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

use Magento\Framework\Exception\LocalizedException;

/**
* Read config from different sources and aggregate them
*
* @package Magento\Framework\Config
*/
class Reader implements \Magento\Framework\App\Config\Scope\ReaderInterface
{
/**
* @var array
*/
private $sources;

/**
* @param array $sources
*/
public function __construct(array $sources)
{
$this->sources = $this->prepareSources($sources);
}

/**
* Read configuration data
*
* @param null|string $scope
* @throws LocalizedException Exception is thrown when scope other than default is given
* @return array
*/
public function read($scope = null)
{
$config = [];
foreach ($this->sources as $sourceData) {
/** @var \Magento\Framework\App\Config\Reader\Source\SourceInterface $source */
$source = $sourceData['class'];
$config = array_replace_recursive($config, $source->get($scope));
}

return $config;
}

/**
* Prepare source for usage
*
* @param array $array
* @return array
*/
private function prepareSources(array $array)
{
$array = array_filter(
$array,
function ($item) {
return (!isset($item['disable']) || !$item['disable']) && $item['class'];
}
);
uasort(
$array,
function ($firstItem, $nexItem) {
return (int)$firstItem['sortOrder'] <=> (int)$nexItem['sortOrder'];
}
);

return $array;
}
}