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/azure_asr_service.dart';
import '../../../data/services/volcano_translation_service.dart';
import '../../../data/services/volcano_tts_api_service.dart';
// import '../../../core/utils/logger.dart';

class TranslationController extends GetxController {
  // Services
  final AzureAsrService _asrService = Get.find<AzureAsrService>();
  final VolcanoTranslationService _translationService = Get.find<VolcanoTranslationService>();
  final VolcanoTtsApiService _ttsService = Get.find<VolcanoTtsApiService>();
  final GetStorage _storage = GetStorage();

  // Storage key
  static const String _historyKey = 'translation_history';
  static const int _maxHistoryItems = 100; // 最多保存100条历史记录

  // State variables
  final isRecognizing = false.obs;
  final isTranslating = false.obs;
  final isTtsEnabled = true.obs;
  final recognizedText = ''.obs;
  final translatedText = ''.obs;
  final sourceLanguage = '中文 (Chinese)'.obs;
  final targetLanguage = '英语 (English)'.obs;
  final translationHistory = <TranslationItem>[].obs;
  
  // 支持的语言列表 - 改为Map结构，键为显示名称，值为语言代码
  final Map<String, String> supportedLanguages = {
    '中文 (Chinese)': 'zh',
    '英语 (English)': 'en',
    '日语 (Japanese)': 'ja',
    '韩语 (Korean)': 'ko',
    '法语 (French)': 'fr',
    '德语 (German)': 'de',
    '西班牙语 (Spanish)': 'es',
    '意大利语 (Italian)': 'it',
    '俄语 (Russian)': 'ru',
    '泰语 (Thai)': 'th',
    '葡萄牙语 (Portuguese)': 'pt',
    '阿拉伯语 (Arabic)': 'ar',
    '越南语 (Vietnamese)': 'vi',
    '印尼语 (Indonesian)': 'id',
    '印地语 (Hindi)': 'hi',
    '土耳其语 (Turkish)': 'tr',
    '波兰语 (Polish)': 'pl',
    '荷兰语 (Dutch)': 'nl',
    '瑞典语 (Swedish)': 'sv',
    '捷克语 (Czech)': 'cs',
    '希腊语 (Greek)': 'el',
    '罗马尼亚语 (Romanian)': 'ro',
    '匈牙利语 (Hungarian)': 'hu',
    '乌克兰语 (Ukrainian)': 'uk',
    '保加利亚语 (Bulgarian)': 'bg',
    '丹麦语 (Danish)': 'da',
    '芬兰语 (Finnish)': 'fi',
    '挪威语 (Norwegian)': 'no',
    '马来语 (Malay)': 'ms',
  };
  
  // Current translation item
  TranslationItem? currentItem;
  
  // Subscription for recognition stream
  StreamSubscription? _recognitionSubscription;
  
  // Scroll controller for ListView
  final ScrollController scrollController = ScrollController();
  
  // Timer for debouncing translation requests
  Timer? _translationDebounceTimer;

  // 当前会话ID
  String? currentSessionId;

  @override
  void onInit() {
    super.onInit();
    
    // 加载历史记录
    loadTranslationHistory();
    
    // Initialize the translation service
    _initTranslationService();
    
    // 添加后处理，确保在历史记录加载后滚动到底部
    WidgetsBinding.instance.addPostFrameCallback((_) {
      // 延迟执行滚动操作，确保视图已完全渲染
      Future.delayed(const Duration(milliseconds: 300), () {
        _scrollToBottom();
      });
    });
    
    // Start voice recognition automatically when the page is loaded
    startRecognition();
  }

  @override
  void onClose() {
    stopRecognition();
    _recognitionSubscription?.cancel();
    _translationDebounceTimer?.cancel();
    scrollController.dispose();
    super.onClose();
  }
  
  // Initialize the translation service
  Future<void> _initTranslationService() async {
    try {
      await _translationService.initialize();
    } catch (e) {
      Get.snackbar(
        'Error',
        'Failed to initialize translation service: ${e.toString()}',
        snackPosition: SnackPosition.BOTTOM,
      );
    }
  }

  // Toggle TTS feature
  void toggleTts() {
    isTtsEnabled.toggle();
  }

  // Start voice recognition
  Future<void> startRecognition() async {
    if (isRecognizing.value) return;
    
    try {
      // 生成新的会话ID
      currentSessionId = DateTime.now().millisecondsSinceEpoch.toString();
      
