feat: prevent booking flow without available rooms

src/Controller/Booking/CreateStep2Controller.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Controller\Booking;
 
 use App\Controller\Traits\HtmxControllerTrait;
+use App\Exception\NoRoomsAvailableException;
 use App\Form\BookingCreateStep2Type;
 use App\Form\Model\BookingCreateDto;
 use App\Form\Model\ParticipantDto;
@@ -38,9 +39,15 @@ class CreateStep2Controller extends AbstractController
     #[Route('/bookings/create/participants', name: 'app_booking_create_step_2')]
     public function participants(Request $request): Response
     {
-        $bookingCreateDto = $this
-            ->bookingService
-            ->getOrCreateBookingCreateDto($request);
+        try {
+            $bookingCreateDto = $this
+                ->bookingService
+                ->getOrCreateBookingCreateDto($request);
+        } catch (NoRoomsAvailableException $e) {
+            $this->addFlash('error', 'Leider sind für diese Reise aktuell keine Zimmer verfügbar.');
+            // TODO: Redirect to travel listing or hotel details page
+            throw $this->createNotFoundException('No rooms available for this travel.');
+        }
 
         // Enrich with fresh availability data
         $this->enrichWithFreshAvailabilities($bookingCreateDto);
@@ -93,7 +100,12 @@ class CreateStep2Controller extends AbstractController
     #[Route('/bookings/create/participants/refresh', name: 'app_booking_create_step_2_refresh', methods: ['POST'])]
     public function refreshParticipantForm(Request $request): Response
     {
-        $bookingCreateDto = $this->bookingService->getOrCreateBookingCreateDto($request);
+        try {
+            $bookingCreateDto = $this->bookingService->getOrCreateBookingCreateDto($request);
+        } catch (NoRoomsAvailableException $e) {
+            // For HTMX requests, return a simple error message
+            return new Response('<div class="text-red-700 p-4">Keine Zimmer verfügbar</div>', 400);
+        }
 
         // Enrich with fresh availability data
         $this->enrichWithFreshAvailabilities($bookingCreateDto);