API/TOOHUCardAPI/Data/Services/GameConfigurationService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using TOOHUCardAPI.Data.Repositories;
using TOOHUCardAPI.DTO;

namespace TOOHUCardAPI.Data.Services
{
    public class GameConfigurationService
    {
        private readonly ILogger<GameConfigurationService> _logger;
        private readonly CardRepository _cardRepository;

        private List<string> _cardBlacklist = new()
        {
            "_",
            "BonusEgg"
        };

        public GameConfigurationService(ILogger<GameConfigurationService> logger, CardRepository cardRepository)
        {
            _logger = logger;
            _cardRepository = cardRepository;
        }

        public async Task<GameConfigResponse> GetGameConfiguration()
        {
            var random = new Random(DateTime.Now.Date.GetHashCode());
            GameConfigResponse response = new GameConfigResponse();
            var cards = await _cardRepository.GetAllCards();
            var validCards =
                cards.Where(card => _cardBlacklist.Select(bl => !card.CardName.Contains(bl)).All(res => res))
                    .Select(card => card.CardName).Append("all");
            var enumerable = validCards as string[] ?? validCards.ToArray();
            var index = random.Next(0, enumerable.Length);
            response.LuckCard = enumerable.ElementAt(index);
            response.GameMessage = response.GameMessage + $" Today's lucky card is {response.LuckCard}!";
            return response;
        }
    }
}