import 'dart:io';

import 'package:deep_voice/core/utils/permission_util.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'dart:async';
import 'dart:convert';
import 'package:get_storage/get_storage.dart';
import 'package:intl/intl.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import '../../../data/services/volcano_translation_service.dart';
import '../../../data/services/tts_service.dart';
import '../../../data/services/language_manager.dart';
import '../../../core/utils/logger.dart';
import '../../../data/models/events/voice_interaction_event.dart';
import '../../../data/services/asr_service.dart';
import '../../../data/services/ble_manager.dart';

class TranslationController extends GetxController {
  // 服务
  final AsrService _asrService = Get.find<AsrService>();
  final VolcanoTranslationService _translationService =
      Get.find<VolcanoTranslationService>();
  final TtsService _ttsService = Get.find<TtsService>();
  final LanguageManager _languageManager = Get.find<LanguageManager>();
  final GetStorage _storage = GetStorage();
  // 蓝牙服务
  final _bleManager = Get.find<BleManager>();
  // 音频输入源
  bool _audioSourceType = false;
  // 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 = 10;

  // 状态变量
  final isRecognizing = false.obs;
  final isTranslating = false.obs;
  final isTtsEnabled = true.obs;
  final isRecording = false.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 = '';

  final currentModeTitle = 'simultaneousTranslation'.obs;
  final currentMode = 'simultaneous'.obs;
  // 翻译历史和当前项
  final translationHistory = <TranslationItem>[].obs;
  String? currentSessionId;
  final appDocDir = getApplicationDocumentsDirectory();
  var appDir;
  var dir;
  Future<void> changeTranslationMode(String mode) async {
    currentMode.value = mode;
    currentModeTitle.value = _getModeTitle(mode);

    stopAll();
  }

  String _getModeTitle(String mode) {
    switch (mode) {
      case 'audioVideo':
        return 'audioVideoTranslation';
      case 'call':
        return 'callTranslation';
      case 'faceToFace':
        return 'faceToFaceTranslation';

      default:
        return 'simultaneousTranslation';
    }
  }

  // 兼容旧版视图的计算属性
  Rx<TranslationItem?> get currentItem {
    if (translationHistory.isNotEmpty &&
        translationHistory.last.isIntermediate) {
      return Rx<TranslationItem?>(translationHistory.last);
    }
    return Rx<TranslationItem?>(null);
  }

  // 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();

    //_setupEventListeners();
    // 加载上次保存的语言设置
    _loadSavedLanguages();
    _requestStoragePermission();
    // 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;
    }

    // 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();
    });
  }

  // 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);
  }

  Future<bool> _requestRecordPermission() async {
    try {
      final bool granted = await PermissionUtil.instance.requestPermission(
        permissionType: Permission.microphone,
        permissionName: "录音",
        explanationText: "我们需要访问麦克风权限，以便您录制音频内容。",
        permanentDenialText: "检测到您已永久拒绝录音权限。如需继续使用此功能，请前往应用设置中手动开启麦克风权限。",
      );

      if (granted) {
        Logger.d("Permission", "用户授予了录音权限");
        return true;
      } else {
        Logger.d("Permission", "用户未授予录音权限");
        return false;
      }
    } catch (e) {
      Logger.e("Permission", "请求录音权限时出错: $e");
      return false;
    }
  }

  // 请求存储权限
  void _requestStoragePermission() async {
    // final BuildContext context = Get.overlayContext!;

    PermissionUtil.instance
        .requestPermission(
      // context: context,
      permissionType: Permission.storage,
      permissionName: "存储",
      explanationText: "我们需要访问存储权限，以便您可以选择并上传音频文件。",
      permanentDenialText: "检测到您已永久拒绝存储权限。如需继续使用此功能，请前往应用设置中手动开启存储权限。",
    )
        .then((granted) {
      if (granted) {
        Logger.d("Permission", "用户授予了存储权限");
      } else {
        Logger.d("Permission", "用户未授予存储权限");
        // 可以提示用户无法进行文件操作
      }
    });
  }
  // /// 设置事件监听器
  // void _setupEventListeners() {
  //   // 监听扫描结果
  //   _scanSubscription = jieli.scanResults.listen((devices) {
  //     scannedDevices.assignAll(devices);
  //   });

