import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'dart:async';
import 'dart:convert';
import 'package:get_storage/get_storage.dart';
import '../../../data/services/volcano_translation_service.dart';
import '../../../data/services/azure_asr_service.dart';
import '../../../data/services/azure_tts_service.dart';
import '../../../data/services/language_manager.dart';
import '../../../core/utils/logger.dart';
import '../../../data/services/voice_interaction_service.dart';
class TranslationController extends GetxController {
  // 服务
  final AzureAsrService _asrService = Get.find<AzureAsrService>();
  final VolcanoTranslationService _translationService = Get.find<VolcanoTranslationService>();
  final AzureTtsService _ttsService = Get.find<AzureTtsService>();
  final LanguageManager _languageManager = Get.find<LanguageManager>();
  final GetStorage _storage = GetStorage();
  final VoiceInteractionService _voiceInteractionService = Get.find<VoiceInteractionService>();

  // 存储相关
  static const String _historyKey = 'translation_history';
  static const String _sourceLanguageKey = 'translation_source_language';
  static const String _targetLanguageKey = 'translation_target_language';
  static const int _maxHistoryItems = 100;

  // 状态变量
  final isRecognizing = false.obs;
  final isTranslating = false.obs;
  final isTtsEnabled = true.obs;
  
  // 语言相关
  final sourceLanguage = '中文(简体)'.obs;
  final targetLanguage = '英语'.obs;
  final sourceLanguageCode = 'zh-CN'.obs;
  final targetLanguageCode = 'en-US'.obs;
  var detectedLanguageCode = '';
  
  // 翻译历史和当前项
  final translationHistory = <TranslationItem>[].obs;
  final Rx<TranslationItem?> currentItem = Rx<TranslationItem?>(null);
  String? currentSessionId;
  
  // UI相关
  final ScrollController scrollController = ScrollController();
  
  // 其他
  StreamSubscription? _recognitionSubscription;
  StreamSubscription? _voiceInteractionSubscription;
  Timer? _translationDebounceTimer;

  // 获取支持的语言列表
  Map<String, String> get supportedLanguages => _languageManager.getChineseNameToAsrCodeMap();

  @override
  void onInit() {
    super.onInit();
    
    // 加载上次保存的语言设置
    _loadSavedLanguages();
    
    // 初始化语言代码
    final sourceAsrCode = _languageManager.getAsrCodeByChineseName(sourceLanguage.value);
    if (sourceAsrCode != null) {
      sourceLanguageCode.value = sourceAsrCode;
    }
    
    final targetAsrCode = _languageManager.getAsrCodeByChineseName(targetLanguage.value);
    if (targetAsrCode != null) {
      targetLanguageCode.value = targetAsrCode;
    }
    
        // 订阅VoiceInteractionService事件
    _subscribeToVoiceInteractionEvents();

    // 加载历史记录
    loadTranslationHistory();
    
    // 初始化服务
    _initServices();
    
    // 使用微任务在布局完成后自动滚动到底部
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _scrollToBottom();
      
      // 额外的延迟滚动，确保在复杂视图中也能正确滚动
      Future.delayed(const Duration(milliseconds: 500), () {
        _scrollToBottom();
      });
    });
  }
  
    /// 订阅VoiceInteractionService事件
  void _subscribeToVoiceInteractionEvents() {
    if (_voiceInteractionService.eventStream != null) {
      _voiceInteractionSubscription = _voiceInteractionService.eventStream!.listen((event) {
        if (event is RecognitionStartedEvent) {
          // 收到recognitionStarted事件时，停止当前的AI交互、录音和TTS
         stopAll();
        } 
      });
    }
  }

  // 加载保存的语言设置
  void _loadSavedLanguages() {
    final savedSourceLanguage = _storage.read(_sourceLanguageKey);
    final savedTargetLanguage = _storage.read(_targetLanguageKey);
    
    if (savedSourceLanguage != null && supportedLanguages.containsKey(savedSourceLanguage)) {
      sourceLanguage.value = savedSourceLanguage;
    }
    
    if (savedTargetLanguage != null && supportedLanguages.containsKey(savedTargetLanguage)) {
      targetLanguage.value = savedTargetLanguage;
    }
  }
  
