import 'package:flutter/foundation.dart';
import '../models/user.dart';
import '../services/api_service.dart';
import '../services/auth_service.dart';

class AuthProvider with ChangeNotifier {
  final ApiService _apiService = ApiService();
  late final AuthService _authService;

  User? _user;
  bool _isLoading = true;
  String? _error;

  AuthProvider() {
    _authService = AuthService(_apiService);
    _loadStoredUser();
  }

  User? get user => _user;
  bool get isLoading => _isLoading;
  bool get isAuthenticated => _user != null && !_user!.isExpired;
  String? get error => _error;
  String? get token => _user?.token;
  ApiService get apiService => _apiService;

  Future<void> _loadStoredUser() async {
    _isLoading = true;
    notifyListeners();

    _user = await _authService.getStoredUser();
    _isLoading = false;
    notifyListeners();
  }

  Future<bool> login(String username, String password) async {
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      _user = await _authService.login(username, password);
      _isLoading = false;

      if (_user == null) {
        _error = 'Invalid credentials';
      }

      notifyListeners();
      return _user != null;
    } catch (e) {
      _error = 'Connection error';
      _isLoading = false;
      notifyListeners();
      return false;
    }
  }

  Future<void> logout() async {
    await _authService.logout();
    _user = null;
    notifyListeners();
  }
}