flutter_app_android/lib/presentation/providers/auth_provider.dart

import 'package:flutter/material.dart';
import '../../data/models/user.dart';
import '../../data/models/auth/login_request.dart';
import '../../data/models/auth/register_request.dart';
import '../../data/repositories/auth_repository.dart';

class AuthProvider with ChangeNotifier {
  final AuthRepository authRepository;
  
  User? _user;
  bool _isLoading = false;
  String? _error;
  
  AuthProvider({required this.authRepository}) {
    _loadCurrentUser();
  }
  
  User? get user => _user;
  bool get isAuthenticated => _user != null;
  bool get isLoading => _isLoading;
  String? get error => _error;
  
  Future<void> _loadCurrentUser() async {
    final response = await authRepository.getCurrentUser();
    if (response.success && response.data != null) {
      _user = response.data;
      notifyListeners();
    }
  }
  
  Future<void> login(String username, String password) async {
    _isLoading = true;
    _error = null;
    notifyListeners();
    
    try {
      final response = await authRepository.login(
        LoginRequest(username: username, password: password),
      );
      
      if (response.success && response.data != null) {
        _user = response.data;
        _error = null;
      } else {
        _error = response.message;
      }
    } catch (e) {
      _error = '登录失败: $e';
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }
  
  Future<void> register(String username, String email, String password, String passwordConfirm, String? phone) async {
    _isLoading = true;
    _error = null;
    notifyListeners();
    
    try {
      final response = await authRepository.register(
        RegisterRequest(username: username, email: email, password: password, passwordConfirm: passwordConfirm),
      );
      
      if (response.success && response.data != null) {
        _user = response.data;
        _error = null;
      } else {
        _error = response.message;
      }
    } catch (e) {
      _error = '注册失败: $e';
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }
  
  Future<void> modifyPassword(String oldPassword, String newPassword) async {
    _isLoading = true;
    _error = null;
    notifyListeners();
    
    try {
      // 1. 调用API验证旧密码
      // final isValidOldPassword = await authRepository.validatePassword(oldPassword);

      // if (!isValidOldPassword) {
      //   _error = '当前密码不正确';
      //   return;
      // }

      // 2. 调用API更新密码
      // final response = await authRepository.updatePassword(
      //   LoginRequest(username: oldPassword, password: newPassword),
      // );
      
      // if (response.success && response.data != null) {
      //   // 可选：清除本地存储的token，让用户重新登录
      //   // await _authService.logout();
      //   _error = null;
      // } else {
      //   _error = response.message;
      // }
    } catch (e) {
      _error = '密码修改失败: $e';
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }
  
  Future<void> logout() async {
    _isLoading = true;
    _error = null;
    notifyListeners();
    
    try {
      final response = await authRepository.logout();
      
      if (response.success) {
        _user = null;
        _error = null;
      } else {
        _error = response.message;
      }
    } catch (e) {
      _error = '登出失败: $e';
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }
  
  Future<void> checkAuthStatus() async {
    final isLoggedIn = await authRepository.isLoggedIn();
    if (!isLoggedIn) {
      _user = null;
    } else {
      await _loadCurrentUser();
    }
    notifyListeners();
  }
  
  void clearError() {
    _error = null;
    notifyListeners();
  }

  void updateUser(User? user) {
    _user = user;
    notifyListeners();
  }
}