AdaptProductSalabilityPlugin.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryProductAlert\Plugin;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\InventoryApi\Api\Data\StockInterface;
use Magento\InventorySalesApi\Api\Data\SalesChannelInterface;
use Magento\InventorySalesApi\Api\IsProductSalableInterface;
use Magento\InventorySalesApi\Api\StockResolverInterface;
use Magento\ProductAlert\Model\ProductSalability;
use Magento\Store\Api\Data\WebsiteInterface;

class AdaptProductSalabilityPlugin
{
    private $stockResolver;

    private $isProductSalable;

    public function __construct(
        StockResolverInterface $stockResolver,
        IsProductSalableInterface $isProductSalable
    ) {
        $this->stockResolver = $stockResolver;
        $this->isProductSalable = $isProductSalable;
    }

    public function aroundIsSalable(
        ProductSalability $productSalability,
        callable $proceed,
        ProductInterface $product,
        WebsiteInterface $website
    ): bool {
        $stock = $this->stockResolver->execute(SalesChannelInterface::TYPE_WEBSITE, $website->getCode());
        $isSalable = $this->isProductSalable->execute($product->getSku(), (int)$stock->getStockId());

        return $isSalable;
    }
}