feat: add getTotalAmount method to Cart and refactor Purchase model to utilize it

app/Domains/Cart/Models/Cart.php

@@ -59,6 +59,18 @@ class Cart extends Model
         return $this->hasMany(CartItem::class, 'cart_id');
     }
 
+    public function getTotalAmount(): float
+    {
+        $items = $this->relationLoaded('items')
+            ? $this->getRelation('items')
+            : $this->items()->with('variant.product')->get();
+
+        return (float) $items->reduce(
+            fn (float $carry, $item): float => $carry + ((float) ($item->variant?->product?->precio ?? 0) * $item->cantidad),
+            0.0,
+        );
+    }
+
     public function addItem(int $productVariantId, int $quantity): CartItem
     {
         if ($quantity <= 0) {

app/Domains/Purchase/Controllers/PurchaseController.php

@@ -11,6 +11,7 @@ use App\Http\Controllers\Controller;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use App\Domains\Purchase\Services\CheckoutService;
+use Illuminate\Support\Facades\Log;
 use Illuminate\Validation\ValidationException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
@@ -74,13 +75,11 @@ class PurchaseController extends Controller
         }
 
         if ($method === 'qr') {
-            $telepagosQr = $compra->telepagosQr;
-
-            if (!$telepagosQr) {
             $telepagosService = new \App\Domains\Integration\Services\TelepagosIntegrationService();
             $telepagosService->forTenant($tenant->codigo);
 
             try {
+                Log::info("Generating QR for purchase ID: {$compra->id}, amount: {$compra->getTotalAmount()}");
                 $qrResponse = $telepagosService->generateQr(
                     $compra->getTotalAmount(),
                     'Compra',
@@ -96,7 +95,6 @@ class PurchaseController extends Controller
                     'message' => 'Error generating QR: ' . $e->getMessage()
                 ], 500);
             }
-            }
 
             return response()->json([
                 'payment_method' => 'qr',

app/Domains/Purchase/Models/Purchase.php

@@ -10,7 +10,6 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
-use Illuminate\Support\Collection;
 
 #[Fillable([
     'cart_id',
@@ -59,7 +58,7 @@ class Purchase extends Model
      */
     public function cart(): BelongsTo
     {
-        return $this->belongsTo(Cart::class, 'cart_id')->withTrashed();
+        return $this->belongsTo(Cart::class, 'cart_id');
     }
 
     /**
@@ -92,21 +91,15 @@ class Purchase extends Model
             return (float) $this->items()->sum('total');
         }
 
-        $cart = $this->relationLoaded('cart') ? $this->getRelation('cart') : $this->cart;
+        $cart = $this->relationLoaded('cart')
+            ? $this->getRelation('cart')
+            : $this->cart()->first();
 
-        if ($cart === null) {
+        if (! $cart) {
             return 0.0;
         }
 
-        /** @var Collection<int, mixed> $items */
+        return $cart->getTotalAmount();
-        $items = $cart->relationLoaded('items')
-            ? $cart->getRelation('items')
-            : $cart->items()->with('variant.product')->get();
-
-        return $items->reduce(
-            static fn (float $carry, $item): float => $carry + ((float) ($item->variant?->product?->precio ?? 0) * (int) $item->cantidad),
-            0.0,
-        );
     }
 
     public function finalize(): void