import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:problem_check_system/data/models/auth_model.dart';
import 'package:problem_check_system/app/routes/app_routes.dart';
import 'package:problem_check_system/data/repositories/auth_repository.dart';

class AuthController extends GetxController {
  final AuthRepository _authRepository;
  final TextEditingController usernameController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();

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

  AuthController({required AuthRepository authRepository})
    : _authRepository = authRepository;

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

  void _loadRememberedUser() {
    final remember = _authRepository.getRememberPassword();
    rememberPassword.value = remember;
    if (remember) {
      final loginData = _authRepository.getLoginKey();
      usernameController.text = loginData.username;
      passwordController.text = loginData.password;
    }
  }

  /// Check if the user is already logged in by delegating to the repository.
  bool isLoggedIn() {
    return _authRepository.isLoggedIn();
  }

  /// 登录逻辑
  Future<void> login() async {
    final username = usernameController.text.trim();
    final password = passwordController.text.trim();

    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;
    final loginData = LoginRequest(username: username, password: password);

    if (_authRepository.isOnline) {
      await _onlineLogin(loginData);
    } else {
      _offlineLogin(loginData);
    }
    isLoading.value = false;
  }

  /// 在线登录
  Future<void> _onlineLogin(LoginRequest loginRequest) async {
    try {
      var loginResponse = await _authRepository.login(loginRequest);
      // 登录成功后
      _authRepository.saveToken(loginResponse.token);
      _authRepository.saveRefreshToken(loginResponse.refreshToken);
      _authRepository.addRememberPassword(rememberPassword.value);

      if (rememberPassword.value) {
        _authRepository.addLoginKey(loginRequest);
      } else {
        _authRepository.removeLoginKey();
      }
      Get.offAllNamed(AppRoutes.home);
    } catch (e) {
      throw Exception(e);
    }
  }

  void _offlineLogin(LoginRequest loginRequest) {
    final loginData = _authRepository.getLoginKey();

    if (loginData.username == loginRequest.username &&
        loginData.password == loginRequest.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('登录失败', '无网络连接，且无法验证本地凭证');
    }
  }

  /// Handles the logout process by delegating to the repository.
  Future<void> logout() async {
    isLoading.value = true;
    await _authRepository.logout();
    isLoading.value = false;
    Get.offAllNamed(AppRoutes.login);
  }
}