public decimal Calculate(IBasket basket)
{
var scannedItems = new List <string>();
decimal total = 0;
for (var item = basket.Take(); item != null; item = basket.Take())
{
total += CalculateItem(item);
scannedItems.Add(item);
}
var discounts = _offersService.GetAllDiscounts(scannedItems, _itemCatalogue);
return(total + discounts);
}
