import 'dart:async';
import 'package:get/get.dart';
import 'package:flutter/widgets.dart';
import '../models/message_model.dart';
import '../../../data/services/volcano_ai_service.dart';
import '../../../data/services/volcano_tts_api_service.dart';
import '../../../data/services/azure_asr_service.dart';
import '../../../data/providers/agent_provider.dart';
import '../../../data/models/agent.dart';
import '../../../core/utils/logger.dart';
import '../../../data/services/chat_history_service.dart';

class ChatController extends GetxController {
  // 服务
  final VolcanoAIService _aiService = Get.find<VolcanoAIService>();
  final VolcanoTtsApiService _ttsService = Get.find<VolcanoTtsApiService>();
  final AzureAsrService _asrService = Get.find<AzureAsrService>();
  final ChatHistoryService _historyService = Get.find<ChatHistoryService>();

  // 添加ScrollController用于控制列表滚动
  final ScrollController scrollController = ScrollController();

  // Agent 信息
  late final Agent agent;

  // 消息列表
  final RxList<Message> messages = <Message>[].obs;

  // 输入控制
  final RxString inputText = ''.obs;

  // 状态控制
  final RxBool isLoading = false.obs;
  final RxBool isSending = false.obs;
  final RxBool isTtsEnabled = true.obs;
  final RxBool isVoiceRecognitionActive = false.obs;

  // 语音识别状态
  final RxString recognizedText = ''.obs;
  final RxBool isListening = false.obs;

  // 临时消息ID，用于语音识别中的消息
  String? _tempRecognitionMessageId;

  // 流式响应控制
  StreamSubscription? _aiResponseSubscription;
  StreamSubscription? _recognitionSubscription;

  // 取消标志
  bool _shouldCancelAiResponse = false;

  @override
  void onInit() {
    super.onInit();

    // 从路由参数获取Agent信息
    final Map<String, dynamic> args = Get.arguments ?? {};
    final String agentId = args['agentId'] ?? 'personal_assistant';

    // 获取Agent
    final Agent? foundAgent = AgentProvider.getAgentById(agentId);
    if (foundAgent == null) {
      Logger.error('无法找到Agent: $agentId');
      Get.back();
      return;
    }

    agent = foundAgent;

    // 加载聊天历史
    _loadChatHistory();

    // 如果没有历史记录，添加欢迎消息
    if (messages.isEmpty && agent.welcomeMessage.isNotEmpty) {
      messages.add(Message(
        role: 'assistant',
        content: agent.welcomeMessage,
        timestamp: DateTime.now(),
      ));
          // 如果启用了TTS，播放欢迎消息
      if (isTtsEnabled.value) {
        _ttsService.speakSingle(agent.welcomeMessage);
      }
    }


    // 如果playVoiceOnEnter为true，自动激活语音识别
    if (args['playVoiceOnEnter'] == true) {
      // 延迟一段时间后激活语音识别，等待TTS播放完成
      startVoiceRecognition();
    }

    // 使用微任务在布局完成后自动滚动到底部
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _scrollToBottom();
    });
  }

  @override
  void onClose() {
    // 关闭ScrollController
    scrollController.dispose();

    // 取消所有订阅
    _aiResponseSubscription?.cancel();
    _recognitionSubscription?.cancel();

    // 停止TTS
    if (_ttsService.isPlaying) {
      _ttsService.stop();
    }

    // 停止语音识别
    if (isVoiceRecognitionActive.value) {
      _asrService.stopContinuousRecognition();
    }

    super.onClose();
  }

  /// 滚动到列表底部方法
  void _scrollToBottom() {
    if (scrollController.hasClients && messages.isNotEmpty) {
      try {
        scrollController.animateTo(
          scrollController.position.maxScrollExtent,
          duration: Duration(milliseconds: 300),
          curve: Curves.easeOut,
        );
      } catch (e) {
        Logger.error('滚动到底部失败', e);
      }
    }
  }

  // 发送消息
  Future<void> sendMessage(String text) async {
    if (text.trim().isEmpty) return;

    // 停止TTS
    if (_ttsService.isPlaying) {
      _ttsService.stop();
    }

    // 添加用户消息
    final userMessage = Message(
      role: 'user',
      content: text,
      timestamp: DateTime.now(),
    );
    messages.add(userMessage);

    // 滚动到底部显示用户消息
    Future.delayed(Duration(milliseconds: 100), _scrollToBottom);

    // 清空输入框
    inputText.value = '';

    // 添加加载中的消息
    final loadingMessage = Message.loading();
    messages.add(loadingMessage);

    // 再次滚动到底部显示加载中的消息
    Future.delayed(Duration(milliseconds: 100), _scrollToBottom);

    isSending.value = true;

    try {
      // 构建消息历史
      final List<Map<String, String>> messageHistory = [];

      // 只取最近的10条消息作为上下文
      final recentMessages = messages.where((m) => !m.isLoading).toList();
      final startIndex =
          recentMessages.length > 10 ? recentMessages.length - 10 : 0;

      for (int i = startIndex; i < recentMessages.length; i++) {
        final m = recentMessages[i];
        messageHistory.add({
          'role': m.role,
          'content': m.content,
        });
      }

      // 重置取消标志
      _shouldCancelAiResponse = false;

      // 准备TTS会话
      if (isTtsEnabled.value) {
        await _ttsService.startSession(agent.voice);
      }

      String fullResponse = '';

      // 获取AI响应流
      final responseStream = _aiService.sendMessageStream(
        messages: messageHistory,
        systemPrompt: agent.systemPrompt,
      );

      // 订阅响应流
      _aiResponseSubscription = responseStream.listen(
        (chunk) {
          if (_shouldCancelAiResponse) return;

          fullResponse += chunk;

          // 更新加载中的消息内容，但保持isLoading状态
          final index = messages.indexWhere((m) => m.isLoading);
          if (index != -1) {
            // 直接更新消息内容，然后使用refresh()触发UI更新
            messages[index] = messages[index].copyWith(
              content: fullResponse,
              isLoading: true, // 明确设置为true以确保状态一致
            );

            // 使用refresh()方法刷新列表，触发UI更新
            messages.refresh();

            // 每次收到新内容后滚动到底部
            Future.delayed(Duration(milliseconds: 100), _scrollToBottom);
          }

          // 如果TTS启用，发送到TTS
          if (isTtsEnabled.value && !_shouldCancelAiResponse) {
            // 直接将文本块发送到TTS，服务会自己处理断句
            _ttsService.speak(chunk);
          }
        },
        onDone: () {
          if (_shouldCancelAiResponse) return;

          // 完成响应，此时才将isLoading设为false
          final index = messages.indexWhere((m) => m.isLoading);
          if (index != -1) {
            messages[index] = messages[index].copyWith(
              content: fullResponse,
              isLoading: false,
            );

            // 滚动到底部显示完整回复
            Future.delayed(Duration(milliseconds: 100), _scrollToBottom);
          }

          // 结束TTS会话
          if (isTtsEnabled.value) {
            _ttsService.endSession();
          }

          isSending.value = false;

          // 保存聊天历史
          _saveChatHistory();
        },
        onError: (error) {
          Logger.error('AI响应错误', error);

          // 更新加载中的消息为错误消息
          final index = messages.indexWhere((m) => m.isLoading);
          if (index != -1) {
            messages[index] = messages[index].copyWith(
              content: '抱歉，我遇到了一些问题，无法回应您的请求。',
              isLoading: false,
            );
          }

          // 结束TTS会话
          if (isTtsEnabled.value) {
            _ttsService.endSession();
          }

          isSending.value = false;
        },
      );
    } catch (e) {
      Logger.error('发送消息失败', e);

      // 更新加载中的消息为错误消息
      final index = messages.indexWhere((m) => m.isLoading);
      if (index != -1) {
        messages[index] = messages[index].copyWith(
          content: '抱歉，我遇到了一些问题，无法回应您的请求。',
          isLoading: false,
        );
      }

      isSending.value = false;
    }
  }

  // 切换TTS状态
  void toggleTts() {
    isTtsEnabled.toggle();

    // 如果关闭TTS，停止当前播放
    if (!isTtsEnabled.value && _ttsService.isPlaying) {
      _ttsService.stop();
    }
  }

  // 开始语音识别
  Future<void> startVoiceRecognition() async {


    if (isVoiceRecognitionActive.value) return;

    // 每次收到新内容后滚动到底部
    Future.delayed(Duration(milliseconds: 100), _scrollToBottom);
    // 停止TTS
    if (_ttsService.isPlaying) {
      _ttsService.stop();

      // 如果正在接收AI响应，取消它
      if (isSending.value) {
        _shouldCancelAiResponse = true;
        _aiResponseSubscription?.cancel();

        // 移除加载中的消息
        messages.removeWhere((m) => m.isLoading);
        isSending.value = false;
      }
    }

    try {
      // 启动语音识别
      final success = await _asrService.startContinuousRecognition();

      if (success) {
        isVoiceRecognitionActive.value = true;
        isListening.value = true;
        recognizedText.value = '';

        // 不再添加"正在聆听..."的临时消息

        // 监听识别事件
        _recognitionSubscription = _asrService.recognitionStream?.listen(
          (event) {
            switch (event.type) {
              case RecognitionEventType.recognizing:
                // 实时更新识别文本
                if (event.text.isNotEmpty) {
                  recognizedText.value = event.text;

