Share.php

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

class Share extends \Magento\Framework\App\Config\Value implements \Magento\Framework\Option\ArrayInterface
{
    const XML_PATH_CUSTOMER_ACCOUNT_SHARE = 'customer/account_share/scope';

    const SHARE_GLOBAL = 0;

    const SHARE_WEBSITE = 1;

    protected $_customerResource;

    protected $_storeManager;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Customer\Model\ResourceModel\Customer $customerResource,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_storeManager = $storeManager;
        $this->_customerResource = $customerResource;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function isGlobalScope()
    {
        return !$this->isWebsiteScope();
    }

    public function isWebsiteScope()
    {
        return $this->_config->getValue(
            self::XML_PATH_CUSTOMER_ACCOUNT_SHARE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        ) == self::SHARE_WEBSITE;
    }

    public function toOptionArray()
    {
        return [self::SHARE_GLOBAL => __('Global'), self::SHARE_WEBSITE => __('Per Website')];
    }

    public function beforeSave()
    {
        $value = $this->getValue();
        if ($value == self::SHARE_GLOBAL) {
            if ($this->_customerResource->findEmailDuplicates()) {
                //@codingStandardsIgnoreStart
                throw new \Magento\Framework\Exception\LocalizedException(
                    __(
                        'We can\'t share customer accounts globally when the accounts share identical email addresses on more than one website.'
                    )
                );
                //@codingStandardsIgnoreEnd
            }
        }
        return $this;
    }

    public function getSharedWebsiteIds($websiteId)
    {
        $ids = [];
        if ($this->isWebsiteScope()) {
            $ids[] = $websiteId;
        } else {
            foreach ($this->_storeManager->getWebsites() as $website) {
                $ids[] = $website->getId();
            }
        }
        return $ids;
    }
}