[custom price] fix bug

Author: rez1dent3

src/Objects/Cart.php

@@ -90,12 +90,13 @@ public function getTotal(Customer $customer): string
         foreach ($this->items as $productId => $_items) {
             foreach ($_items as $item) {
                 $product = $item->getProduct();
-                $prices[$productId] = $item->getPricePerItem()
-                    ?? $prices[$productId]
-                    ?? $product->getAmountProduct($customer)
-                ;
+                $pricePerItem = $item->getPricePerItem();
+                if ($pricePerItem === null) {
+                    $prices[$productId] ??= $product->getAmountProduct($customer);
+                    $pricePerItem = $prices[$productId];
+                }
 
-                $price = $this->math->mul($this->getQuantity($product), $prices[$productId]);
+                $price = $this->math->mul(count($item), $pricePerItem);
                 $result = $this->math->add($result, $price);
             }
         }

src/Traits/CartPay.php

@@ -126,14 +126,17 @@ public function payCart(CartInterface $cart, bool $force = false): array
             foreach ($cart->getBasketDto()->items() as $item) {
                 foreach ($item->getItems() as $product) {
                     $productId = $product::class.':'.$castService->getModel($product)->getKey();
-                    $prices[$productId] = $item->getPricePerItem()
-                        ?? $prices[$productId]
-                        ?? $product->getAmountProduct($this);
+                    $pricePerItem = $item->getPricePerItem();
+                    if ($pricePerItem === null) {
+                        $prices[$productId] ??= $product->getAmountProduct($this);
+                        $pricePerItem = $prices[$productId];
+                    }
+
                     $transfers[] = $prepareService->transferLazy(
                         $this,
                         $product,
                         Transfer::STATUS_PAID,
-                        $prices[$productId],
+                        $pricePerItem,
                         $assistantService->getMeta($basketDto, $product)
                     );
                 }

tests/Units/Domain/ProductTest.php

@@ -269,19 +269,25 @@ public function testPayCustomPrice(): void
          */
         $buyer = BuyerFactory::new()->create();
         $product = ItemFactory::new()->create([
-            'quantity' => 1,
+            'quantity' => 2,
             'price' => 5_000,
         ]);
 
-        $buyer->deposit(1_000);
-        self::assertSame(1_000, $buyer->balanceInt);
+        self::assertSame(0, $buyer->balanceInt);
+
+        $buyer->deposit(6_000 + (int) $buyer->wallet->getKey());
+        self::assertSame(6_000 + (int) $buyer->wallet->getKey(), $buyer->balanceInt);
 
         $cart = app(Cart::class)
             ->withItem($product, pricePerItem: 1_000)
+            ->withItem($product)
         ;
 
+        self::assertSame(6000 + (int) $buyer->wallet->getKey(), (int) $cart->getTotal($buyer));
+
         $transfers = $buyer->payCart($cart);
-        self::assertCount(1, $transfers);
+        self::assertSame(0, $buyer->balanceInt);
+        self::assertCount(2, $transfers);
     }
 
     /**