public decimal ApplyPromotionOffer(List <Products> selectedProducts)
{
decimal total = 0;
var products = ProductMaster.GetProducts();
var productOffers = PromotionOfferMaster.GetProductOffers();
var processedProducts = new List <int>();
foreach (var item in selectedProducts)
{
if (!processedProducts.Contains(item.ProductId))
{
var availableOffers = productOffers.Where(s => s.BaseProductId == item.ProductId);
if (availableOffers.Any())
{
foreach (var availableOffer in availableOffers)
{
if (availableOffer.Products.Count > 1)
{
var applicableOffer = availableOffer.Products.FirstOrDefault(s => s.ProductId == item.ProductId &&
s.Quantity <= item.Quantity);
if (applicableOffer != null)
{
var selectedProductIds = selectedProducts.Select(s => s.ProductId);
var otherOfferProducts = availableOffer.Products.Where(s => s.ProductId != item.ProductId &&
selectedProductIds.Contains(s.ProductId));
decimal comboTotal = 0;
if (otherOfferProducts.Any())
{
var noOfBaseApplicableOffers = item.Quantity / applicableOffer.Quantity;
var minAllowedOffer = noOfBaseApplicableOffers;
var flag = false;
foreach (var otherOfferProd in otherOfferProducts)
{
var otherSelectedProducts = selectedProducts.FirstOrDefault(s => s.ProductId == otherOfferProd.ProductId && s.Quantity >= otherOfferProd.Quantity);
if (otherSelectedProducts == null)
{
flag = false; break;
}
else
{
var noOfApplicableOffers = otherSelectedProducts.Quantity / otherOfferProd.Quantity;
var remainingQuantity = otherSelectedProducts.Quantity % otherOfferProd.Quantity;
if (minAllowedOffer > noOfApplicableOffers)
{
minAllowedOffer = noOfApplicableOffers;
}
remainingQuantity = otherSelectedProducts.Quantity >= otherOfferProd.Quantity * minAllowedOffer ?
otherSelectedProducts.Quantity - otherOfferProd.Quantity * minAllowedOffer
: otherSelectedProducts.Quantity;
var productDetail = products.Find(s => s.ProductId == otherOfferProd.ProductId);
var cost = remainingQuantity * productDetail.ProductPrice;
comboTotal += cost;
flag = true;
}
}
if (flag)
{
var remainingQuantity = item.Quantity >= applicableOffer.Quantity * minAllowedOffer ?
item.Quantity - applicableOffer.Quantity * minAllowedOffer
: item.Quantity;
var productDetail = products.Find(s => s.ProductId == item.ProductId);
var cost = (minAllowedOffer * availableOffer.OfferPrice) + (remainingQuantity * productDetail.ProductPrice);
comboTotal += cost;
total += comboTotal;
var processedItem = otherOfferProducts.Select(s => s.ProductId);
processedProducts.AddRange(processedItem);
processedProducts.Add(item.ProductId);
}
else
{
var productDetail = products.FirstOrDefault(s => s.ProductId == item.ProductId);
if (productDetail != null)
{
var cost = item.Quantity * productDetail.ProductPrice;
total += cost;
processedProducts.Add(item.ProductId);
}
}
}
else
{
var productDetail = products.FirstOrDefault(s => s.ProductId == item.ProductId);
if (productDetail != null)
{
var cost = item.Quantity * productDetail.ProductPrice;
total += cost;
processedProducts.Add(item.ProductId);
}
}
}
}
else
{
var applicableOffer = availableOffer.Products.FirstOrDefault(s => s.Quantity <= item.Quantity);
if (applicableOffer != null)
{
var noOfApplicableOffers = item.Quantity / applicableOffer.Quantity;
var remainingQuantity = item.Quantity % applicableOffer.Quantity;
var productDetail = products.Find(s => s.ProductId == item.ProductId);
var cost = (noOfApplicableOffers * availableOffer.OfferPrice) + (remainingQuantity * productDetail.ProductPrice);
total += cost;
}
else
{
var productDetail = products.FirstOrDefault(s => s.ProductId == item.ProductId);
if (productDetail != null)
{
var cost = item.Quantity * productDetail.ProductPrice;
total += cost;
}
}
processedProducts.Add(item.ProductId);
}
if (processedProducts.Contains(item.ProductId))
{
break;
}
}
}
else
{
var productDetail = products.FirstOrDefault(s => s.ProductId == item.ProductId);
if (productDetail != null)
{
var cost = item.Quantity * productDetail.ProductPrice;
total += cost;
processedProducts.Add(item.ProductId);
}
}
}
}
return(total);
}