  // 保存当前语言设置
  void _saveLanguageSettings() {
    _storage.write(_sourceLanguageKey, sourceLanguage.value);
    _storage.write(_targetLanguageKey, targetLanguage.value);
  }
  
  // 初始化服务
  Future<void> _initServices() async {
    try {
      await _translationService.initialize();
      
      final List<String> asrSupportedLanguages = [sourceLanguageCode.value, targetLanguageCode.value];
      await _ttsService.initialize();
      await _asrService.initialize(
        autoDetectLanguage: true,
        supportedLanguages: asrSupportedLanguages,
      );
    } catch (e) {
      Logger.error('初始化服务失败: $e');
    }
  }

  @override
  void onClose() {
    stopRecognition();
    _recognitionSubscription?.cancel();
    _voiceInteractionSubscription?.cancel();
    _translationDebounceTimer?.cancel();
    scrollController.dispose();
    super.onClose();
  }

  // 切换TTS功能
  void toggleTts() => isTtsEnabled.toggle();

  // 开始语音识别
  Future<void> startRecognition() async {
    if (isRecognizing.value) return;

    _voiceInteractionService.pauseVoiceInteraction();

    try {
      // 更新ASR支持的语言
      final List<String> asrSupportedLanguages = [sourceLanguageCode.value, targetLanguageCode.value];
      await _asrService.setSupportedLanguages(asrSupportedLanguages);
      
      currentSessionId = DateTime.now().millisecondsSinceEpoch.toString();

      // 初始化新的翻译项
      currentItem.value = TranslationItem(
        sourceText: '',
        translatedText: '',
        sourceLanguageCode: sourceLanguageCode.value,
        targetLanguageCode: targetLanguageCode.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: true,
      );
      
      // 开始连续语音识别
      final recognitionStream = await _asrService.startContinuousRecognition();
      isRecognizing.value = true;

      // 监听识别结果
      _recognitionSubscription?.cancel();
      _recognitionSubscription = recognitionStream.listen(_handleRecognitionEvent);
    } catch (e) {
      isRecognizing.value = false;
      Logger.error('启动语音识别失败: $e');
    }
  }

  // 处理识别事件
  void _handleRecognitionEvent(RecognitionEvent event) {
    if (event.type == RecognitionEventType.finalResult && event.text.isNotEmpty) {
      detectedLanguageCode = event.detectedLanguage;
      handleFinalResult(event.text);
    } else if (event.type == RecognitionEventType.intermediateResult && event.text.isNotEmpty) {
      if (event.detectedLanguage.isNotEmpty) {
        detectedLanguageCode = event.detectedLanguage;
      }
      handleIntermediateResult(event.text);
    } else if (event.type == RecognitionEventType.error) {
      isRecognizing.value = false;
      Logger.error('语音识别错误: ${event.error}');
    } else if (event.type == RecognitionEventType.canceled) {
      isRecognizing.value = false;
      Logger.error('语音识别取消: ${event.error}');
    }
  }

  // 停止语音识别
  Future<void> stopRecognition() async {
    if (!isRecognizing.value) return;

    try {
      await _asrService.stopContinuousRecognition();
      _recognitionSubscription?.cancel();
      _recognitionSubscription = null;
      isRecognizing.value = false;
      
      // 如果当前有中间结果，将其作为最终结果处理
      if (currentItem.value != null && currentItem.value!.sourceText.isNotEmpty) {
        // 标记为最终结果
        currentItem.value!.isIntermediate = false;
        
        // 如果还没有翻译结果，尝试翻译
        if (currentItem.value!.translatedText.isEmpty) {
          await translateText(currentItem.value!.sourceText);
        }
        
        translationHistory.add(currentItem.value!);
        saveTranslationHistory();
      }
      
      currentSessionId = null;
      currentItem.value = null;
    } catch (e) {
      Logger.error('停止语音识别失败: $e');
    }
  }

