<?php
/**
 * This file is part of Phraseanet
 *
 * (c) 2005-2016 Alchemy
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Alchemy\Phrasea\SearchEngine\Elastic;

use Cocur\Slugify\Slugify;
use Cocur\Slugify\SlugifyInterface;
use Transliterator;

class StringUtils
{
    /**
     * @var SlugifyInterface|null
     */
    private static $slugifier;

    private static $transliterator;

    /**
     * Prevent instantiation of the class
     */
    private function __construct()
    {
    }

    public static function setSlugify(SlugifyInterface $slugify = null)
    {
        self::$slugifier = $slugify;
    }

    /**
     * @return SlugifyInterface
     */
    private static function getSlugifier()
    {
        if (null === self::$slugifier) {
            self::$slugifier = new Slugify();
        }

        return self::$slugifier;
    }

    public static function slugify($string, $separator = '-')
    {
        return self::getSlugifier()->slugify($string, $separator);
    }

    public static function asciiLowerFold($string)
    {
        // '北京' -> 'bei jing'

        if (!self::$transliterator) {
            $id = 'Any-Latin; Latin-ASCII; Any-Lower';
            self::$transliterator = Transliterator::create($id);
        }

        return self::$transliterator->transliterate($string);
    }

    /**
     * replace bad chars (ascii 0...31 except 9,10,13)
     *
     * @param $s
     * @param string $replace
     * @return mixed
     */
    public static function substituteCtrlCharacters($s, $replace = '_')
    {
        static $bad_chars = null;
        if($bad_chars === null) {
            $bad_chars = [];
            for($i=0; $i<32; $i++) {
                if($i != 9 && $i != 10 && $i != 13) {
                    $bad_chars[] = chr($i);
                }
            }
        }

        return str_replace($bad_chars, $replace, $s);
    }
}