AbstractStockqtyPlugin.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySalesFrontendUi\Plugin\Block\Stockqty;

use Magento\CatalogInventory\Block\Stockqty\AbstractStockqty;
use Magento\InventoryConfigurationApi\Api\Data\StockItemConfigurationInterface;
use Magento\InventoryConfigurationApi\Api\GetStockItemConfigurationInterface;
use Magento\InventoryConfigurationApi\Model\IsSourceItemManagementAllowedForProductTypeInterface;
use Magento\InventorySalesApi\Api\GetProductSalableQtyInterface;
use Magento\InventorySalesApi\Model\StockByWebsiteIdResolverInterface;
use Magento\Framework\Exception\LocalizedException;

class AbstractStockqtyPlugin
{
    private $getStockItemConfiguration;

    private $stockByWebsiteId;

    private $getProductSalableQty;

    private $isSourceItemManagementAllowedForProductType;

    public function __construct(
        StockByWebsiteIdResolverInterface $stockByWebsiteId,
        GetStockItemConfigurationInterface $getStockItemConfig,
        GetProductSalableQtyInterface $getProductSalableQty,
        IsSourceItemManagementAllowedForProductTypeInterface $isSourceItemManagementAllowedForProductType
    ) {
        $this->getStockItemConfiguration = $getStockItemConfig;
        $this->stockByWebsiteId = $stockByWebsiteId;
        $this->getProductSalableQty = $getProductSalableQty;
        $this->isSourceItemManagementAllowedForProductType = $isSourceItemManagementAllowedForProductType;
    }

    public function aroundIsMsgVisible(AbstractStockqty $subject, callable $proceed): bool
    {
        $productType = $subject->getProduct()->getTypeId();
        if (!$this->isSourceItemManagementAllowedForProductType->execute($productType)) {
            return false;
        }

        $sku = $subject->getProduct()->getSku();
        $websiteId = (int)$subject->getProduct()->getStore()->getWebsiteId();
        $stockId = (int)$this->stockByWebsiteId->execute($websiteId)->getStockId();
        $stockItemConfig = $this->getStockItemConfiguration->execute($sku, $stockId);

        return ($stockItemConfig->getBackorders() === StockItemConfigurationInterface::BACKORDERS_NO
            || $stockItemConfig->getBackorders() !== StockItemConfigurationInterface::BACKORDERS_NO
            && $stockItemConfig->getMinQty() < 0)
            && $this->getProductSalableQty->execute($sku, $stockId) <= $stockItemConfig->getStockThresholdQty();
    }

    public function aroundGetStockQtyLeft(AbstractStockqty $subject, callable $proceed): float
    {
        $sku = $subject->getProduct()->getSku();
        $websiteId = (int)$subject->getProduct()->getStore()->getWebsiteId();
        $stockId = (int)$this->stockByWebsiteId->execute($websiteId)->getStockId();
        return $this->getProductSalableQty->execute($sku, $stockId);
    }
}