  //   // 监听唤醒信号
  //   _wakeupSubscription = jieli.wakeupStream.listen((wakeup) {
  //     wakeupReceived.value = true;
  //     Get.snackbar('收到唤醒信号', '耳机发送了唤醒信号');
  //   });
  // }

  // 初始化服务
  Future<void> _initServices() async {
    try {
      await _translationService.initialize();

      // 初始化 ASR 服务时，明确指定需要支持的语言
      final List<String> asrSupportedLanguages = [
        sourceLanguageCode.value,
        targetLanguageCode.value
      ];
      Logger.info('初始化ASR服务，支持语言: $asrSupportedLanguages');

      await _asrService.initialize(
        supportedLanguages: asrSupportedLanguages,
      );
      appDir = await appDocDir; // 先 await 获取目录
      dir = Directory("${appDir.path}/TranslatAudio");
      if (!await dir.exists()) {
        await dir.create(recursive: true); // Add recursive creation
      }
      Logger.info('所有服务初始化完成');
    } catch (e) {
      Logger.error('初始化服务失败: ${e.toString()}');
    }
  }

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

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

  // 切换录音功能
  Future<void> toggleisRecord() async {
    isRecording.toggle();
    if (isRecording.value && isRecognizing.value) {
      // 使用可读性更好的时间格式
      final formattedTime =
          DateFormat('yyyyMMdd_HHmmss').format(DateTime.now());
      await _asrService.enableRecord(
          "${dir.path}/${currentModeTitle.value.tr}_$formattedTime.wav");
    } else if (!isRecording.value) {
      await _asrService.stopRecord(true);
    } else {}
  }

  // 开始语音识别
  Future<void> startRecognition() async {
    Logger.info('开始语音识别');
    // 等待权限请求完成并获取结果
    final bool granted = await _requestRecordPermission();

    // 如果权限被拒绝，直接返回
    if (!granted) {
      Logger.d("Permission", "录音权限被拒绝，无法开始录音");
      return;
    }

    if (isRecognizing.value) return;

    try {
      // 每次开始识别前检查 ASR 服务是否已配置为当前语言对
      final List<String> currentLanguages = [
        sourceLanguageCode.value,
        targetLanguageCode.value
      ];
      final bool needsReinit =
          !_asrService.supportedLanguages.toSet().containsAll(currentLanguages);

      if (needsReinit) {
        Logger.info('识别开始前发现语言变更，重新初始化ASR服务');
        await _reinitializeAsrService();
      }

      currentSessionId = DateTime.now().millisecondsSinceEpoch.toString();

      // // 初始化新的翻译项
      // final newItem = TranslationItem(
      //   sourceText: '',
      //   translatedText: '',
      //   sourceLanguageCode: sourceLanguageCode.value,
      //   targetLanguageCode: targetLanguageCode.value,
      //   timestamp: DateTime.now(),
      //   sessionId: currentSessionId!,
      //   isFirstInSession: true,
      //   isIntermediate: true,
      // );

