import 'package:im_flutter_sdk/im_flutter_sdk.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;
  bool _isInitialized = false;

  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);

      // 注册监听器
      _registerListeners();

      _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');
        },
      ));
    } catch (e) {
      print('Failed to register listeners: $e');
    }
  }

  /// 登录IM服务
  Future<bool> login(String userId, String token) async {
    try {
      if (!_isInitialized) {
        print('IM SDK not initialized');
        return false;
      }

      await EMClient.getInstance.loginWithToken(userId, token);
      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 {
    try {
      // 创建文本消息
      final message = EMMessage.createTxtSendMessage(
        targetId: toChatUsername,
        content: content,
      );

      // 发送消息
      await EMClient.getInstance.chatManager.sendMessage(message);
      print('Text message sent successfully');
      return message;
    } catch (e) {
      print('Failed to send text 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;
    }
  }

  /// 获取会话列表
  Future<List<EMConversation>> getConversations() async {
    try {
      return EMClient.getInstance.chatManager.loadAllConversations();
    } catch (e) {
      print('Failed to get conversations: $e');
      return [];
    }
  }

  /// 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;
  }

  /// 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();