订单总价和订单明细单价在代购/成本价场景会不一致，已改为同一套价格来源并支持多套餐求和

internal/service/order/service.go

@@ -207,10 +207,20 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 		seriesID = validationResult.Device.SeriesID
 	}
 
+	// 先按零售价构建明细价格快照，后续在代购/成本价场景覆盖
+	sellerShopIDValue := uint(0)
+	if resourceShopID != nil {
+		sellerShopIDValue = *resourceShopID
+	}
+	itemUnitPriceMap, retailTotalAmount, err := s.buildRetailPriceMap(ctx, validationResult.Packages, sellerShopIDValue)
+	if err != nil {
+		return nil, err
+	}
+
 	// 初始化订单字段
 	orderBuyerType := buyerType
 	orderBuyerID := buyerID
-	totalAmount := validationResult.TotalPrice
+	totalAmount := retailTotalAmount
 	paymentMethod := req.PaymentMethod
 	paymentStatus := model.PaymentStatusPaid
 	var paidAt *time.Time
@@ -244,18 +254,19 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 			actualPaidAmount = nil
 		} else {
 			// ==== 子场景 1.2：平台代购（资源属于代理商，平台代为购买）====
-			purchaseBuyerID, buyerCostPrice, purchasePaidAt, err := s.resolvePurchaseOnBehalfInfo(ctx, validationResult)
+			purchaseBuyerID, buyerCostPriceMap, buyerTotalCost, purchasePaidAt, err := s.resolvePurchaseOnBehalfInfo(ctx, validationResult)
 			if err != nil {
 				return nil, err
 			}
 			orderBuyerType = model.BuyerTypeAgent
 			orderBuyerID = purchaseBuyerID
-			totalAmount = buyerCostPrice
+			itemUnitPriceMap = buyerCostPriceMap
+			totalAmount = buyerTotalCost
 			paymentMethod = model.PaymentMethodOffline
 			paymentStatus = model.PaymentStatusPaid
 			paidAt = purchasePaidAt
 			isPurchaseOnBehalf = true
-			sellerCostPrice = buyerCostPrice
+			sellerCostPrice = buyerTotalCost
 
 			// 设置操作者信息（平台代购）
 			operatorID = nil
@@ -277,22 +288,17 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 			return nil, errors.New(errors.CodeInternalError, "资源店铺ID为空")
 		}
 
-		// 获取第一个套餐ID用于查询成本价
-		if len(validationResult.Packages) == 0 {
-			return nil, errors.New(errors.CodeInternalError, "套餐列表为空")
-		}
-		firstPackageID := validationResult.Packages[0].ID
-
 		if *resourceShopID == operatorShopID {
 			// ==== 子场景 2.1：代理自购 ====
-			costPrice, err := s.getCostPrice(ctx, operatorShopID, firstPackageID)
+			operatorCostPriceMap, operatorTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, operatorShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			orderBuyerType = model.BuyerTypeAgent
 			orderBuyerID = operatorShopID
-			totalAmount = costPrice
+			itemUnitPriceMap = operatorCostPriceMap
+			totalAmount = operatorTotalCost
 			paymentMethod = model.PaymentMethodWallet
 			paymentStatus = model.PaymentStatusPaid
 			paidAt = &now
@@ -300,28 +306,29 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 
 			operatorID = &operatorShopID
 			operatorType = "agent"
-			actualPaidAmountVal := costPrice
+			actualPaidAmountVal := operatorTotalCost
 			actualPaidAmount = &actualPaidAmountVal
 			purchaseRole = model.PurchaseRoleSelfPurchase
-			sellerCostPrice = costPrice
+			sellerCostPrice = operatorTotalCost
 
