use core::periph::backplane::Backplane;
use core::computers::rom_only::backplane::RomOnlyComputer;
use egui_macroquad::egui::TextBuffer;
use macroquad::prelude::*;

struct UIState {
    address: u16,
    data: u8,
    new_address_input: String,
    new_data_input: String,
}

#[macroquad::main("Tick Interface")]
async fn main() {
    let mut ui = UIState {
        address: 0x1234,
        data: 0xAB,
        new_address_input: String::new(),
        new_data_input: String::new(),
    };

    let rom_program = vec![0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07];

    let mut rom_only_pc = RomOnlyComputer::program(rom_program);

    loop {
        clear_background(BLACK);

        // Labels
        draw_text("Address:", 20.0, 40.0, 30.0, WHITE);
        draw_text(&format!("0x{:04X}", ui.address), 150.0, 40.0, 30.0, YELLOW);

        draw_text("Data:", 20.0, 80.0, 30.0, WHITE);
        draw_text(&format!("0x{:02X}", ui.data), 150.0, 80.0, 30.0, YELLOW);

        // Input: New Address
        draw_text("New Address:", 20.0, 140.0, 25.0, WHITE);
        ui.new_address_input = draw_textbox(&ui.new_address_input, 200.0, 120.0, 150.0);

        // Input: New Data
        draw_text("New Data:", 20.0, 190.0, 25.0, WHITE);
        ui.new_data_input = draw_textbox(&ui.new_data_input, 200.0, 170.0, 150.0);

        // Tick Button
        if is_mouse_button_pressed(MouseButton::Left) {
            let (mx, my) = mouse_position();
            if mx >= 20.0 && mx <= 120.0 && my >= 220.0 && my <= 260.0 {
                if let Ok(addr) = u16::from_str_radix(&ui.new_address_input.trim_start_matches("0x"), 16) {
                    rom_only_pc.set_address_bus(addr);
                }
                if let Ok(dat) = u8::from_str_radix(&ui.new_data_input.trim_start_matches("0x"), 16) {
                    rom_only_pc.set_data_bus(dat);
                }
                println!("Tick: addr=0x{:04X} data=0x{:02X}", ui.address, ui.data);
                rom_only_pc.tick();
            }
        }

        // Draw button
        draw_rectangle(20.0, 220.0, 100.0, 40.0, DARKGRAY);
        draw_text("Tick", 40.0, 250.0, 30.0, WHITE);

        ui.address = rom_only_pc.address_bus();
        ui.data = rom_only_pc.data_bus();

        next_frame().await;
    }
}

fn draw_textbox(input: &str, x: f32, y: f32, width: f32) -> String {
    let mut new_input = input.to_string();

    draw_rectangle_lines(x - 5.0, y - 5.0, width + 10.0, 40.0, 2.0, WHITE);
    draw_text(input, x, y + 25.0, 30.0, WHITE);

    if is_mouse_button_pressed(MouseButton::Left) {
        let (mx, my) = mouse_position();
        if mx >= x && mx <= x + width && my >= y && my <= y + 40.0 {
            new_input = String::new(); // reset input on click
        }
    }

    for c in get_char_pressed() {
        if c == '\u{8}' {
            new_input.pop(); // backspace
        } else if c.is_ascii_hexdigit() {
            new_input.push(c.to_ascii_uppercase());
        }
    }

    new_input
}