problem_check_system/lib/modules/auth/controllers/auth_controller.dart

// lib/modules/auth/controllers/auth_controller.dart
import 'package:flutter/material.dart'; // 导入此库以使用 TextEditingController
import 'package:get/get.dart';
import 'package:dio/dio.dart';
import 'package:get_storage/get_storage.dart';
import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:problem_check_system/data/providers/auth_provider.dart';
import 'package:problem_check_system/data/models/login_model.dart';
import 'package:problem_check_system/app/routes/app_routes.dart';

class AuthController extends GetxController {
  final AuthProvider _authProvider;
  final GetStorage _storage;

  // 将 TextEditingController 移动到控制器中，由控制器管理它们的生命周期
  late final TextEditingController usernameController;
  late final TextEditingController passwordController;

  final isLoading = false.obs;
  final rememberPassword = false.obs;

  static const _usernameKey = 'username';
  static const _passwordKey = 'password';

  AuthController({
    required AuthProvider authProvider,
    required GetStorage storage,
  }) : _authProvider = authProvider,
       _storage = storage;

  @override
  void onInit() {
    super.onInit();
    // 在 onInit 中初始化控制器
    usernameController = TextEditingController();
    passwordController = TextEditingController();
    _loadSavedCredentials();
  }

  @override
  void onClose() {
    // 在 onClose 中销毁控制器，防止内存泄漏
    usernameController.dispose();
    passwordController.dispose();
    super.onClose();
  }

  void _loadSavedCredentials() {
    final savedUsername = _storage.read(_usernameKey);
    final savedPassword = _storage.read(_passwordKey);

    if (savedUsername != null && savedPassword != null) {
      // 从本地存储加载值，并设置给控制器
      usernameController.text = savedUsername;
      passwordController.text = savedPassword;
      rememberPassword.value = true;
    }
  }

  String getToken() {
    return _storage.read('token') ?? '';
  }

  // 移除了 updateUsername 和 updatePassword 方法，因为不再需要它们来同步值。
  // TextEditingController 本身就是值的来源。

  Future<void> login() async {
    // 直接从控制器获取文本内容
    final username = usernameController.text;
    final password = passwordController.text;

    if (username.isEmpty || password.isEmpty) {
      Get.snackbar('输入错误', '用户名和密码不能为空');
      return;
    }

    isLoading.value = true;

    var connectivityResult = await (Connectivity().checkConnectivity());
    bool isConnected =
        connectivityResult.contains(ConnectivityResult.mobile) ||
        connectivityResult.contains(ConnectivityResult.wifi) ||
        connectivityResult.contains(ConnectivityResult.ethernet);

    if (isConnected) {
      await _onlineLogin(username, password);
    } else {
      await _offlineLogin(username, password);
    }

    isLoading.value = false;
  }

  Future<void> _onlineLogin(String username, String password) async {
    try {
      final loginData = LoginModel(username: username, password: password);

      final response = await _authProvider.signIn(loginData);

      if (response.statusCode == 200 && response.data['token'] != null) {
        final token = response.data['token'];
        final refreshToken = response.data['refreshToken'];

        _storage.write('token', token);
        _storage.write('refreshToken', refreshToken);

        // 如果记住密码，保存用户名和密码
        if (rememberPassword.value) {
          _storage.write(_usernameKey, username);
          _storage.write(_passwordKey, password);
        } else {
          // 否则清除所有本地凭据
          _storage.remove(_usernameKey);
          _storage.remove(_passwordKey);
        }

        Get.offAllNamed(AppRoutes.home);
      } else {
        Get.snackbar('登录失败', '服务器返回了异常数据');
      }
    } on DioException catch (e) {
      if (e.response?.data != null && e.response?.data['detail'] != null) {
        final serverMessage = e.response!.data['detail'];
        Get.snackbar('登录失败', serverMessage);
      } else {
        Get.snackbar('网络错误', '登录失败，请检查您的网络连接');
      }
    } catch (e) {
      Get.snackbar('错误', '发生未知错误: ${e.toString()}');
    }
  }

  Future<void> _offlineLogin(String username, String password) async {
    final storedUsername = _storage.read(_usernameKey);
    final storedPassword = _storage.read(_passwordKey);

    if (storedUsername != null &&
        storedPassword != null &&
        storedUsername == username &&
        storedPassword == password) {
      Get.offAllNamed(AppRoutes.home);
      Get.snackbar('离线登录成功', '您已离线登录到系统');
    } else {
      Get.snackbar('离线登录失败', '无网络连接，且无法验证本地凭证');
    }
  }

  Future<void> logout() async {
    _storage.remove('token');
    _storage.remove('refreshToken');
    Get.offAllNamed(AppRoutes.login);
  }
}