deepvoice_client/lib/data/services/speech_impl/azure_ast_service.dart

import 'dart:async';
import '../../../data/models/appconfig.dart';
import 'package:flutter/services.dart';
import '../../../core/utils/logger.dart';
import 'package:get/get.dart';
import '../ast_service.dart';

/// 音频源类型
enum AudioSourceType {
  microphone, // 使用设备麦克风
  external // 使用外部提供的音频数据
}

/// Azure 语音识别服务
///
/// 该服务提供了通过平台通道与原生 Microsoft Speech SDK 交互的接口
class AzureAstService extends GetxService implements AstService {
  static final AzureAstService to = Get.put(AzureAstService());
  static const MethodChannel _channel = MethodChannel('azure_speech/ast');
  static const EventChannel _eventChannel =
      EventChannel('azure_speech/ast_events');
  // final GetStorage _storage = GetStorage();
  bool _isInitialized = false;
  late final String _subscriptionKey;
  late final String _serviceRegion;
  late String _baseUrl;
  final String _endpoint = '/'; // 修改为根路径
  late final String _accessKey;
  late final String _secretKey;
  late final String _region;
  late final String _service;

  final List<String> _defaultSupportedLanguages = ['zh-CN', 'en-US'];
  @override
  List<String> get supportedLanguages => _defaultSupportedLanguages;

  //连续识别相关
  bool _isContinuousRecognitionActive = false;
  StreamController<RecognitionEvent1>? _eventStreamController;
  StreamSubscription? _eventSubscription;

  // 最新的识别结果
  String _latestRecognizedText = '';
  String get latestRecognizedText => _latestRecognizedText;

  // 最新检测到的语言
  String _latestDetectedLanguage = '';
  String get latestDetectedLanguage => _latestDetectedLanguage;

  // 当前音频源类型
  AudioSourceType _audioSourceType = AudioSourceType.microphone;

  AzureAstService() {
    _loadConfig();
  }

  @override
  void onClose() async {
    // 页面或服务被删除时，确保释放底层资源
    await dispose();
    super.onClose();
  }

  /// 设置事件通道
  void _setupEventChannel() {
    _eventSubscription?.cancel();
    _eventSubscription = _eventChannel.receiveBroadcastStream().listen((event) {
      if (event is Map) {
        _handleRecognitionEvent(event);
      }
    }, onError: _handleRecognitionError);
  }

  /// 处理来自原生端的识别事件
  void _handleRecognitionEvent(dynamic event) {
    if (event is! Map || _eventStreamController == null) return;

    final Map<dynamic, dynamic> eventMap = event;
    final String eventType = eventMap['type'] as String? ?? '';

    // 添加日志帮助调试

    switch (eventType) {
      case 'result':
        final String text = eventMap['text'] as String? ?? '';
        final String detectedLanguage =
            eventMap['detectedLanguage'] as String? ?? '';
        _latestRecognizedText = text;
        _latestDetectedLanguage = detectedLanguage;
        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.finalResult,
          text: text,
          detectedLanguage: detectedLanguage,
        ));
        break;

      case 'recognizing':
        final String text = eventMap['text'] as String? ?? '';
        final String detectedLanguage =
            eventMap['detectedLanguage'] as String? ?? '';
        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.intermediateResult,
          text: text,
          detectedLanguage: detectedLanguage,
        ));
        break;
      case 'sessionStarted':
        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.sessionStarted,
        ));
        break;

      case 'sessionStopped':
        _isContinuousRecognitionActive = false;
        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.sessionStopped,
        ));
        break;

      case 'canceled':
        _isContinuousRecognitionActive = false;
        final String reason = eventMap['reason'] as String? ?? '';
        final String errorDetails = eventMap['errorDetails'] as String? ?? '';

        if (reason.isNotEmpty || errorDetails.isNotEmpty) {
          Logger.error('识别取消: $reason - ${errorDetails.toString()}');
        }

        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.canceled,
          error: '$reason: $errorDetails',
        ));
        break;

      case 'error':
        final String error = eventMap['message'] as String? ?? '';
        Logger.error('识别错误: ${error.toString()}');
        _eventStreamController?.add(RecognitionEvent1(
          type: RecognitionEventType1.error,
          error: error,
        ));
        break;
    }
  }

  /// 处理识别事件流错误
  void _handleRecognitionError(Object error) {
    Logger.error('识别事件流错误: ${error.toString()}');
    _eventStreamController?.addError(error);
    _cleanupEventStream();
  }

  /// 清理事件流资源
  void _cleanupEventStream() {
    _eventStreamController?.close();
    _eventStreamController = null;
    _isContinuousRecognitionActive = false;
  }

