feat(category): include products from all descendant categories in paginated response

app/Domains/Commerce/Catalog/Services/CatalogService.php

@@ -2,8 +2,6 @@
 
 namespace App\Domains\Commerce\Catalog\Services;
 
-use App\Shared\Attachable\Models\Attachment;
-use App\Shared\Attachable\Services\AttachmentService;
 use App\Domains\Commerce\Catalog\Enums\CatalogItemType;
 use App\Domains\Commerce\Catalog\Models\Attribute;
 use App\Domains\Commerce\Catalog\Models\CatalogItem;
@@ -11,8 +9,10 @@ use App\Domains\Commerce\Catalog\Models\Category;
 use App\Domains\Commerce\Catalog\Models\Inventory;
 use App\Domains\Commerce\Catalog\Models\ItemAttribute;
 use App\Domains\Commerce\Catalog\Models\Variant;
-use App\Domains\Ticketing\Event\Models\EventDate;
 use App\Domains\Core\Tenant\Models\Tenant;
+use App\Domains\Ticketing\Event\Models\EventDate;
+use App\Shared\Attachable\Models\Attachment;
+use App\Shared\Attachable\Services\AttachmentService;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Pagination\LengthAwarePaginator;
 use Illuminate\Support\Facades\DB;
@@ -286,9 +286,11 @@ class CatalogService
         int $perPage,
         int $page,
     ): LengthAwarePaginator {
+        $categoryIds = $this->categoryAndDescendantIds($tenant, $category);
+
         return CatalogItem::query()
             ->forTenantCatalog($tenant)
-            ->where('category_id', $category->id)
+            ->whereIn('category_id', $categoryIds)
             ->whereAvailable()
             ->with([
                 'attachments',
@@ -306,6 +308,34 @@ class CatalogService
             ->paginate(perPage: $perPage, pageName: 'page', page: $page);
     }
 
+    /** @return array<int, int> */
+    private function categoryAndDescendantIds(Tenant $tenant, Category $category): array
+    {
+        $childrenByParent = Category::query()
+            ->where('tenant_code', $tenant->codigo)
+            ->get(['id', 'categoria_id'])
+            ->groupBy('categoria_id');
+
+        $categoryIds = [];
+        $pendingIds = [$category->id];
+
+        while ($pendingIds !== []) {
+            $categoryId = array_shift($pendingIds);
+
+            if (isset($categoryIds[$categoryId])) {
+                continue;
+            }
+
+            $categoryIds[$categoryId] = $categoryId;
+
+            foreach ($childrenByParent->get($categoryId, collect()) as $child) {
+                $pendingIds[] = $child->id;
+            }
+        }
+
+        return array_values($categoryIds);
+    }
+
     public function delete(CatalogItem $catalogItem): void
     {
         DB::transaction(function () use ($catalogItem): void {