feat: implement product seeding logic from image catalog and add supporting service methods and requests

app/Domains/Catalog/Requests/StoreProductRequest.php

@@ -31,6 +31,7 @@ class StoreProductRequest extends FormRequest
             'nombre' => ['required', 'string', 'max:255'],
             'descripcion' => ['nullable', 'string'],
             'precio' => ['required', 'numeric', 'min:0'],
+            'stock' => ['sometimes', 'integer', 'min:0'],
             'attribute_ids' => ['sometimes', 'array'],
             'attribute_ids.*' => [
                 'required',

app/Domains/Catalog/Services/ProductService.php

@@ -26,7 +26,8 @@ class ProductService
         return DB::transaction(function () use ($tenant, $data) {
             $attributeIds = $data['attribute_ids'] ?? [];
             $images = $data['images'] ?? [];
-            unset($data['attribute_ids'], $data['images']);
+            $stock = $data['stock'] ?? 0;
+            unset($data['attribute_ids'], $data['images'], $data['stock']);
 
             /** @var Product $product */
             $product = Product::query()->create([
@@ -40,6 +41,12 @@ class ProductService
                 $this->syncProductImages($product, $images);
             }
 
+            // Create default variant with stock
+            $this->createVariant($product, [
+                'stock' => $stock,
+                'definitions' => [],
+            ]);
+
             return $product->load(['attributes.options', 'attachments', 'brand', 'category']);
         });
     }
@@ -109,6 +116,17 @@ class ProductService
             $images = $data['images'] ?? [];
             unset($data['images']);
 
+            // If the variant being created has definitions, it is a real variant.
+            // Remove any default variants (those without definitions).
+            $hasDefinitions = ! empty($data['definitions']);
+            if ($hasDefinitions) {
+                $defaultVariants = $product->variants()->whereDoesntHave('definitions')->get();
+                foreach ($defaultVariants as $defaultVariant) {
+                    $this->deleteVariantAttachments($defaultVariant);
+                    $product->deleteVariant($defaultVariant);
+                }
+            }
+
             $variant = $product->createVariant($data);
 
             if (! empty($images)) {
@@ -153,6 +171,14 @@ class ProductService
             $product = $variant->product;
             $this->deleteVariantAttachments($variant);
             $product->deleteVariant($variant);
+
+            // Re-create a default variant with stock 0 if it has no variants left
+            if ($product->variants()->count() === 0) {
+                $product->createVariant([
+                    'stock' => 0,
+                    'definitions' => [],
+                ]);
+            }
         });
     }