fix: consider parking space availability

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -647,13 +647,24 @@ class ParticipantFieldOptionsProvider extends AbstractFieldOptionsProvider
                 return [];
             }
 
-            return [
+            $fieldOptions = [
                 'label' => $this->serviceLabelFormatter->formatServiceLabelForServices(
                     Constants::SERVICE_LABELS[Constants::TOKEN_PARKING],
                     $parkingServices
                 ),
                 'required' => false,
             ];
+
+            // There's only ever one parking type, so check readonly state against the single service
+            $parkingService = reset($parkingServices);
+            if ($this->shouldMakeServiceReadonly($parkingService, $bookingDto, $participantIndex, 'parking')) {
+                $fieldOptions['attr'] = [
+                    'readonly' => true,
+                    'data-tooltip' => 'ausgebucht',
+                ];
+            }
+
+            return $fieldOptions;
         };
 
         // Bulk insurance booking checkbox (applicant only - controls insurance assignment for all participants)

src/Form/Service/ParticipantParkingFieldHandler.php

@@ -10,6 +10,7 @@ use App\BusProNet\Utility\DirectionMapper;
 use App\Form\Model\BookingDto;
 use App\Form\Model\ParticipantDto;
 use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
+use App\Service\ServiceAvailabilityCalculator;
 
 /**
  * Handles parking service selection for self-organized transportation.
@@ -20,6 +21,11 @@ use App\Form\Service\Abstract\AbstractParticipantFieldHandler;
  */
 class ParticipantParkingFieldHandler extends AbstractParticipantFieldHandler
 {
+    public function __construct(
+        private readonly ServiceAvailabilityCalculator $serviceAvailabilityCalculator,
+    ) {
+    }
+
     public function getFieldName(): string
     {
         return 'parking';
@@ -73,7 +79,22 @@ class ParticipantParkingFieldHandler extends AbstractParticipantFieldHandler
 
         // Store parking service object for pricing calculation
         if (true === $isParkingSelected) {
-            $participant->parkingService = $this->findParkingService($bookingDto, $participantIndex);
+            $parkingService = $this->findParkingService($bookingDto, $participantIndex);
+
+            // Reject the selection if the service is sold out, in case the client
+            // bypassed the readonly UI state (e.g. a stale form or manual submission)
+            if (
+                null !== $parkingService
+                && BookingDto::MODE_EDIT !== $bookingDto->getMode()
+                && $this->serviceAvailabilityCalculator->isServiceUnavailable($parkingService->id, $bookingDto, $participantIndex)
+            ) {
+                $participant->parking = false;
+                $participant->parkingService = null;
+
+                return;
+            }
+
+            $participant->parkingService = $parkingService;
         } else {
             $participant->parkingService = null;
         }

src/Service/ServiceAvailabilityCalculator.php

@@ -173,6 +173,11 @@ class ServiceAvailabilityCalculator
             $serviceUsage[$participant->skiPass->id] = ($serviceUsage[$participant->skiPass->id] ?? 0) + 1;
         }
 
+        // Parking service (single selection)
+        if (null !== $participant->parkingService && null !== $participant->parkingService->id) {
+            $serviceUsage[$participant->parkingService->id] = ($serviceUsage[$participant->parkingService->id] ?? 0) + 1;
+        }
+
         // Transportation services (single selection each)
         if (null !== $participant->transportationOutbound && null !== $participant->transportationOutbound->id) {
             $serviceUsage[$participant->transportationOutbound->id] = ($serviceUsage[$participant->transportationOutbound->id] ?? 0) + 1;
@@ -231,6 +236,7 @@ class ServiceAvailabilityCalculator
             Constants::TOKEN_RENTALS,
             Constants::TOKEN_SKI_PASS,
             Constants::TOKEN_BOARD,
+            Constants::TOKEN_PARKING,
         ];
 
         foreach ($additionalServiceTokens as $token) {