import 'dart:async';
import 'package:get/get.dart';
import '../../../data/services/azure_asr_service.dart';
import '../../../core/utils/logger.dart';

// Azure语音识别状态枚举
enum AzureAsrState {
  notInitialized,  // 未初始化
  initialized,     // 已初始化
  listening,       // 正在监听
  notListening,    // 未监听
  error,           // 错误
}

class AzureAsrTestController extends GetxController {
  // 服务引用
  final AzureAsrService _azureAsrService = Get.find<AzureAsrService>();
  
  // 状态变量
  final RxBool isListening = false.obs;
  final RxString recognizedText = ''.obs;
  final RxString partialText = ''.obs;
  final Rx<AzureAsrState> asrState = AzureAsrState.notInitialized.obs;
  
  // 语言选项
  final RxString selectedLanguage = 'zh-CN'.obs;
  final List<String> availableLanguages = [
    'zh-CN', // 中文（中国大陆）
    'en-US', // 英语（美国）
    'ja-JP', // 日语
    'ko-KR', // 韩语
    'fr-FR', // 法语
    'de-DE', // 德语
    'es-ES', // 西班牙语
    'it-IT', // 意大利语
    'pt-BR', // 葡萄牙语（巴西）
    'ru-RU', // 俄语
  ];
  
  // 订阅
  StreamSubscription? _recognitionSubscription;
  
  @override
  void onInit() {
    super.onInit();
    _initializeAsr();
  }
  
  // 初始化ASR服务
  Future<void> _initializeAsr() async {
    try {
      final success = await _azureAsrService.initialize(language: selectedLanguage.value);
      asrState.value = success ? AzureAsrState.initialized : AzureAsrState.error;
    } catch (e) {
      Logger.error('初始化ASR服务失败: $e');
      asrState.value = AzureAsrState.error;
    }
  }
  
  // 开始简单语音识别
  Future<void> startSimpleRecognition() async {
    try {
      if (asrState.value == AzureAsrState.notInitialized) {
        await _initializeAsr();
      }
      
      // 如果正在进行连续识别，先停止
      if (_azureAsrService.isContinuousRecognitionActive()) {
        await stopContinuousRecognition();
      }
      
      partialText.value = '';
      final result = await _azureAsrService.recognizeSpeech();
      if (result.isNotEmpty) {
        recognizedText.value = result;
      }
    } catch (e) {
      Logger.error('开始简单语音识别出错: $e');
      asrState.value = AzureAsrState.error;
    }
  }
  
  // 切换连续语音识别
  Future<void> toggleContinuousRecognition() async {
    try {
      if (asrState.value == AzureAsrState.notInitialized) {
        await _initializeAsr();
      }
      
      if (_azureAsrService.isContinuousRecognitionActive()) {
        await stopContinuousRecognition();
      } else {
        await startContinuousRecognition();
      }
    } catch (e) {
      Logger.error('切换连续语音识别出错: $e');
      asrState.value = AzureAsrState.error;
    }
  }
  
  // 开始连续语音识别
  Future<void> startContinuousRecognition() async {
    try {
      if (_azureAsrService.isContinuousRecognitionActive()) {
        await stopContinuousRecognition();
      }
      
      _recognitionSubscription?.cancel();
      _recognitionSubscription = null;
      
      isListening.value = true;
      asrState.value = AzureAsrState.listening;
      partialText.value = '';
      
      final stream = await _azureAsrService.startContinuousRecognition();
      
      _recognitionSubscription = stream.listen(
        (event) {
          switch (event.type) {
            case RecognitionEventType.finalResult:
              if (event.text.isNotEmpty) {
                recognizedText.value = event.text;
              }
              partialText.value = '';
              break;
              
            case RecognitionEventType.intermediateResult:
              if (event.text.isNotEmpty) {
                partialText.value = event.text;
              }
              break;
              
            case RecognitionEventType.sessionStarted:
              isListening.value = true;
              asrState.value = AzureAsrState.listening;
              break;
              
            case RecognitionEventType.sessionStopped:
              isListening.value = false;
              asrState.value = AzureAsrState.notListening;
              partialText.value = '';
              break;
              
            case RecognitionEventType.canceled:
              isListening.value = false;
              asrState.value = AzureAsrState.notListening;
              partialText.value = '';
              break;
              
            case RecognitionEventType.error:
              asrState.value = AzureAsrState.error;
              isListening.value = false;
              partialText.value = '';
              _initializeAsr();
              break;
          }
        },
        onError: (error) {
          asrState.value = AzureAsrState.error;
          isListening.value = false;
          partialText.value = '';
        },
        onDone: () {
          if (!_azureAsrService.isContinuousRecognitionActive()) {
            isListening.value = false;
            asrState.value = AzureAsrState.notListening;
          }
        },
      );
    } catch (e) {
      Logger.error('开始连续语音识别出错: $e');
      asrState.value = AzureAsrState.error;
      isListening.value = false;
      partialText.value = '';
    }
  }
  
  // 停止连续语音识别
  Future<void> stopContinuousRecognition() async {
    try {
      isListening.value = false;
      asrState.value = AzureAsrState.notListening;
      
      await _azureAsrService.stopContinuousRecognition();
      
      _recognitionSubscription?.cancel();
      _recognitionSubscription = null;
      
      partialText.value = '';
    } catch (e) {
      Logger.error('停止连续语音识别出错: $e');
      asrState.value = AzureAsrState.error;
    }
  }
  
  // 更改语言
  Future<void> changeLanguage(String language) async {
    try {
      if (selectedLanguage.value == language) return;
      
      selectedLanguage.value = language;
      
      if (_azureAsrService.isContinuousRecognitionActive()) {
        await stopContinuousRecognition();
      }
      
      final success = await _azureAsrService.setRecognitionLanguage(language);
      asrState.value = success ? AzureAsrState.initialized : AzureAsrState.error;
      
      recognizedText.value = '';
      partialText.value = '';
    } catch (e) {
      Logger.error('更改语言出错: $e');
      asrState.value = AzureAsrState.error;
    }
  }
  
  @override
  void onClose() {
    _recognitionSubscription?.cancel();
    _recognitionSubscription = null;
    
    if (_azureAsrService.isContinuousRecognitionActive()) {
      _azureAsrService.stopContinuousRecognition();
    }
    
    super.onClose();
  }
}