RoundingErrors.php

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<?php
namespace Magento\Tax\Model\System\Message\Notification;

class RoundingErrors implements \Magento\Tax\Model\System\Message\NotificationInterface
{
    private $storeManager;

    private $urlBuilder;

    private $taxConfig;

    private $storesWithInvalidSettings;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\UrlInterface $urlBuilder,
        \Magento\Tax\Model\Config $taxConfig
    ) {
        $this->storeManager = $storeManager;
        $this->urlBuilder = $urlBuilder;
        $this->taxConfig = $taxConfig;
    }

    public function getIdentity()
    {
        return 'TAX_NOTIFICATION_ROUNDING_ERRORS';
    }

    public function isDisplayed()
    {
        if (!$this->taxConfig->isWrongDisplaySettingsIgnored() && $this->getStoresWithWrongSettings()) {
            return true;
        }
        return false;
    }

    public function getText()
    {
        $messageDetails = '';

        if (!empty($this->getStoresWithWrongSettings()) && !$this->taxConfig->isWrongDisplaySettingsIgnored()) {
            $messageDetails .= '<strong>';
            $messageDetails .= __('Your current tax configuration may result in rounding errors. ');
            $messageDetails .= '</strong><p>';
            $messageDetails .= __('Store(s) affected: ');
            $messageDetails .= implode(', ', $this->getStoresWithWrongSettings());
            $messageDetails .= '</p><p>';
            $messageDetails .= __(
                'Click on the link to <a href="%1">ignore this notification</a>',
                $this->urlBuilder->getUrl('tax/tax/ignoreTaxNotification', ['section' => 'price_display'])
            );
            $messageDetails .= "</p>";
        }

        return $messageDetails;
    }

    public function getSeverity()
    {
        return self::SEVERITY_CRITICAL;
    }

    private function checkSettings($store = null)
    {
        if ($this->taxConfig->getAlgorithm($store) == \Magento\Tax\Model\Calculation::CALC_UNIT_BASE) {
            return true;
        }
        return $this->taxConfig->getPriceDisplayType($store) != \Magento\Tax\Model\Config::DISPLAY_TYPE_BOTH
            && $this->taxConfig->getShippingPriceDisplayType($store) != \Magento\Tax\Model\Config::DISPLAY_TYPE_BOTH
            && !$this->taxConfig->displayCartPricesBoth($store)
            && !$this->taxConfig->displayCartSubtotalBoth($store)
            && !$this->taxConfig->displayCartShippingBoth($store)
            && !$this->taxConfig->displaySalesPricesBoth($store)
            && !$this->taxConfig->displaySalesSubtotalBoth($store)
            && !$this->taxConfig->displaySalesShippingBoth($store);
    }

    private function getStoresWithWrongSettings()
    {
        if (null !== $this->storesWithInvalidSettings) {
            return $this->storesWithInvalidSettings;
        }
        $this->storesWithInvalidSettings = [];
        $storeCollection = $this->storeManager->getStores(true);
        foreach ($storeCollection as $store) {
            if (!$this->checkSettings($store)) {
                $website = $store->getWebsite();
                $this->storesWithInvalidSettings[] = $website->getName() . ' (' . $store->getName() . ')';
            }
        }
        return $this->storesWithInvalidSettings;
    }
}