 		} else {
 			// ==== 子场景 2.2：代理代购（给下级购买）====
 			// 获取买家成本价
-			buyerCostPrice, err := s.getCostPrice(ctx, *resourceShopID, firstPackageID)
+			buyerCostPriceMap, buyerTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, *resourceShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			// 获取操作者成本价
-			operatorCostPrice, err := s.getCostPrice(ctx, operatorShopID, firstPackageID)
+			_, operatorTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, operatorShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			orderBuyerType = model.BuyerTypeAgent
 			orderBuyerID = *resourceShopID
-			totalAmount = buyerCostPrice
+			itemUnitPriceMap = buyerCostPriceMap
+			totalAmount = buyerTotalCost
 			paymentMethod = model.PaymentMethodWallet
 			paymentStatus = model.PaymentStatusPaid
 			paidAt = &now
@@ -329,10 +336,11 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 
 			operatorID = &operatorShopID
 			operatorType = "agent"
-			actualPaidAmount = &operatorCostPrice
+			actualPaidAmountVal := operatorTotalCost
+			actualPaidAmount = &actualPaidAmountVal
 			purchaseRole = model.PurchaseRolePurchaseForSubordinate
 			// 代理代购下级时，佣金差额基准应是操作方（代理自己）的成本价，而非下级的成本价
-			sellerCostPrice = operatorCostPrice
+			sellerCostPrice = operatorTotalCost
 		}
 	} else {
 		// 兜底检查：后台不支持其他支付方式（DTO 验证已拒绝，此为防御性编程）
@@ -407,7 +415,7 @@ func (s *Service) CreateAdminOrder(ctx context.Context, req *dto.CreateAdminOrde
 		order.BuyerPhone, order.BuyerNickname = s.fetchBuyerSnapshot(ctx, orderBuyerID)
 	}
 
-	items := s.buildOrderItems(userID, validationResult.Packages)
+	items := s.buildOrderItems(userID, validationResult.Packages, itemUnitPriceMap)
 
 	idempotencyKey := buildOrderIdempotencyKey(buyerType, buyerID, orderType, carrierType, carrierID, req.PackageIDs)
 
@@ -502,10 +510,20 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 		seriesID = validationResult.Device.SeriesID
 	}
 
+	// 先按零售价构建明细价格快照，后续在代购/成本价场景覆盖
+	sellerShopIDValue := uint(0)
+	if resourceShopID != nil {
+		sellerShopIDValue = *resourceShopID
+	}
+	itemUnitPriceMap, retailTotalAmount, err := s.buildRetailPriceMap(ctx, validationResult.Packages, sellerShopIDValue)
+	if err != nil {
+		return nil, err
+	}
+
 	// 初始化订单字段
 	orderBuyerType := buyerType
 	orderBuyerID := buyerID
-	totalAmount := validationResult.TotalPrice
+	totalAmount := retailTotalAmount
 	paymentMethod := req.PaymentMethod
 	paymentStatus := model.PaymentStatusPending
 	var paidAt *time.Time
@@ -522,18 +540,19 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 	// 场景判断：offline（平台代购）、wallet（代理钱包支付）、其他（待支付）
 	if req.PaymentMethod == model.PaymentMethodOffline {
 		// ==== 场景 1：平台代购（offline）====
-		purchaseBuyerID, buyerCostPrice, purchasePaidAt, err := s.resolvePurchaseOnBehalfInfo(ctx, validationResult)
+		purchaseBuyerID, buyerCostPriceMap, buyerTotalCost, purchasePaidAt, err := s.resolvePurchaseOnBehalfInfo(ctx, validationResult)
 		if err != nil {
 			return nil, err
 		}
 		orderBuyerType = model.BuyerTypeAgent
 		orderBuyerID = purchaseBuyerID
-		totalAmount = buyerCostPrice
+		itemUnitPriceMap = buyerCostPriceMap
+		totalAmount = buyerTotalCost
 		paymentMethod = model.PaymentMethodOffline
 		paymentStatus = model.PaymentStatusPaid
 		paidAt = purchasePaidAt
 		isPurchaseOnBehalf = true
-		sellerCostPrice = buyerCostPrice
+		sellerCostPrice = buyerTotalCost
 
 		// 设置操作者信息（平台代购）
 		operatorID = nil
@@ -554,22 +573,17 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 			return nil, errors.New(errors.CodeInternalError, "资源店铺ID为空")
 		}
 
