public Kart Scan(Kart kart, Sku sku, int items)
{
var skuInStock = skus.Find(sku.ItemName);
var checkedOutSkuUnits = kart.GetSkuUnits(sku);
var noOfferPrice = sku.Price * items;
decimal offerPrice = 0;
bool offerApplies = false;
int existingSkuItemsInKart = 0;
kart.Cart.TryGetValue(sku, out existingSkuItemsInKart);
// Get all offers that contains current added sku
var applicableOffers = offers.Where(o => o.Condition.FirstOrDefault(su => su.Sku == sku) != null);
foreach (var offer in applicableOffers)
{
var applicableOfferExisting = offer.Condition.SingleOrDefault(su => su.Sku == sku);
// Check if adding current sku items triggers offer
if (applicableOfferExisting == null)
{
continue; // Offer does not apply
}
if (applicableOfferExisting.Units > existingSkuItemsInKart + items)
{
continue; // Offer does not applu
}
//Current added sku can trigger offer, now check other skus that make up offer
var applicableOfferOther = offer.Condition.Where(su => su.Sku != sku);
// Check other skus already in kart will trigger offer.
if (applicableOfferOther.All(o => kart.Cart.ContainsKey(o.Sku)) == false)
{
continue;
}
// Check other skus already in kart has enough items to trigger offer.
foreach (var other in applicableOfferOther)
{
if (other.Units > kart.Cart[other.Sku])
{
continue;
}
}
// Finally, we know offer applies
if (offerPrice > offer.OfferPrice)
{
offerPrice = offer.OfferPrice;
}
offerApplies = true;
}
kart.AddOrUpdate(sku, items);
if (offerApplies)
{
kart.Total += Math.Min(noOfferPrice, offerPrice);
}
else
{
kart.Total += noOfferPrice;
}
return(kart);
}
