import '../security/secret_store.dart';

/// User choices for the (Block 2) social layer: the coarse area to publish/
/// browse offers in, and which community relays to talk to. Backed by the OS
/// keystore (via [SecretStore]) to honour "no plaintext at rest" — no
/// shared_preferences.
///
/// Both default to "unset": empty area and no relays mean the social layer is
/// simply unavailable, and the app stays fully usable offline.
class SocialSettings {
  SocialSettings(this._store);

  final SecretStore _store;

  static const _areaKey = 'tane.social.area_geohash';
  static const _relaysKey = 'tane.social.relays';

  /// The user's coarse area as a low-precision geohash (may be empty). Set
  /// manually or from device location; the transport coarsens it further.
  Future<String> areaGeohash() async => (await _store.read(_areaKey)) ?? '';

  Future<void> setAreaGeohash(String geohash) =>
      _store.write(_areaKey, geohash.trim().toLowerCase());

  /// Configured community relay URLs (empty by default — the user adds their
  /// own; we bundle none, to avoid leaking metadata to third-party relays).
  Future<List<String>> relayUrls() async {
    final raw = await _store.read(_relaysKey);
    if (raw == null || raw.isEmpty) return const [];
    return raw.split('\n').where((s) => s.trim().isNotEmpty).toList();
  }

  Future<void> setRelayUrls(List<String> urls) => _store.write(
        _relaysKey,
        urls.map((u) => u.trim()).where((u) => u.isNotEmpty).join('\n'),
      );

  /// Whether the social layer has enough config to attempt going online.
  Future<bool> get isConfigured async =>
      (await relayUrls()).isNotEmpty && (await areaGeohash()).isNotEmpty;
}