      // // 添加到历史记录
      // translationHistory.add(newItem);
      // 开始连续语音识别
      if (currentMode.value == "audioVideo") {
        _bleManager.openDecoder();
        // 发送ble音乐或者通话远端声音
        _audioSourceType = true;
        isTtsEnabled.value = false; // 禁用TTS以避免干扰
        Logger.info('发送ble音乐或者通话远端声音');
      } else if (currentMode.value == "call") {
        // 发送ble系统mic和dac（音乐或者通话远端）声音
        _bleManager.openA2DPDecoder();
        _audioSourceType = true;
        isTtsEnabled.value = true;
        Logger.info('发送ble系统mic和dac（音乐或者通话远端）声音');
      } else {
        // 开始连续语音识别
        _audioSourceType = false;
        isTtsEnabled.value = true;
      }
      final recognitionStream =
          await _asrService.startContinuousRecognition(_audioSourceType);
      isRecognizing.value = true;
      if (isRecording.value && isRecognizing.value) {
        final formattedTime =
            DateFormat('yyyyMMdd_HHmmss').format(DateTime.now());
        await _asrService.enableRecord(
            "${dir.path}/${currentModeTitle.value.tr}_$formattedTime.wav");
      }
      // 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.toString()}');
    }
  }

  // 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 (translationHistory.isNotEmpty &&
          translationHistory.last.isIntermediate &&
          translationHistory.last.sourceText.isNotEmpty) {
        // 标记为最终结果
        translationHistory.last.isIntermediate = false;
        translationHistory.refresh();

        // 如果还没有翻译结果，尝试翻译
        if (translationHistory.last.translatedText.isEmpty) {
          await translateText(translationHistory.last.sourceText,
              translationHistory.last.timestamp,
              isFinal: true);
        }

        saveTranslationHistory();
      }

      currentSessionId = null;
    } catch (e) {
      Logger.error('停止语音识别失败: ${e.toString()}');
    }
  }

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

    if (translationHistory.isEmpty || !translationHistory.last.isIntermediate) {
      currentSessionId ??= DateTime.now().millisecondsSinceEpoch.toString();
      final newItem = TranslationItem(
        sourceText: text,
        translatedText: '',
        sourceLanguageCode: sourceLanguageCode.value,
        targetLanguageCode: targetLanguageCode.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: translationHistory.isEmpty ||
            translationHistory.last.sessionId != currentSessionId,
        isIntermediate: true,
      );

      translationHistory.add(newItem);
      // 添加新项后滚动到底部
      _scrollToBottom();
    } else {
      // 更新当前项
      translationHistory.last.sourceText = text;
      translationHistory.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 (translationHistory.isNotEmpty &&
          translationHistory.last.isIntermediate &&
          translationHistory.last.sourceText.isNotEmpty) {
        translateText(translationHistory.last.sourceText,
            translationHistory.last.timestamp,
            isFinal: false);
      }
    });
  }

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

    // 更新当前项
    if (translationHistory.last.isIntermediate) {
      translationHistory.last.sourceText = text;
      translationHistory.last.isIntermediate = false;
      translationHistory.refresh();
      // 更新后滚动到底部
      _scrollToBottom();
      saveTranslationHistory();

      // 使用项目的时间戳进行翻译
      translateText(text, translationHistory.last.timestamp, isFinal: true);
    } else {
      // 如果最后一项不是中间结果，创建新项
      final newItem = TranslationItem(
        sourceText: text,
        translatedText: '',
        sourceLanguageCode: sourceLanguageCode.value,
        targetLanguageCode: targetLanguageCode.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId ??
            DateTime.now().millisecondsSinceEpoch.toString(),
        isFirstInSession: translationHistory.isEmpty ||
            translationHistory.last.sessionId != currentSessionId,
        isIntermediate: false,
      );

      translationHistory.add(newItem);
      translationHistory.refresh();
      _scrollToBottom();
      saveTranslationHistory();

      // 使用新项目的时间戳进行翻译
      translateText(text, newItem.timestamp, isFinal: true);
    }
  }

  // 翻译文本
  Future<String?> translateText(String sourceText, DateTime timestamp,
      {bool isFinal = false}) 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) {
        // 查找匹配的项目 - 优先使用timestamp查找
        int index = -1;

        index = translationHistory
            .indexWhere((item) => item.timestamp.isAtSameMomentAs(timestamp));
        if (index != -1) {
          // 更新历史项
          translationHistory[index].translatedText = translationResult;
          translationHistory[index].sourceLanguageCode =
              detectedSourceLanguageCode;
          translationHistory[index].targetLanguageCode =
              detectedTargetLanguageCode;
          translationHistory.refresh();
          saveTranslationHistory();
          // 更新后滚动到底部
          _scrollToBottom();