  // 处理中间识别结果
  void handleIntermediateResult(String text) {
    if (text.isEmpty) return;

    if (currentItem.value == null) {
      currentSessionId ??= DateTime.now().millisecondsSinceEpoch.toString();
      currentItem.value = TranslationItem(
        sourceText: text,
        translatedText: '',
        sourceLanguageCode: sourceLanguageCode.value,
        targetLanguageCode: targetLanguageCode.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: translationHistory.isEmpty || translationHistory.last.sessionId != currentSessionId,
        isIntermediate: true,
      );
      // 添加新项后滚动到底部
      _scrollToBottom();
    } else {
      // 更新当前项
      currentItem.value!.sourceText = text;
      currentItem.value!.isIntermediate = true;
      currentItem.refresh();
      // 更新后滚动到底部
      _scrollToBottom();
    }

    // 防抖处理翻译请求
    _translationDebounceTimer?.cancel();
    _translationDebounceTimer = Timer(const Duration(milliseconds: 300), () {
      if (currentItem.value != null && currentItem.value!.sourceText.isNotEmpty) {
        translateText(currentItem.value!.sourceText);
      }
    });
  }

  // 处理最终识别结果
  Future<void> handleFinalResult(String text) async {
    if (text.isEmpty || currentItem.value == null) return;

    // 更新当前项，但不立即添加到历史记录
    currentItem.value!.sourceText = text;
    currentItem.value!.isIntermediate = false;
    currentItem.refresh();
    // 更新后滚动到底部
    _scrollToBottom();
    
    // 先翻译，保持UI稳定
    final translationResult = await translateText(text);
    
    // 翻译完成后再添加到历史记录
    if (currentItem.value != null) {
      translationHistory.add(currentItem.value!);
      saveTranslationHistory();
      // 添加到历史记录后滚动到底部
      _scrollToBottom();
      
      // 播放TTS
      if (translationResult != null && isTtsEnabled.value) {
        await playTranslatedText(translationResult);
      }
      
      // 重置当前项，准备下一次输入
      currentItem.value = null;
    }
  }

  // 翻译文本
  Future<String?> translateText(String sourceText) async {
    if (sourceText.isEmpty) return null;

    isTranslating.value = true;
    String? translationResult;

    try {
      // 根据检测到的语言确定源语言和目标语言
      final bool shouldSwap = detectedLanguageCode == sourceLanguageCode.value;
      final detectedSourceLanguageCode = shouldSwap ? sourceLanguageCode.value : targetLanguageCode.value;
      final detectedTargetLanguageCode = shouldSwap ? targetLanguageCode.value : sourceLanguageCode.value;

      // 调用翻译服务
      translationResult = await _translationService.translateText(
        text: sourceText,
        sourceLanguageCode: detectedSourceLanguageCode,
        targetLanguageCode: detectedTargetLanguageCode,
      );

      if (translationResult != null) {
        // 更新翻译结果
        if (currentItem.value != null && currentItem.value!.sourceText.contains(sourceText)) {
          // 更新当前项
          currentItem.value!.translatedText = translationResult;
          currentItem.value!.sourceLanguageCode = detectedSourceLanguageCode;
          currentItem.value!.targetLanguageCode = detectedTargetLanguageCode;
          currentItem.refresh();
          // 更新后滚动到底部
          _scrollToBottom();
        } else {
          // 更新历史记录
          final index = translationHistory.indexWhere((item) => item.sourceText == sourceText);
          if (index != -1) {
            translationHistory[index].translatedText = translationResult;
            translationHistory[index].sourceLanguageCode = detectedSourceLanguageCode;
            translationHistory[index].targetLanguageCode = detectedTargetLanguageCode;
            translationHistory.refresh();
            saveTranslationHistory();
            // 更新后滚动到底部
            _scrollToBottom();
          }
        }
      }
    } catch (e) {
      Logger.error('翻译失败: $e');
    } finally {
      isTranslating.value = false;
    }

