wip: booking process, refactor participant room assignment logic

src/Form/Service/ParticipantRoomChoiceLoaderFactory.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Form\Service;
+
+use App\Form\ChoiceLoader\ParticipantRoomChoiceLoader;
+use App\Form\DataAdapters\ParticipantDataAdapter;
+use Symfony\Component\Form\ChoiceList\Factory\ChoiceListFactoryInterface;
+
+/**
+ * Factory service for creating ParticipantRoomChoiceLoader instances.
+ *
+ * This service provides a clean way to create choice loaders with proper
+ * dependency injection instead of manually instantiating factories in form types.
+ */
+class ParticipantRoomChoiceLoaderFactory
+{
+    public function __construct(
+        private readonly ChoiceListFactoryInterface $choiceListFactory,
+    ) {
+    }
+
+    /**
+     * Creates a ParticipantRoomChoiceLoader for the given participant and room data.
+     */
+    public function createChoiceLoader(
+        ParticipantDataAdapter $adapter,
+        array $selectedRooms,
+        int $participantIndex,
+    ): ParticipantRoomChoiceLoader {
+        return new ParticipantRoomChoiceLoader(
+            $this->choiceListFactory,
+            $adapter,
+            $selectedRooms,
+            $participantIndex
+        );
+    }
+}