                  // 检查是否已经有临时消息
                  final tempMessageIndex = messages.indexWhere((m) =>
                      m.role == 'user' &&
                      m.timestamp.millisecondsSinceEpoch >
                          DateTime.now().millisecondsSinceEpoch - 5000);

                  if (tempMessageIndex >= 0) {
                    // 更新已有的临时消息
                    messages[tempMessageIndex] =
                        messages[tempMessageIndex].copyWith(
                      content: event.text,
                    );
                    // 每次收到新内容后滚动到底部
                    Future.delayed(
                        Duration(milliseconds: 100), _scrollToBottom);
                    // 使用refresh()方法刷新列表
                    messages.refresh();
                  } else {
                    // 添加新的临时消息，但只有在有实际内容时
                    final tempMessage = Message(
                      role: 'user',
                      content: event.text,
                      timestamp: DateTime.now(),
                    );
                    messages.add(tempMessage);
                  }
                }
                break;
              case RecognitionEventType.finalResult:
                // 最终结果
                if (event.text.isNotEmpty) {
                  recognizedText.value = event.text;

                  // 查找并移除临时消息
                  final tempMessageIndex = messages.indexWhere((m) =>
                      m.role == 'user' &&
                      m.timestamp.millisecondsSinceEpoch >
                          DateTime.now().millisecondsSinceEpoch - 5000);

                  if (tempMessageIndex >= 0) {
                    messages.removeAt(tempMessageIndex);
                  }

                  // 发送识别到的文本
                  sendMessage(event.text);

                  // 重置识别文本
                  recognizedText.value = '';
                }
                break;
              case RecognitionEventType.sessionStopped:
              case RecognitionEventType.canceled:
                // 会话结束
                isVoiceRecognitionActive.value = false;
                isListening.value = false;

                // 查找并移除临时消息
                final tempMessageIndex = messages.indexWhere((m) =>
                    m.role == 'user' &&
                    m.timestamp.millisecondsSinceEpoch >
                        DateTime.now().millisecondsSinceEpoch - 5000);

                if (tempMessageIndex >= 0 &&
                    messages[tempMessageIndex].content.trim().isEmpty) {
                  messages.removeAt(tempMessageIndex);
                }
                break;
              default:
                break;
            }
          },
          onError: (error) {
            Logger.error('语音识别错误', error);
            isVoiceRecognitionActive.value = false;
            isListening.value = false;

            // 查找并移除临时消息
            final tempMessageIndex = messages.indexWhere((m) =>
                m.role == 'user' &&
                m.timestamp.millisecondsSinceEpoch >
                    DateTime.now().millisecondsSinceEpoch - 5000);

            if (tempMessageIndex >= 0 &&
                messages[tempMessageIndex].content.trim().isEmpty) {
              messages.removeAt(tempMessageIndex);
            }
          },
        );
      } else {
        Logger.error('启动语音识别失败');
      }
    } catch (e) {
      Logger.error('启动语音识别失败', e);
      isVoiceRecognitionActive.value = false;
      isListening.value = false;
    }
  }

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

    try {
      await _asrService.stopContinuousRecognition();
      _recognitionSubscription?.cancel();
      _recognitionSubscription = null;

      isVoiceRecognitionActive.value = false;
      isListening.value = false;
      recognizedText.value = '';

      // 查找并移除临时消息
      final tempMessageIndex = messages.indexWhere((m) =>
          m.role == 'user' &&
          m.timestamp.millisecondsSinceEpoch >
              DateTime.now().millisecondsSinceEpoch - 5000);

      if (tempMessageIndex >= 0 &&
          messages[tempMessageIndex].content.trim().isEmpty) {
        messages.removeAt(tempMessageIndex);
      }
    } catch (e) {
      Logger.error('停止语音识别失败', e);
    }
  }

  // 清空聊天记录
  void clearChat() {
    messages.clear();

    // 添加欢迎消息
    if (agent.welcomeMessage.isNotEmpty) {
      messages.add(Message(
        role: 'assistant',
        content: agent.welcomeMessage,
        timestamp: DateTime.now(),
      ));
    }

    // 删除存储的历史记录
    _historyService.clearHistory(agent.id);
  }

  // 加载聊天历史
  void _loadChatHistory() {
    final history = _historyService.loadHistory(agent.id);
    if (history.isNotEmpty) {
      messages.clear();
      messages.addAll(history);
    }
  }

  // 保存聊天历史
  void _saveChatHistory() {
    _historyService.saveHistory(agent.id, messages);
  }

  // 添加消息，供外部调用
  void addMessage(Message message) {
    messages.add(message);
    _saveChatHistory();

    // 滚动到底部显示新添加的消息
    Future.delayed(Duration(milliseconds: 100), _scrollToBottom);
  }
}