pirate-corsaire-server/Messages/ItemBuyMessage.js

const ItemBoughtPacket              = require("../Packets/ItemBought");
const packet_57                     = require("../Packets/packet_57");

const BASE_SHOP                     = require("../Data/shop");
const { SHOP, SHOP_ENTRIES_BUY }    = BASE_SHOP;

module.exports = async function (ws, message, player) {
    const categoryID = message.getUint8(1);
    const itemID = message.getUint8(2);
    const rawAmount = message.getUint32(3);

    let bought = {
        categoryID,
        id: itemID,
        amount: 0
    };

    const itemToBuy = SHOP.find(entry => entry.categoryID === categoryID && entry.itemID === itemID);
    console.info(categoryID, itemID, SHOP)
    if (!itemToBuy) {
        const boughtItemConfirmationPacket = ItemBoughtPacket(bought);
        return player.map.registerIndividualNetworkPacket(player.id, boughtItemConfirmationPacket);
    };

    const isItemAvailable = itemToBuy.isAvailable(player);
    if (!isItemAvailable) return;

    if (SHOP_ENTRIES_BUY[player.id] && SHOP_ENTRIES_BUY[player.id]?.[categoryID]?.[itemID] >= itemToBuy.maximumPlayerAmount) {
        bought = {
            categoryID,
            id: itemID,
            amount: 0
        };

        const boughtItemConfirmationPacket = ItemBoughtPacket(bought);
        return player.map.registerIndividualNetworkPacket(player.id, boughtItemConfirmationPacket);
    };
    
    const amount = rawAmount; // Math.min(rawAmount, (itemToBuy.maximumPlayerAmount || Infinity) - alreadyBoughtAmount)
    bought.amount = amount;
  
    player.rewardCallback({
        isRegular: true,
        authorID: player.id,
        source: {},
        rewards: [{
            categoryID,
            id: itemID, 
            amount
        }]
    });	

    player.inventory.refreshSingle({ 
        categoryID: 1,
        id: itemToBuy.currencyType,
        amount: itemToBuy.currencyAmount * amount * -1
    });

    const packets = [];
    const boughtItemConfirmationPacket = ItemBoughtPacket(bought);
    packets.push(boughtItemConfirmationPacket);
    
    console.info("bought", bought);

    if (false && alreadyBoughtAmount + amount >= itemToBuy.maximumPlayerAmount) {
        const removeShopEntryPacket = packet_57({
            id: itemID,
            shopCategoryID: itemToBuy.shopCategoryID
        });

        packets.push(removeShopEntryPacket);
    };
    
    player.map.registerIndividualNetworkPacket(player.id, packets);
};