public CalculatedCartDTO Calculate(CartRequest cart)
{
List <BoughtProduct> boughtProducts = new List <BoughtProduct>();
foreach (var cartItemRequest in cart.CartItems)
{
var promotionRules = DomainRegistry.PromotionRepository().GetListByContainsProductId(cartItemRequest.ProductId);
var boughtProduct = new BoughtProduct(cartItemRequest.ProductId, cartItemRequest.Quantity, cartItemRequest.UnitPrice, 0, promotionRules, cartItemRequest.SelectedMultiProductsPromotionId);
boughtProducts.Add(boughtProduct);
}
#region 处理单品促销
foreach (var boughtProduct in boughtProducts.ToList())
{
var calculateResult = _mergeSingleProductPromotionForOneProductDomainService.Merge(boughtProduct.ProductId, boughtProduct.DiscountedUnitPrice, boughtProduct.InSingleProductPromotionRules);
var newBoughtProduct = boughtProduct.ChangeReducePrice(calculateResult);
boughtProducts.Remove(boughtProduct);
boughtProducts.Add(newBoughtProduct);
}
#endregion
#region 处理多商品促销&构造DTO模型
List <CalculatedFullGroupDTO> fullGroupDtos = new List <CalculatedFullGroupDTO>();
foreach (var groupedPromotoinId in boughtProducts.Where(ent => ent.InMultiProductPromotionRule != null).GroupBy(ent => ((PromotionRule)ent.InMultiProductPromotionRule).PromotoinId))
{
var multiProdcutsReducePricePromotion = (IMultiProdcutsReducePricePromotion)groupedPromotoinId.First().InMultiProductPromotionRule; //暂时只有减金额的多商品促销
var products = groupedPromotoinId.ToList();
if (multiProdcutsReducePricePromotion == null)
{
continue;
}
var reducePrice = multiProdcutsReducePricePromotion.CalculateReducePrice(products);
fullGroupDtos.Add(new CalculatedFullGroupDTO
{
CalculatedCartItems = products.Select(ent => ent.ToDTO()).ToArray(),
ReducePrice = reducePrice,
MultiProductsPromotionId = groupedPromotoinId.Key
});
}
#endregion
return(new CalculatedCartDTO
{
CalculatedCartItems = boughtProducts.Where(ent => fullGroupDtos.SelectMany(e => e.CalculatedCartItems).All(e => e.ProductId != ent.ProductId))
.Select(ent => ent.ToDTO()).ToArray(),
CalculatedFullGroups = fullGroupDtos.ToArray(),
CartId = cart.CartId
});
}