mnemo_cards/mnemo_cards_backend/lib/api/ads/ads_manager.dart

import 'package:injectable/injectable.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
import 'package:crypto/crypto.dart' as crypto;

@lazySingleton
class AdsManager {
  final _salt = 'elmhqun0d58iqm265bmqlg4oymqujrub';

  AdsManager();

  String getAdsKey(List<MnemoCardsProductModel> products, UserModel user) {
    final productString = (products.toList()
          ..sort((p, n) => (p.id ?? '').compareTo(n.id ?? '')))
        .map((product) => '${product.type.name}_${product.id}')
        .join(',');
    final userId = user.id.toString();
    final hash = crypto.sha256
        .convert(
          '${productString}_${userId}_$_salt'.codeUnits,
        )
        .toString();
    return hash;
  }
}