import 'dart:io';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';
import 'package:im_flutter_sdk/im_flutter_sdk.dart';
import 'package:video_thumbnail/video_thumbnail.dart';
import 'package:path_provider/path_provider.dart';
import '../controller/message/conversation_controller.dart';
import '../controller/message/chat_controller.dart';

// 完整的IM管理器实现，使用实际的SDK类型和方法
class IMManager {
  // 单例模式
  static final IMManager _instance = IMManager._internal();
  factory IMManager() => _instance;
  final storage = GetStorage();
  // 静态getter用于instance访问
  static IMManager get instance => _instance;

  bool _isInitialized = false;

  // 存储活跃的 ChatController 实例，key 为 userId
  final Map<String, ChatController> _activeChatControllers = {};

  IMManager._internal() {
    print('IMManager instance created');
  }

  /// 初始化IM SDK
  Future<bool> initialize(String appKey) async {
    try {
      if (_isInitialized) {
        print('IM SDK already initialized');
        return true;
      }

      // 创建EMOptions实例
      final options = EMOptions(
        appKey: appKey,
        autoLogin: false,
        acceptInvitationAlways: false,
      );

      // 初始化SDK
      await EMClient.getInstance.init(options);

      _isInitialized = true;
      print('IM SDK initialized successfully');
      return true;
    } catch (e) {
      print('Failed to initialize IM SDK: $e');
      return false;
    }
  }

  // 注册监听器
  void _registerListeners() {
    try {
      // 消息监听器

      // 连接监听器
      EMClient.getInstance.addConnectionEventHandler(
        '',
        EMConnectionEventHandler(
          onConnected: () {
            print('Connected to IM server');
          },
          onDisconnected: () {
            print('Disconnected from IM server:');
          },
          onTokenDidExpire: () {
            print('IM token about to expire');
          },
          onUserKickedByOtherDevice: () {
            print('User kicked out of IM server');
          },
        ),
      );
      EMClient.getInstance.chatManager.addEventHandler(
        // EMChatEventHandler 对应的 key。
        "",
        EMChatEventHandler(
          onMessagesReceived: (messages) {
            // 收到新消息时，更新会话列表
            _refreshConversationList();

            // 通知对应的 ChatController 更新消息列表
            _notifyChatControllers(messages);

            for (var msg in messages) {
              switch (msg.body.type) {
                case MessageType.TXT:
                  {}
                  break;
                case MessageType.IMAGE:
                  {}
                  break;
                case MessageType.VIDEO:
                  {}
                  break;
                case MessageType.LOCATION:
                  {}
                  break;
                case MessageType.VOICE:
                  {}
                  break;
                case MessageType.FILE:
                  {}
                  break;
                case MessageType.CUSTOM:
                  {}
                  break;
                case MessageType.COMBINE:
                  {}
                  break;
                case MessageType.CMD:
                  {
                    // 当前回调中不会有 CMD 类型消息，CMD 类型消息通过 `EMChatEventHandler#onCmdMessagesReceived` 回调接收
                  }
                  break;
              }
            }
          },
        ),
      );
    } catch (e) {
      print('Failed to register listeners: $e');
    }
  }

  /// 登录IM服务
  Future<bool> login(String token) async {
    try {
      if (!_isInitialized) {
        print('IM SDK not initialized');
        return false;
      }
      var userId = storage.read('userId');
      await EMClient.getInstance.logout();
      await EMClient.getInstance.loginWithToken(userId, token);
      // 注册监听器
      _registerListeners();
      print('IM login successful');
      return true;
    } catch (e) {
      print('IM login failed: $e');
      return false;
    }
  }

  /// 登出IM服务
  Future<bool> logout() async {
    try {
      await EMClient.getInstance.logout();
      print('IM logout successful');
      return true;
    } catch (e) {
      print('IM logout failed: $e');
      return false;
    }
  }

  /// 发送文本消息
  Future<EMMessage?> sendTextMessage(
    String content,
    String toChatUsername,
  ) async {
    print('Text message sent');
    try {
      // 创建文本消息
      final message = EMMessage.createTxtSendMessage(
        targetId: toChatUsername,
        content: content,
      );

      print('Text message sent successfully');
      return await EMClient.getInstance.chatManager.sendMessage(message);
    } catch (e) {
      print('Failed to send text message: $e');
      return null;
    }
  }

