try to reserve when entering checkout

pkg/cart/mutation_add_item.go

@@ -4,8 +4,10 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"time"
 
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
+	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
 // mutation_add_item.go
@@ -69,9 +71,20 @@ func (c *CartMutationContext) AddItem(g *CartGrain, m *messages.AddItem) error {
 	}
 
 	pricePerItem := NewPriceFromIncVat(m.Price, taxRate)
-	endTime, err := c.ReserveItem(ctx, g.Id, m.Sku, m.StoreId, uint16(m.Quantity))
-	if err != nil {
-		return err
+
+	needsReservation := true
+	if m.ReservationEndTime != nil {
+		needsReservation = m.ReservationEndTime.AsTime().Before(time.Now())
+	}
+
+	if needsReservation {
+		endTime, err := c.ReserveItem(ctx, g.Id, m.Sku, m.StoreId, uint16(m.Quantity))
+		if err != nil {
+			return err
+		}
+		if endTime != nil {
+			m.ReservationEndTime = timestamppb.New(*endTime)
+		}
 	}
 
 	cartItem := &CartItem{
@@ -106,10 +119,12 @@ func (c *CartMutationContext) AddItem(g *CartGrain, m *messages.AddItem) error {
 		OrgPrice:    getOrgPrice(m.OrgPrice, taxRate),
 		ArticleType: m.ArticleType,
 
-		StoreId:            m.StoreId,
-		ReservationEndTime: endTime,
+		StoreId: m.StoreId,
+	}
+	if m.ReservationEndTime != nil {
+		t := m.ReservationEndTime.AsTime()
+		cartItem.ReservationEndTime = &t
 	}
-
 	g.Items = append(g.Items, cartItem)
 	g.UpdateTotals()
 	return nil