feat: groups price calculator admin crud, booking/offer flow and api

src/Controller/Groups/AbstractAccommodationController.php

@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Controller\Groups;
+
+use App\Exception\AccommodationSessionNotFoundException;
+use App\Form\Model\AccommodationBookingDto;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+abstract class AbstractAccommodationController extends AbstractController
+{
+    protected function validateStepAccess(AccommodationBookingDto $dto, int $expectedStep): ?RedirectResponse
+    {
+        if ($expectedStep > $dto->currentStep) {
+            $this->addFlash('error', 'Bitte erst die vorherigen Schritte abschließen.');
+
+            return $this->redirectToCurrentStep($dto);
+        }
+
+        return null;
+    }
+
+    protected function createFailureResponse(\Throwable $exception, bool $htmx): Response
+    {
+        if ($htmx) {
+            return new Response('', 400);
+        }
+
+        $message = $exception instanceof AccommodationSessionNotFoundException
+            ? 'Deine Sitzung ist abgelaufen. Bitte starte die Anfrage erneut.'
+            : 'Die Anfrage konnte nicht geladen werden.';
+
+        $this->addFlash('error', $message);
+
+        return $this->redirectToRoute('app_groups_booking_error');
+    }
+
+    private function redirectToCurrentStep(AccommodationBookingDto $dto): RedirectResponse
+    {
+        $route = match ($dto->currentStep) {
+            2 => 'app_groups_booking_step_2',
+            3 => 'app_groups_booking_step_3',
+            4 => 'app_groups_booking_step_4',
+            default => 'app_groups_booking_step_1',
+        };
+
+        return $this->redirectToRoute($route);
+    }
+}