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<?php

/**
 * @package     Joomla.Plugin
 * @subpackage  Fields.media
 *
 * @copyright   (C) 2017 Open Source Matters, Inc.
<https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see
LICENSE.txt
 */

namespace Joomla\Plugin\Fields\Media\Extension;

use Joomla\CMS\Form\Form;
use Joomla\Component\Fields\Administrator\Plugin\FieldsPlugin;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Fields Media Plugin
 *
 * @since  3.7.0
 */
final class Media extends FieldsPlugin
{
    /**
     * Transforms the field into a DOM XML element and appends it as a
child on the given parent.
     *
     * @param   \stdClass    $field   The field.
     * @param   \DOMElement  $parent  The field node parent.
     * @param   Form         $form    The form.
     *
     * @return  ?\DOMElement
     *
     * @since   4.0.0
     */
    public function onCustomFieldsPrepareDom($field, \DOMElement $parent,
Form $form)
    {
        $fieldNode = parent::onCustomFieldsPrepareDom($field, $parent,
$form);

        if (!$fieldNode) {
            return $fieldNode;
        }

        $fieldNode->setAttribute('type',
'accessiblemedia');

        if
($this->getApplication()->getIdentity()->authorise('core.create',
'com_media')) {
            $fieldNode->setAttribute('disabled',
'false');
        }

        return $fieldNode;
    }

    /**
     * Before prepares the field value.
     *
     * @param   string     $context  The context.
     * @param   \stdclass  $item     The item.
     * @param   \stdclass  $field    The field.
     *
     * @return  void
     *
     * @since   4.0.0
     */
    public function onCustomFieldsBeforePrepareField($context, $item,
$field)
    {
        // Check if the field should be processed by us
        if (!$this->isTypeSupported($field->type)) {
            return;
        }

        // Check if the field value is an old (string) value
        $field->value = $this->checkValue($field->value);
    }

    /**
     * Before prepares the field value.
     *
     * @param   string  $value  The value to check.
     *
     * @return  array  The checked value
     *
     * @since   4.0.0
     */
    private function checkValue($value)
    {
        json_decode($value);

        if (json_last_error() === JSON_ERROR_NONE) {
            return (array) json_decode($value, true);
        }

        return ['imagefile' => $value, 'alt_text'
=> ''];
    }
}