import 'dart:async';
import 'dart:typed_data';
import 'dart:io';
import 'dart:math' as math;
import 'package:get/get.dart';
import 'package:just_audio/just_audio.dart';
import 'package:audio_session/audio_session.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:flutter/services.dart';

/// 火山语音服务异常
class VolcanoTtsException implements Exception {
  final String message;
  final dynamic originalError;
  
  VolcanoTtsException(this.message, [this.originalError]);
  
  @override
  String toString() => originalError != null 
      ? '$message (原始错误: $originalError)' 
      : message;
}

/// 自定义音频源，用于从字节数组读取音频数据
class BytesAudioSource extends StreamAudioSource {
  final Uint8List _bytes;
  static const int _bufferSize = 4096;  // 4KB buffer size for better Android compatibility

  BytesAudioSource(this._bytes);

  // 添加 PCM 头信息，转换为 WAV 格式
  Uint8List _addWavHeader(Uint8List pcmData) {
    // PCM 参数
    const int sampleRate = 16000;  // 采样率
    const int numChannels = 1;     // 单声道
    const int bitsPerSample = 16;  // 16位采样
    
    // 计算数据大小
    final int dataSize = pcmData.length;
    final int fileSize = 36 + dataSize;
    
    // 创建 WAV 头
    final ByteData header = ByteData(44);
    
    // RIFF 头
    header.setUint8(0, 'R'.codeUnitAt(0));
    header.setUint8(1, 'I'.codeUnitAt(0));
    header.setUint8(2, 'F'.codeUnitAt(0));
    header.setUint8(3, 'F'.codeUnitAt(0));
    
    // 文件大小
    header.setUint32(4, fileSize, Endian.little);
    
    // WAVE 标识
    header.setUint8(8, 'W'.codeUnitAt(0));
    header.setUint8(9, 'A'.codeUnitAt(0));
    header.setUint8(10, 'V'.codeUnitAt(0));
    header.setUint8(11, 'E'.codeUnitAt(0));
    
    // fmt 子块
    header.setUint8(12, 'f'.codeUnitAt(0));
    header.setUint8(13, 'm'.codeUnitAt(0));
    header.setUint8(14, 't'.codeUnitAt(0));
    header.setUint8(15, ' '.codeUnitAt(0));
    
    // 子块大小
    header.setUint32(16, 16, Endian.little);
    
    // 音频格式 (PCM = 1)
    header.setUint16(20, 1, Endian.little);
    
    // 声道数
    header.setUint16(22, numChannels, Endian.little);
    
    // 采样率
    header.setUint32(24, sampleRate, Endian.little);
    
    // 字节率 = 采样率 * 声道数 * 采样位数 / 8
    header.setUint32(28, sampleRate * numChannels * bitsPerSample ~/ 8, Endian.little);
    
    // 块对齐 = 声道数 * 采样位数 / 8
    header.setUint16(32, numChannels * bitsPerSample ~/ 8, Endian.little);
    
    // 采样位数
    header.setUint16(34, bitsPerSample, Endian.little);
    
    // data 子块
    header.setUint8(36, 'd'.codeUnitAt(0));
    header.setUint8(37, 'a'.codeUnitAt(0));
    header.setUint8(38, 't'.codeUnitAt(0));
    header.setUint8(39, 'a'.codeUnitAt(0));
    
    // 数据大小
    header.setUint32(40, dataSize, Endian.little);
    
    // 创建完整的 WAV 数据
    final Uint8List wavData = Uint8List(44 + dataSize);
    wavData.setRange(0, 44, header.buffer.asUint8List());
    wavData.setRange(44, 44 + dataSize, pcmData);
    
    return wavData;
  }

  @override
  Future<StreamAudioResponse> request([int? start, int? end]) async {
    // 添加 WAV 头信息
    final Uint8List wavData = _addWavHeader(_bytes);
    
    start = start ?? 0;
    end = end ?? wavData.length;

    try {
      final subData = wavData.sublist(start, end);
      
      // 使用固定大小的块进行流式传输
      final chunks = <List<int>>[];
      var offset = 0;
      while (offset < subData.length) {
        final chunkSize = math.min(_bufferSize, subData.length - offset);
        chunks.add(subData.sublist(offset, offset + chunkSize));
        offset += chunkSize;
      }

      return StreamAudioResponse(
        sourceLength: wavData.length,
        contentLength: subData.length,
        offset: start,
        stream: Stream.fromIterable(chunks),
        contentType: 'audio/wav',
      );
    } catch (e) {
      print('BytesAudioSource request error: $e');
      rethrow;
    }
  }

