Casha/lib/core/services/biometric_service.dart

import 'package:local_auth/local_auth.dart';
import 'package:shared_preferences/shared_preferences.dart';

class BiometricService {
  static final _auth = LocalAuthentication();
  static const _key = 'biometric_enabled';

  static Future<bool> isAvailable() async {
    final canCheck = await _auth.canCheckBiometrics;
    final isSupported = await _auth.isDeviceSupported();
    return canCheck && isSupported;
  }

  static Future<bool> isEnabled() async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getBool(_key) ?? false;
  }

  static Future<void> setEnabled(bool value) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool(_key, value);
  }

  static Future<bool> authenticate() async {
    try {
      return await _auth.authenticate(
        localizedReason: 'Confirm your identity to open Casha',
        options: const AuthenticationOptions(
          biometricOnly: false,
          stickyAuth: true,
        ),
      );
    } catch (_) {
      return false;
    }
  }
}