// lib/services/media_service.dart

import 'dart:typed_data';
import 'package:flutter/services.dart';
import '../models/media_info.dart';

// Uncomment when adding widgets:
// import 'package:home_widget/home_widget.dart';

class MediaService {
  static const _methodChannel = MethodChannel('pt.ruifpb.openvinyl/media_control');
  static const _eventChannel  = EventChannel('pt.ruifpb.openvinyl/media_events');

  Stream<MediaInfo>? _mediaStream;

  Stream<MediaInfo> get mediaStream {
    _mediaStream ??= _eventChannel
        .receiveBroadcastStream()
        .map(_parseEvent)
        .where((info) => info != null)
        .cast<MediaInfo>();
    return _mediaStream!;
  }

  Future<bool> hasPermission() async {
    try {
      return await _methodChannel.invokeMethod<bool>('hasPermission') ?? false;
    } on PlatformException catch (e) {
      print('MediaService.hasPermission error: $e');
      return false;
    }
  }

  Future<void> requestPermission() async {
    try {
      await _methodChannel.invokeMethod('requestPermission');
    } on PlatformException catch (e) {
      print('MediaService.requestPermission error: $e');
    }
  }

  Future<MediaInfo> getCurrentMedia() async {
    try {
      final data = await _methodChannel.invokeMethod<Map>('getCurrentMedia');
      if (data == null) return MediaInfo.empty;
      return _parseMap(Map<String, dynamic>.from(data));
    } on PlatformException catch (e) {
      print('MediaService.getCurrentMedia error: $e');
      return MediaInfo.empty;
    }
  }

  /// Sends a play or pause command to the active MediaSession.
  /// Android decides which based on the current playback state,
  /// so this is a true toggle.
  Future<void> playPause() async {
    try {
      await _methodChannel.invokeMethod('playPause');
    } on PlatformException catch (e) {
      print('MediaService.playPause error: $e');
    }
  }

  // ─── Private helpers ──────────────────────────────────────────────────────

  MediaInfo? _parseEvent(dynamic event) {
    if (event == null) return null;
    try {
      final map = Map<String, dynamic>.from(event as Map);
      final info = _parseMap(map);
      // _pushToWidget(info); // uncomment when adding widgets
      return info;
    } catch (e) {
      print('MediaService._parseEvent error: $e');
      return null;
    }
  }

  MediaInfo _parseMap(Map<String, dynamic> map) {
    Uint8List? albumArt;
    if (map['albumArt'] != null) {
      albumArt = Uint8List.fromList(List<int>.from(map['albumArt']));
    }
    return MediaInfo(
      title:     map['title']     as String? ?? 'Unknown Title',
      artist:    map['artist']    as String? ?? 'Unknown Artist',
      album:     map['album']     as String? ?? '',
      albumArt:  albumArt,
      isPlaying: map['isPlaying'] as bool?   ?? false,
    );
  }

  // ── WIDGET HOOK ────────────────────────────────────────────────────────────
  // Future<void> _pushToWidget(MediaInfo info) async {
  //   await HomeWidget.saveWidgetData('title', info.title);
  //   await HomeWidget.saveWidgetData('artist', info.artist);
  //   await HomeWidget.updateWidget(androidName: 'VinylWidgetReceiver');
  // }
}