import 'dart:async';
import 'dart:typed_data';
import 'package:flutter/services.dart';

/// OPUS解码参数选项
class OpusOption {
  /// 是否具有协议头
  final bool hasHeader;
  
  /// 通道数。取值范围:[1, 2]
  final int channel;
  
  /// 采样率。参考值:{8000, 16000, 24000, 32000, 44100, 48000}
  final int sampleRate;
  
  /// 数据包长度。仅hasHeader = false时生效。
  final int packetSize;

  /// 构造函数
  OpusOption({
    this.hasHeader = false,
    this.channel = 1,
    this.sampleRate = 16000,
    this.packetSize = 40,
  });

  /// 转换为参数Map
  Map<String, dynamic> toMap() {
    return {
      'hasHeader': hasHeader,
      'channel': channel,
      'sampleRate': sampleRate,
      'packetSize': packetSize,
    };
  }
}

/// 杰理OPUS编解码器事件
class OpusEvent {
  /// 事件类型
  final String event;
  
  /// 数据类型 (file或stream)
  final String? type;
  
  /// 解码后的数据 (仅在流解码时有效)
  final Uint8List? data;
  
  /// 输出文件路径 (仅在文件解码完成时有效)
  final String? filePath;
  
  /// 错误码 (仅在发生错误时有效)
  final int? errorCode;
  
  /// 错误信息 (仅在发生错误时有效)
  final String? errorMessage;

  /// 构造函数
  OpusEvent({
    required this.event,
    this.type,
    this.data,
    this.filePath,
    this.errorCode,
    this.errorMessage,
  });

  /// 从Map构造对象
  factory OpusEvent.fromMap(Map<dynamic, dynamic> map) {
    return OpusEvent(
      event: map['event'],
      type: map['type'],
      data: map['data'],
      filePath: map['filePath'],
      errorCode: map['code'],
      errorMessage: map['message'],
    );
  }
}

/// 杰理OPUS编解码插件
class JlOpus {
  static const MethodChannel _methodChannel = MethodChannel('com.yunqiinnovation.jl_opus');
  static const EventChannel _eventChannel = EventChannel('com.yunqiinnovation.jl_opus/events');
  
  /// 事件流
  Stream<OpusEvent>? _eventStream;
  
  /// 获取事件流
  Stream<OpusEvent> get eventStream {
    _eventStream ??= _eventChannel.receiveBroadcastStream().map((event) {
      if (event is Map) {
        return OpusEvent.fromMap(event);
      }
      throw PlatformException(
        code: 'INVALID_EVENT',
        message: '无效的事件数据',
      );
    });
    return _eventStream!;
  }
  
  /// 解码后的数据流
  final StreamController<Uint8List> _decodedDataController = StreamController<Uint8List>.broadcast();
  
  /// 获取解码数据流
  Stream<Uint8List> get decodedDataStream => _decodedDataController.stream;
  
  /// 构造函数，设置事件监听
  JlOpus() {
    _setupEventListener();
  }
  
  /// 设置事件监听
  void _setupEventListener() {
    eventStream.listen((event) {
      if (event.event == 'onDecodeStream' && event.data != null) {
        _decodedDataController.add(event.data!);
      }
    });
  }
  
  /// 初始化OPUS解码器
  Future<bool> initOpusDecoder() async {
    try {
      final result = await _methodChannel.invokeMethod<bool>('initOpusDecoder');
      return result ?? false;
    } catch (e) {
      return false;
    }
  }
  
  /// 解码OPUS文件
  /// 
  /// [inPath] 输入文件路径
  /// [outPath] 输出文件路径
  /// [option] 解码参数
  Future<String?> decodeOpusFile(String inPath, String outPath, OpusOption option) async {
    try {
      final result = await _methodChannel.invokeMethod<String>(
        'decodeOpusFile',
        {
          'inPath': inPath,
          'outPath': outPath,
          ...option.toMap(),
        },
      );
      return result;
    } catch (e) {
      rethrow;
    }
  }
  
  /// 开始解码OPUS数据流
  /// 
  /// [option] 解码参数
  Future<bool> startDecodeStream(OpusOption option) async {
    try {
      final result = await _methodChannel.invokeMethod<bool>(
        'startDecodeStream',
        option.toMap(),
      );
      return result ?? false;
    } catch (e) {
      rethrow;
    }
  }
  
  /// 停止解码OPUS数据流
  Future<bool> stopDecodeStream() async {
    try {
      final result = await _methodChannel.invokeMethod<bool>('stopDecodeStream');
      return result ?? false;
    } catch (e) {
      return false;
    }
  }
  
  /// 写入OPUS音频数据进行解码
  /// 
  /// [data] OPUS音频数据
  Future<bool> writeAudioStream(Uint8List data) async {
    try {
      final result = await _methodChannel.invokeMethod<bool>(
        'writeAudioStream',
        {'data': data},
      );
      return result ?? false;
    } catch (e) {
      rethrow;
    }
  }
  
  /// 判断是否正在解码
  Future<bool> isDecoding() async {
    try {
      final result = await _methodChannel.invokeMethod<bool>('isDecoding');
      return result ?? false;
    } catch (e) {
      return false;
    }
  }
  
  /// 释放资源
  Future<bool> dispose() async {
    try {
      _decodedDataController.close();
      final result = await _methodChannel.invokeMethod<bool>('dispose');
      return result ?? false;
    } catch (e) {
      return false;
    }
  }
}