      // Initialize a new translation item
      currentItem = TranslationItem(
        sourceText: '',
        translatedText: '',
        sourceLanguage: sourceLanguage.value,
        targetLanguage: targetLanguage.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: true, // 标记为会话中的第一条
      );
      
      // Start the voice recognition service
      final success = await _asrService.startContinuousRecognition();
      
      if (success) {
        isRecognizing.value = true;
        
        // Reset the recognized text
        recognizedText.value = '';
        translatedText.value = '';
        
        // Listen for recognition events
        _recognitionSubscription = _asrService.recognitionStream?.listen((event) {
          switch (event.type) {
            case RecognitionEventType.finalResult:
              if (event.text.isNotEmpty) {
                handleFinalResult(event.text);
              }
              break;
            case RecognitionEventType.recognizing:
              // Update the UI with intermediate results
              if (event.text.isNotEmpty) {
                handleIntermediateResult(event.text);
              }
              break;
            case RecognitionEventType.error:
              Get.snackbar(
                'Error',
                'Recognition error: ${event.error}',
                snackPosition: SnackPosition.BOTTOM,
              );
              break;
            default:
              break;
          }
        });
      } else {
        throw Exception('Failed to start continuous recognition');
      }
    } catch (e) {
      isRecognizing.value = false;
      Get.snackbar(
        'Error',
        'Failed to start voice recognition: ${e.toString()}',
        snackPosition: SnackPosition.BOTTOM,
      );
    }
  }

  // Stop voice recognition
  Future<void> stopRecognition() async {
    if (!isRecognizing.value) return;
    
    try {
      await _asrService.stopContinuousRecognition();
      _recognitionSubscription?.cancel();
      _recognitionSubscription = null;
      isRecognizing.value = false;
      
      // 添加当前项到历史（如果有内容）
      finalizeCurrentItem();
      
      // 重置当前会话ID
      currentSessionId = null;
      
      // 重置当前显示的文本
      recognizedText.value = '';
      translatedText.value = '';
    } catch (e) {
      Get.snackbar(
        'Error',
        'Failed to stop voice recognition: ${e.toString()}',
        snackPosition: SnackPosition.BOTTOM,
      );
    }
  }
  
  // Handle intermediate recognition result
  void handleIntermediateResult(String text) {
    if (text.isEmpty) return;
    
    // 如果当前没有活跃的翻译项，创建一个新的
    if (currentItem == null) {
      // 如果没有当前会话ID，创建一个新的
      if (currentSessionId == null) {
        currentSessionId = DateTime.now().millisecondsSinceEpoch.toString();
      }
      
      currentItem = TranslationItem(
        sourceText: text,
        translatedText: '',
        sourceLanguage: sourceLanguage.value,
        targetLanguage: targetLanguage.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: translationHistory.isEmpty || 
            translationHistory.last.sessionId != currentSessionId,
      );
    } else {
      // 更新当前翻译项
      currentItem!.sourceText = text;
    }
    
    // 实时更新识别文本
    recognizedText.value = text;
    
    // Debounce translation requests to avoid too many API calls
    _translationDebounceTimer?.cancel();
    _translationDebounceTimer = Timer(const Duration(milliseconds: 300), () {
      translateText(text, isFinal: false);
    });
    
    // Scroll to the bottom to show the latest content
    _scrollToBottom();
  }
  
  // Handle final recognition result
  void handleFinalResult(String text) {
    if (text.isEmpty) return;
    
    // 更新当前翻译项（如果不存在则创建一个）
    if (currentItem == null) {
      // 如果没有当前会话ID，创建一个新的
      if (currentSessionId == null) {
        currentSessionId = DateTime.now().millisecondsSinceEpoch.toString();
      }
      
      currentItem = TranslationItem(
        sourceText: text,
        translatedText: '',
        sourceLanguage: sourceLanguage.value,
        targetLanguage: targetLanguage.value,
        timestamp: DateTime.now(),
        sessionId: currentSessionId!,
        isFirstInSession: translationHistory.isEmpty || 
            translationHistory.last.sessionId != currentSessionId,
      );
    } else {
      currentItem!.sourceText = text;
    }
    
    // 更新识别文本
    recognizedText.value = text;
    
