public decimal CalculateTotal(ICoupon coupon, Dictionary <string, IOffer> currentOffers)
{
var total = Products.Sum(kv =>
{
var product = kv.Value.Product;
var quantity = kv.Value.Quantity;
if (currentOffers != null && currentOffers.ContainsKey(product.Name))
{
return(currentOffers[product.Name].ApplyOffer(product, quantity));
}
return(product.Price * quantity);
});
if (coupon != null)
{
return(coupon.ApplyDiscount(total));
}
return(total);
}
