route set updates

backend/app/Set/UseCases/UpdateSet/UpdateDescription.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Set\UseCases\UpdateSet;
+
+use App\Exceptions\BadRequestException;
+use App\Exceptions\NotFoundException;
+use App\Set\Set;
+use App\Set\SetRepository;
+
+class UpdateDescription
+{
+    public function __construct(private SetRepository $setRepository)
+    {
+    }
+
+    /**
+     * @throws BadRequestException
+     * @throws NotFoundException
+     */
+    public function execute(UpdateDescriptionRequest $request): Set
+    {
+        if ($request->id === null) {
+            throw new BadRequestException('setId is required');
+        }
+
+        if (
+            $request->description === null
+            || trim($request->description) === ''
+        ) {
+            throw new BadRequestException('description is required');
+        }
+
+        $set = $this->setRepository->find($request->id);
+        if ($set === null) {
+            throw new NotFoundException('Set not found');
+        }
+
+        $set->setDescription($request->description);
+
+        return $this->setRepository->update($set);
+    }
+}