public PromoModels.PromofiedCart ApplyPromo(string id)
{
if (string.IsNullOrEmpty(id))
{
throw new Exception("Not a valid cart id");
}
CartModels.Cart cart = GetCart(id);
// assuming that promo code ids are sent in the controller request
var promoCodes = new List <string>();
var promoCollection = new List <PromoModels.Promo>();
foreach (var pc in promoCodes)
{
var promo = _promoRepo.Get(pc);
if (promo != null)
{
promoCollection.Add(promo);
}
}
// process promo code and get total price
PromoModels.PromofiedCart promofiedCart = _promoEngine.Process(promoCollection, cart);
return(promofiedCart);
}
// Implement the calculation process for promo engine
PromoModels.PromofiedCart IPromoEngine.Process(List <PromoModels.Promo> promos, CartModels.Cart cart)
{
var groupedItems = new Dictionary <string, List <PromoModels.MarkedItem> >();
foreach (var item in cart.Items)
{
if (!groupedItems.ContainsKey(item.Category))
{
groupedItems.Add(item.Category, new List <PromoModels.MarkedItem> {
new PromoModels.MarkedItem {
Item = item, MarkedBuys = new Dictionary <string, bool>(), MarkedGets = new Dictionary <string, float>()
}
});
}
else
{
groupedItems[item.Category].Add(new PromoModels.MarkedItem {
Item = item, MarkedBuys = new Dictionary <string, bool>(), MarkedGets = new Dictionary <string, float>()
});
}
}
foreach (var promo in promos)
{
groupedItems = ApplyPromo(promo, groupedItems);
}
var items = new List <PromoModels.MarkedItem>();
foreach (var item in groupedItems)
{
items.AddRange(item.Value);
}
var prices = ComputePrices(items);
var totalPrice = prices[0];
var totalOffPrice = prices[1];
PromoModels.PromofiedCart promofiedCart = new PromoModels.PromofiedCart {
Items = items, TotalPrice = totalPrice, TotalOffPrice = totalOffPrice
};
return(promofiedCart);
}