-		// 获取第一个套餐ID用于查询成本价
-		if len(validationResult.Packages) == 0 {
-			return nil, errors.New(errors.CodeInternalError, "套餐列表为空")
-		}
-		firstPackageID := validationResult.Packages[0].ID
-
 		if *resourceShopID == operatorShopID {
 			// ==== 子场景 2.1：代理自购 ====
-			costPrice, err := s.getCostPrice(ctx, operatorShopID, firstPackageID)
+			operatorCostPriceMap, operatorTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, operatorShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			orderBuyerType = model.BuyerTypeAgent
 			orderBuyerID = operatorShopID
-			totalAmount = costPrice
+			itemUnitPriceMap = operatorCostPriceMap
+			totalAmount = operatorTotalCost
 			paymentMethod = model.PaymentMethodWallet
 			paymentStatus = model.PaymentStatusPaid
 			paidAt = &now
@@ -577,28 +591,29 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 
 			operatorID = &operatorShopID
 			operatorType = "agent"
-			actualPaidAmountVal := costPrice
+			actualPaidAmountVal := operatorTotalCost
 			actualPaidAmount = &actualPaidAmountVal
 			purchaseRole = model.PurchaseRoleSelfPurchase
-			sellerCostPrice = costPrice
+			sellerCostPrice = operatorTotalCost
 
 		} else {
 			// ==== 子场景 2.2：代理代购（给下级购买）====
 			// 获取买家成本价
-			buyerCostPrice, err := s.getCostPrice(ctx, *resourceShopID, firstPackageID)
+			buyerCostPriceMap, buyerTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, *resourceShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			// 获取操作者成本价
-			operatorCostPrice, err := s.getCostPrice(ctx, operatorShopID, firstPackageID)
+			_, operatorTotalCost, err := s.buildCostPriceMap(ctx, validationResult.Packages, operatorShopID)
 			if err != nil {
 				return nil, err
 			}
 
 			orderBuyerType = model.BuyerTypeAgent
 			orderBuyerID = *resourceShopID
-			totalAmount = buyerCostPrice
+			itemUnitPriceMap = buyerCostPriceMap
+			totalAmount = buyerTotalCost
 			paymentMethod = model.PaymentMethodWallet
 			paymentStatus = model.PaymentStatusPaid
 			paidAt = &now
@@ -606,10 +621,11 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 
 			operatorID = &operatorShopID
 			operatorType = "agent"
-			actualPaidAmount = &operatorCostPrice
+			actualPaidAmountVal := operatorTotalCost
+			actualPaidAmount = &actualPaidAmountVal
 			purchaseRole = model.PurchaseRolePurchaseForSubordinate
 			// 代理代购下级时，佣金差额基准应是操作方（代理自己）的成本价，而非下级的成本价
-			sellerCostPrice = operatorCostPrice
+			sellerCostPrice = operatorTotalCost
 		}
 	}
 
@@ -659,7 +675,7 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 		PaymentConfigID:         h5PaymentConfigID,
 	}
 
-	items := s.buildOrderItems(userID, validationResult.Packages)
+	items := s.buildOrderItems(userID, validationResult.Packages, itemUnitPriceMap)
 
 	idempotencyKey := buildOrderIdempotencyKey(buyerType, buyerID, req.OrderType, carrierType, carrierID, req.PackageIDs)
 
@@ -700,7 +716,7 @@ func (s *Service) CreateH5Order(ctx context.Context, req *dto.CreateOrderRequest
 	}
 }
 
-func (s *Service) resolvePurchaseOnBehalfInfo(ctx context.Context, result *purchase_validation.PurchaseValidationResult) (uint, int64, *time.Time, error) {
+func (s *Service) resolvePurchaseOnBehalfInfo(ctx context.Context, result *purchase_validation.PurchaseValidationResult) (uint, map[uint]int64, int64, *time.Time, error) {
 	var resourceShopID *uint
 	var seriesID *uint
 
@@ -713,30 +729,38 @@ func (s *Service) resolvePurchaseOnBehalfInfo(ctx context.Context, result *purch
 	}
 
 	if resourceShopID == nil || *resourceShopID == 0 {
-		return 0, 0, nil, errors.New(errors.CodeInvalidParam, "资源未分配给代理商，无法代购")
+		return 0, nil, 0, nil, errors.New(errors.CodeInvalidParam, "资源未分配给代理商，无法代购")
 	}
 
 	if seriesID == nil || *seriesID == 0 {
-		return 0, 0, nil, errors.New(errors.CodeInvalidParam, "资源未关联套餐系列")
+		return 0, nil, 0, nil, errors.New(errors.CodeInvalidParam, "资源未关联套餐系列")
 	}
 
 	if len(result.Packages) == 0 {
-		return 0, 0, nil, errors.New(errors.CodeInvalidParam, "订单中没有套餐")
+		return 0, nil, 0, nil, errors.New(errors.CodeInvalidParam, "订单中没有套餐")
 	}
 
