add persisted set ordering

backend/app/Controllers/SetController.php

@@ -11,6 +11,8 @@ use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRoot;
 use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRootRequest;
 use App\Set\UseCases\DeleteSet\DeleteSet;
 use App\Set\UseCases\DeleteSet\DeleteSetRequest;
+use App\Set\UseCases\ReorderSets\ReorderSets;
+use App\Set\UseCases\ReorderSets\ReorderSetsRequest;
 use App\Set\UseCases\UpdateSet\UpdateSet;
 use App\Set\UseCases\UpdateSet\UpdateSetRequest;
 use App\Shared\Files\Filesystem;
@@ -26,19 +28,34 @@ class SetController
         private CreateSetWithRoot $createSetWithRoot,
         private UpdateSet $updateSet,
         private DeleteSet $deleteSet,
+        private ReorderSets $reorderSets,
         private Filesystem $filesystem,
     ) {
     }
 
     public function index(): JsonResponse
     {
-        $sets = [];
-        foreach ($this->setRepository->getAll() as $set) {
-            $sets[] = $this->buildSetPayload($set);
+        return new JsonResponse([
+            'sets' => $this->buildSetPayloads(
+                $this->setRepository->getAll(),
+            ),
+        ], 200);
+    }
+
+    public function reorder(Request $request): JsonResponse
+    {
+        try {
+            $sets = $this->reorderSets->execute(new ReorderSetsRequest(
+                setIds: $this->intArrayInput($request, 'setIds'),
+            ));
+        } catch (BadRequestException $exception) {
+            return new JsonResponse([
+                'error' => $exception->getMessage(),
+            ], 400);
         }
 
         return new JsonResponse([
-            'sets' => $sets,
+            'sets' => $this->buildSetPayloads($sets),
         ], 200);
     }
 
@@ -141,6 +158,58 @@ class SetController
         ];
     }
 
+    /**
+     * @param DomainSet[] $sets
+     * @return array<int, array{
+     *     id: int,
+     *     name: string,
+     *     description: string,
+     *     iconImageUrl: string,
+     *     rootElementId: int|null
+     * }>
+     */
+    private function buildSetPayloads(array $sets): array
+    {
+        $setPayloads = [];
+        foreach ($sets as $set) {
+            $setPayloads[] = $this->buildSetPayload($set);
+        }
+
+        return $setPayloads;
+    }
+
+    /**
+     * @return int[]|null
+     */
+    private function intArrayInput(Request $request, string $key): ?array
+    {
+        if (! $request->exists($key)) {
+            return null;
+        }
+
+        $value = $request->input($key);
+        if (! is_array($value)) {
+            return null;
+        }
+
+        $integerValues = [];
+        foreach ($value as $item) {
+            if (is_int($item)) {
+                $integerValues[] = $item;
+                continue;
+            }
+
+            if (is_string($item) && ctype_digit($item)) {
+                $integerValues[] = (int) $item;
+                continue;
+            }
+
+            return null;
+        }
+
+        return $integerValues;
+    }
+
     private function stringInput(Request $request, string $key): ?string
     {
         if (! $request->exists($key)) {