feat: prevent booking flow without available rooms

src/Controller/Booking/CreateStep1Controller.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Controller\Booking;
 
+use App\Exception\NoRoomsAvailableException;
 use App\Form\BookingCreateStep1Type;
 use App\Service\BookingService;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -32,7 +33,13 @@ class CreateStep1Controller extends AbstractController
     #[Route('/bookings/create', name: 'app_booking_create_step_1')]
     public function index(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.');
+        }
 
         // Get or create baseline snapshot for change detection
         $oldRoomSelectionSnapshot = $this->bookingService->getOrCreateBaselineSnapshot($request, $bookingCreateDto);
@@ -83,7 +90,12 @@ class CreateStep1Controller extends AbstractController
     #[Route('/bookings/create/room-summary', name: 'app_booking_create_step_1_room_summary', methods: ['POST'])]
     public function roomSummary(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);
+        }
 
         // Process the form to update the DTO with the latest room selection
         $form = $this->createForm(BookingCreateStep1Type::class, $bookingCreateDto, [