import 'package:media_kit/media_kit.dart';

class PlaybackService {
  static final PlaybackService _instance = PlaybackService._();
  factory PlaybackService() => _instance;
  PlaybackService._();

  late final Player _player;
  bool _initialized = false;

  void init() {
    if (_initialized) return;
    _player = Player();
    _initialized = true;
  }

  Future<void> play(String url) async {
    if (!_initialized) init();
    await _player.open(Media(url));
    await _player.play();
  }

  void pause() {
    if (_initialized) {
      _player.pause();
    }
  }

  void resume() {
    if (_initialized) {
      _player.play();
    }
  }

  void stop() {
    if (_initialized) {
      _player.stop();
    }
  }

  void dispose() {
    if (_initialized) {
      _player.dispose();
      _initialized = false;
    }
  }

  // ✅ 直接返回 PlayerStream（它就是播放器的状态流）
  PlayerStream get stateStream {
    if (!_initialized) init();
    return _player.stream;
  }

  // 获取当前播放状态
  PlayerState get currentState {
    if (!_initialized) {
      return PlayerState(
        playing: false,
        position: Duration.zero,
        duration: Duration.zero,
        buffering: false,
      );
    }
    return _player.state;
  }
}