AdaptGetProductStockStatusPlugin.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryCatalog\Plugin\CatalogInventory\Api\StockRegistry;

use Magento\CatalogInventory\Api\StockRegistryInterface;
use Magento\InventoryCatalogApi\Model\GetSkusByProductIdsInterface;
use Magento\InventorySalesApi\Api\Data\SalesChannelInterface;
use Magento\InventorySalesApi\Api\IsProductSalableInterface;
use Magento\InventorySalesApi\Api\StockResolverInterface;
use Magento\Store\Model\StoreManagerInterface;

class AdaptGetProductStockStatusPlugin
{
    private $isProductSalable;

    private $getSkusByProductIds;

    private $storeManager;

    private $stockResolver;

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

    public function aroundGetProductStockStatus(
        StockRegistryInterface $subject,
        callable $proceed,
        $productId,
        $scopeId = null
    ): int {
        $websiteCode = null === $scopeId
            ? $this->storeManager->getWebsite()->getCode()
            : $this->storeManager->getWebsite($scopeId)->getCode();
        $stockId = $this->stockResolver->execute(SalesChannelInterface::TYPE_WEBSITE, $websiteCode)->getStockId();
        $sku = $this->getSkusByProductIds->execute([$productId])[$productId];

        return (int)$this->isProductSalable->execute($sku, $stockId);
    }
}