mnemo_cards/mnemo_cards_backend/lib/cron/add_free_packs.dart

import 'package:mnemo_cards_backend/packs/free_packs_distributor.dart';
import 'package:mnemo_cards_backend/user/user_repository.dart';

import 'task.dart' as task;

class AddFreePacks with task.Task {
  final FreePacksDistributor _freePacksDistributor;
  final UserRepository _userRepository;

  AddFreePacks(this._freePacksDistributor, this._userRepository);

  @override
  String get name => 'add_free_packs';

  @override
  Future<void> task() async {
    final freePacks = await _freePacksDistributor.getFreePacks();

    print('$name found ${freePacks.length} free packs');
    if (freePacks.isEmpty) {
      print('No free packs found');
      return;
    }

    final freePackIds = freePacks.map((p) => p.id).toSet();

    // Получаем всех пользователей
    final allUsers = await _userRepository.getAllUsers();

    // Фильтруем пользователей, у которых нет хотя бы одного из freePacks
    final usersToUpdate = <String>[];
    for (final user in allUsers) {
      if (user.id == null) continue;
      final userPacks = await _userRepository.getUserPacks(user.id!);
      final userPackIds = userPacks.map((p) => p.id).whereType<String>().toSet();

      // Если у пользователя нет хотя бы одного из freePacks
      if (!freePackIds.every((packId) => userPackIds.contains(packId))) {
        usersToUpdate.add(user.id!);
      }
    }

    print(
      'Found ${usersToUpdate.length} users for ${freePacks.length} free packs: ${freePacks.map((e) => e.title).join(',')}',
    );

    // Добавляем freePacks пользователям
    for (final userId in usersToUpdate) {
      try {
        for (final pack in freePacks) {
          if (pack.id == null) continue;
          await _userRepository.grantPackAccess(
            userId: userId,
            packId: pack.id!,
            grantType: 'free',
          );
        }
      } catch (e) {
        print('$name on user $userId: $e');
      }
    }
  }

  @override
  int get intervalSeconds => 600;
}