Server.MirObjects.NPCScript.Buy C# (CSharp) Method

        public void Buy(PlayerObject player, ulong index, ushort count)
        {
            UserItem goods = null;

            for (int i = 0; i < Goods.Count; i++)
            {
                if (Goods[i].UniqueID != index) continue;
                goods = Goods[i];
                break;
            }

            bool isUsed = false;
            bool isBuyBack = false;

            var callingNPC = NPCObject.Get(player.NPCObjectID);

            if (callingNPC != null)
            {
                if (goods == null)
                {
                    for (int i = 0; i < callingNPC.UsedGoods.Count; i++)
                    {
                        if (callingNPC.UsedGoods[i].UniqueID != index) continue;
                        goods = callingNPC.UsedGoods[i];
                        isUsed = true;
                        break;
                    }
                }

                if (goods == null)
                {
                    if (!callingNPC.BuyBack.ContainsKey(player.Name)) callingNPC.BuyBack[player.Name] = new List<UserItem>();
                    for (int i = 0; i < callingNPC.BuyBack[player.Name].Count; i++)
                    {
                        if (callingNPC.BuyBack[player.Name][i].UniqueID != index) continue;
                        goods = callingNPC.BuyBack[player.Name][i];
                        isBuyBack = true;
                        break;
                    }
                }
            }

            if (goods == null || count == 0 || count > goods.Info.StackSize) return;

            if ((isBuyBack || isUsed) && count > goods.Count)
                count = goods.Count;
            else
                goods.Count = count;

            uint cost = goods.Price();
            cost = (uint)(cost * PriceRate(player));
            uint baseCost = (uint)(goods.Price() * PriceRate(player, true));

            if (player.NPCPage.Key.ToUpper() == PearlBuyKey)//pearl currency
            {
                if (cost > player.Info.PearlCount) return;
            }
            else if (cost > player.Account.Gold) return;

            UserItem item = (isBuyBack || isUsed) ? goods : Envir.CreateFreshItem(goods.Info);
            item.Count = goods.Count;

            if (!player.CanGainItem(item)) return;

            if (player.NPCPage.Key.ToUpper() == PearlBuyKey)
            {
                player.IntelligentCreatureLosePearls((int)cost);
            }
            else
            {
                player.Account.Gold -= cost;
                player.Enqueue(new S.LoseGold { Gold = cost });

                if (callingNPC != null && callingNPC.Conq != null)
                {
                    callingNPC.Conq.GoldStorage += (cost - baseCost);
                }
            }
            player.GainItem(item);

            if (isUsed)
            {
                callingNPC.UsedGoods.Remove(goods); //If used or buyback will destroy whole stack instead of reducing to remaining quantity

                List<UserItem> newGoodsList = new List<UserItem>();
                newGoodsList.AddRange(Goods);
                newGoodsList.AddRange(callingNPC.UsedGoods);

                callingNPC.NeedSave = true;

                player.Enqueue(new S.NPCGoods 
                { 
                    List = newGoodsList, 
                    Rate = PriceRate(player), 
                    HideAddedStats = Settings.GoodsHideAddedStats, 
                    Type = player.NPCPage.Key.ToUpper() == BuyUsedKey ? PanelType.BuySub : PanelType.Buy 
                });
            }

            if (isBuyBack)
            {
                callingNPC.BuyBack[player.Name].Remove(goods); //If used or buyback will destroy whole stack instead of reducing to remaining quantity
                player.Enqueue(new S.NPCGoods { List = callingNPC.BuyBack[player.Name], Rate = PriceRate(player), HideAddedStats = false });
            }
        }
        public void Sell(PlayerObject player, UserItem item)