public void ApplyDiscount(Order order)
{
//indirimi bul uygula
DiscountCalculateItem discountCalculateItem = DiscountCalculator.CalculateAndApplyDiscount(order);
//indirmi orderDetail'a paylaştır
if (discountCalculateItem != null)
{
DiscountCalculator.CalculateAndApplyUnitDiscount(discountCalculateItem);
}
}
public override void CalculateAndApplyUnitDiscount(DiscountCalculateItem discountCalculateItem)
{
decimal unitDiscountAmount = discountCalculateItem.DiscountAmount / discountCalculateItem.TotalQuantity;
List <OrderDetail> orderDetailList = OrderDetailService.GetListByOrderIdCategoryId(discountCalculateItem.OrderId, discountCalculateItem.CategoryId);
foreach (var orderDetail in orderDetailList)
{
orderDetail.TotalDiscountAmount = orderDetail.TotalDiscountAmount + unitDiscountAmount * orderDetail.Quantity;
OrderDetailService.Update(orderDetail);
}
}
public override DiscountCalculateItem CalculateAndApplyDiscount(Order order)
{
//step1: sepette her kategoride toplam kaç ürün var
List <OrderDetail> orderDetailList = OrderDetailService.GetByOrderId(order.Id);
var orderDetailSummaryList = orderDetailList.GroupBy(p => p.CategoryId).Select(g => new
{
CategoryId = g.Key,
Quantity = g.Sum(t => t.Quantity)
});
//step2: her kategori için geçerli kampanyaları bul ve indirimi hesapla
List <DiscountCalculateItem> discountCalculateItemList = new List <DiscountCalculateItem>();
foreach (var item in orderDetailSummaryList)
{
List <Campaign> currentCampaignList = _campaignService.GetCurrentCampaignList(item.CategoryId, item.Quantity);
if (currentCampaignList.Count != 0)
{
foreach (var campaignItem in currentCampaignList)
{
DiscountCalculateItem discountCalculateItem = new DiscountCalculateItem();
discountCalculateItem.OrderId = order.Id;
discountCalculateItem.CategoryId = item.CategoryId;
discountCalculateItem.TotalQuantity = item.Quantity;
if (campaignItem.DiscountType == (int)DiscountType.RATE)
{
discountCalculateItem.DiscountAmount = (order.OriginalPrice * campaignItem.Rate) / 100;
}
else if (campaignItem.DiscountType == (int)DiscountType.AMOUNT)
{
discountCalculateItem.DiscountAmount = campaignItem.DiscountAmount;
}
discountCalculateItemList.Add(discountCalculateItem);
}
}
else
{
return(null);
}
}
//step3:Max indirim tutarlı olanı bul
var maxDiscountCampaign = discountCalculateItemList.OrderByDescending(i => i.DiscountAmount).First();
//indirimi order'a uygula
order.TotalPrice = order.TotalPrice - maxDiscountCampaign.DiscountAmount;
order.TotalCampaignAmount = maxDiscountCampaign.DiscountAmount;
OrderService.Update(order);
return(maxDiscountCampaign);
}
public abstract void CalculateAndApplyUnitDiscount(DiscountCalculateItem discountCalculateItem);
