import 'dart:async';

import 'package:flutter_bloc/flutter_bloc.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/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 '../../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;

  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 user = await storage.getUser();
    if (user != null) {
      // 1. 建立 TCP 连接 (远程控制)
      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
      // 2. 同步全局 App 状态
      appCubit.setAuth(user);
      // 3. 进入已登录状态
      emit(AuthAuthenticated(user));
    } else {
      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");
    await storage.deleteUser();
    tcp.disconnect();
    appCubit.clearAuth();
    emit(AuthUnauthenticated());
  }

  /// TCP 指令监听
  void _listenToAuthResponse() {
    _kickOutSub?.cancel(); // 防止重复监听

    // 假设 0x12 是踢下线或多设备登录提醒
    _kickOutSub = dispatcher.onJsonMessage(0x12).listen((json) {
      // 如果后端发来指令确认需要退出
     // print('>>> [AUTH] 收到 0x12: $json'); //
      logout();
    });
  }

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