feat(cart): enhance item update functionality to support variant changes and stock management; update related request validation and resource formatting; add tests for variant handling in cart

app/Domains/Cart/Resources/CartItemResource.php

@@ -3,8 +3,11 @@
 namespace App\Domains\Cart\Resources;
 
 use App\Domains\Cart\Models\CartItem;
+use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\Variant;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
+use Illuminate\Support\Collection;
 
 /**
  * @mixin CartItem
@@ -36,10 +39,42 @@ class CartItemResource extends JsonResource
             'product' => $selectedItem === null ? null : [
                 'nombre' => $selectedItem->getName(),
                 'imagen' => $imageUrl,
+                'variants' => $this->catalogItem->variants
+                    ->map(fn (Variant $variant): array => [
+                        'id' => $variant->id,
+                        'precio' => $this->formatMoney($variant->getPrice()),
+                        'stock_tecnico' => $this->catalogItem->inventory_policy === InventoryPolicy::Unlimited
+                            ? null
+                            : $variant->inventory->availableStock(),
+                        'values' => $this->variantValues($variant),
+                    ])
+                    ->values(),
             ],
         ];
     }
 
+    /** @return Collection<string, string|array<int, string>> */
+    private function variantValues(Variant $variant): Collection
+    {
+        $values = $variant->selectionValues();
+        $eventDates = $variant->selectedEventDates();
+
+        if ($eventDates->isNotEmpty()) {
+            $labels = $eventDates
+                ->map(fn ($eventDate): string => $eventDate->date->format('d/m/Y').' · '
+                    .substr($eventDate->time_start, 0, 5).' a '
+                    .substr($eventDate->time_end, 0, 5))
+                ->values();
+
+            $values->put(
+                'event_date',
+                $labels->count() === 1 ? $labels->first() : $labels->all(),
+            );
+        }
+
+        return $values;
+    }
+
     protected function formatMoney(float|int|string|null $amount): string
     {
         return number_format((float) ($amount ?? 0), 2, '.', '');