ProductPriceCalculator.php

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<?php
namespace Magento\CatalogRule\Model\Indexer;

class ProductPriceCalculator
{
    private $priceCurrency;

    public function __construct(\Magento\Framework\Pricing\PriceCurrencyInterface $priceCurrency)
    {
        $this->priceCurrency = $priceCurrency;
    }

    public function calculate($ruleData, $productData = null)
    {
        if ($productData !== null && isset($productData['rule_price'])) {
            $productPrice = $productData['rule_price'];
        } else {
            $productPrice = $ruleData['default_price'];
        }

        switch ($ruleData['action_operator']) {
            case 'to_fixed':
                $productPrice = min($ruleData['action_amount'], $productPrice);
                break;
            case 'to_percent':
                $productPrice = $productPrice * $ruleData['action_amount'] / 100;
                break;
            case 'by_fixed':
                $productPrice = max(0, $productPrice - $ruleData['action_amount']);
                break;
            case 'by_percent':
                $productPrice = $productPrice * (1 - $ruleData['action_amount'] / 100);
                break;
            default:
                $productPrice = 0;
        }

        return $this->priceCurrency->round($productPrice);
    }
}