          // 播放TTS - 只在最终结果时播放
          if (isTtsEnabled.value && isFinal) {
            // Logger.info('播放翻译文本: ${translationResult}');
            await playTranslatedText(translationResult);
          }
        } else {
          Logger.info(
              '未找到匹配的历史项 ${sourceText} ${timestamp.toIso8601String() ?? "无时间戳"}');
        }
      }
    } catch (e) {
      Logger.error('翻译失败: ${e.toString()}');
    } 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.speakOnce(text);
    } catch (e) {
      Logger.error('播放翻译失败: ${e.toString()}');
    }
  }

  // 停止所有操作
  Future<void> stopAll() async {
    try {
      if (currentMode.value == "audioVideo" || currentMode.value == "call") {
        _bleManager.closeCodec();
        // 发送ble音乐或者通话远端声音
        Logger.info('发送ble音乐或者通话远端声音');
      }
      if (isRecognizing.value) {
        await stopRecognition();
      }
      await _asrService.stopRecord(true);
      _translationDebounceTimer?.cancel();
      await _ttsService.stop();
    } catch (e) {
      Logger.error('停止操作失败: ${e.toString()}');
    }
  }

  // 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.speakOnce(item.translatedText);
    } catch (e) {
      Logger.error('播放翻译项失败: ${e.toString()}');
    }
  }

  // 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.speakOnce(text);
    } catch (e) {
      Logger.error('播放文本失败: ${e.toString()}');
    }
  }

  // 滚动到底部
  void _scrollToBottom() {
    if (scrollController.hasClients &&
        (translationHistory.isNotEmpty || currentSessionId != 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.toString()}');
      }
    }
  }

  // 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();

    // 更新ASR支持的语言并重新初始化
    _reinitializeAsrService();
  }

  // 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();

      // 更新ASR支持的语言并重新初始化
      _reinitializeAsrService();
    }
  }

  // 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();

      // 更新ASR支持的语言并重新初始化
      _reinitializeAsrService();
    }
  }

  // 重新初始化ASR服务以支持新的语言
  Future<void> _reinitializeAsrService() async {
    try {
      // 更新ASR支持的语言
      final List<String> asrSupportedLanguages = [
        sourceLanguageCode.value,
        targetLanguageCode.value
      ];

      Logger.info('重新初始化ASR服务，支持语言: $asrSupportedLanguages');

      // 重新初始化ASR服务
      await _asrService.initialize(
        supportedLanguages: asrSupportedLanguages,
      );

      Logger.info('ASR服务重新初始化成功');
    } catch (e) {
      Logger.error('重新初始化ASR服务失败: ${e.toString()}');
    }
  }

  // 加载翻译历史
  void loadTranslationHistory() {
    final historyJson = _storage.read(_historyKey);
    if (historyJson != null) {
      try {
        final List<dynamic> historyList = jsonDecode(historyJson);
        final List<TranslationItem> allHistory =
            historyList.map((item) => TranslationItem.fromJson(item)).toList();

        // 只保留最新的10条记录
        if (allHistory.length > _maxHistoryItems) {
          translationHistory.value =
              allHistory.sublist(allHistory.length - _maxHistoryItems);
        } else {
          translationHistory.value = allHistory;
        }

        // 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.toString()}');
      }
    }
  }

  // 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.toString()}');
    }
  }

  // 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();
  }

  /// 处理原生语音交互开始事件
  void _handleVoiceInteractionStarted() {
    // 收到recognitionStarted事件时，停止当前的AI交互、录音和TTS
    stopAll();
  }
}

// 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';
  }
}