public virtual Result <BuyFromVendorResult <T> > BuyFromVendor(ICustomer <T> customer, T item, int amount = 1)
{
var canBuy = CanBuyFromVendor(customer, item, amount);
if (canBuy.result == false)
{
return(new Result <BuyFromVendorResult <T> >(null, canBuy.error));
}
// We make a clone of the item to make sure a new unique instance is returned.
// In the scenario where the user sells part of a stack to the vendor and buys it back he/she would buy back the exact same item instance, causing an error.
// NOTE: Try to find the specific item instance
var index = vendorCollection.IndexOf(o => o?.item != null && ReferenceEquals(o.item, item));
if (index == -1)
{
// Couldn't find specific; Try to find an item that's equal to the one we want.
index = vendorCollection.IndexOf(o => o?.item != null && o.item.Equals(item));
}
// No item found; Abort!
if (index == -1)
{
return(new Result <BuyFromVendorResult <T> >(null, Errors.VendorDoesNotContainItem));
}
var buyProduct = vendorCollection[index];
if (amount < vendorCollection.GetAmount(index))
{
// Not buying entire stack, so make a clone.
buyProduct = (IVendorProduct <T>)buyProduct.Clone();
}
if (config.removeBoughtProductFromVendor)
{
vendorCollection.Remove(buyProduct, amount);
}
foreach (var c in buyProduct.buyPrice)
{
vendorCurrencies.Add(c.currency, c.amount * amount * config.buyFromVendorPriceMultiplier);
}
customer.AddItem(buyProduct.item, amount);
foreach (var c in buyProduct.buyPrice)
{
customer.RemoveCurrency(c.currency, c.amount * amount * config.buyFromVendorPriceMultiplier);
}
var buyResult = new BuyFromVendorResult <T>(customer, buyProduct, amount, buyProduct.buyPrice);
OnBoughtFromVendor?.Invoke(this, buyResult);
return(buyResult);
}
