#include <stdbool.h>
#include <stdlib.h>
#include "dynstr.h"
#include <ncurses.h>

typedef struct {
    uint32_t lines;
    uint32_t screen_line;
    uint32_t screen_col;
    bool editmode;
    String_t* buffer;
} Editor;

Editor editor_from(String_t input_string) {
    Editor e;
    e.lines = 0;
    e.screen_line = 0;
    e.screen_col = 0;
    e.editmode = false;

    int linenum = 0;
    e.buffer = str_lines(&input_string, &linenum);
    e.lines = (size_t)linenum;
    str_dealloc(&input_string);
 
    for (size_t i = 0; i < e.lines; i++) {
        // adding the line number
        char line_no[5];
        snprintf(line_no, 5, "%-5d", i + 1);
        // adding the line of text to the buffer
        addstr(line_no);
        addch(' ');
        addstr(to_chars(&e.buffer[i]));
        addstr("\n");   
    }    
    return e;
}

Editor new_editor() {
    return editor_from(str_new());
}

void move_cursor(Editor* self, int x, int y) {
    if (y != 0
        && (int)(self->screen_line) + y >= 0
        && self->screen_line + y <= self->lines) 
    {
        self->screen_line += y;
        int line_width = str_len(&self->buffer[self->screen_line]);
        if (self->screen_col > line_width) {
            self->screen_col = line_width;
        }
    } else if ((int)(self->screen_col) + x < 0) {
        if ((int)self->screen_line - 1 >= 0) {
            self->screen_line -= 1;
            self->screen_col = str_len(&self->buffer[self->screen_line]);
        }
    } else if (self->screen_col + x > str_len(&self->buffer[self->screen_line])) {
        if (self->screen_line + 1 <= self->lines) {
            self->screen_col = 0;
            self->screen_line += 1;
        }
    } else if (x != 0) {
        self->screen_col += x;
    }    
    move(self->screen_line, self->screen_col + 5);
}

void delchar(Editor* self) {
    str_remove(&self->buffer[self->screen_line], self->screen_col);
    delch();
}

void pressed_enter(Editor* self) {
    move_cursor(self, 1, 0);
}

void addchar(Editor* self, char c) {
    if (self->screen_line == self->lines) {
        move(self->screen_line, 0);
        char line_no[5];
        snprintf(line_no, 5, "%-5d", self->screen_line + 1);
        // adding the line of text to the buffer
        addstr(line_no);
        addch(' ');
        move(self->screen_line, self->screen_col + 5);
            
        fprintf(stderr, "buffer full\n");
        // reallocate self->buffer to be 1 larger
        self->lines++;
        self->buffer = realloc(self->buffer, sizeof(String_t) * (self->lines + 1));

        // allocate the memory space for the new line and add it to the buffer
        self->buffer[self->screen_line] = str_new();
        for (size_t i = 0; i < self->lines; i++) {
            fprintf(stderr, "size: %d\n", (&self->buffer[i])->size);
        }

        fprintf(stderr, "ok!");
    }

    insch(c);
    // insert the character into the string at the given index
    str_insert(&self->buffer[self->screen_line], self->screen_col, c);
    move_cursor(self, 1, 0);
}

String_t* to_string(Editor* self) {

}