<?php
/**
 * Copyright © 2016 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

/**
 * Backend model for uploading transactional emails custom logo image
 *
 * @author     Magento Core Team <core@magentocommerce.com>
 */
namespace Magento\Config\Model\Config\Backend\Email;

class Logo extends \Magento\Config\Model\Config\Backend\Image
{
    /**
     * The tail part of directory path for uploading
     */
    const UPLOAD_DIR = 'email/logo';

    /**
     * Upload max file size in kilobytes
     *
     * @var int
     */
    protected $_maxFileSize = 2048;

    /**
     * Return path to directory for upload file
     *
     * @return string
     */
    protected function _getUploadDir()
    {
        return $this->_mediaDirectory->getAbsolutePath($this->_appendScopeInfo(self::UPLOAD_DIR));
    }

    /**
     * Makes a decision about whether to add info about the scope
     *
     * @return boolean
     */
    protected function _addWhetherScopeInfo()
    {
        return true;
    }

    /**
     * @return string|null
     */
    protected function getTmpFileName()
    {
        $tmpName = null;
        if (isset($_FILES['groups'])) {
            $tmpName = $_FILES['groups']['tmp_name'][$this->getGroupId()]['fields'][$this->getField()]['value'];
        } else {
            $tmpName = is_array($this->getValue()) ? $this->getValue()['tmp_name'] : null;
        }
        return $tmpName;
    }

    /**
     * Save uploaded file before saving config value
     *
     * Save changes and delete file if "delete" option passed
     *
     * @return $this
     */
    public function beforeSave()
    {
        $value = $this->getValue();
        $deleteFlag = is_array($value) && !empty($value['delete']);
        $fileTmpName = $this->getTmpFileName();

        if ($this->getOldValue() && ($fileTmpName || $deleteFlag)) {
            $this->_mediaDirectory->delete(self::UPLOAD_DIR . '/' . $this->getOldValue());
        }
        return parent::beforeSave();
    }
}