    // 翻译最终结果 (添加到历史的逻辑已移至translateText方法)
    translateText(text, isFinal: true).then((_) {
      // 作为安全措施，确保当前项被添加到历史中
      // 这是为了处理translateText中可能因为条件不满足而没有添加到历史的情况
      finalizeCurrentItem();
    });
    
    // Scroll to the bottom to show the latest content
    _scrollToBottom();
  }
  
  // Finalize the current translation item and add it to history
  void finalizeCurrentItem() {
    if (currentItem != null && 
        currentItem!.sourceText.isNotEmpty && 
        currentItem!.translatedText.isNotEmpty &&
        !translationHistory.contains(currentItem)) {
      translationHistory.add(currentItem!);
      saveTranslationHistory();
      currentItem = null;
    }
  }

  // Handle voice recognition result (legacy method, kept for compatibility)
  void handleVoiceResult(String text) {
    handleFinalResult(text);
  }

  // Translate the recognized text
  Future<void> translateText(String text, {bool isFinal = true}) async {
    if (text.isEmpty) return;
    
    isTranslating.value = true;
    
    // 保存当前的翻译项引用，确保异步返回时更新正确的项
    final TranslationItem? itemToUpdate = currentItem;
    
    try {
      // 获取源语言和目标语言的代码
      final String sourceCode = supportedLanguages[sourceLanguage.value] ?? 'zh';
      
      // 尝试检测输入文本的语言（这里简化处理，实际项目可能需要更复杂的语言检测）
      bool shouldSwapLanguages = false;
      
      // 简单的语言检测逻辑 - 检查是否包含中文字符
      final bool containsChinese = RegExp(r'[\u4e00-\u9fa5]').hasMatch(text);
      final bool containsLatin = RegExp(r'[a-zA-Z]').hasMatch(text);
      
      // 如果源语言是中文但文本不包含中文字符，且包含拉丁字符，可能需要交换语言
      if (sourceCode == 'zh' && !containsChinese && containsLatin) {
        shouldSwapLanguages = true;
      }
      // 如果源语言不是中文但文本包含中文字符，可能需要交换语言
      else if (sourceCode != 'zh' && containsChinese) {
        shouldSwapLanguages = true;
      }
      
      // 调用翻译服务
      final result = await _translationService.translateText(
        text: text,
        sourceLanguage: shouldSwapLanguages ? targetLanguage.value : sourceLanguage.value,
        targetLanguage: shouldSwapLanguages ? sourceLanguage.value : targetLanguage.value,
      );
      
      if (result != null) {
        // 实时更新翻译文本
        translatedText.value = result;
        
        // 确保更新的是发起翻译请求时的翻译项，而不是当前可能已经变化的翻译项
        if (itemToUpdate != null && itemToUpdate.sourceText == text) {
          itemToUpdate.translatedText = result;
          
          // 如果是最终结果，并且当前项仍然是发起请求时的项，则添加到历史
          if (isFinal && itemToUpdate == currentItem) {
            // 检查是否已经存在相同会话ID的项
            bool isFirstInSession = true;
            for (var item in translationHistory) {
              if (item.sessionId == itemToUpdate.sessionId) {
                isFirstInSession = false;
                break;
              }
            }
            
            // 创建一个新的TranslationItem，包含正确的isFirstInSession值
            final updatedItem = TranslationItem(
              sourceText: itemToUpdate.sourceText,
              translatedText: itemToUpdate.translatedText,
              sourceLanguage: itemToUpdate.sourceLanguage,
              targetLanguage: itemToUpdate.targetLanguage,
              timestamp: itemToUpdate.timestamp,
              sessionId: itemToUpdate.sessionId,
              isFirstInSession: isFirstInSession,
            );
            
            translationHistory.add(updatedItem);
            saveTranslationHistory();
            currentItem = null;  // 重要：将当前项设为null，表示已完成
            
            // 重置当前显示的文本，避免与历史项重复
            recognizedText.value = '';
            translatedText.value = '';
          }
          
          // Play TTS if enabled and this is a final result
          if (isTtsEnabled.value && isFinal) {
            playTranslatedText(result);
          }
        }
      }
    } catch (e) {
      Get.snackbar(
        'Error',
        'Translation failed: ${e.toString()}',
        snackPosition: SnackPosition.BOTTOM,
      );
    } finally {
      isTranslating.value = false;
    }
  }

