import 'dart:async';
import 'dart:convert';

import 'package:flutter/cupertino.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:get_it/get_it.dart';
import 'package:maibu_satabot_v2/core/consts/tcp_consts.dart';
import 'package:maibu_satabot_v2/core/domain/entities/user_entity.dart';
import 'package:maibu_satabot_v2/core/network/net_message_dispatcher.dart';

import '../../../../core/app/app_user_cubit.dart';
import '../../../../core/infrastructure/logging/sentry_logger_impl.dart';
import '../../../../core/logging/i_logger_service.dart';
import '../../../../core/network/tcp/tcp_client.dart';
import '../../../../core/storage/user_storage.dart';
import '../../../devices/domain/usecases/get_user_device_usecase.dart';
import '../../../devices/domain/usecases/switch_device_usecase.dart';
import '../../../devices/presentation/bloc/devices_cubit.dart';
import '../../../devices/presentation/bloc/device_status_bloc.dart';
import '../../../devices/presentation/bloc/device_status_event.dart';
import '../../../devices/presentation/bloc/devices_state.dart';
import '../../../../features/v2/site/presentation/cubit/site_cubit.dart';
import '../../data/datasources/auth_tcp_datasource.dart';
import '../../data/datasources/impl/auth_tcp_datasource_impl.dart';
import 'auth_state.dart';

/// emit做的事情：
/// 1.修改状态标志：通过改变类的类型（从 Initial 变成 Authenticated）
/// 2.携带数据：把 user 对象塞进了状态里，让外部能拿到
/// 3.发送通知：自动触发监听（如 GoRouter 的刷新）。
class AuthCubit extends Cubit<AuthState> {
  final UserStorage storage;
  final TcpClient tcp;
  final AppUserCubit appCubit;
  final NetMessageDispatcher dispatcher;
  final AuthTcpDatasource _authTcpDatasource;
  final ILoggerService _logger = GetIt.I<ILoggerService>();

  StreamSubscription? _kickOutSub; // 新增：用于管理监听生命周期

  AuthCubit(this.storage, this.tcp, this.appCubit, this.dispatcher, this._authTcpDatasource) : super(AuthInitial()) {
    // Cubit 一启动就开始监听 TCP 的“自动逻辑”
    _listenToAuthResponse();
  }

  /// App 启动时检查本地缓存
  Future<void> appStarted() async {
    final logger = GetIt.I<ILoggerService>() as SentryLoggerImpl;
    try {
      final user = await storage.getUser();
      logger.logWithLevel(
          '启动时检查本地缓存',
          level: 'INFO',
          data: {'user': user != null ? '找到用户: ${user.username}' : '未找到用户'}
      );
      
      if (user != null) {
        // await tcp.connect(host: TCPConsts.TCP_IP, port: TCPConsts.TCP_PORT);
        // await _authTcpDatasource.sendAuthPacket();//包括发送认证包和获取列表和切换函数
        // tcp.startHeartbeat(interval: const Duration(seconds: 4));
        
        // 2. 同步全局 App 状态
        appCubit.setAuth(user);
        // 3. 进入已登录状态
        emit(AuthAuthenticated(user));
        logger.logWithLevel('✅ [AUTH] 应用启动 - 已恢复登录状态', level: 'INFO');
      } else {
        logger.logWithLevel('⚠️ [AUTH] 应用启动 - 无本地缓存，进入未登录状态', level: 'INFO');
        emit(AuthUnauthenticated());
      }
    } catch (e) {
      logger.logWithLevel('❌ [AUTH] 应用启动检查失败: $e', level: 'ERROR');
      emit(AuthUnauthenticated());
    }
  }

  /// 当 HTTP 登录/注册成功后调用
  Future<void> loginSuccess(UserEntity user) async {
    await storage.saveUser(user);
  //  await tcp.connect(host: TCPConsts.TCP_IP, port: TCPConsts.TCP_PORT);
          // await _authTcpDatasource.sendAuthPacket(); //包括发送认证包和获取列表和切换函数
           //tcp.startHeartbeat(interval: const Duration(seconds: 4)); //启动心跳
    appCubit.setAuth(user);
    emit(AuthAuthenticated(user));
  }

  /// 退出登录 (主动或被动)
  Future<void> logout() async {
    //print("退出登录");
    
    // 🔥 关键修复:在断开TCP前,先清空所有业务状态,避免重连触发旧数据
    _clearAllBusinessState();
    
    await storage.deleteUser();
    tcp.disconnect();
    appCubit.clearAuth();
    emit(AuthUnauthenticated());
  }

