add use case and request

app/Node/UseCases/BulkCreateNodes.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Node\UseCases;
+
+use App\Node\CreateNodeDto;
+use App\Node\Node;
+use App\Node\NodeRepository;
+use App\Text\TextRepository;
+use DomainException;
+
+class BulkCreateNodes
+{
+    public function __construct(
+        private NodeRepository $nodeRepo,
+        private TextRepository $textRepo,
+    ) {}
+
+    /**
+     * @return Node[]
+     * @throws DomainException
+     */
+    public function execute(BulkCreateNodesRequest $request): array
+    {
+        $text = $this->textRepo->find($request->textId);
+        if ($text === null) {
+            throw new DomainException("Text with id: {$request->textId} doesnt exist");
+        }
+
+        $parentNode = $this->nodeRepo->find($request->parentNodeId);
+        if ($parentNode === null) {
+            throw new DomainException("Node with id: {$request->parentNodeId} doesnt exist");
+        }
+
+        $created = [];
+        for ($i = 1; $i <= $request->count; $i++) {
+            $created[] = $this->nodeRepo->create(new CreateNodeDto(
+                text: $text,
+                title: "{$request->titlePrefix} {$i}",
+                parentNode: $parentNode,
+            ));
+        }
+
+        return $created;
+    }
+}