StructurePlugin.php

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<?php
namespace Magento\Paypal\Model\Config;

use Magento\Config\Model\Config\ScopeDefiner;
use Magento\Config\Model\Config\Structure;
use Magento\Config\Model\Config\Structure\Element\Section;
use Magento\Config\Model\Config\Structure\ElementInterface;
use Magento\Paypal\Helper\Backend as BackendHelper;
use Magento\Framework\App\ObjectManager;
use Magento\Paypal\Model\Config\Structure\PaymentSectionModifier;

class StructurePlugin
{
    const REQUEST_PARAM_COUNTRY = 'paypal_country';

    private $backendHelper;

    private $scopeDefiner;

    private $paymentSectionModifier;

    private static $paypalConfigCountries = [
        'payment_us',
        'payment_ca',
        'payment_au',
        'payment_gb',
        'payment_jp',
        'payment_fr',
        'payment_it',
        'payment_es',
        'payment_hk',
        'payment_nz',
        'payment_de',
    ];

    public function __construct(
        ScopeDefiner $scopeDefiner,
        BackendHelper $backendHelper,
        PaymentSectionModifier $paymentSectionModifier = null
    ) {
        $this->scopeDefiner = $scopeDefiner;
        $this->backendHelper = $backendHelper;
        $this->paymentSectionModifier = $paymentSectionModifier
                                      ?: ObjectManager::getInstance()->get(PaymentSectionModifier::class);
    }

    public static function getPaypalConfigCountries($addOther = false)
    {
        $countries = self::$paypalConfigCountries;

        if ($addOther) {
            $countries[] = 'payment_other';
        }

        return $countries;
    }

    public function aroundGetElementByPathParts(Structure $subject, \Closure $proceed, array $pathParts)
    {
        $isSectionChanged = $pathParts[0] == 'payment';

        if ($isSectionChanged) {
            $requestedCountrySection = 'payment_' . strtolower($this->backendHelper->getConfigurationCountryCode());

            if (in_array($requestedCountrySection, self::getPaypalConfigCountries())) {
                $pathParts[0] = $requestedCountrySection;
            } else {
                $pathParts[0] = 'payment_other';
            }
        }

        $result = $proceed($pathParts);

        if ($isSectionChanged && $result) {
            if ($result instanceof Section) {
                $this->restructurePayments($result);
                $result->setData(
                    array_merge(
                        $result->getData(),
                        ['showInDefault' => true, 'showInWebsite' => true, 'showInStore' => true]
                    ),
                    $this->scopeDefiner->getScope()
                );
            }
        }

        return $result;
    }

    private function restructurePayments(Section $result)
    {
        $sectionData = $result->getData();
        $sectionInitialStructure = isset($sectionData['children']) ? $sectionData['children'] : [];
        $sectionChangedStructure = $this->paymentSectionModifier->modify($sectionInitialStructure);
        $sectionData['children'] = $sectionChangedStructure;
        $result->setData($sectionData, $this->scopeDefiner->getScope());
    }
}