  /// 发送语音消息
  Future<EMMessage?> sendVoiceMessage(
    String filePath,
    String toChatUsername,
    int duration,
  ) async {
    try {
      // 创建图片消息
      final message = EMMessage.createVoiceSendMessage(
        targetId: toChatUsername,
        filePath: filePath,
        duration: duration,
      );

      // 发送消息
      await EMClient.getInstance.chatManager.sendMessage(message);
      print('Image message sent successfully');
      return message;
    } catch (e) {
      print('Failed to send image message: $e');
      return null;
    }
  }

  /// 发送图片消息
  Future<EMMessage?> sendImageMessage(
    String imagePath,
    String toChatUsername,
  ) async {
    try {
      // 创建图片消息
      final message = EMMessage.createImageSendMessage(
        targetId: toChatUsername,
        filePath: imagePath,
        sendOriginalImage: false,
      );

      // 发送消息
      await EMClient.getInstance.chatManager.sendMessage(message);
      print('Image message sent successfully');
      return message;
    } catch (e) {
      print('Failed to send image message: $e');
      return null;
    }
  }

  /// 发送视频消息
  Future<EMMessage?> sendVideoMessage(
    String videoPath,
    String toChatUsername,
    int duration,
  ) async {
    try {
      print('🎬 [IMManager] 创建视频消息');
      print('视频路径: $videoPath');
      print('接收用户: $toChatUsername');
      print('视频时长: $duration 秒');

      // 🎯 手动生成视频缩略图
      String? thumbnailPath;
      try {
        print('📸 [IMManager] 开始生成视频缩略图...');
        
        // 获取临时目录
        final tempDir = await getTemporaryDirectory();
        final fileName = videoPath.split('/').last.split('.').first;
        final thumbFileName = '${fileName}_thumb.jpg';
        thumbnailPath = '${tempDir.path}/$thumbFileName';
        
        // 使用 video_thumbnail 生成缩略图
        final uint8list = await VideoThumbnail.thumbnailFile(
          video: videoPath,
          thumbnailPath: thumbnailPath,
          imageFormat: ImageFormat.JPEG,
          maxWidth: 400, // 缩略图最大宽度
          quality: 75,   // 图片质量
        );
        
        if (uint8list != null && File(uint8list).existsSync()) {
          thumbnailPath = uint8list;
          print('✅ [IMManager] 缩略图生成成功: $thumbnailPath');
        } else {
          print('⚠️ [IMManager] 缩略图生成返回null');
          thumbnailPath = null;
        }
      } catch (e) {
        print('❌ [IMManager] 生成缩略图失败: $e');
        thumbnailPath = null;
      }

      // 创建视频消息
      final message = EMMessage.createVideoSendMessage(
        targetId: toChatUsername,
        filePath: videoPath,
        duration: duration,
        thumbnailLocalPath: thumbnailPath, // 🎯 指定缩略图路径
      );

      print('消息创建成功，消息类型: ${message.body.type}');
      print('消息体是否为视频: ${message.body is EMVideoMessageBody}');
      
      // 检查缩略图信息
      if (message.body is EMVideoMessageBody) {
        final videoBody = message.body as EMVideoMessageBody;
        print('📸 [IMManager] 缩略图本地路径: ${videoBody.thumbnailLocalPath}');
        print('📸 [IMManager] 缩略图远程路径: ${videoBody.thumbnailRemotePath}');
        
        // 验证缩略图文件是否存在
        if (videoBody.thumbnailLocalPath != null) {
          final thumbFile = File(videoBody.thumbnailLocalPath!);
          print('📸 [IMManager] 缩略图文件是否存在: ${thumbFile.existsSync()}');
        }
      }

      // 发送消息
      await EMClient.getInstance.chatManager.sendMessage(message);
      print('✅ [IMManager] 视频消息发送成功');
      return message;
    } catch (e) {
      print('❌ [IMManager] 发送视频消息失败: $e');
      return null;
    }
  }

