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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Config\Model\Config\Backend;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\Serializer\Json;

/**
 * Serialized backend model
 *
 * @api
 * @since 100.0.2
 */
class Serialized extends \Magento\Framework\App\Config\Value
{
    /**
     * @var Json
     */
    private $serializer;

    /**
     * Serialized constructor
     *
     * @param \Magento\Framework\Model\Context $context
     * @param \Magento\Framework\Registry $registry
     * @param \Magento\Framework\App\Config\ScopeConfigInterface $config
     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
     * @param \Magento\Framework\Model\ResourceModel\AbstractResource|null $resource
     * @param \Magento\Framework\Data\Collection\AbstractDb|null $resourceCollection
     * @param array $data
     * @param Json|null $serializer
     */
    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\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = [],
        Json $serializer = null
    ) {
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    /**
     * Processing object after load data
     *
     * @return void
     */
    protected function _afterLoad()
    {
        $value = $this->getValue();
        if (!is_array($value)) {
            try {
                $this->setValue(empty($value) ? false : $this->serializer->unserialize($value));
            } catch (\Exception $e) {
                $this->_logger->critical(
                    sprintf(
                        'Failed to unserialize %s config value. The error is: %s',
                        $this->getPath(),
                        $e->getMessage()
                    )
                );
                $this->setValue(false);
            }
        }
    }

    /**
     * Processing object before save data
     *
     * @return $this
     */
    public function beforeSave()
    {
        if (is_array($this->getValue())) {
            $this->setValue($this->serializer->serialize($this->getValue()));
        }
        parent::beforeSave();
        return $this;
    }

    /**
     * Get old value from existing config
     *
     * @return string
     */
    public function getOldValue()
    {
        // If the value is retrieved from defaults defined in config.xml
        // it may be returned as an array.
        $value = $this->_config->getValue(
            $this->getPath(),
            $this->getScope() ?: ScopeConfigInterface::SCOPE_TYPE_DEFAULT,
            $this->getScopeCode()
        );

        if (is_array($value)) {
            return $this->serializer->serialize($value);
        }

        return (string)$value;
    }
}