slightly broken but very refactored. TODO: make the code that should run on the clientside run on the clientside

src/main/kotlin/dev/zxq5/Fantasysmp.kt

@@ -1,30 +1,29 @@
 package dev.zxq5
 
+import dev.zxq5.items.ItemImplementation
+import dev.zxq5.items.ItemTagAdder
 import dev.zxq5.items.ModItems
 import dev.zxq5.items.Witherite
-import dev.zxq5.items.isWearingFullSet
 import net.fabricmc.api.ModInitializer
+import net.fabricmc.fabric.api.datagen.v1.FabricPackOutput
+import net.fabricmc.fabric.api.datagen.v1.provider.FabricRecipeProvider
+import net.fabricmc.fabric.api.datagen.v1.provider.FabricTagsProvider
 import net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
-import net.fabricmc.fabric.api.event.player.AttackEntityCallback
-import net.minecraft.world.InteractionHand
-import net.minecraft.world.InteractionResult
-import net.minecraft.world.effect.MobEffectInstance
+import net.minecraft.core.HolderLookup
+import net.minecraft.data.recipes.RecipeOutput
+import net.minecraft.data.recipes.RecipeProvider
 import net.minecraft.world.effect.MobEffects
-import net.minecraft.world.entity.LivingEntity
 import org.slf4j.LoggerFactory
+import java.util.concurrent.CompletableFuture
 
 object Fantasysmp : ModInitializer {
-
 	const val MOD_ID = "fantasysmp"
 
     private val logger = LoggerFactory.getLogger("fantasysmp")
 
 	override fun onInitialize() {
-		// This code runs as soon as Minecraft is in a mod-load-ready state.
-		// However, some things (like resources) may still be uninitialized.
-		// Proceed with mild caution.
 		logger.info("Hello Fabric world!")
-		ModItems.init();
+		ModItems.onLoad();
 		// Register the group.
 		registerItemEffects()
 	}
@@ -32,32 +31,36 @@ object Fantasysmp : ModInitializer {
 	private fun registerItemEffects() {
 		ServerTickEvents.END_SERVER_TICK.register { server ->
 			for (player in server.playerList.players) {
-				if (player.isWearingFullSet(Witherite.ARMOUR_SET)) {
+				if (Witherite.fullSetEquippedBy(player)) {
 					player.removeEffect(MobEffects.WITHER)
 				}
 			}
 		}
+	}
+}
 
-		AttackEntityCallback.EVENT.register { player, world, hand, entity, _ ->
-			if (world.isClientSide) return@register InteractionResult.PASS
-			if (hand != InteractionHand.MAIN_HAND) return@register InteractionResult.PASS
-			if (player.getItemInHand(hand).item != Witherite.SWORD) return@register InteractionResult.PASS
-			if (entity is LivingEntity) {
-				entity.addEffect(MobEffectInstance(MobEffects.WITHER, 60, 1), player)
+class ModRecipeProvider(
+	output: FabricPackOutput,
+	registriesFuture: CompletableFuture<HolderLookup.Provider>
+) : FabricRecipeProvider(output, registriesFuture) {
+	override fun createRecipeProvider(
+		registries: HolderLookup.Provider,
+		exporter: RecipeOutput
+	): RecipeProvider {
+		return object : RecipeProvider(registries, exporter) {
+			override fun buildRecipes() {
+				ItemImplementation.all.forEach { it.generateRecipes(registries, exporter) }
 			}
-
-			InteractionResult.PASS
-		}
-
-		AttackEntityCallback.EVENT.register { player, world, hand, entity, _ ->
-			if (world.isClientSide) return@register InteractionResult.PASS
-			if (hand != InteractionHand.MAIN_HAND) return@register InteractionResult.PASS
-			if (player.getItemInHand(hand).item != Witherite.AXE) return@register InteractionResult.PASS
-			if (entity is LivingEntity) {
-				entity.addEffect(MobEffectInstance(MobEffects.WITHER, 60, 1), player)
-			}
-
-			InteractionResult.PASS
 		}
 	}
+
+	override fun getName(): String = "Fantasysmp Recipes"
+}
+
+class ModItemTagProvider(output: FabricPackOutput, registriesFuture: CompletableFuture<HolderLookup.Provider>) :
+	FabricTagsProvider.ItemTagsProvider(output, registriesFuture) {
+	override fun addTags(provider: HolderLookup.Provider) {
+		val adder = ItemTagAdder(this)
+		ItemImplementation.all.forEach { it.generateItemTags(adder) }
+	}
 }