//! MoMentry Playground - Main entry point
//!
//! Unified media player with ASR/YOLO/Chunks overlay support

use anyhow::Result;
use log::{error, info};
use sdl2::pixels::PixelFormatEnum;
use std::path::Path;

mod config;
mod overlay;
mod player;
mod web;

use config::Config;
use overlay::{AsrLoader, YoloLoader};
use player::ffmpeg::FFmpegDecoder;
use player::state::{PlaybackState, PlayerState};

fn main() -> Result<()> {
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    let config = Config::load()?;
    info!("MoMentry Playground starting...");
    info!("Window: {}x{}", config.width, config.height);

    if let Err(e) = run(&config) {
        error!("Application error: {}", e);
        std::process::exit(1);
    }

    Ok(())
}

fn run(config: &Config) -> Result<()> {
    let sdl_context = sdl2::init().map_err(|e| anyhow::anyhow!("SDL init failed: {}", e))?;
    let video_subsystem = sdl_context
        .video()
        .map_err(|e| anyhow::anyhow!("Video subsystem failed: {}", e))?;

    let window = video_subsystem
        .window("MoMentry Playground", config.width, config.height)
        .position_centered()
        .build()
        .map_err(|e| anyhow::anyhow!("Window creation failed: {}", e))?;

    let mut canvas = window
        .into_canvas()
        .build()
        .map_err(|e| anyhow::anyhow!("Canvas creation failed: {}", e))?;

    let texture_creator = canvas.texture_creator();

    let mut decoder: Option<FFmpegDecoder> = None;
    let mut texture: Option<sdl2::render::Texture> = None;
    let mut asr: Option<AsrLoader> = None;
    let mut yolo: Option<YoloLoader> = None;

    if let Some(ref video_path) = config.video {
        info!("Loading video: {:?}", video_path);
        let path = Path::new(video_path);
        let mut dec = FFmpegDecoder::new(path)?;
        let info = dec.get_info();
        info!(
            "Video info: {}x{} @ {:.2}fps, {} frames",
            info.width, info.height, info.fps, info.frame_count
        );

        let tex = texture_creator
            .create_texture_streaming(PixelFormatEnum::RGB24, info.width, info.height)
            .map_err(|e| anyhow::anyhow!("Texture creation failed: {}", e))?;

        texture = Some(tex);
        dec.start_decoding(0)?;
        decoder = Some(dec);
    }

    if let Some(ref asr_path) = config.asr {
        info!("Loading ASR: {:?}", asr_path);
        match AsrLoader::load(asr_path) {
            Ok(loader) => {
                info!("ASR loaded: {} segments", loader.segment_count());
                asr = Some(loader);
            }
            Err(e) => {
                error!("Failed to load ASR: {}", e);
            }
        }
    }

    if let Some(ref yolo_path) = config.yolo {
        info!("Loading YOLO: {:?}", yolo_path);
        match YoloLoader::load(yolo_path) {
            Ok(loader) => {
                info!("YOLO loaded: {} frames", loader.total_frames());
                yolo = Some(loader);
            }
            Err(e) => {
                error!("Failed to load YOLO: {}", e);
            }
        }
    }

    let mut player_state = PlayerState::default();
    if let Some(ref dec) = decoder {
        let info = dec.get_info();
        player_state.total_frames = info.frame_count;
        player_state.duration_ms = info.duration_ms;
        player_state.fps = info.fps;
    }

    let mut event_pump = sdl_context
        .event_pump()
        .map_err(|e| anyhow::anyhow!("Event pump failed: {}", e))?;

    info!("Main loop started - waiting for events...");

    let mut running = true;
    while running {
        for event in event_pump.poll_iter() {
            match event {
                sdl2::event::Event::Quit { .. } => {
                    running = false;
                }
                sdl2::event::Event::KeyDown { keycode, .. } => {
                    if let Some(key) = keycode {
                        match key {
                            sdl2::keyboard::Keycode::Escape => running = false,
                            sdl2::keyboard::Keycode::Space => {
                                player_state.playback =
                                    if player_state.playback == PlaybackState::Playing {
                                        PlaybackState::Paused
                                    } else {
                                        PlaybackState::Playing
                                    };
                            }
                            sdl2::keyboard::Keycode::S => {
                                player_state.show_subtitle = !player_state.show_subtitle;
                            }
                            sdl2::keyboard::Keycode::Y => {
                                player_state.show_yolo = !player_state.show_yolo;
                            }
                            sdl2::keyboard::Keycode::C => {
                                player_state.show_chunks = !player_state.show_chunks;
                            }
                            sdl2::keyboard::Keycode::M => {
                                player_state.muted = !player_state.muted;
                            }
                            sdl2::keyboard::Keycode::Left => {
                                if let Some(ref mut dec) = decoder {
                                    let current = player_state.current_frame.saturating_sub(1);
                                    dec.seek(
                                        ((current as f64 / player_state.fps) * 1000.0) as u64,
                                    )?;
                                    player_state.current_frame = current;
                                }
                            }
                            sdl2::keyboard::Keycode::Right => {
                                if let Some(ref mut dec) = decoder {
                                    let current = player_state.current_frame + 1;
                                    dec.seek(
                                        ((current as f64 / player_state.fps) * 1000.0) as u64,
                                    )?;
                                    player_state.current_frame = current;
                                }
                            }
                            _ => {}
                        }
                    }
                }
                _ => {}
            }
        }

        canvas.set_draw_color(sdl2::pixels::Color::BLACK);
        canvas.clear();

        if player_state.playback == PlaybackState::Playing {
            if let Some(ref mut dec) = decoder {
                if let Some(ref mut tex) = texture {
                    match dec.read_frame() {
                        Ok(Some(data)) => {
                            let info = dec.get_info();
                            player_state.current_frame += 1;
                            player_state.current_time_ms =
                                ((player_state.current_frame as f64 / info.fps) * 1000.0) as u64;

                            tex.update(None, &data, (info.width * 3) as usize)
                                .map_err(|e| anyhow::anyhow!("Texture update failed: {}", e))?;

                            canvas
                                .copy(tex, None, None)
                                .map_err(|e| anyhow::anyhow!("Copy failed: {}", e))?;

                            if player_state.show_yolo {
                                if let Some(ref mut yolo_loader) = yolo {
                                    let detections =
                                        yolo_loader.get_detections(player_state.current_frame);
                                    for det in detections {
                                        let x1 = det.x1 as i32;
                                        let y1 = det.y1 as i32;
                                        let w = (det.x2 - det.x1) as u32;
                                        let h = (det.y2 - det.y1) as u32;

                                        canvas.set_draw_color(sdl2::pixels::Color::RGB(0, 255, 0));
                                        let _ =
                                            canvas.draw_rect(sdl2::rect::Rect::new(x1, y1, w, h));
                                    }
                                }
                            }
                        }
                        Ok(None) => {
                            info!("Playback ended");
                            break;
                        }
                        Err(e) => {
                            error!("Frame read error: {}", e);
                            break;
                        }
                    }
                }
            }
        }

        canvas.present();

        std::thread::sleep(std::time::Duration::from_millis(16));
    }

    info!("Application closed");
    Ok(())
}