  @override
  Future<int> get length => Future.value(_bytes.length + 44);  // PCM 数据长度 + WAV 头长度
}

/// 火山语音合成服务 (SDK版本)
class VolcanoTtsService extends GetxService {
  // 平台通道
  static const MethodChannel _channel = MethodChannel('com.example.deep_voice/volcano_tts');
  
  // 配置参数
  final String _appId;
  final String _token;
  final String _cluster;
  final String _voiceType;

  // 音频播放器
  late AudioPlayer _audioPlayer;
  final ConcatenatingAudioSource _playlist = ConcatenatingAudioSource(children: []);
  final isEnabled = true.obs;  // 默认启用
  
  // 播放状态变化通知流
  final _playingStateController = StreamController<bool>.broadcast();
  Stream<bool> get playingStateStream => _playingStateController.stream;
  
  StreamSubscription? _playbackEventSubscription;
  StreamSubscription? _playerStateSubscription;
  AudioSession? _audioSession;

  // 句子管理
  String _pendingText = '';
  final List<String> _sentenceQueue = [];
  
  // 优化的句子分割正则表达式，包含更多中英文标点
  static final _sentenceBreaks = RegExp(r'[。！？.!?;；:：,，、]');
  
  // 优化的句子分割参数
  static const int _maxSegmentLength = 150;  // 最大分段长度
  static const int _optimalSegmentLength = 80;  // 最佳分段长度
  static const int _minSegmentLength = 5;  // 最小分段长度
  
  bool _isFetching = false;
  int _consecutiveErrorCount = 0;
  static const int _maxConsecutiveErrors = 3;

  // 初始化状态
  bool _isInitialized = false;
  bool _isDisposed = false;
  
  // 性能优化参数
  final int _preloadCount = 2;  // 预加载片段数量
  final int _maxRetryAttempts = 1;  // 不进行重试
  
  // 音频质量参数
  final double _defaultVolume = 1.0;
  final double _defaultSpeed = 1.0;

  VolcanoTtsService() : 
    // 使用新的环境变量命名
    _appId = dotenv.env['VOLCANO_TTS_APP_ID'] ?? '',
    _token = dotenv.env['VOLCANO_TTS_APP_TOKEN'] ?? '',
    _cluster = dotenv.env['VOLCANO_TTS_CLUSTER'] ?? '',
    _voiceType = dotenv.env['VOLCANO_TTS_VOICE_TYPE'] ?? '' {
    if (_appId.isEmpty || _token.isEmpty || _cluster.isEmpty) {
      throw VolcanoTtsException('火山语音配置信息不完整，请检查环境变量 VOLCANO_TTS_APP_ID, VOLCANO_TTS_APP_KEY 和 VOLCANO_TTS_CLUSTER');
    }
  }


  @override
  Future<void> onInit() async {
    super.onInit();
    try {
      await _initAudioSession();
      await _initAudioPlayer();
      await _initializeTtsEngine();
    } catch (e, stackTrace) {
      print('初始化TTS服务失败: $e');
      print('Stack trace: $stackTrace');
    }
  }

  /// 初始化TTS引擎
  Future<void> _initializeTtsEngine() async {
    try {
      print('开始初始化火山语音TTS引擎，APP_ID: ${_appId.substring(0, math.min(3, _appId.length))}***，APP_KEY: ${_token.length > 10 ? "${_token.substring(0, 5)}..." : _token}');
      
      final result = await _channel.invokeMethod<bool>('initialize', {
        'appId': _appId,
        'token': _token,
        'cluster': _cluster,
      });
      
      _isInitialized = result ?? false;
      print('火山语音TTS引擎初始化${_isInitialized ? '成功' : '失败'}');
      
      if (!_isInitialized) {
        throw VolcanoTtsException('TTS引擎初始化失败');
      }
    } catch (e) {
      print('初始化火山语音TTS引擎失败: $e');
      _isInitialized = false;
      throw VolcanoTtsException('初始化失败', e);
    }
  }

