ToFixed.php

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<?php
namespace Magento\SalesRule\Model\Rule\Action\Discount;

class ToFixed extends AbstractDiscount
{
    public function calculate($rule, $item, $qty)
    {
        $discountData = $this->discountFactory->create();

        $store = $item->getQuote()->getStore();

        $itemPrice = $this->validator->getItemPrice($item);
        $baseItemPrice = $this->validator->getItemBasePrice($item);
        $itemOriginalPrice = $this->validator->getItemOriginalPrice($item);
        $baseItemOriginalPrice = $this->validator->getItemBaseOriginalPrice($item);

        $quoteAmount = $this->priceCurrency->convert($rule->getDiscountAmount(), $store);

        $discountData->setAmount($qty * ($itemPrice - $quoteAmount));
        $discountData->setBaseAmount($qty * ($baseItemPrice - $rule->getDiscountAmount()));
        $discountData->setOriginalAmount($qty * ($itemOriginalPrice - $quoteAmount));
        $discountData->setBaseOriginalAmount($qty * ($baseItemOriginalPrice - $rule->getDiscountAmount()));

        return $discountData;
    }
}