::env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+
+    let pool = PgPoolOptions::new()
+        .max_connections(25)
+        .min_connections(5)
+        .acquire_timeout(Duration::from_secs(5))
+        .connect_lazy(&db_url)
+        .expect("Failed to create database pool");
+
+    let user_repo = Arc::new(UserRepository::new(pool.clone()));
+    let message_repo = MessageRepository::new(pool.clone());
+    let token_repo = Arc::new(AccessTokenRepo::new(pool.clone()));
+    let space_repo: Arc<dyn repo::SpaceRepo> = Arc::new(SpaceRepository::new(pool.clone()));
+    let channel_repo: Arc<dyn repo::ChannelRepo> = Arc::new(ChannelRepository::new(pool.clone()));
+    let llm_service = LlmService::new();
+    let chat_service = ChatService::new(32, llm_service.clone(), message_repo.clone(), user_repo.clone(), channel_repo.clone(), space_repo.clone());
+
+    rocket_builder(user_repo, token_repo, space_repo, channel_repo, chat_service)
+}
+
+pub fn rocket_builder(
+    user_repo: Arc<dyn repo::UserRepo>,
+    token_repo: Arc<dyn repo::AccessTokenRepoTrait>,
+    space_repo: Arc<dyn repo::SpaceRepo>,
+    channel_repo: Arc<dyn repo::ChannelRepo>,
+    chat_service: ChatService
+) -> rocket::Rocket<rocket::Build> {
+
+    
+    let cors = CorsOptions::default()
+        .allowed_origins(AllowedOrigins::all())
+        .allowed_methods(
+            vec![Method::Get, Method::Post, Method::Patch]
+                .into_iter()
+                .map(From::from)
+                .collect(),
+        )
+        .allow_credentials(true);
+
+    let access_token_svc = AccessTokenService::new(token_repo.clone());
+    let auth_service = AuthService::new(user_repo.clone(), access_token_svc.clone());
+    let settings_service = SettingsService::new(auth_service.clone(), user_repo.clone());
+    let user_service = UserService::new(user_repo.clone());
+
+    rocket::build()
+        .manage(chat_service)
+        .manage(auth_service)
+        .manage(settings_service)
+        .manage(user_service)
+        .manage(space_repo)
+        .manage(channel_repo)
+        .attach(cors.to_cors().unwrap())
+        .attach(Template::fairing())
+        .mount("/static", FileServer::from("static"))
+        .mount("/cdn", cdn::routes())
+        .mount(
+            "/",
+            routes![
+                favicon,
+
+            ],
+        )
+        .mount(
+            "/api",
+            routes![
+                cdn::upload_profile_pic,
+                api::profile::display_name,
+
+                // basic auth
+                api::auth::login,
+                api::auth::signup,
+
+                // 2fa
+                api::totp::confirm_totp,
+                api::totp::disable_totp,
+                api::totp::get_totp,
+                api::totp::get_totp_status,
+                api::totp::verify_totp,
+
+                // chat
+                api::chat::event_stream,
+                api::chat::post_message,
+
+                // user settings
+                api::settings::change_display_name,
+                api::settings::change_password,
+                api::settings::change_username,
+                api::settings::delete_account,
+
+                // spaces
+                api::space::list_spaces,
+                api::space::list_channels,
+                api::space::get_accessible_channels
+            ],
+        )
+        .register(
+            "/",
+            catchers![
+                error::handle_401,
+                error::handle_404,
+                error::handle_default,
+            ],
+        )
+}
+
+#[get("/favicon.ico")]
+pub async fn favicon() -> NamedFile {
+    NamedFile::open("static/favicon.ico").await.unwrap()
+}