  Future<void> _initAudioSession() async {
    _audioSession = await AudioSession.instance;
    
    // 针对不同平台优化音频会话配置
    if (Platform.isAndroid) {
      await _audioSession?.configure(AudioSessionConfiguration(
        avAudioSessionCategory: AVAudioSessionCategory.playback,
        androidAudioAttributes: const AndroidAudioAttributes(
          contentType: AndroidAudioContentType.speech,
          usage: AndroidAudioUsage.media,
          flags: AndroidAudioFlags.audibilityEnforced,
        ),
        androidAudioFocusGainType: AndroidAudioFocusGainType.gain,
        androidWillPauseWhenDucked: true,
      ));
    } else if (Platform.isIOS) {
      await _audioSession?.configure(AudioSessionConfiguration(
        avAudioSessionCategory: AVAudioSessionCategory.playback,
        avAudioSessionCategoryOptions: AVAudioSessionCategoryOptions.duckOthers,
        avAudioSessionMode: AVAudioSessionMode.spokenAudio,
        avAudioSessionRouteSharingPolicy: AVAudioSessionRouteSharingPolicy.defaultPolicy,
        avAudioSessionSetActiveOptions: AVAudioSessionSetActiveOptions.notifyOthersOnDeactivation,
      ));
    }
    
    // 确保音频会话激活并设置正确的音频模式
    if (Platform.isAndroid) {
      await _audioSession?.setActive(true, avAudioSessionSetActiveOptions: AVAudioSessionSetActiveOptions.notifyOthersOnDeactivation);
    } else {
      await _audioSession?.setActive(true);
    }
  }

  Future<void> _initAudioPlayer() async {
    if (_isDisposed) return;
    
    _audioPlayer = AudioPlayer();
    
    // 配置Android特定的播放参数
    if (Platform.isAndroid) {
      await _audioPlayer.setAndroidAudioAttributes(const AndroidAudioAttributes(
        contentType: AndroidAudioContentType.speech,
        usage: AndroidAudioUsage.media,
        flags: AndroidAudioFlags.audibilityEnforced,
      ));
    }
    
    // 基本播放器配置
    await _audioPlayer.setVolume(_defaultVolume);
    await _audioPlayer.setLoopMode(LoopMode.off);
    await _audioPlayer.setSpeed(_defaultSpeed);
    
    // 设置音频缓冲配置，启用预加载以减少延迟
    await _audioPlayer.setAudioSource(
      _playlist,
      initialPosition: Duration.zero,
      preload: true,
    );
    
    _setupEventListeners();
  }

  /// 合成并播放文本
  /// 
  /// [text] 要合成的文本
  /// [voiceType] 可选的语音类型，如果提供，将覆盖默认语音类型
  Future<void> speak(String text, {String? voiceType}) async {
    if (!isEnabled.value || text.trim().isEmpty) return;

    try {
      // 如果提供了语音类型，记录日志
      if (voiceType != null && voiceType != _voiceType) {
        print('使用临时语音类型: $voiceType (默认: $_voiceType)');
      }
      
      _pendingText += text;
      _extractSentences();
      await _startPreloadIfNeeded(voiceType: voiceType);
    } catch (e, stack) {
      print('语音合成失败: $e');
      print('Stack trace: $stack');
      
      _consecutiveErrorCount++;
      if (_consecutiveErrorCount >= _maxConsecutiveErrors) {
        print('连续错误次数过多，尝试重新初始化播放器');
        await _reinitializePlayer();
        _consecutiveErrorCount = 0;
      }
    }
  }

  /// 优化的文本分段算法
  void _extractSentences() {
    if (_pendingText.isEmpty) return;

    // 查找所有句子分隔符
    final matches = _sentenceBreaks.allMatches(_pendingText).toList();
    
    if (matches.isEmpty) {
      // 如果没有找到句子分隔符，按长度分割
      _splitByLength(_pendingText);
      _pendingText = '';
      return;
    }

    int lastPos = 0;
    String currentBatch = '';

    for (final match in matches) {
      final end = match.end;
      final sentence = _pendingText.substring(lastPos, end).trim();
      
      if (sentence.isEmpty) {
        lastPos = end;
        continue;
      }

      // 如果当前批次为空，直接添加句子
      if (currentBatch.isEmpty) {
        currentBatch = sentence;
      } 
      // 如果当前批次加上新句子不超过最佳长度，则合并
      else if ((currentBatch + sentence).length <= _optimalSegmentLength) {
        currentBatch += sentence;
      } 
      // 如果超过最佳长度，将当前批次加入队列，开始新批次
      else {
        if (currentBatch.isNotEmpty) {
          _sentenceQueue.add(currentBatch);
        }
        currentBatch = sentence;
      }
      
      lastPos = end;
    }

    // 处理最后一个批次
    if (currentBatch.isNotEmpty) {
      _sentenceQueue.add(currentBatch);
    }
    
