wip: form refactoring

src/Form/Service/EditFieldStateProvider.php

@@ -5,10 +5,10 @@ declare(strict_types=1);
 namespace App\Form\Service;
 
 use App\Form\Model\BookingDtoInterface;
-use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
-use App\Form\ParticipantFieldHandler\Condition\MutabilityCondition;
 use App\Form\ParticipantFieldHandler\Condition\ApplicantCondition;
 use App\Form\ParticipantFieldHandler\Condition\CompositeCondition;
+use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
+use App\Form\ParticipantFieldHandler\Condition\MutabilityCondition;
 
 /**
  * Field state provider for the booking edit workflow.
@@ -21,6 +21,8 @@ use App\Form\ParticipantFieldHandler\Condition\CompositeCondition;
  */
 class EditFieldStateProvider implements FieldStateProviderInterface
 {
+    use FormTraversalTrait;
+
     /** @var array<string, array<string, FieldConditionInterface>> */
     private array $fieldStateConditions = [];
 
@@ -109,6 +111,7 @@ class EditFieldStateProvider implements FieldStateProviderInterface
         foreach ($this->fieldStateConditions[$fieldName] as $condition) {
             $dependencies = array_merge($dependencies, $condition->getDependentFields());
         }
+
         return array_unique($dependencies);
     }
 
@@ -121,6 +124,7 @@ class EditFieldStateProvider implements FieldStateProviderInterface
                 $allStates[$fieldName] = $fieldState;
             }
         }
+
         return $allStates;
     }
-} 
+}

src/Form/Service/FormTraversalTrait.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service;
+
+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;
+    }
+}

src/Form/Service/ParticipantFieldOptionsProvider.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Form\Service;
 
+use App\Form\Model\BookingCreateDto;
 use App\Form\Model\BookingDtoInterface;
 use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
 
@@ -26,6 +27,8 @@ use App\Form\ParticipantFieldHandler\Condition\FieldConditionInterface;
  */
 class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
 {
+    use FormTraversalTrait;
+
     /** @var array<string, callable> Field option providers indexed by field name */
     private array $fieldOptionProviders = [];
 
@@ -120,7 +123,7 @@ class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
      */
     private function registerFieldOptionProviders(): void
     {
-        // Room assignment field provider
+        // Room assignment field provider (only available for create workflow)
         $this->fieldOptionProviders['assignedRoomId'] = fn (BookingDtoInterface $bookingDto, int $participantIndex) => [
             'label' => 'Zimmer',
             'placeholder' => 'Bitte wählen',
@@ -128,11 +131,13 @@ class ParticipantFieldOptionsProvider implements FieldStateProviderInterface
             // - Shows only available rooms for this participant
             // - Excludes rooms already assigned to other participants
             // - Respects room capacity and booking constraints
-            'choice_loader' => $this->roomChoiceLoaderFactory->create(
-                $bookingDto->participants,
-                $bookingDto->getSelectedRooms(),
-                $participantIndex
-            ),
+            'choice_loader' => $bookingDto instanceof BookingCreateDto
+                ? $this->roomChoiceLoaderFactory->create(
+                    $bookingDto->participants,
+                    $bookingDto->getSelectedRooms(),
+                    $participantIndex
+                )
+                : null,
         ];
 
         // Future field providers would be added here, for example: