tm_app/lib/view_models/auth_view_model.dart

import 'package:flutter/material.dart';
import 'package:tm_app/data/services/model/customer/customer.dart';

import '../core/utils/result.dart';
import '../data/repositories/auth_repository.dart';
import '../data/services/model/login_response/login_response_model.dart';
import '../data/services/model/logout_response/logout_response.dart';

class AuthViewModel with ChangeNotifier {
  final AuthRepository _authRepository;

  AuthViewModel({required AuthRepository authRepository})
    : _authRepository = authRepository {
    usernameController.addListener(_onTextChanged);
    passwordController.addListener(_onTextChanged);
    // usernameFocus.addListener(_onTextChanged);
    // passwordFocus.addListener(_onTextChanged);
  }

  final TextEditingController usernameController = TextEditingController();
  final TextEditingController passwordController = TextEditingController();
  final FocusNode usernameFocus = FocusNode();
  final FocusNode passwordFocus = FocusNode();

  bool _obscurePassword = true;
  bool get obscurePassword => _obscurePassword;
  bool get isLoginEnabled =>
      usernameController.text.isNotEmpty && passwordController.text.isNotEmpty;

  // Auth state
  bool _isLoading = false;
  String? _errorMessage;
  Customer? _loggedInUser;

  bool get isLoading => _isLoading;
  String? get errorMessage => _errorMessage;
  Customer? get loggedInUser => _loggedInUser;

  void togglePasswordVisibility() {
    _obscurePassword = !_obscurePassword;
    notifyListeners();
  }

  void _onTextChanged() {
    notifyListeners();
  }

  Future<void> login() async {
    _isLoading = true;
    _errorMessage = null;
    notifyListeners();

    final result = await _authRepository.login(
      username: usernameController.text.trim(),
      password: passwordController.text.trim(),
    );

    switch (result) {
      case Ok<LoginResponseModel>():
        _loggedInUser = result.value.data.customer;
        usernameController.text.trim();
        passwordController.text.trim();
        usernameController.clear();
        passwordController.clear();
        break;
      case Error<LoginResponseModel>():
        _errorMessage = result.error.toString();
        break;
    }

    _isLoading = false;
    notifyListeners();
    _errorMessage = null;
    notifyListeners();
  }

  Future<void> logout() async {
    _errorMessage = null;
    notifyListeners();

    final result = await _authRepository.logout();

    switch (result) {
      case Ok<LogoutResponse>():
        _loggedInUser = null;
        break;
      case Error<LogoutResponse>():
        _errorMessage = result.error.toString();
        break;
    }

    notifyListeners();
    _errorMessage = null;
    notifyListeners();
  }

  @override
  void dispose() {
    usernameController.dispose();
    passwordController.dispose();
    usernameFocus.dispose();
    passwordFocus.dispose();
    super.dispose();
  }
}