refactor getNodes into a new NodeController and update refs

app/Node/NodeController.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Node;
+
+use App\Node\NodeRepository;
+use App\Text\TextRepository;
+use Psr\Http\Message\ResponseInterface as Response;
+
+class NodeController
+{
+    public function __construct(
+        private NodeRepository $nodeRepository,
+        private TextRepository $textRepository,
+    ) {}
+
+    public function getNodes(Response $response, int $textId): Response
+    {
+        $text = $this->textRepository->find($textId);
+
+        if ($text === null) {
+            return $response->withStatus(404);
+        }
+
+        $nodes = $this->nodeRepository->findByTextId($textId);
+
+        $data = array_map(function ($node) {
+            return [
+                'id' => $node->getId(),
+                'title' => $node->getTitle(),
+                'parentNodeId' => $node->getParentNode()?->getId(),
+            ];
+        }, $nodes);
+
+        $response->getBody()->write(json_encode(array_values($data)));
+        return $response->withHeader('Content-Type', 'application/json');
+    }
+}