import 'package:flutter/material.dart';
import 'token_service.dart';
import '../models/user_model.dart';

/// 认证状态管理
class AuthProvider extends ChangeNotifier {
  final TokenService _tokenService = TokenService();

  bool _isLoading = false;
  bool _isAuthenticated = false;
  UserModel? _currentUser;
  String? _errorMessage;

  bool get isLoading => _isLoading;
  bool get isAuthenticated => _isAuthenticated;
  UserModel? get currentUser => _currentUser;
  String? get errorMessage => _errorMessage;

  /// 初始化认证状态
  Future<void> init() async {
    _isAuthenticated = await _tokenService.isLoggedIn();
    if (_isAuthenticated) {
      // TODO: 从接口获取用户信息
      _currentUser = UserModel(
        id: '1',
        username: 'admin',
        name: '管理员',
        role: 'admin',
      );
    }
    notifyListeners();
  }

  /// 登录
  Future<bool> login({
    required String username,
    required String password,
  }) async {
    _isLoading = true;
    _errorMessage = null;
    notifyListeners();

    try {
      // TODO: 调用实际登录接口
      // final response = await DioClient().post('/auth/login', data: {
      //   'username': username,
      //   'password': password,
      // });

      // 模拟登录成功
      await _tokenService.saveTokens(
        token: 'mock_access_token_${DateTime.now().millisecondsSinceEpoch}',
        refreshToken: 'mock_refresh_token',
        expiresIn: 7200,
      );

      _currentUser = UserModel(
        id: '1',
        username: username,
        name: username == 'admin' ? '管理员' : username,
        role: 'admin',
      );
      _isAuthenticated = true;
      _isLoading = false;
      notifyListeners();
      return true;
    } catch (e) {
      _errorMessage = '登录失败，请检查用户名和密码';
      _isLoading = false;
      notifyListeners();
      return false;
    }
  }

  /// 登出
  Future<void> logout() async {
    await _tokenService.clearTokens();
    _isAuthenticated = false;
    _currentUser = null;
    notifyListeners();
  }
}