feat: refactor callback validators to dedicated class

src/Validator/Constraints/Booking.php

@@ -7,7 +7,7 @@ use Symfony\Component\Validator\Constraint;
 #[\Attribute]
 class Booking extends Constraint
 {
-    public string $message = 'WTF?';
+    public string $message = 'Bitte prüfe deine Angaben.';
 
     public function getTargets(): array|string
     {

src/Validator/Constraints/Participant.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+#[\Attribute]
+class Participant extends Constraint
+{
+    public function getTargets(): array|string
+    {
+        return static::CLASS_CONSTRAINT;
+    }
+}

src/Validator/Constraints/ParticipantValidator.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace App\Validator\Constraints;
+
+use App\Form\Model\ParticipantData;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+class ParticipantValidator extends ConstraintValidator
+{
+    public function validate(mixed $value, Constraint $constraint): void
+    {
+        /** @var ParticipantData $participant */
+        $participant = $value;
+
+        $this->assertBodyMeasurementsValid($participant);
+        $this->assertTransportationSelected($participant);
+        $this->assertPickupSelected($participant);
+    }
+
+    public function assertBodyMeasurementsValid(ParticipantData $participant): void
+    {
+        if (0 === count($participant->rentals)) {
+            return;
+        }
+
+        foreach (['height', 'shoeSize', 'weight'] as $property) {
+            if (empty($participant->{$property})) {
+                $this->context->buildViolation('Bitte angeben wegen Leihmaterial')
+                    ->atPath($property)
+                    ->addViolation()
+                ;
+            }
+        }
+    }
+
+    public function assertTransportationSelected(ParticipantData $participant): void
+    {
+        // no transportation services required for canceled participants
+        if (true === $participant->isCanceled()) {
+            return;
+        }
+
+        foreach (['transportationServiceTo', 'transportationServiceFro'] as $property) {
+            if (null === $participant->{$property}) {
+                $this->context->buildViolation('Bitte angeben')
+                    ->atPath($property)
+                    ->addViolation()
+                ;
+            }
+        }
+    }
+
+    public function assertPickupSelected(ParticipantData $participant): void
+    {
+        if (
+            null !== $participant->transportationServiceTo
+            && 'BUS' === $participant->transportationServiceTo->subType
+            && null === $participant->pickup
+        ) {
+            $this->context->buildViolation('Bitte auswählen')
+                ->atPath('pickup')
+                ->addViolation()
+            ;
+        }
+    }
+}