  /// 🔥 新增:清空所有业务状态,防止数据泄露到新账户
  void _clearAllBusinessState() {
    try {
      final devicesCubit = GetIt.I<DevicesCubit>();
      final deviceStatusBloc = GetIt.I<DeviceStatusBloc>();
      final siteCubit = GetIt.I<SiteCubit>();
      
      // 1. 清空设备列表和选中设备
      devicesCubit.emit(const DevicesState());
      debugPrint('✅ [AUTH] 已清空 DevicesCubit 状态');
      _logger.logWithLevel('✅ [AUTH] 已清空 DevicesCubit 状态');
      
      // 2. 清空设备实时状态
      deviceStatusBloc.add(DeviceStatusReset());
      debugPrint('✅ [AUTH] 已重置 DeviceStatusBloc 状态');
      _logger.logWithLevel('✅ [AUTH] 已重置 DeviceStatusBloc 状态');
      
      // 3. 清空全局选中的场站
      siteCubit.clearSelectedSite();
      debugPrint('✅ [AUTH] 已清空 SiteCubit 选中状态');
      _logger.logWithLevel('✅ [AUTH] 已清空 SiteCubit 选中状态');
      
      debugPrint('✅ [AUTH] 所有业务状态已清空');
      _logger.logWithLevel('✅ [AUTH] 所有业务状态已清空');
    } catch (e) {
      debugPrint('❌ [AUTH] 清空业务状态失败: $e');
      _logger.logWithLevel('❌ [AUTH] 清空业务状态失败: $e', level: 'ERROR');
    }
  }

  /// TCP 指令监听
  void _listenToAuthResponse() {
    _logger.logWithLevel('[AUTH] 监听 TCP 0x12 指令...', level: 'DEBUG');
    _kickOutSub?.cancel(); // 防止重复监听

    // 直接监听原始数据包，自己处理 JSON 解析（去掉 CRC 字节）
    _kickOutSub = dispatcher.onCommand(0x12).listen((packet) {
      _logger.logWithLevel('[AUTH] 获取原始包：$packet', level: 'DEBUG');
      _logger.logWithLevel('>>> [AUTH] 收到 0x12 原始包，payload 长度=${packet.payload.length}, 内容=${packet.payload}', level: 'DEBUG');
      try {
        // 🔥 关键：手动去掉最后 2 个 CRC 字节
        String jsonString;
        if (packet.payload.length > 2) {
          jsonString = utf8.decode(packet.payload.sublist(0, packet.payload.length - 2));
        } else {
          jsonString = utf8.decode(packet.payload);
        }
        _logger.logWithLevel('[AUTH] 获取 JSON: $jsonString', level: 'DEBUG');

        final jsonMap = jsonDecode(jsonString);
        _logger.logWithLevel('[AUTH] 获取 JSON Map: $jsonMap', level: 'DEBUG');

        final respond = jsonMap['respond'] ?? '';
        if (respond == 'have_logged_in') {
          _logger.logWithLevel('[AUTH] ⚠️ 检测到异地登录 (respond=have_logged_in)，开始退出...', level: 'WARN');
          logout();
        } else {
          _logger.logWithLevel('[AUTH] ⚠️ 检测到异地登录 (respond=$respond)，开始退出...', level: 'WARN');
        }
      } catch (e) {
        _logger.logWithLevel('[AUTH] ❌ JSON 解析失败：$e', level: 'ERROR');
      }
    });
  _logger.logWithLevel('[AUTH] 监听 TCP 0x12 指令...', level: 'DEBUG');
  }



  @override
  Future<void> close() {
    _kickOutSub?.cancel(); // 销毁 Cubit 时关闭监听
    return super.close();
  }


  /// 🔥 息屏/后台后恢复到前台时的重连方法
  Future<void> reconnectAfterResume() async {
    _logger.logWithLevel('[AUTH] 检测到应用恢复到前台，检查 TCP 连接状态...', level: 'DEBUG');
    // 如果 TCP 未连接，则执行重连
    if (!tcp.isConnected) {
      _logger.logWithLevel('[AUTH] TCP 未连接，开始重连...',
          level: 'DEBUG');
      try {
        await tcp.connect(host: TCPConsts.TCP_IP, port: TCPConsts.TCP_PORT);
        tcp.startHeartbeat(interval: const Duration(seconds: 4));
        _logger.logWithLevel('[AUTH] TCP 重连成功！', level: 'DEBUG');
      } catch (e) {
      _logger.logWithLevel('[AUTH] TCP 重连失败：$e', level: 'ERROR');
      }
    } else {
      _logger.logWithLevel('[AUTH] TCP 已连接，无需重连', level: 'DEBUG');
      // 可选：发送一个心跳包确认连接有效
      tcp.sendHeartbeat();
    }
  }
}