import 'package:flutter_secure_storage/flutter_secure_storage.dart';

/// Remembers scooter PINs in platform secure storage (Android Keystore backed
/// storage, iOS Keychain), keyed by the BLE peripheral id.
///
/// The peripheral id is not a permanent scooter identity (see ScooterDevice).
/// Once the Apollo UID is read over AT+UID? this should key by that instead.
class PinStore {
  PinStore([FlutterSecureStorage? storage])
      : _storage = storage ?? const FlutterSecureStorage();

  final FlutterSecureStorage _storage;

  String _key(String deviceId) => 'pin:$deviceId';

  Future<String?> read(String deviceId) async {
    try {
      return await _storage.read(key: _key(deviceId));
    } catch (_) {
      return null;
    }
  }

  Future<void> save(String deviceId, String pin) =>
      _storage.write(key: _key(deviceId), value: pin);

  Future<void> forget(String deviceId) => _storage.delete(key: _key(deviceId));
}