public bool PurchaseProduct(IProduct product, IEnumerable <ICashDenomination> deposits,
out IEnumerable <ICashDenomination> change, out string failureReason)
{
change = cashStore.DepositToStore(product.Cost, deposits, out string depositRejctReason);
if (!string.IsNullOrEmpty(depositRejctReason))
{
failureReason = $"Unable to deposit cash: {depositRejctReason}";
return(false);
}
//try to withdraw the product
if (!productCatalogue.WithdrawProduct(product, out string withdrawFailReason))
{
failureReason = $"Unable to withdraw item: {withdrawFailReason}";
change = deposits;
return(false);
}
failureReason = string.Empty;
return(true);
}
