feat: edit selected accommodation of bookings in draft

src/Service/AccommodationBookingService.php

@@ -530,6 +530,35 @@ class AccommodationBookingService
         $this->sendCustomerConfirmationEmail($booking);
     }
 
+    /**
+     * Moves a draft to another Gruppenhaus, for the case where the wrong one was picked at
+     * creation. The chosen Verpflegung and Zusatzleistungen belong to the old house's catalog —
+     * they carry its prices and its ids — so they are dropped rather than guessed at; the office
+     * picks them again from the new catalog on the edit page.
+     * Restricted to Entwurf: anything further along may already be in front of the customer via
+     * their access link, and swapping the house underneath them would rewrite what they were
+     * offered.
+     * Idempotent — a no-op for a booking that is not a draft or already sits at $accommodation.
+     */
+    public function changeAccommodation(AccommodationBooking $booking, Accommodation $accommodation): void
+    {
+        if (!$booking->isDraft() || $booking->getAccommodation() === $accommodation) {
+            return;
+        }
+
+        $booking->setAccommodation($accommodation);
+
+        $booking->setBoardServiceLabel(null);
+        $booking->setBoardServicePrice(null);
+        $booking->setBoardServiceOriginalId(null);
+        $booking->setAdditionalServices([]);
+
+        // Clears the snapshot by itself when the new house has no price for the booked range.
+        $this->refreshPriceSnapshot($booking);
+
+        $this->entityManager->flush();
+    }
+
     /**
      * Closes a booking that is not going to happen. Deliberately silent: the office tells
      * the customer itself, so this only records the outcome.