public IEnumerable <ProductInBasket> ApplyOffer(IEnumerable <ProductInBasket> productsInBasket)
{
var totalNumberOfProducts = productsInBasket.Where(product => product.Product.Name == _productName).Select(product => product.Quantity).Sum();
var fourthMilkHasDiscount = totalNumberOfProducts / _nthItemFree;
return(OfferApplier.ApplyDiscountToProduct(productsInBasket, _productName, _discounter(fourthMilkHasDiscount)));
}
public IEnumerable <ProductInBasket> ApplyOffer(IEnumerable <ProductInBasket> productsInBasket)
{
int totalNumberOfFirstProduct = productsInBasket.Where(product => product.Product.Name == _firstProduct).Select(product => product.Quantity).Sum();
int totalNumberOfSecondProduct = productsInBasket.Where(product => product.Product.Name == _secondProduct).Select(product => product.Quantity).Sum();
int numberOfDiscountsPossible = totalNumberOfFirstProduct / 2;
int totalNumberOfDiscountsThatCanBeApplied = Math.Min(numberOfDiscountsPossible, totalNumberOfSecondProduct);
return(OfferApplier.ApplyDiscountToProduct(productsInBasket, _secondProduct, _discounter(totalNumberOfDiscountsThatCanBeApplied)));
}