    return translationResult;
  }

  // 播放翻译文本
  Future<void> playTranslatedText(String text) async {
    if (text.isEmpty) return;

    try {
      final bool shouldSwap = detectedLanguageCode == targetLanguageCode.value;
      final detectedTargetLanguageCode = shouldSwap ? sourceLanguageCode.value : targetLanguageCode.value;
      final voiceName = _languageManager.getTtsVoiceNameByAsrCode(detectedTargetLanguageCode) ?? 'en-US-AriaNeural';
      
      await _ttsService.setVoice(voiceName);
      await _ttsService.speak(text);
    } catch (e) {
      Logger.error('播放翻译失败: $e');
    }
  }

  // 停止所有操作
  Future<void> stopAll() async {
    try {
      if (isRecognizing.value) {
        await stopRecognition();
      }
      
      _translationDebounceTimer?.cancel();
      await _ttsService.stop();
    } catch (e) {
      Logger.error('停止操作失败: $e');
    }
  }

  // 播放特定翻译项
  Future<void> playTranslationItem(TranslationItem item) async {
    if (item.translatedText.isEmpty) return;
    
    try {
      final voiceName = _languageManager.getTtsVoiceNameByAsrCode(item.targetLanguageCode) ?? 'en-US-AriaNeural';
      await _ttsService.setVoice(voiceName);
      await _ttsService.speak(item.translatedText);
    } catch (e) {
      Logger.error('播放翻译项失败: $e');
    }
  }

  // 播放文本
  Future<void> playText(String text, {String? languageCode}) async {
    if (text.isEmpty) return;
    
    try {
      final voiceName = languageCode != null 
          ? _languageManager.getTtsVoiceNameByAsrCode(languageCode) ?? 'en-US-AriaNeural'
          : _languageManager.getTtsVoiceNameByAsrCode(targetLanguageCode.value) ?? 'en-US-AriaNeural';
      
      await _ttsService.setVoice(voiceName);
      await _ttsService.speak(text);
    } catch (e) {
      Logger.error('播放文本失败: $e');
    }
  }

  // 滚动到底部
  void _scrollToBottom() {
    if (scrollController.hasClients && (translationHistory.isNotEmpty || currentItem.value != null)) {
      try {
        scrollController.animateTo(
          scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 300),
          curve: Curves.easeOut,
        );
      } catch (e) {
        Logger.error('滚动到底部失败: $e');
      }
    }
  }

  // 设置滚动监听器（简化版，不再需要实际监听）
  void setupScrollListener() {
    // 简化后的空方法，保留接口兼容性
  }
  
  // 底部控制栏高度
  double _bottomBarHeight = 0.0;
  
  // 设置底部控制栏高度
  void setBottomBarHeight(double height) {
    _bottomBarHeight = height;
  }
  
  // 获取底部控制栏高度
  double get bottomBarHeight => _bottomBarHeight;

  // 切换源语言和目标语言
  void swapLanguages() {
    stopAll();
    
    final tempName = sourceLanguage.value;
    sourceLanguage.value = targetLanguage.value;
    targetLanguage.value = tempName;
    
    final tempCode = sourceLanguageCode.value;
    sourceLanguageCode.value = targetLanguageCode.value;
    targetLanguageCode.value = tempCode;
    
    // 保存语言设置
    _saveLanguageSettings();
  }

  // 设置源语言
  void setSourceLanguage(String language) {
    if (sourceLanguage.value != language) {
      stopAll();
      
      sourceLanguage.value = language;
      
      final asrCode = _languageManager.getAsrCodeByChineseName(language);
      if (asrCode != null) {
        sourceLanguageCode.value = asrCode;
      }
      