-	firstPackageID := result.Packages[0].ID
+	buyerCostPriceMap, buyerTotalCost, err := s.buildCostPriceMap(ctx, result.Packages, *resourceShopID)
-	buyerAllocation, err := s.shopPackageAllocationStore.GetByShopAndPackage(ctx, *resourceShopID, firstPackageID)
 	if err != nil {
-		return 0, 0, nil, errors.New(errors.CodeInvalidParam, "买家没有该套餐的分配配置")
+		return 0, nil, 0, nil, err
 	}
 
 	now := time.Now()
-	return *resourceShopID, buyerAllocation.CostPrice, &now, nil
+	return *resourceShopID, buyerCostPriceMap, buyerTotalCost, &now, nil
 }
 
-func (s *Service) buildOrderItems(operatorID uint, packages []*model.Package) []*model.OrderItem {
+func (s *Service) buildOrderItems(operatorID uint, packages []*model.Package, unitPriceMap map[uint]int64) []*model.OrderItem {
 	items := make([]*model.OrderItem, 0, len(packages))
 	for _, pkg := range packages {
+		if pkg == nil {
+			continue
+		}
+
+		unitPrice := pkg.SuggestedRetailPrice
+		if price, ok := unitPriceMap[pkg.ID]; ok {
+			unitPrice = price
+		}
+
 		item := &model.OrderItem{
 			BaseModel: model.BaseModel{
 				Creator: operatorID,
@@ -746,8 +770,8 @@ func (s *Service) buildOrderItems(operatorID uint, packages []*model.Package) []
 			PackageName: pkg.PackageName,
 			PackageType: &pkg.PackageType,
 			Quantity:    1,
-			UnitPrice:   pkg.SuggestedRetailPrice,
+			UnitPrice:   unitPrice,
-			Amount:      pkg.SuggestedRetailPrice,
+			Amount:      unitPrice,
 		}
 		items = append(items, item)
 	}
@@ -755,6 +779,49 @@ func (s *Service) buildOrderItems(operatorID uint, packages []*model.Package) []
 	return items
 }
 
+// buildRetailPriceMap 构建订单明细零售价映射和总价（分）
+// sellerShopID > 0 时取代理分配零售价，=0 时取套餐建议零售价
+func (s *Service) buildRetailPriceMap(ctx context.Context, packages []*model.Package, sellerShopID uint) (map[uint]int64, int64, error) {
+	priceMap := make(map[uint]int64, len(packages))
+	var total int64
+
+	for _, pkg := range packages {
+		if pkg == nil {
+			continue
+		}
+
+		price, err := s.purchaseValidationService.GetPurchasePrice(ctx, pkg, sellerShopID)
+		if err != nil {
+			return nil, 0, err
+		}
+		priceMap[pkg.ID] = price
+		total += price
+	}
+
+	return priceMap, total, nil
+}
+
+// buildCostPriceMap 构建订单明细成本价映射和总价（分）
+func (s *Service) buildCostPriceMap(ctx context.Context, packages []*model.Package, shopID uint) (map[uint]int64, int64, error) {
+	priceMap := make(map[uint]int64, len(packages))
+	var total int64
+
+	for _, pkg := range packages {
+		if pkg == nil {
+			continue
+		}
+
+		costPrice, err := s.getCostPrice(ctx, shopID, pkg.ID)
+		if err != nil {
+			return nil, 0, err
+		}
+		priceMap[pkg.ID] = costPrice
+		total += costPrice
+	}
+
+	return priceMap, total, nil
+}
+
 func (s *Service) fetchBuyerSnapshot(ctx context.Context, customerID uint) (phone, nickname *string) {
 	if customerID == 0 {
 		return nil, nil