ConfiguredRegularPrice.php

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<?php
declare(strict_types=1);

namespace Magento\GroupedProduct\Pricing\Price;

use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\Product\Configuration\Item\ItemInterface;
use Magento\Framework\Pricing\Price\AbstractPrice;
use Magento\Catalog\Pricing\Price\ConfiguredPriceInterface;

class ConfiguredRegularPrice extends AbstractPrice implements ConfiguredPriceInterface
{
    const PRICE_CODE = ConfiguredPriceInterface::CONFIGURED_REGULAR_PRICE_CODE;

    private $item;

    public function setItem(ItemInterface $item): ConfiguredRegularPrice
    {
        $this->item = $item;

        return $this;
    }

    protected function calculatePrice(): float
    {
        $value = 0.;
        $typeInstance = $this->getProduct()->getTypeInstance();
        $associatedProducts = $typeInstance
            ->setStoreFilter($this->getProduct()->getStore(), $this->getProduct())
            ->getAssociatedProducts($this->getProduct());

        foreach ($associatedProducts as $product) {
            $customOption = $this->getProduct()
                ->getCustomOption('associated_product_' . $product->getId());
            if (!$customOption) {
                continue;
            }
            $finalPrice = $product->getPriceInfo()
                ->getPrice(\Magento\Catalog\Pricing\Price\RegularPrice::PRICE_CODE)
                ->getValue();
            $value += $finalPrice * ($customOption->getValue() ?: 1);
        }

        return $value;
    }

    public function getValue()
    {
        if ($this->item) {
            return $this->calculatePrice();
        } else {
            if ($this->value === null) {
                $price = $this->product->getPrice();
                $priceInCurrentCurrency = $this->priceCurrency->convertAndRound($price);
                $this->value = $priceInCurrentCurrency ? (float)$priceInCurrentCurrency : false;
            }

            return $this->value;
        }
    }
}