problem_check_system/lib/controllers/auth_controller.dart

import 'package:get/get.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:dio/dio.dart';
import '../services/local_database.dart';

class AuthController extends GetxController {
  final LocalDatabase _localDatabase = LocalDatabase();
  final RxBool isLoggedIn = false.obs;
  final RxBool isOnlineMode = false.obs;
  final RxString username = ''.obs;

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

  Future<void> checkLoginStatus() async {
    final prefs = await SharedPreferences.getInstance();
    final offlineLogin = prefs.getBool('offlineLogin') ?? false;
    isLoggedIn.value = offlineLogin;

    if (offlineLogin) {
      username.value = prefs.getString('username') ?? '离线用户';
    }
  }

  Future<bool> offlineLogin(String username) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool('offlineLogin', true);
    await prefs.setString('username', username);

    isLoggedIn.value = true;
    this.username.value = username;
    isOnlineMode.value = false;

    return true;
  }

  Future<bool> onlineLogin(String username, String password) async {
    try {
      final dio = Dio();
      final response = await dio.post(
        'https://your-server.com/api/login',
        data: {'username': username, 'password': password},
      );

      if (response.statusCode == 200) {
        final prefs = await SharedPreferences.getInstance();
        await prefs.setBool('offlineLogin', false);
        await prefs.setString('username', username);

        isLoggedIn.value = true;
        this.username.value = username;
        isOnlineMode.value = true;

        return true;
      }
      return false;
    } catch (e) {
      return false;
    }
  }

  Future<void> logout() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove('offlineLogin');
    await prefs.remove('username');

    isLoggedIn.value = false;
    username.value = '';
  }
}