  /// 获取会话列表
  Future<List<EMConversation>> getConversations() async {
    return EMClient.getInstance.chatManager.loadAllConversations();
  }

  /// 获取好有列表
  Future<Map<String, EMUserInfo>> getContacts(String userId) async {
    return await EMClient.getInstance.userInfoManager.fetchUserInfoById([
      userId,
    ]);
  }

  /// 获取指定会话的消息记录
  Future<List<EMMessage?>> getMessages(
    String conversationId, {
    int pageSize = 20,
    String? startMsgId,
  }) async {
    EMConversationType convType = EMConversationType.Chat;
    EMCursorResult<EMMessage?> cursor = await EMClient.getInstance.chatManager
        .fetchHistoryMessagesByOption(
          conversationId,
          convType,
          pageSize: pageSize,
        );
    return cursor.data;
  }

  /// 获取用户信息
  Future<EMUserInfo?> getUserInfo(String userId) async {
    var data = await EMClient.getInstance.userInfoManager.fetchUserInfoById([
      userId,
    ]);
    return data[userId];
  }

  /// 注册 ChatController
  void registerChatController(ChatController controller) {
    _activeChatControllers[controller.userId] = controller;
    if (Get.isLogEnable) {
      Get.log('注册 ChatController: ${controller.userId}');
    }
  }

  /// 注销 ChatController
  void unregisterChatController(String userId) {
    _activeChatControllers.remove(userId);
    if (Get.isLogEnable) {
      Get.log('注销 ChatController: $userId');
    }
  }

  /// 通知 ChatController 更新消息列表
  void _notifyChatControllers(List<EMMessage> messages) {
    try {
      // 遍历所有收到的消息
      for (var message in messages) {
        // 只处理接收到的消息（direction == RECEIVE）
        if (message.direction == MessageDirection.RECEIVE) {
          // 获取消息的发送者ID（from 属性）
          final fromId = message.from;

          if (fromId != null && fromId.isNotEmpty) {
            // 查找对应的 ChatController
            final controller = _activeChatControllers[fromId];
            if (controller != null) {
              controller.addReceivedMessage(message);
              if (Get.isLogEnable) {
                Get.log('通知 ChatController 更新消息: $fromId');
              }
            }
          }
        }
      }
    } catch (e) {
      if (Get.isLogEnable) {
        Get.log('通知 ChatController 更新消息列表失败: $e');
      }
    }
  }

  /// 刷新会话列表
  void _refreshConversationList() {
    try {
      // 尝试获取 ConversationController 并刷新会话列表
      if (Get.isRegistered<ConversationController>()) {
        final conversationController = Get.find<ConversationController>();
        conversationController.refreshConversations();
      }
    } catch (e) {
      // ConversationController 可能未注册，忽略错误
      if (Get.isLogEnable) {
        Get.log('刷新会话列表失败: $e');
      }
    }
  }

  /// 添加用户到黑名单
  Future<void> addToBlacklist(String userId) async {
    try {
      await EMClient.getInstance.contactManager.addUserToBlockList(userId);
      print('已将用户 $userId 添加到黑名单');
    } catch (e) {
      print('添加黑名单失败: $e');
      rethrow;
    }
  }

  /// 从黑名单移除用户
  Future<void> removeFromBlacklist(String userId) async {
    try {
      await EMClient.getInstance.contactManager.removeUserFromBlockList(userId);
      print('已将用户 $userId 从黑名单移除');
    } catch (e) {
      print('移除黑名单失败: $e');
      rethrow;
    }
  }

  /// 获取黑名单列表
  Future<List<String>> getBlacklist() async {
    try {
      final list = await EMClient.getInstance.contactManager.getBlockListFromServer();
      print('获取黑名单列表成功，共 ${list.length} 个用户');
      return list;
    } catch (e) {
      print('获取黑名单列表失败: $e');
      return [];
    }
  }

  /// 清理资源
  void dispose() {
    try {
      EMClient.getInstance.removeConnectionEventHandler("");
    } catch (e) {
      print('Failed to dispose resources: $e');
    }
  }
}

// 导出单例实例
final IMManager imManager = IMManager();