add Subscribe Discount

internal/application/product/subscription_application_service_impl.go

@@ -3,6 +3,7 @@ package product
 import (
 	"context"
 
+	"github.com/shopspring/decimal"
 	"go.uber.org/zap"
 
 	"tyapi-server/internal/application/product/dto/commands"
@@ -41,6 +42,54 @@ func (s *SubscriptionApplicationServiceImpl) UpdateSubscriptionPrice(ctx context
 	return s.productSubscriptionService.UpdateSubscriptionPrice(ctx, cmd.ID, cmd.Price)
 }
 
+// BatchUpdateSubscriptionPrices 一键改价
+// 业务流程：1. 获取用户所有订阅 2. 根据范围筛选 3. 批量更新价格
+func (s *SubscriptionApplicationServiceImpl) BatchUpdateSubscriptionPrices(ctx context.Context, cmd *commands.BatchUpdateSubscriptionPricesCommand) error {
+	subscriptions, _, err := s.productSubscriptionService.ListSubscriptions(ctx, &repoQueries.ListSubscriptionsQuery{
+		UserID:   cmd.UserID,
+		Page:     1,
+		PageSize: 1000,
+	})
+	if err != nil {
+		return err
+	}
+
+	// 根据范围筛选订阅
+	var targetSubscriptions []*entities.Subscription
+	for _, sub := range subscriptions {
+		if cmd.Scope == "all" {
+			// 所有订阅都修改
+			targetSubscriptions = append(targetSubscriptions, sub)
+		} else if cmd.Scope == "undiscounted" {
+			// 只修改未打折的订阅（价格等于产品原价）
+			if sub.Product != nil && sub.Price.Equal(sub.Product.Price) {
+				targetSubscriptions = append(targetSubscriptions, sub)
+			}
+		}
+	}
+
+	// 批量更新价格
+	for _, sub := range targetSubscriptions {
+		if sub.Product != nil {
+			// 计算折扣后的价格
+			discountRatio := cmd.Discount / 10
+			newPrice := sub.Product.Price.Mul(decimal.NewFromFloat(discountRatio))
+			// 四舍五入到2位小数
+			newPrice = newPrice.Round(2)
+
+			err := s.productSubscriptionService.UpdateSubscriptionPrice(ctx, sub.ID, newPrice.InexactFloat64())
+			if err != nil {
+				s.logger.Error("批量更新订阅价格失败",
+					zap.String("subscription_id", sub.ID),
+					zap.Error(err))
+				// 继续处理其他订阅，不中断整个流程
+			}
+		}
+	}
+
+	return nil
+}
+
 // CreateSubscription 创建订阅
 // 业务流程：1. 创建订阅
 func (s *SubscriptionApplicationServiceImpl) CreateSubscription(ctx context.Context, cmd *commands.CreateSubscriptionCommand) error {
@@ -161,9 +210,9 @@ func (s *SubscriptionApplicationServiceImpl) GetSubscriptionUsage(ctx context.Co
 	}
 
 	return &responses.SubscriptionUsageResponse{
-		ID:      subscription.ID,
+		ID:        subscription.ID,
 		ProductID: subscription.ProductID,
-		APIUsed: subscription.APIUsed,
+		APIUsed:   subscription.APIUsed,
 	}, nil
 }
 
@@ -174,7 +223,7 @@ func (s *SubscriptionApplicationServiceImpl) GetSubscriptionStats(ctx context.Co
 	if err != nil {
 		return nil, err
 	}
-	
+
 	return &responses.SubscriptionStatsResponse{
 		TotalSubscriptions: stats["total_subscriptions"].(int64),
 		TotalRevenue:       stats["total_revenue"].(float64),
@@ -188,7 +237,7 @@ func (s *SubscriptionApplicationServiceImpl) GetMySubscriptionStats(ctx context.
 	if err != nil {
 		return nil, err
 	}
-	
+
 	return &responses.SubscriptionStatsResponse{
 		TotalSubscriptions: stats["total_subscriptions"].(int64),
 		TotalRevenue:       stats["total_revenue"].(float64),
@@ -256,7 +305,7 @@ func (s *SubscriptionApplicationServiceImpl) convertToCategorySimpleResponse(cat
 	if category == nil {
 		return nil
 	}
-	
+
 	return &responses.CategorySimpleResponse{
 		ID:   category.ID,
 		Name: category.Name,