add more payment related shit

pkg/cart/mutation_payment_declined.go

@@ -1,21 +1,26 @@
 package cart
 
 import (
+	"errors"
 	"time"
 
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
 )
 
+func asPointer[T any](value T) *T {
+	return &value
+}
+
+var ErrPaymentNotFound = errors.New("payment not found")
+
 func PaymentDeclined(grain *CartGrain, req *messages.PaymentDeclined) error {
-	grain.PaymentStatus = "declined"
-	grain.PaymentDeclinedNotices = append(grain.PaymentDeclinedNotices, Notice{
-		Timestamp: time.Now(),
-		Message:   req.Message,
-		Code:      req.Code,
-	})
-	// Optionally clear checkout order if in progress
-	if grain.CheckoutOrderId != "" {
-		grain.CheckoutOrderId = ""
+
+	payment, found := grain.FindPayment(req.PaymentId)
+	if !found {
+		return ErrPaymentNotFound
 	}
+
+	payment.CompletedAt = asPointer(time.Now())
+	payment.Status = PaymentStatusFailed
 	return nil
 }