LYNX-387: Add original row total price (#229)

Author: eliseacornejo

app/code/Magento/Catalog/Test/Fixture/Product.php

@@ -36,7 +36,8 @@ class Product implements RevertibleDataFixtureInterface
         'visibility' => Visibility::VISIBILITY_BOTH,
         'status' => Status::STATUS_ENABLED,
         'custom_attributes' => [
-            'tax_class_id' => '2'
+            'tax_class_id' => '2',
+            'special_price' => null,
         ],
         'extension_attributes' => [
             'website_ids' => [1],

app/code/Magento/QuoteGraphQl/Model/Resolver/CartItemPrices.php

@@ -12,6 +12,7 @@
 use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Framework\ObjectManager\ResetAfterRequestInterface;
+use Magento\Framework\Pricing\PriceCurrencyInterface;
 use Magento\Quote\Model\Cart\Totals;
 use Magento\Quote\Model\Quote\Item;
 use Magento\QuoteGraphQl\Model\Cart\TotalsCollector;
@@ -30,10 +31,12 @@ class CartItemPrices implements ResolverInterface, ResetAfterRequestInterface
     /**
      * @param TotalsCollector $totalsCollector
      * @param GetDiscounts $getDiscounts
+     * @param PriceCurrencyInterface $priceCurrency
      */
     public function __construct(
         private readonly TotalsCollector $totalsCollector,
-        private readonly GetDiscounts $getDiscounts
+        private readonly GetDiscounts $getDiscounts,
+        private readonly PriceCurrencyInterface $priceCurrency
     ) {
     }
 
@@ -97,7 +100,24 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
             'discounts' => $this->getDiscounts->execute(
                 $cartItem->getQuote(),
                 $cartItem->getExtensionAttributes()->getDiscounts() ?? []
-            )
+            ),
+            'original_row_total' => [
+                'currency' => $currencyCode,
+                'value' => $this->getOriginalRowTotal($cartItem),
+            ],
         ];
     }
+
+    /**
+     * Calculate the original price row total
+     *
+     * @param Item $cartItem
+     * @return float
+     */
+    private function getOriginalRowTotal(Item $cartItem): float
+    {
+        $qty = $cartItem->getTotalQty();
+        // Round unit price before multiplying to prevent losing 1 cent on subtotal
+        return $this->priceCurrency->round($cartItem->getOriginalPrice()) * $qty;
+    }
 }

app/code/Magento/QuoteGraphQl/etc/schema.graphqls

@@ -452,6 +452,7 @@ type CartItemPrices @doc(description: "Contains details about the price of the i
     row_total_including_tax: Money! @doc(description: "The value of `row_total` plus the tax applied to the item.")
     discounts: [Discount] @doc(description: "An array of discounts to be applied to the cart item.")
     total_item_discount: Money @doc(description: "The total of all discounts applied to the item.")
+    original_row_total: Money! @doc(description: "The value of the original price multiplied by the quantity of the item.")
 }
 
 type SelectedCustomizableOption @doc(description: "Identifies a customized product that has been placed in a cart.") {

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/CartTotalsTest.php

@@ -266,6 +266,40 @@ public function testGetTotalsWithNoTaxApplied()
         self::assertEmpty($pricesResponse['applied_taxes']);
     }
 
+    #[
+        DataFixture(ProductFixture::class, [
+            'price' => 15,
+            'custom_attributes' => [
+                'special_price' => 10
+             ]
+        ], 'p'),
+        DataFixture(GuestCartFixture::class, as: 'cart'),
+        DataFixture(AddProductToCartFixture::class, ['cart_id' => '$cart.id$', 'product_id' => '$p.id$', 'qty' => 2]),
+        DataFixture(SetBillingAddressFixture::class, ['cart_id' => '$cart.id$']),
+        DataFixture(SetShippingAddressFixture::class, ['cart_id' => '$cart.id$']),
+    ]
+    public function testGetTotalsWithOriginalRowTotalPrice()
+    {
+        $cart = $this->fixtures->get('cart');
+        $maskedQuoteId = $this->quoteIdToMaskedQuoteIdInterface->execute((int) $cart->getId());
+        $query = $this->getQuery($maskedQuoteId);
+        $response = $this->graphQlQuery($query);
+
+        $cartItem = $response['cart']['items'][0];
+        self::assertEquals(10, $cartItem['prices']['price']['value']);
+        self::assertEquals(10, $cartItem['prices']['price_including_tax']['value']);
+        self::assertEquals(20, $cartItem['prices']['row_total']['value']);
+        self::assertEquals(20, $cartItem['prices']['row_total_including_tax']['value']);
+        self::assertEquals(30, $cartItem['prices']['original_row_total']['value']);
+
+        $pricesResponse = $response['cart']['prices'];
+        self::assertEquals(20, $pricesResponse['grand_total']['value']);
+        self::assertEquals(20, $pricesResponse['subtotal_including_tax']['value']);
+        self::assertEquals(20, $pricesResponse['subtotal_excluding_tax']['value']);
+        self::assertEquals(20, $pricesResponse['subtotal_with_discount_excluding_tax']['value']);
+        self::assertEmpty($pricesResponse['applied_taxes']);
+    }
+
     /**
      * The totals calculation is based on quote address.
      * But the totals should be calculated even if no address is set
@@ -373,6 +407,10 @@ private function getQuery(string $maskedQuoteId): string
                 value
             }
         }
+        original_row_total {
+            value
+            currency
+        }
       }
     }
     prices {