fix: validate mandatory services selection

src/Form/Model/ParticipantEditDto.php

@@ -19,6 +19,7 @@ use Symfony\Component\Validator\Context\ExecutionContextInterface;
  */
 #[AppAssert\PurchaseVoucher(groups: ['booking_create', 'booking_edit'])]
 #[AppAssert\PromoVoucher(groups: ['booking_create', 'booking_edit'])]
+#[AppAssert\MandatoryAdditionalServicesSelected(groups: ['booking_create', 'booking_edit'])]
 class ParticipantEditDto
 {
     public function __construct(

src/Validator/Constraints/MandatoryAdditionalServicesSelected.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Validates that all mandatory additional services are selected.
+ *
+ * Applied on ParticipantEditDto to enforce mandatory additional services based
+ * on participant age and booking eligibility in both create and edit flows.
+ */
+#[\Attribute]
+class MandatoryAdditionalServicesSelected extends Constraint
+{
+    public string $message = 'Bitte wähle alle Pflichtleistungen aus.';
+
+    public function getTargets(): array|string
+    {
+        return static::CLASS_CONSTRAINT;
+    }
+}
+

src/Validator/Constraints/MandatoryAdditionalServicesSelectedValidator.php

@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Validator\Constraints;
+
+use App\BusProNet\Constants;
+use App\BusProNet\Model\Service;
+use App\Form\Model\ParticipantEditDto;
+use App\Form\Service\ServiceAgeEvaluator;
+use App\Service\ParticipantEligibilityService;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * Enforces selection of age-eligible mandatory additional services.
+ */
+class MandatoryAdditionalServicesSelectedValidator extends ConstraintValidator
+{
+    public function __construct(
+        private readonly ParticipantEligibilityService $participantEligibilityService,
+        private readonly ServiceAgeEvaluator $serviceAgeEvaluator,
+    ) {
+    }
+
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        if (false === $constraint instanceof MandatoryAdditionalServicesSelected) {
+            throw new UnexpectedTypeException($constraint, MandatoryAdditionalServicesSelected::class);
+        }
+
+        if (false === $value instanceof ParticipantEditDto) {
+            throw new UnexpectedTypeException($value, ParticipantEditDto::class);
+        }
+
+        $participant = $value->participant;
+        if (true === $participant->isCanceled()) {
+            return;
+        }
+
+        $participantIndex = $participant->index ?? 0;
+        if (false === $this->participantEligibilityService->isParticipantEligible($value->bookingContext, $participantIndex)) {
+            return;
+        }
+
+        $mandatoryAdditionalServices = array_filter(
+            $value->bookingContext->travel->getAdditionalServicesBySubTypes(Constants::TOKEN_ADDITIONAL),
+            function (Service $service) use ($value, $participantIndex): bool {
+                if (true !== $service->mandatory) {
+                    return false;
+                }
+
+                if (true === $this->serviceAgeEvaluator->canEvaluate($service)) {
+                    return $this->serviceAgeEvaluator->isServiceAvailableForParticipant(
+                        $service,
+                        $value->bookingContext,
+                        $participantIndex
+                    );
+                }
+
+                return true;
+            }
+        );
+
+        if (true === empty($mandatoryAdditionalServices)) {
+            return;
+        }
+
+        $selectedAdditionalServiceIds = array_map(
+            static fn (Service $service): int => $service->id,
+            $participant->additionalServices
+        );
+
+        foreach ($mandatoryAdditionalServices as $mandatoryService) {
+            if (false === in_array($mandatoryService->id, $selectedAdditionalServiceIds, true)) {
+                $this->context->buildViolation($constraint->message)
+                    ->atPath('participant.additionalServices')
+                    ->addViolation();
+
+                return;
+            }
+        }
+    }
+}
+