    // 处理剩余的文本
    if (lastPos < _pendingText.length) {
      final remaining = _pendingText.substring(lastPos).trim();
      if (remaining.isNotEmpty) {
        if (remaining.length <= _optimalSegmentLength) {
          // 尝试与最后一个批次合并
          if (_sentenceQueue.isNotEmpty && 
              (_sentenceQueue.last + remaining).length <= _optimalSegmentLength) {
            _sentenceQueue[_sentenceQueue.length - 1] += remaining;
          } else {
            _sentenceQueue.add(remaining);
          }
        } else {
          _splitByLength(remaining);
        }
      }
    }

    _pendingText = '';
  }

  /// 按长度分割文本，优先在空格或标点处分割
  void _splitByLength(String text) {
    if (text.isEmpty) return;
    
    int start = 0;
    while (start < text.length) {
      // 计算理想的结束位置
      int end = math.min(start + _optimalSegmentLength, text.length);
      
      // 如果没有到达文本末尾，尝试在标点或空格处分割
      if (end < text.length) {
        // 在理想长度附近查找标点
        int searchStart = math.max(start + _minSegmentLength, end - 20);
        int searchEnd = math.min(text.length, end + 20);
        
        String searchText = text.substring(searchStart, searchEnd);
        final breakMatch = _sentenceBreaks.firstMatch(searchText);
        
        if (breakMatch != null) {
          end = searchStart + breakMatch.end;
        } else {
          // 如果没有找到标点，尝试在空格处分割
          final spacePos = text.lastIndexOf(' ', end);
          if (spacePos > start && spacePos > end - 20) {
            end = spacePos + 1; // 包含空格
          }
        }
      }
      
      final segment = text.substring(start, end).trim();
      if (segment.isNotEmpty) {
        // 尝试与前一个批次合并
        if (_sentenceQueue.isNotEmpty && 
            (_sentenceQueue.last + segment).length <= _optimalSegmentLength) {
          _sentenceQueue[_sentenceQueue.length - 1] += segment;
        } else {
          _sentenceQueue.add(segment);
        }
      }
      start = end;
    }
  }

  Future<void> _startPreloadIfNeeded({String? voiceType}) async {
    if (_isFetching || _sentenceQueue.isEmpty) return;
    _isFetching = true;
    await _fetchNextSegment(voiceType: voiceType);
  }

  Future<void> _fetchNextSegment({String? voiceType}) async {
    if (_sentenceQueue.isEmpty) {
      _isFetching = false;
      return;
    }

    try {
      // 预加载多个片段以实现流畅播放
      final segments = <String>[];
      while (_sentenceQueue.isNotEmpty && segments.length < _preloadCount) {
        segments.add(_sentenceQueue.removeAt(0));
      }

      for (final segment in segments) {
        print('获取音频片段: $segment');
        
        try {
          // 使用提供的语音类型或默认语音类型，只尝试一次
          final audioData = await _synthesize(segment, voiceType: voiceType);
          
          if (audioData != null) {
            print('成功获取音频数据: ${audioData.length} bytes');
            try {
              final audioSource = BytesAudioSource(audioData);
              await _playlist.add(audioSource);
              print('音频片段已添加到播放列表');

              // 如果是第一个片段且播放器未在播放，开始播放
              if (!_audioPlayer.playing && _playlist.length == 1) {
                print('开始播放');
                await _audioPlayer.play();
              }
            } catch (e) {
              print('添加音频到播放列表失败: $e');
            }
          } else {
            print('获取音频失败: 合成返回空数据');
          }
        } catch (e) {
          print('获取音频失败: $e');
          // 不重试，继续处理下一个片段
        }
      }
    } catch (e) {
      print('预加载音频片段失败: $e');
    } finally {
      _isFetching = false;
    }
  }

