routing

internal/prestashop/cart/service.go

@@ -0,0 +1,35 @@
+package cart
+
+import (
+	"context"
+	"fmt"
+
+	"gorm.io/gorm"
+)
+
+type Summary struct {
+	ID         int64
+	TotalItems int64
+}
+
+type Service struct {
+	db     *gorm.DB
+	prefix string
+}
+
+func NewService(db *gorm.DB, prefix string) *Service {
+	return &Service{db: db, prefix: prefix}
+}
+
+func (s *Service) SummaryByID(ctx context.Context, cartID int64) (*Summary, error) {
+	var summary Summary
+	query := fmt.Sprintf("SELECT id_cart AS id, COALESCE(SUM(quantity), 0) AS total_items FROM %scart_product WHERE id_cart = ? GROUP BY id_cart", s.prefix)
+	result := s.db.WithContext(ctx).Raw(query, cartID).Scan(&summary)
+	if result.Error != nil {
+		return nil, result.Error
+	}
+	if result.RowsAffected == 0 {
+		return &Summary{ID: cartID}, nil
+	}
+	return &summary, nil
+}