  /// 从环境变量加载配置
  void _loadConfig() {
    // final _env = _storage.read("ENV") as Map<String, String>;
    _subscriptionKey = AppConfig.env('AZURE_SPEECH_KEY') ?? '';
    _serviceRegion = AppConfig.env('AZURE_SPEECH_REGION') ?? '';
    _accessKey = AppConfig.env('VOLCANO_TRANSLATION_ACCESS_KEY') ?? '';
    _secretKey = AppConfig.env('VOLCANO_TRANSLATION_SECRET_KEY') ?? '';
    _region = AppConfig.env('VOLCANO_TRANSLATION_REGION') ?? 'cn-north-1';
    _service = 'translate';
    _baseUrl = 'https://translate.volcengineapi.com';
    if (_subscriptionKey.isEmpty || _serviceRegion.isEmpty) {
      throw Exception(
          '未找到 Azure 语音服务配置。请在 .env 文件中设置 AZURE_SPEECH_KEY 和 AZURE_SPEECH_REGION');
    }
  }

  @override
  Future<Stream<RecognitionEvent1>> recognizeCallback() async {
    if (!_isInitialized) {
      await initialize();
    }
    try {
      _eventStreamController = StreamController<RecognitionEvent1>.broadcast();

      // 开始连续识别
      final bool result = await _channel.invokeMethod('recognizeCallback');
      if (!result) {
        _cleanupEventStream();
      }

      return _eventStreamController!.stream;
    } catch (e) {
      Logger.error('开始连续语音识别失败: ${e.toString()}');
      rethrow;
    }
  }

  @override
  Future<bool> enableRecord(String filePath) async {
    try {
      final bool result = await _channel.invokeMethod('enableRecord', {
        'filePath': filePath,
      });

      return result;
    } catch (e) {
      Logger.error('开始录音: ${e.toString()}');
      rethrow;
    }
  }

  @override
  Future<bool> path(String filePath) async {
    try {
      final bool result = await _channel.invokeMethod('path', {
        'filePath': filePath,
      });

      return result;
    } catch (e) {
      Logger.error('开始录音: ${e.toString()}');
      rethrow;
    }
  }

  @override
  Future<bool> startContinuousTranslation() async {
    try {
      final bool result =
          await _channel.invokeMethod('startContinuousTranslation');

      return result;
    } catch (e) {
      Logger.error('停止录音: ${e.toString()}');
      rethrow;
    }
  }

  @override
  Future<bool> stopContinuousTranslation() async {
    try {
      final bool result =
          await _channel.invokeMethod('stopContinuousTranslation');

      return result;
    } catch (e) {
      Logger.error('停止录音: ${e.toString()}');
      rethrow;
    }
  }

  @override
  Future<void> dispose() async {
    try {
      // 取消事件订阅，关闭事件流，重置状态（补充释放，避免监听残留）
      await _eventSubscription?.cancel();
      _eventSubscription = null;
      await _eventStreamController?.close();
      _eventStreamController = null;

      // 通知原生端释放资源，并重置初始化标记
      await _channel.invokeMethod('dispose');
      _isInitialized = false;
      Logger.info('Azure AST 资源已释放');
    } catch (e) {
      Logger.error('Azure AST 资源释放失败: ${e.toString()}');
      _isInitialized = false;
    }
  }

  @override
  Future<bool> initialize({
    List<String>? supportedLanguages,
    bool useExternalAudio = false,
    bool useEchoCancellation = false,
  }) async {
    try {
      final List<String> languages =
          supportedLanguages ?? _defaultSupportedLanguages;
//底层会初始化前释放
      // // 检查是否需要重新初始化
      // if (_isInitialized) {
      //   await dispose();
      // }

      // 设置音频源类型
      _audioSourceType = useExternalAudio
          ? AudioSourceType.external
          : AudioSourceType.microphone;
// Future<bool> initialize({
//     required String subscriptionKey,
//     required String region,
//     required List<String> supportedLanguages,
//     required String audioSourceType,
//     required String translationAccessKey,
//     required String translationSecretKey,
//     String translationRegion = 'cn-north-1',
//   });

      final bool result = await _channel.invokeMethod('initialize', {
        'subscriptionKey': _subscriptionKey,
        'region': _serviceRegion,
        'supportedLanguages': languages,
        'audioSourceType': _audioSourceType.toString().split('.').last,
        'translationAccessKey': _accessKey,
        'translationSecretKey': _secretKey,
        'translationRegion': _region,
      });

      _isInitialized = result;
      _setupEventChannel();
      Logger.info('Azure 语音识别服务初始化${result ? '成功' : '失败'}');
      return result;
    } catch (e) {
      Logger.error('Azure 语音识别服务初始化失败: ${e.toString()}');
      _isInitialized = false;
      rethrow;
    }
  }
}