<?php

/*
 * This file is part of the HTML sanitizer project.
 *
 * (c) Titouan Galopin <galopintitouan@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace HtmlSanitizer\Bundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

/**
 * @author Titouan Galopin <galopintitouan@gmail.com>
 *
 * @internal
 */
class Configuration implements ConfigurationInterface
{
    /**
     * @return TreeBuilder
     */
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder('html_sanitizer');
        $rootNode = $this->getRootNode($treeBuilder, 'html_sanitizer');

        $rootNode
            ->children()
                ->scalarNode('default_sanitizer')->isRequired()->end()
                ->arrayNode('sanitizers')
                    ->isRequired()
                    ->useAttributeAsKey('name')
                    ->prototype('variable')->end()
                    ->defaultValue([])
                ->end()
            ->end()
        ;

        return $treeBuilder;
    }

    private function getRootNode(TreeBuilder $treeBuilder, $name)
    {
        // BC layer for symfony/config 4.1 and older
        if (!\method_exists($treeBuilder, 'getRootNode')) {
            return $treeBuilder->root($name);
        }

        return $treeBuilder->getRootNode();
    }
}