import 'package:shared_preferences/shared_preferences.dart';

/// Stores a per-trip offline toggle to trigger background caching later.
class OfflineFlagService {
  /// Returns whether offline caching is enabled for [tripId].
  Future<bool> isOfflineEnabled(String tripId) async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getBool(_key(tripId)) ?? false;
  }

  /// Persists the offline toggle.
  Future<void> setOfflineEnabled(String tripId, bool enabled) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool(_key(tripId), enabled);
  }

  String _key(String tripId) => 'offline_trip_$tripId';
}