import 'package:flutter/services.dart';

class MusicService {
  static final MusicService _instance = MusicService._internal();

  /// 获取单例
  factory MusicService() => _instance;

  // 方法通道
  final MethodChannel _methodChannel = const MethodChannel(
    'com.yunqiinnovation.music_service',
  );

  // 事件通道 - 简化为只使用数据和状态通道
  late final EventChannel _dataEventChannel;
  late final EventChannel _statusEventChannel;

  // 事件流
  late final Stream<dynamic> _dataStream;
  late final Stream<dynamic> _statusStream;

  // 获取事件流
  Stream<dynamic> get onDataReceived => _dataStream;

  // 状态流直接传递原始数据
  Stream<dynamic> get onStatusUpdated => _statusStream;

  // 内部构造函数
  MusicService._internal() {
    _dataEventChannel = const EventChannel(
      'com.yunqiinnovation.music_service/data_events',
    );
    _statusEventChannel = const EventChannel(
      'com.yunqiinnovation.music_service/status_events',
    );

    // 初始化事件流
    _dataStream = _dataEventChannel.receiveBroadcastStream();
    _statusStream = _statusEventChannel.receiveBroadcastStream();
  }

  Future<void> playMusic(Map<String, dynamic> song) async {
    await _methodChannel.invokeMethod('play', {'song': song});
  }

  Future<void> pauseMusic() async => _methodChannel.invokeMethod('pause');
  Future<void> resumeMusic() async => _methodChannel.invokeMethod('resume');
  Future<void> nextTrack() async => _methodChannel.invokeMethod('next');
  Future<void> previousTrack() async => _methodChannel.invokeMethod('previous');
  Future<void> stopMusic() async => _methodChannel.invokeMethod('stop');
  Future<void> setVolume(double volume) async => _methodChannel.invokeMethod(
    'setVolume',
    {'volume': volume},
  ); // volume: 0.0~1.0
  Future<Map<String, dynamic>> getStatus() async {
    final result = await _methodChannel.invokeMethod<Map>('getStatus');
    return {
      'isPlaying': result?['isPlaying'] ?? false,
      'url': result?['url'] ?? "",
    };
  }

  /// 获取播放进度信息
  Future<Map<String, dynamic>> getProgress() async {
    final result = await _methodChannel.invokeMethod<Map>('getProgress');
    return {
      'currentPosition': result?['currentPosition'] ?? 0, // 当前播放位置（毫秒）
      'duration': result?['duration'] ?? 0, // 总时长（毫秒）
      'progress': result?['progress'] ?? 0.0, // 播放进度（0.0-1.0）
    };
  }

  /// 跳转到指定位置
  Future<void> seekTo(int positionMs) async {
    await _methodChannel.invokeMethod('seekTo', {'position': positionMs});
  }
}