Introduce IOrderLinePriceOverrider

modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Application/EasyAbp/EShop/Orders/Orders/IOrderLinePriceOverrider.cs

@@ -0,0 +1,11 @@
+using System.Threading.Tasks;
+using EasyAbp.EShop.Orders.Orders.Dtos;
+using EasyAbp.EShop.Products.Products.Dtos;
+
+namespace EasyAbp.EShop.Orders.Orders;
+
+public interface IOrderLinePriceOverrider
+{
+    Task<decimal?> GetUnitPriceOrNullAsync(CreateOrderDto input, CreateOrderLineDto inputOrderLine, ProductDto product,
+        ProductSkuDto productSku);
+}

modules/EasyAbp.EShop.Orders/src/EasyAbp.EShop.Orders.Application/EasyAbp/EShop/Orders/Orders/NewOrderGenerator.cs

@@ -23,6 +23,7 @@ namespace EasyAbp.EShop.Orders.Orders
         private readonly IServiceProvider _serviceProvider;
         private readonly IOrderNumberGenerator _orderNumberGenerator;
         private readonly IProductSkuDescriptionProvider _productSkuDescriptionProvider;
+        private readonly IEnumerable<IOrderLinePriceOverrider> _orderLinePriceOverriders;
 
         public NewOrderGenerator(
             IClock clock,
@@ -30,7 +31,8 @@ namespace EasyAbp.EShop.Orders.Orders
             ICurrentTenant currentTenant,
             IServiceProvider serviceProvider,
             IOrderNumberGenerator orderNumberGenerator,
-            IProductSkuDescriptionProvider productSkuDescriptionProvider)
+            IProductSkuDescriptionProvider productSkuDescriptionProvider,
+            IEnumerable<IOrderLinePriceOverrider> orderLinePriceOverriders)
         {
             _clock = clock;
             _guidGenerator = guidGenerator;
@@ -38,6 +40,7 @@ namespace EasyAbp.EShop.Orders.Orders
             _serviceProvider = serviceProvider;
             _orderNumberGenerator = orderNumberGenerator;
             _productSkuDescriptionProvider = productSkuDescriptionProvider;
+            _orderLinePriceOverriders = orderLinePriceOverriders;
         }
 
         public virtual async Task<Order> GenerateAsync(Guid customerUserId, CreateOrderDto input,
@@ -119,8 +122,10 @@ namespace EasyAbp.EShop.Orders.Orders
             {
                 throw new OrderLineInvalidQuantityException(product.Id, productSku.Id, inputOrderLine.Quantity);
             }
+
+            var unitPrice = await GetUnitPriceAsync(input, inputOrderLine, product, productSku);
             
-            var totalPrice = productSku.Price * inputOrderLine.Quantity;
+            var totalPrice = unitPrice * inputOrderLine.Quantity;
 
             var orderLine = new OrderLine(
                 id: _guidGenerator.Create(),
@@ -137,7 +142,7 @@ namespace EasyAbp.EShop.Orders.Orders
                 skuDescription: await _productSkuDescriptionProvider.GenerateAsync(product, productSku),
                 mediaResources: product.MediaResources,
                 currency: productSku.Currency,
-                unitPrice: productSku.Price,
+                unitPrice: unitPrice,
                 totalPrice: totalPrice,
                 totalDiscount: 0,
                 actualTotalPrice: totalPrice,
@@ -149,6 +154,23 @@ namespace EasyAbp.EShop.Orders.Orders
             return orderLine;
         }
 
+        protected virtual async Task<decimal> GetUnitPriceAsync(CreateOrderDto input, CreateOrderLineDto inputOrderLine,
+            ProductDto product, ProductSkuDto productSku)
+        {
+            foreach (var overrider in _orderLinePriceOverriders)
+            {
+                var overridenUnitPrice =
+                    await overrider.GetUnitPriceOrNullAsync(input, inputOrderLine, product, productSku);
+
+                if (overridenUnitPrice is not null)
+                {
+                    return overridenUnitPrice.Value;
+                }
+            }
+
+            return productSku.Price;
+        }
+
         protected virtual Task<string> GetStoreCurrencyAsync(Guid storeId)
         {
             // Todo: Get real store currency configuration.

modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Application.Tests/Orders/OrderAppServiceTests.cs

@@ -292,7 +292,7 @@ namespace EasyAbp.EShop.Orders.Orders
             });
         }
 
-                [Fact]
+        [Fact]
         public async Task Paid_Order_Should_Not_Be_Auto_Canceled_When_Payment_Overtime()
         {
             // Arrange
@@ -462,5 +462,41 @@ namespace EasyAbp.EShop.Orders.Orders
                 order.CancellationReason.ShouldBe(OrdersConsts.CancellationReason);
             });
         }
+
+        [Fact]
+        public async Task Should_Override_Unit_Price()
+        {
+            var createOrderDto = new CreateOrderDto
+            {
+                CustomerRemark = "customer remark",
+                StoreId = OrderTestData.Store1Id,
+                OrderLines = new List<CreateOrderLineDto>
+                {
+                    new()
+                    {
+                        ProductId = OrderTestData.Product1Id,
+                        ProductSkuId = OrderTestData.ProductSku1Id,
+                        Quantity = 10
+                    },
+                    new()
+                    {
+                        ProductId = OrderTestData.Product1Id,
+                        ProductSkuId = OrderTestData.ProductSku2Id,
+                        Quantity = 2
+                    }
+                }
+            };
+            
+            await WithUnitOfWorkAsync(async () =>
+            {
+                var order = await _orderAppService.CreateAsync(createOrderDto);
+                var orderLine = order.OrderLines.Find(x => x.ProductSkuId == OrderTestData.ProductSku2Id);
+                
+                order.ProductTotalPrice.ShouldBe(10 * 1m + 2 * TestOrderLinePriceOverrider.Sku2UnitPrice);
+                orderLine.ShouldNotBeNull();
+                orderLine.UnitPrice.ShouldBe(TestOrderLinePriceOverrider.Sku2UnitPrice);
+                orderLine.TotalPrice.ShouldBe(orderLine.Quantity * orderLine.UnitPrice);
+            });
+        }
     }
 }

modules/EasyAbp.EShop.Orders/test/EasyAbp.EShop.Orders.Application.Tests/Orders/TestOrderLinePriceOverrider.cs

@@ -0,0 +1,22 @@
+using System.Threading.Tasks;
+using EasyAbp.EShop.Orders.Orders.Dtos;
+using EasyAbp.EShop.Products.Products.Dtos;
+using Volo.Abp.DependencyInjection;
+
+namespace EasyAbp.EShop.Orders.Orders;
+
+public class TestOrderLinePriceOverrider : IOrderLinePriceOverrider, ITransientDependency
+{
+    public static decimal Sku2UnitPrice { get; set; } = 100m;
+    
+    public async Task<decimal?> GetUnitPriceOrNullAsync(CreateOrderDto input, CreateOrderLineDto inputOrderLine,
+        ProductDto product, ProductSkuDto productSku)
+    {
+        if (inputOrderLine.ProductSkuId == OrderTestData.ProductSku2Id)
+        {
+            return Sku2UnitPrice;
+        }
+
+        return null;
+    }
+}