// lib/services/audio_player_handler.dart
import 'package:flutter/foundation.dart';
import 'package:audio_service/audio_service.dart' as audio_service;
import '../audio/player_controller.dart';
import '../audio/playback_state_manager.dart';
import '../services/audio_service.dart'; // 你的业务 AudioService

class AudioPlayerHandler extends audio_service.BaseAudioHandler {
  final PlayerController _player = PlayerController();
  final PlaybackStateManager _state = PlaybackStateManager();

  AudioPlayerHandler() {
    _player.playingStream.listen((playing) {
      _state.updatePlaying(playing);
      _publishState();
    });

    _player.positionStream.listen((position) {
      _state.updatePosition(position);
      final current = playbackState.value;
      playbackState.add(audio_service.PlaybackState(
        controls: current.controls,
        processingState: current.processingState,
        playing: current.playing,
        androidCompactActionIndices: current.androidCompactActionIndices,
        updateTime: DateTime.now(),
      ));
    });

    _player.durationStream.listen((duration) {
      _state.updateDuration(duration);
      _publishState();
    });

    _player.completedStream.listen((_) {
      debugPrint('⏭️ [handler] completed, auto next');
      AudioService().next();
    });
  }

  void _publishState() {
    final state = _state.playbackState;

    debugPrint(
      '📡 [publish] '
      'playing=${state.playing}, '
      'controls=${state.controls.map((e) => e.action).toList()}',
    );

    playbackState.add(state);
  }

  void updateNotification({
    required String id,
    required String title,
    required String artist,
  }) {
    debugPrint('📢 [handler] updateNotification: $title');
    mediaItem.add(audio_service.MediaItem(
      id: id,
      title: title,
      artist: artist,
      duration: _player.duration,
    ));
  }

  // ---- 控制命令（系统回调） ----
  @override
  Future<void> play() async {
    debugPrint('▶️ [handler] play() called');
    await _player.play();
  }

  @override
  Future<void> pause() async {
    debugPrint('⏸️ [handler] pause() called');
    await _player.pause();
  }

  @override
  Future<void> stop() async {
    debugPrint('⏹️ [handler] stop() called');
    _player.stop();
  }

  @override
  Future<void> seek(Duration position) async {
    debugPrint('⏩ [handler] seek() called: $position');
    _player.seek(position);
  }

  @override
  Future<void> skipToNext() async {
    debugPrint('⏭️ [handler] skipToNext() called');
    AudioService().next();
  }

  @override
  Future<void> skipToPrevious() async {
    debugPrint('⏮️ [handler] skipToPrevious() called');
    AudioService().previous();
  }

  // ⭐ 统一点击处理（仅使用 MediaButton 存在的枚举）
  @override
  Future<void> click(
      [audio_service.MediaButton button =
          audio_service.MediaButton.media]) async {
    debugPrint('🎯 [handler] click() called with button: ${button.name}');
    switch (button) {
      case audio_service.MediaButton.next:
        await skipToNext();
        break;
      case audio_service.MediaButton.previous:
        await skipToPrevious();
        break;
      case audio_service.MediaButton.media:
        // 播放/暂停切换
        if (_player.isPlaying) {
          await pause();
        } else {
          await play();
        }
        break;
      default:
        // 其他按钮（fastForward, rewind等）忽略或fallback
        debugPrint('⚠️ [handler] unhandled MediaButton: $button');
        break;
    }
  }
}