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

namespace Magento\Framework\View\PageLayout;

/**
* Page layouts configuration
*/
class Config extends \Magento\Framework\Config\AbstractXml
{
/**
* @var \Magento\Framework\Config\Dom\UrnResolver
*/
protected $urnResolver;

/**
* Instantiate with the list of files to merge
*
* @param array $configFiles
* @param \Magento\Framework\Config\DomFactory $domFactory
* @param \Magento\Framework\Config\Dom\UrnResolver $urnResolver
* @throws \InvalidArgumentException
*/
public function __construct(
$configFiles,
\Magento\Framework\Config\DomFactory $domFactory,
\Magento\Framework\Config\Dom\UrnResolver $urnResolver
) {
$this->urnResolver = $urnResolver;
parent::__construct($configFiles, $domFactory);
}

/**
* Get absolute path to the XML-schema file
*
* @return string
*/
public function getSchemaFile()
{
return $this->urnResolver->getRealPath('urn:magento:framework:View/PageLayout/etc/layouts.xsd');
}

/**
* Get page layout that contains declared in system
*
* @return string[][]
*/
public function getPageLayouts()
{
return $this->_data;
}

/**
* Checks that the page layout declared in configuration
*
* @param string $pageLayout
* @return bool
*/
public function hasPageLayout($pageLayout)
{
return isset($this->_data[$pageLayout]);
}

/**
* Retrieve page layout options
*
* @return array
*/
public function getOptions()
{
return $this->getPageLayouts();
}

/**
* @param bool $withEmpty
* @return array
*/
public function toOptionArray($withEmpty = false)
{
$options = [];
foreach ($this->getPageLayouts() as $value => $label) {
$options[] = ['label' => $label, 'value' => $value];
}

if ($withEmpty) {
array_unshift($options, [
'value' => '',
'label' => (string)new \Magento\Framework\Phrase('-- Please Select --')
]);
}
return $options;
}

/**
* Extract configuration data from the DOM structure
*
* @param \DOMDocument $dom
* @return array
*/
protected function _extractData(\DOMDocument $dom)
{
$result = [];

/** @var \DOMElement $layout */
foreach ($dom->getElementsByTagName('layout') as $layout) {
$result[$layout->getAttribute('id')] = trim($layout->nodeValue);
}
return $result;
}

/**
* Get XML-contents, initial for merging
*
* @return string
*/
protected function _getInitialXml()
{
return '<?xml version="1.0" encoding="UTF-8"?>'
. '<page_layouts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></page_layouts>';
}

/**
* Get list of paths to identifiable nodes
*
* @return array
*/
protected function _getIdAttributes()
{
return [
'/page_layouts/layout' => 'id'
];
}
}