/// <summary>
/// Remove from stock 'amountToBuy' products
/// </summary>
/// <param name="numberToRemove"></param>
/// <returns>new amount id succeed ,otherwise -1</returns>
private int removeFromStock(Product p, int amountToBuy)
{
if (!amountIsLegal(p.amount - amountToBuy))
{
return(-1);
}
p.amount -= amountToBuy;
WorkShop.Update(this);
return(p.amount);
}
/// <summary>
/// succseed - callback that return the products to the stock. if fail - returns null
/// </summary>
/// <param name="user"></param>
/// <param name="p"></param>
/// <param name="amountToBuy"></param>
/// <returns> succseed - callback that return the products to the stock., fail - returns null</returns>
public callback buyProduct(Product p, int amountToBuy)
{
callback callback = delegate()
{
if (GetStockAsDictionary().ContainsKey(p.getId()))
{
GetStockAsDictionary()[p.getId()].amount += amountToBuy;
}
WorkShop.Update(this);
};
if (!GetStockAsDictionary().ContainsKey(p.getId()) || removeFromStock(GetStockAsDictionary()[p.getId()], amountToBuy) == -1)
{
return(null);
}
return(callback);
}