      // 保存语言设置
      _saveLanguageSettings();
    }
  }

  // 设置目标语言
  void setTargetLanguage(String language) {
    if (targetLanguage.value != language) {
      stopAll();
      
      targetLanguage.value = language;
      
      final asrCode = _languageManager.getAsrCodeByChineseName(language);
      if (asrCode != null) {
        targetLanguageCode.value = asrCode;
      }
      
      // 保存语言设置
      _saveLanguageSettings();
    }
  }

  // 加载翻译历史
  void loadTranslationHistory() {
    final historyJson = _storage.read(_historyKey);
    if (historyJson != null) {
      try {
        final List<dynamic> historyList = jsonDecode(historyJson);
        translationHistory.value = historyList.map((item) => TranslationItem.fromJson(item)).toList();
        
        // 使用微任务确保在视图完全渲染后滚动到底部
        WidgetsBinding.instance.addPostFrameCallback((_) {
          _scrollToBottom();
        });
      } catch (e) {
        _storage.remove(_historyKey);
        Logger.error('加载翻译历史失败: $e');
      }
    }
  }

  // 保存翻译历史
  void saveTranslationHistory() {
    if (translationHistory.length > _maxHistoryItems) {
      translationHistory.removeRange(0, translationHistory.length - _maxHistoryItems);
    }

    try {
      final List<Map<String, dynamic>> historyJson = translationHistory.map((item) => item.toJson()).toList();
      _storage.write(_historyKey, jsonEncode(historyJson));
    } catch (e) {
      Logger.error('保存翻译历史失败: $e');
    }
  }

  // 清除翻译历史
  void clearTranslationHistory() {
    translationHistory.clear();
    _storage.remove(_historyKey);
  }

  // 滚动到底部 (公共方法，用于向后兼容)
  void scrollToBottom({bool animate = true}) {
    _scrollToBottom();
  }
}

// 翻译项模型
class TranslationItem {
  String sourceText;
  String translatedText;
  String sourceLanguageCode;
  String targetLanguageCode;
  final DateTime timestamp;
  String sessionId;
  final bool isFirstInSession;
  bool isIntermediate; // 是否为中间结果

  TranslationItem({
    required this.sourceText,
    required this.translatedText,
    required this.sourceLanguageCode,
    required this.targetLanguageCode,
    required this.timestamp,
    required this.sessionId,
    this.isFirstInSession = false,
    this.isIntermediate = false,
  });

  factory TranslationItem.fromJson(Map<String, dynamic> json) {
    DateTime timestamp;
    try {
      timestamp = DateTime.parse(json['timestamp']);
    } catch (e) {
      timestamp = DateTime.now();
    }

    return TranslationItem(
      sourceText: json['sourceText'] ?? '',
      translatedText: json['translatedText'] ?? '',
      sourceLanguageCode: json['sourceLanguageCode'] ?? 'zh-CN',
      targetLanguageCode: json['targetLanguageCode'] ?? 'en-US',
      timestamp: timestamp,
      sessionId: json['sessionId'] ?? DateTime.now().millisecondsSinceEpoch.toString(),
      isFirstInSession: json['isFirstInSession'] ?? false,
      isIntermediate: false, // 从存储加载的都是最终结果
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'sourceText': sourceText,
      'translatedText': translatedText,
      'sourceLanguageCode': sourceLanguageCode,
      'targetLanguageCode': targetLanguageCode,
      'timestamp': timestamp.toIso8601String(),
      'sessionId': sessionId,
      'isFirstInSession': isFirstInSession,
      // 不保存isIntermediate，因为存储的都是最终结果
    };
  }
  
  // 获取源语言的中文名称
  String get sourceLanguageName {
    final languageManager = Get.find<LanguageManager>();
    return languageManager.getChineseNameByAsrCode(sourceLanguageCode) ?? '未知语言';
  }
  
  // 获取目标语言的中文名称
  String get targetLanguageName {
    final languageManager = Get.find<LanguageManager>();
    return languageManager.getChineseNameByAsrCode(targetLanguageCode) ?? '未知语言';
  }
}