  // Play the translated text using TTS
  Future<void> playTranslatedText(String text) async {
    if (text.isEmpty) return;
    
    try {
      await _ttsService.speakSingle(text);
    } catch (e) {
      Get.snackbar(
        'Error',
        'Failed to play translation: ${e.toString()}',
        snackPosition: SnackPosition.BOTTOM,
      );
    }
  }

  // Play a specific translation item
  Future<void> playTranslationItem(TranslationItem item) async {
    await playTranslatedText(item.translatedText);
  }
  
  // Scroll to the bottom of the list
  void _scrollToBottom() {
    if (scrollController.hasClients) {
      try {
        scrollController.animateTo(
          scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 300),
          curve: Curves.easeOut,
        );
      } catch (e) {
        // 如果滚动失败，尝试延迟后再次滚动
        Future.delayed(const Duration(milliseconds: 200), () {
          if (scrollController.hasClients) {
            scrollController.jumpTo(scrollController.position.maxScrollExtent);
          }
        });
      }
    } else {
      // 如果scrollController还没有客户端，延迟后再尝试
      Future.delayed(const Duration(milliseconds: 200), _scrollToBottom);
    }
  }

  // 切换源语言和目标语言
  void swapLanguages() {
    final temp = sourceLanguage.value;
    sourceLanguage.value = targetLanguage.value;
    targetLanguage.value = temp;
    
    // 如果正在识别，需要停止并重新开始
    if (isRecognizing.value) {
      stopRecognition();
      startRecognition();
    }
  }
  
  // 设置源语言
  void setSourceLanguage(String language) {
    if (sourceLanguage.value != language) {
      sourceLanguage.value = language;
      
      // 如果正在识别，需要停止并重新开始
      if (isRecognizing.value) {
        stopRecognition();
        startRecognition();
      }
    }
  }
  
  // 设置目标语言
  void setTargetLanguage(String language) {
    if (targetLanguage.value != language) {
      targetLanguage.value = language;
    }
  }

  // Load translation history from storage
  void loadTranslationHistory() {
    final historyJson = _storage.read(_historyKey);
    if (historyJson != null) {
      final List<dynamic> historyList = jsonDecode(historyJson);
      translationHistory.value = historyList.map((item) => TranslationItem.fromJson(item)).toList();
      
      // 确保在历史记录加载后滚动到底部
      WidgetsBinding.instance.addPostFrameCallback((_) {
        _scrollToBottom();
      });
    }
  }

  // Save translation history to storage
  void saveTranslationHistory() {
    // 限制历史记录数量，保留最新的记录
    if (translationHistory.length > _maxHistoryItems) {
      translationHistory.removeRange(0, translationHistory.length - _maxHistoryItems);
    }
    
    final List<Map<String, dynamic>> historyJson = 
        translationHistory.map((item) => item.toJson()).toList();
    _storage.write(_historyKey, jsonEncode(historyJson));
  }

  // Clear translation history
  void clearTranslationHistory() {
    translationHistory.clear();
    _storage.remove(_historyKey);
  }
}

// Model class for translation items
class TranslationItem {
  String sourceText;
  String translatedText;
  final String sourceLanguage;
  final String targetLanguage;
  final DateTime timestamp;
  final String sessionId;
  final bool isFirstInSession;

  TranslationItem({
    required this.sourceText,
    required this.translatedText,
    required this.sourceLanguage,
    required this.targetLanguage,
    required this.timestamp,
    required this.sessionId,
    this.isFirstInSession = false,
  });

  factory TranslationItem.fromJson(Map<String, dynamic> json) {
    return TranslationItem(
      sourceText: json['sourceText'],
      translatedText: json['translatedText'],
      sourceLanguage: json['sourceLanguage'],
      targetLanguage: json['targetLanguage'],
      timestamp: DateTime.parse(json['timestamp']),
      sessionId: json['sessionId'] ?? DateTime.now().millisecondsSinceEpoch.toString(),
      isFirstInSession: json['isFirstInSession'] ?? false,
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'sourceText': sourceText,
      'translatedText': translatedText,
      'sourceLanguage': sourceLanguage,
      'targetLanguage': targetLanguage,
      'timestamp': timestamp.toIso8601String(),
      'sessionId': sessionId,
      'isFirstInSession': isFirstInSession,
    };
  }
}