wip: major refactoring

src/Form/Service/Trait/FormTraversalTrait.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service\Trait;
+
+use App\Form\Model\BookingDtoInterface;
+use Symfony\Component\Form\FormInterface;
+
+/**
+ * Trait providing form tree traversal utilities.
+ *
+ * This trait contains common form navigation logic used across different
+ * form services and types. It centralizes the logic for finding root forms
+ * and extracting booking DTOs from form hierarchies.
+ */
+trait FormTraversalTrait
+{
+    /**
+     * Gets the BookingDtoInterface from the root of the form tree.
+     *
+     * This helper method traverses up the form tree to find the root form
+     * and extracts the BookingDtoInterface data. This is shared logic used
+     * by both create and edit participant forms.
+     *
+     * @param FormInterface $form The form to start traversing from
+     *
+     * @return BookingDtoInterface|null The booking DTO or null if not found
+     */
+    public function getBookingDtoFromForm(FormInterface $form): ?BookingDtoInterface
+    {
+        // Traverse up the form tree to get the root form's data
+        $rootForm = $form;
+        while ($rootForm->getParent()) {
+            $rootForm = $rootForm->getParent();
+        }
+
+        $data = $rootForm->getData();
+
+        return $data instanceof BookingDtoInterface ? $data : null;
+    }
+}