  /// 合成文本为音频数据
  Future<Uint8List?> _synthesize(String text, {String? voiceType}) async {
    if (text.isEmpty) {
      return null;
    }
    
    // 使用指定的语音类型，不使用任何回退
    final effectiveVoiceType = voiceType ?? _voiceType;
    
    try {
      // 调用原生方法合成语音
      final result = await _channel.invokeMethod<Uint8List>('synthesizeSync', {
        'text': text,
        'voiceType': effectiveVoiceType,
      });
      
      if (result != null && result.isNotEmpty) {
        return result;
      }
      
      // 如果没有结果，返回null
      return null;
    } catch (e) {
      // 不处理授权错误，直接抛出所有错误
      print('调用原生合成方法失败: $e');
      throw VolcanoTtsException('调用原生合成方法失败', e);
    }
  }

  /// 停止播放并清空队列
  Future<void> stop() async {
    try {
      print('停止播放');
      await _audioPlayer.stop();
      await _playlist.clear();
      _pendingText = '';
      _sentenceQueue.clear();
      _isFetching = false;
      
      // 通知播放状态变化
      _notifyPlayingStateChanged(false);
      
      // 确保清空所有待处理的音频数据
      try {
        // 重置播放器状态
        await _audioPlayer.pause();
        await _audioPlayer.seek(Duration.zero);
        
        print('已清空所有待播放的文字和音频');
      } catch (e) {
        print('清空音频缓存时出错: $e');
      }
    } catch (e) {
      print('停止播放失败: $e');
    }
  }

  /// 检查是否实际正在播放
  bool isActuallyPlaying() {
    try {
      // 检查是否有活跃的播放任务
      final hasActiveTask = _sentenceQueue.isNotEmpty || _isFetching;
      
      // 检查播放器状态
      final isPlayerPlaying = _audioPlayer.playing;
      
      // 检查是否有待处理的文本
      final hasPendingText = _pendingText.isNotEmpty;
      
      // 检查播放列表是否为空
      final hasAudioSource = _playlist.length > 0;
      
      // 检查当前播放位置
      final currentPosition = _audioPlayer.position;
      final currentDuration = _audioPlayer.duration ?? Duration.zero;
      
      // 检查是否已经播放到末尾但播放器状态未更新
      final isAtEnd = currentDuration.inMilliseconds > 0 && 
                      currentPosition.inMilliseconds >= currentDuration.inMilliseconds - 100;
      
      // 如果播放器显示正在播放，但已经到达音频末尾，则认为实际上没有播放
      if (isPlayerPlaying && isAtEnd) {
        // 如果检测到这种情况，尝试自动修复播放器状态
        _fixPlayerState();
        return false;
      }
      
      // 如果有活跃任务、播放器正在播放且未到末尾、有待处理文本，则认为正在播放
      return hasActiveTask || (isPlayerPlaying && !isAtEnd) || hasPendingText;
    } catch (e) {
      print('检查TTS实际播放状态出错: $e');
      return false;
    }
  }
  
  /// 修复播放器状态
  void _fixPlayerState() {
    try {
      // 如果播放器显示正在播放，但实际上已经到达音频末尾，尝试修复状态
      Future.microtask(() async {
        try {
          // 如果没有更多内容要播放，停止播放器
          if (_sentenceQueue.isEmpty && _pendingText.isEmpty && !_isFetching) {
            await _audioPlayer.stop();
            
            // 如果播放列表中只有已播放完的项目，清空播放列表
            if (_playlist.length > 0) {
              await _playlist.clear();
            }
            
            // 通知播放状态变化
            _notifyPlayingStateChanged(false);
          } else {
            // 如果还有内容要播放，尝试播放下一个
            _tryPlayNext();
          }
        } catch (e) {
          print('修复播放器状态失败: $e');
        }
      });
    } catch (e) {
      print('尝试修复播放器状态时出错: $e');
    }
  }
  
  /// 通知播放状态变化
  void _notifyPlayingStateChanged(bool isPlaying) {
    try {
      _playingStateController.add(isPlaying);
    } catch (e) {
      print('通知播放状态变化失败: $e');
    }
  }

  /// 重新初始化播放器
  Future<void> _reinitializePlayer() async {
    try {
      await stop();
      await _audioPlayer.dispose();
      
