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

class AuthProvider extends ChangeNotifier {
  final AuthService _authService = AuthService();

  UserModel? _user;
  bool _loading = false;

  UserModel? get user => _user;
  bool get loading => _loading;

  /// Login with username/email and password.
  Future<void> login(String username, String password) async {
    _loading = true;
    notifyListeners();

    try {
      final user = await _authService.login(username, password);
      _user = user;
    } finally {
      _loading = false;
      notifyListeners();
    }
  }

  /// Register wrapper that is compatible with both old and new callers.
  ///
  /// Preferred: provide [email], [phoneNumber], [password].
  /// Older callers that pass [username] will still work — username is ignored
  /// for the backend call (we use email/phone/password as per API spec).
  Future<void> register({
    String? username, // kept for backward compatibility; not sent to backend
    String? email,
    required String password,
    String? phoneNumber,
  }) async {
    _loading = true;
    notifyListeners();

    try {
      // Prefer explicit email param; if not provided try to use username (some screens passed email as username)
      final resolvedEmail = (email != null && email.isNotEmpty) ? email : (username ?? '');

      // Ensure we always pass a string phoneNumber to the AuthService (it expects a non-null value)
      final resolvedPhone = phoneNumber ?? '';

      final user = await _authService.register(
        email: resolvedEmail,
        phoneNumber: resolvedPhone,
        password: password,
      );

      _user = user;
    } finally {
      _loading = false;
      notifyListeners();
    }
  }

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