water-management-system/mobile/lib/services/auth_service.dart

import 'package:flutter/foundation.dart';
import 'package:dio/dio.dart';
import 'package:shared_preferences/shared_preferences.dart';

class AuthService extends ChangeNotifier {
  String _token = '';
  bool get isLoggedIn => _token.isNotEmpty;

  final Dio _dio = Dio(BaseOptions(baseUrl: 'http://10.0.2.2:8080/api/base'));

  Future<bool> login(String username, String password) async {
    try {
      final res = await _dio.post('/auth/login', data: {'username': username, 'password': password});
      if (res.data['code'] == 200) {
        _token = res.data['data'];
        final prefs = await SharedPreferences.getInstance();
        await prefs.setString('token', _token);
        notifyListeners();
        return true;
      }
    } catch (e) {
      debugPrint('Login failed: $e');
    }
    return false;
  }

  Future<void> logout() async {
    _token = '';
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove('token');
    notifyListeners();
  }
}