      // 重新初始化音频会话
      await _initAudioSession();
      
      _audioPlayer = AudioPlayer();
      await _audioPlayer.setVolume(_defaultVolume);
      await _audioPlayer.setLoopMode(LoopMode.off);
      await _audioPlayer.setSpeed(_defaultSpeed);
      
      // 重新配置Android特定的播放参数
      if (Platform.isAndroid) {
        await _audioPlayer.setAndroidAudioAttributes(const AndroidAudioAttributes(
          contentType: AndroidAudioContentType.speech,
          usage: AndroidAudioUsage.media,
          flags: AndroidAudioFlags.audibilityEnforced,
        ));
      }
      
      await _audioPlayer.setAudioSource(
        _playlist,
        initialPosition: Duration.zero,
        preload: true,
      );
      
      _setupEventListeners();
      print('播放器重新初始化成功');
    } catch (e) {
      print('播放器重新初始化失败: $e');
    }
  }

  /// 设置事件监听器
  void _setupEventListeners() {
    _playbackEventSubscription?.cancel();
    _playerStateSubscription?.cancel();
    
    _playbackEventSubscription = _audioPlayer.playbackEventStream.listen(
      (event) {
        if (_isDisposed) return;
        if (event.processingState == ProcessingState.completed) {
          _tryPlayNext();
        }
      },
      onError: (error) {
        if (_isDisposed) return;
        print('播放事件流错误: $error');
        _reinitializePlayer();
      },
    );

    _playerStateSubscription = _audioPlayer.playerStateStream.listen(
      (state) {
        if (_isDisposed) return;
        
        // 通知播放状态变化
        final isPlaying = state.playing && _playlist.length > 0;
        _notifyPlayingStateChanged(isPlaying);
        
        if (state.processingState == ProcessingState.completed) {
          _tryPlayNext();
        }
      },
      onError: (error) {
        if (_isDisposed) return;
        print('播放状态流错误: $error');
        _reinitializePlayer();
      },
    );
  }

  /// 尝试播放下一个音频片段
  Future<void> _tryPlayNext() async {
    if (_isDisposed || _playlist.length <= 0) return;
    
    try {
      if (!_audioPlayer.playing) {
        // 确保音频会话处于激活状态
        await _audioSession?.setActive(true);
        
        // 减少延迟时间
        await Future.delayed(const Duration(milliseconds: 20));
        
        if (!_isDisposed && !_audioPlayer.playing) {
          await _audioPlayer.seek(Duration.zero, index: 0);
          await _audioPlayer.play();
        }
      }
    } catch (e) {
      if (e is! StateError) {
        print('播放错误: $e');
        await _reinitializePlayer();
      }
    }
  }

  /// 切换TTS启用状态
  void toggleEnabled() {
    isEnabled.toggle();
    if (!isEnabled.value) {
      stop();
    }
  }

  /// 设置播放速度
  Future<void> setSpeed(double speed) async {
    if (speed < 0.5 || speed > 2.0) {
      throw VolcanoTtsException('播放速度必须在0.5到2.0之间');
    }
    
    try {
      await _audioPlayer.setSpeed(speed);
    } catch (e) {
      print('设置播放速度失败: $e');
    }
  }

  /// 设置音量
  Future<void> setVolume(double volume) async {
    if (volume < 0.0 || volume > 1.0) {
      throw VolcanoTtsException('音量必须在0.0到1.0之间');
    }
    
    try {
      await _audioPlayer.setVolume(volume);
    } catch (e) {
      print('设置音量失败: $e');
    }
  }

  /// 清理资源
  Future<void> _cleanupResources() async {
    _isDisposed = true;
    await _playbackEventSubscription?.cancel();
    await _playerStateSubscription?.cancel();
    await _audioSession?.setActive(false);
    await stop();
    await _audioPlayer.dispose();
    await _playingStateController.close();
    
    // 释放原生资源
    try {
      await _channel.invokeMethod('dispose');
    } catch (e) {
      print('释放原生TTS资源失败: $e');
    }
  }

  @override
  void onClose() async {
    print('关闭TTS服务');
    await _cleanupResources();
    super.onClose();
  }

  /// 获取当前语音类型
  String getCurrentVoiceType() {
    return _voiceType;
  }
  
}