public decimal GetAllDiscounts(IList <string> scannedItems, IItemCatalogue itemCatalogue)
{
var discounts = 0m;
foreach (var offer in _currentOffers)
{
var discountAndProportion = offer.DiscountItemAndProportion();
var timesApplicable = offer.TimesApplicable(scannedItems);
var itemPrice = itemCatalogue.LookupPrice(discountAndProportion.Item);
var priceProportion = discountAndProportion.Proportion;
discounts += itemPrice * priceProportion * timesApplicable;
}
return(-discounts);
}
public Checkout(IItemCatalogue itemCatalogue, IOffersService offersService)
{
_itemCatalogue = itemCatalogue;
_offersService = offersService;
}