server-master/srcs/WingsAPI.Game.Extensions/Bazaar/BazaarExtensions.cs

using System;
using WingsAPI.Data.Bazaar;
using WingsAPI.Packets.Enums.Bazaar;

namespace WingsAPI.Game.Extensions.Bazaar
{
    public static class BazaarExtensions
    {
        public static BazaarListedItemType GetBazaarItemStatus(this BazaarItemDTO item)
        {
            if (item.ExpiryDate > DateTime.UtcNow)
            {
                return (item.Amount - item.SoldAmount) == 0 ? BazaarListedItemType.Sold : BazaarListedItemType.ForSale;
            }

            return (item.Amount - item.SoldAmount) != 0 ? BazaarListedItemType.DeadlineExpired : BazaarListedItemType.Sold;
        }

        public static bool PriceOrAmountExceeds(bool hasMedal, long pricePerItem, int amount)
            => pricePerItem < 1 || amount is > 999 or < 1 || (!hasMedal ? pricePerItem > 1_000_000 || pricePerItem * amount > 100_000_000 : pricePerItem * amount > 1_000_000_000);

        public static long NormalTax(long price)
        {
            return price switch
            {
                <= 100_000 => 500,
                >= 20_000_000 => 100_000,
                _ => (long)Math.Floor(price * 0.005)
            };
        }

        public static long MedalTax(long price, short days)
        {
            double multiplier = days * 0.0005;
            long rawResult = (long)((price - price % 2000) * multiplier);

            return rawResult switch
            {
                < 50 => 50,
                > 10_000 => 10_000,
                _ => rawResult
            };
        }
    }
}