<?php
declare(strict_types=1);

namespace Leadlion\SalesOrder\Model\Config;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Store\Model\ScopeInterface;

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

    /**
     * Upload max file size in kilobytes
     *
     * @var int
     */
    protected $_maxFileSize = 2048;
    
   /**
     * Return path to directory for upload file
     *
     * @return string
     * @throw \Magento\Framework\Exception\LocalizedException
     */
    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;
    }

    /**
     * Getter for allowed extensions of uploaded files.
     *
     * @return string[]
     */
    protected function _getAllowedExtensions()
    {
        return ['jpg', 'jpeg', 'gif', 'png', 'svg'];
    }

    /**
     * @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($value['delete']);
        if ($this->isTmpFileAvailable($value) && $imageName = $this->getUploadedImageName($value)) {
            $fileTmpName = $this->getTmpFileName();

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

    /**
     * Check if temporary file is available for new image upload.
     *
     * @param array $value
     * @return bool
     */
    private function isTmpFileAvailable($value)
    {
        return is_array($value) && isset($value[0]['tmp_name']);
    }

    /**
     * Gets image name from $value array.
     *
     * Will return empty string in a case when $value is not an array.
     *
     * @param array $value Attribute value
     * @return string
     */
    private function getUploadedImageName($value)
    {
        if (is_array($value) && isset($value[0]['name'])) {
            return $value[0]['name'];
        }

        return '';
    }
}