feat(cart): implement cart editing policies and update related functionality

app/Domains/Cart/Resources/CartItemResource.php

@@ -4,6 +4,7 @@ namespace App\Domains\Cart\Resources;
 
 use App\Domains\Cart\Models\CartItem;
 use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\Variant;
 use App\Domains\Tenant\Models\Tenant;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
@@ -22,6 +23,8 @@ class CartItemResource extends JsonResource
         $imageUrl = null;
         $tenant = $request->route('tenant');
         $displayImage = ! $tenant instanceof Tenant || $tenant->display_cart_item_images;
+        $includeVariants = $tenant instanceof Tenant
+            && $tenant->cart_editing_policy->allowsVariantChanges();
 
         if ($displayImage && $selectedItem?->relationLoaded('attachments')) {
             $imageUrl = $selectedItem->attachments->first()?->getTemporaryUrl(1440);
@@ -39,14 +42,27 @@ class CartItemResource extends JsonResource
             'variant_id' => $this->variant_id,
             'nombre' => $selectedItem?->getName(),
             'imagen' => $imageUrl,
-            'variant' => $this->variant === null ? null : [
-                'id' => $this->variant->id,
-                'precio' => $this->formatMoney($this->variant->getPrice()),
-                'stock_tecnico' => $this->catalogItem->inventory_policy === InventoryPolicy::Unlimited
-                    ? null
-                    : $this->variant->inventory->availableStock(),
-                'values' => $this->variant->selectorOptions($this->catalogItem->itemAttributes),
-            ],
+            'variant' => $this->variant === null ? null : $this->variantData($this->variant),
+            'variants' => $this->when(
+                $includeVariants,
+                fn () => $this->catalogItem
+                    ->visibleVariants($this->variant_id)
+                    ->map(fn (Variant $variant): array => $this->variantData($variant))
+                    ->values(),
+            ),
+        ];
+    }
+
+    /** @return array<string, mixed> */
+    protected function variantData(Variant $variant): array
+    {
+        return [
+            'id' => $variant->id,
+            'precio' => $this->formatMoney($variant->precio ?? $this->catalogItem->precio),
+            'stock_tecnico' => $this->catalogItem->inventory_policy === InventoryPolicy::Unlimited
+                ? null
+                : $variant->inventory->availableStock(),
+            'values' => $variant->selectorOptions($this->catalogItem->itemAttributes),
         ];
     }