local_auth_service.dart

import 'package:flutter/services.dart';
import 'package:local_auth/local_auth.dart';

class LocalAuthService {
  LocalAuthService() {
    _init();
  }
  final LocalAuthentication _localAuth = LocalAuthentication();
  bool _isSupported = false;
  bool get isSupported => _isSupported;
  bool _isAuthenticating = false;
  bool get isAuthenticating => _isAuthenticating;
  bool _authenticated = false;
  bool get authenticated => _authenticated;
  bool _canCheckBiometrics = false;
  bool get canCheckBiometrics => _canCheckBiometrics;
  List<BiometricType> _availableBiometrics = [];
  List<BiometricType> get availableBiometrics => _availableBiometrics;

  Future<void> _init() async {
    await checkDeviceSupported();
    await checkBiometrics();
  }

  Future<void> checkDeviceSupported() async {
    try {
      _isSupported = await _localAuth.isDeviceSupported();
    } on PlatformException catch (_) {
      _isSupported = false;
    }
  }

  Future<void> checkBiometrics() async {
    if (isSupported) {
      _canCheckBiometrics = await _localAuth.canCheckBiometrics;
    }
  }

  Future<void> getAvailableBiometrics() async {
    if (canCheckBiometrics) {
      _availableBiometrics = await _localAuth.getAvailableBiometrics();
    }
  }

  Future<void> authenticate({required String reason}) async {
    if (!isSupported) return;
    _isAuthenticating = true;
    _authenticated = await _localAuth.authenticate(
      localizedReason: reason,
      options: const AuthenticationOptions(stickyAuth: true),
    );
    _isAuthenticating = false;
  }

  Future<void> cancelAuthentication() async {
    await _localAuth.stopAuthentication();
    _isAuthenticating = false;
  }

  Future<void> authenticateWithBiometrics({required String reason}) async {
    if (!isSupported) return;
    if (!canCheckBiometrics) return;
    _isAuthenticating = true;
    _authenticated = await _localAuth.authenticate(
      localizedReason: reason,
      options: const AuthenticationOptions(
        stickyAuth: true,
        biometricOnly: true,
      ),
    );
    _isAuthenticating = false;
  }
}