feat: correct handling of vouchers

src/Form/Model/BookingDto.php

@@ -219,4 +219,52 @@ class BookingDto
                 ->addViolation();
         }
     }
+
+    /**
+     * Checks if this is an inquiry booking (status='A').
+     *
+     * Inquiry bookings occur when a travel is fully booked but still accepts inquiries.
+     */
+    public function isInquiryBooking(): bool
+    {
+        return 'A' === $this->bookingStatus;
+    }
+
+    /**
+     * Checks if any participants have entered voucher codes.
+     *
+     * @return bool True if any promotional, purchase, or goodwill vouchers are present
+     */
+    public function hasVouchers(): bool
+    {
+        foreach ($this->participants as $participant) {
+            if (null !== $participant->promoVoucherCode && '' !== trim($participant->promoVoucherCode)) {
+                return true;
+            }
+            if (null !== $participant->purchaseVoucherCode && '' !== trim($participant->purchaseVoucherCode)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Checks if any participants have entered goodwill vouchers.
+     *
+     * Goodwill vouchers (Kulanz) are a special type of purchase voucher that cannot be
+     * redeemed in inquiry bookings. This method is used to display appropriate warnings.
+     *
+     * @return bool True if any goodwill vouchers are present
+     */
+    public function hasGoodwillVouchers(): bool
+    {
+        foreach ($this->participants as $participant) {
+            if (true === $participant->hasGoodwillVoucher) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }