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

class AuthViewModel with ChangeNotifier {
  final AuthRepository _authRepository;

  AuthViewModel({required AuthRepository authRepository})
    : _authRepository = authRepository {
    usernameController.addListener(_onTextChanged);
    passwordController.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;
  bool _isLoggedIn = false;
  String? _errorMessage;
  Customer? _loggedInUser;
  String? successMessage;
  Role? _userRole;

  bool get isLoading => _isLoading;
  bool get isLoggedIn => _isLoggedIn;
  String? get errorMessage => _errorMessage;
  Customer? get loggedInUser => _loggedInUser;
  Role? get userRole => _userRole;

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

  Future<void> hydrateFromStorage() async {
    try {
      final customer = await _authRepository.getStoredCustomer();
      if (customer != null) {
        _loggedInUser = customer;
        _userRole = customer.role == 'admin' ? Role.admin : Role.analyst;
        notifyListeners();
      }
    } catch (e) {
      AppLogger().error('❌ Failed to hydrate auth state: $e');
    }
  }

  void _onTextChanged() {
    notifyListeners();
  }

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

    await localLogout();

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

    switch (result) {
      case Ok<LoginResponseModel>():
        _loggedInUser = result.value.data.customer;
        _userRole = _loggedInUser?.role == 'admin' ? Role.admin : Role.analyst;
        usernameController.clear();
        passwordController.clear();
        break;
      case Error<LoginResponseModel>():
        _errorMessage = result.error.toString();
        notifyListeners();
        break;
    }

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

  Future<void> localLogout() async {
    try {
      await _authRepository.localLogout();
    } catch (e) {
      // Handle local logout exceptions gracefully
      AppLogger().error('❌ Failed to local logout: $e');
    }
    _loggedInUser = null;
    _isLoggedIn = false;
    notifyListeners();
  }

  Future<void> checkIsLoggedIn() async {
    final result = await _authRepository.checkIsLoggedIn();

    if (result is Ok<bool>) {
      if (result.value) {
        _isLoggedIn = result.value;

        // Restore customer data from SharedPreferences
        final customer = await _authRepository.getStoredCustomer();
        if (customer != null) {
          _loggedInUser = customer;
          _userRole = customer.role == 'admin' ? Role.admin : Role.analyst;
        }
      } else {
        _isLoggedIn = false;
        _loggedInUser = null;
        _userRole = null;
      }
    } else {
      _isLoggedIn = false;
      _loggedInUser = null;
      _userRole = null;
    }
    notifyListeners();
  }

  void clearAuthFlow() {
    _errorMessage = null;
    successMessage = null;
    usernameController.clear();
    passwordController.clear();
    _isLoggedIn = false;
    _loggedInUser = null;
    _userRole = null;
    notifyListeners();
  }

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

    super.dispose();
  }
}

enum Role { admin, analyst }