implement create node method in node controller

app/Node/NodeController.php

@@ -3,8 +3,12 @@
 namespace App\Node;
 
 use App\Node\NodeRepository;
+use App\Node\UseCases\CreateNode;
+use App\Node\UseCases\CreateNodeRequest;
 use App\Text\TextRepository;
+use DomainException;
 use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
 
 class NodeController
 {
@@ -34,4 +38,41 @@ class NodeController
         $response->getBody()->write(json_encode(array_values($data)));
         return $response->withHeader('Content-Type', 'application/json');
     }
+
+    public function createNode(
+        Request $request,
+        Response $response,
+        CreateNode $createNodeUseCase,
+    ): Response {
+        $data = $request->getParsedBody();
+        $title = $data['title'] ?? '';
+
+        if (empty($title)) {
+            $response->getBody()->write(json_encode(['error' => 'Title is required']));
+            return $response->withStatus(400)->withHeader('Content-Type', 'application/json');
+        }
+
+        $textId = (int) ($data['textId'] ?? 0);
+        $parentNodeId = isset($data['parentNodeId']) && $data['parentNodeId'] !== null
+            ? (int) $data['parentNodeId']
+            : null;
+
+        try {
+            $node = $createNodeUseCase->execute(new CreateNodeRequest(
+                textId: $textId,
+                title: $title,
+                parentNodeId: $parentNodeId,
+            ));
+        } catch (DomainException $e) {
+            $response->getBody()->write(json_encode(['error' => $e->getMessage()]));
+            return $response->withStatus(404)->withHeader('Content-Type', 'application/json');
+        }
+
+        $response->getBody()->write(json_encode([
+            'id' => $node->getId(),
+            'title' => $node->getTitle(),
+            'parentNodeId' => $node->getParentNode()?->getId(),
+        ]));
+        return $response->withStatus(201)->withHeader('Content-Type', 'application/json');
+    }
 }