<?php

declare(strict_types=1);

namespace Dotclear\Plugin\cleanURLs;

use Dotclear\Interface\Core\BlogInterface;
use Dotclear\Database\Cursor;

/**
 * @brief       cleanURLs main class.
 * @ingroup     cleanURLs
 *
 * @author      Pierre Rudloff (author)
 * @author      Jean-Christian Denis (latest)
 * @copyright   GPL-3.0 https://www.gnu.org/licenses/gpl-3.0.html
 */
class CleanURLs
{
    /**
     * Chars to convert from.
     *
     * @var     string  CONVERT_FROM_CHARS
     */
    public const CONVERT_FROM_CHARS = ',!.?;:@$«»°*';

    /**
     * Chars to convert to.
     *
     * @var     string  CONVERT_TO_CHAR
     */
    public const CONVERT_TO_CHAR = '-';

    /**
     * List of special chars to convert.
     *
     * @var     string  $convert_from_chars
     */
    public static string $convert_from_chars = self::CONVERT_FROM_CHARS;

    /**
     * A char to convert to.
     *
     * @var     string  $convert_to_char
     */
    public static string $convert_to_char = self::CONVERT_TO_CHAR;

    /**
     * Reset to default values.
     */
    public static function reset(): void
    {
        self::$convert_from_chars = self::CONVERT_FROM_CHARS;
        self::$convert_to_char    = self::CONVERT_TO_CHAR;
    }

    /**
     * Convert specials chars to a another char.
     *
     * @param   null|string     $str    The string
     *
     * @return  null|string     The converted string
     */
    public static function charsToChar(?string $str): ?string
    {
        return is_null($str) || strlen(self::$convert_to_char) != 1 ? $str :
            str_replace(str_split(self::$convert_from_chars), self::$convert_to_char, $str);
    }

    /**
     * Check if a string is UTF-8
     *
     * @author  WordPress
     * @license https://wordpress.org/about/gpl/ GPLv2
     *
     * @param   string  $str    The string to check
     *
     * @return  bool
     * */
    public static function seemsUtf8(string $str): bool
    {
        $length = strlen($str);
        for ($i = 0; $i < $length; $i++) {
            $c = ord($str[$i]);
            if ($c < 0x80) {
                $n = 0; // 0bbbbbbb
            } elseif (($c & 0xE0) == 0xC0) {
                $n = 1; // 110bbbbb
            } elseif (($c & 0xF0) == 0xE0) {
                $n = 2; // 1110bbbb
            } elseif (($c & 0xF8) == 0xF0) {
                $n = 3; // 11110bbb
            } elseif (($c & 0xFC) == 0xF8) {
                $n = 4; // 111110bb
            } elseif (($c & 0xFE) == 0xFC) {
                $n = 5; // 1111110b
            } else {
                return false; // Does not match any model
            }
            for ($j = 0; $j < $n; $j++) { // n bytes matching 10bbbbbb follow ?
                if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80)) {
                    return false;
                }
            }
        }

        return true;
    }

    /**
     * Converts all accent characters to ASCII characters.
     *
     * If there are no accent characters, then the string given is just returned.
     *
     * @author  WordPress
     * @license https://wordpress.org/about/gpl/ GPLv2
     *
     * @param   string  $string     Text that might have accent characters
     *
     * @return  string  Filtered string with replaced "nice" characters.
     */
    public static function removeAccents(string $string): string
    {
        if (!preg_match('/[\x80-\xff]/', $string)) {
            return $string;
        }

        if (self::seemsUtf8($string)) {
            $chars = [
                // Decompositions for Latin-1 Supplement
                chr(195) . chr(128) => 'A', chr(195) . chr(129) => 'A',
                chr(195) . chr(130) => 'A', chr(195) . chr(131) => 'A',
                chr(195) . chr(132) => 'A', chr(195) . chr(133) => 'A',
                chr(195) . chr(135) => 'C', chr(195) . chr(136) => 'E',
                chr(195) . chr(137) => 'E', chr(195) . chr(138) => 'E',
                chr(195) . chr(139) => 'E', chr(195) . chr(140) => 'I',
                chr(195) . chr(141) => 'I', chr(195) . chr(142) => 'I',
                chr(195) . chr(143) => 'I', chr(195) . chr(145) => 'N',
                chr(195) . chr(146) => 'O', chr(195) . chr(147) => 'O',
                chr(195) . chr(148) => 'O', chr(195) . chr(149) => 'O',
                chr(195) . chr(150) => 'O', chr(195) . chr(153) => 'U',
                chr(195) . chr(154) => 'U', chr(195) . chr(155) => 'U',
                chr(195) . chr(156) => 'U', chr(195) . chr(157) => 'Y',
                chr(195) . chr(159) => 's', chr(195) . chr(160) => 'a',
                chr(195) . chr(161) => 'a', chr(195) . chr(162) => 'a',
                chr(195) . chr(163) => 'a', chr(195) . chr(164) => 'a',
                chr(195) . chr(165) => 'a', chr(195) . chr(167) => 'c',
                chr(195) . chr(168) => 'e', chr(195) . chr(169) => 'e',
                chr(195) . chr(170) => 'e', chr(195) . chr(171) => 'e',
                chr(195) . chr(172) => 'i', chr(195) . chr(173) => 'i',
                chr(195) . chr(174) => 'i', chr(195) . chr(175) => 'i',
                chr(195) . chr(177) => 'n', chr(195) . chr(178) => 'o',
                chr(195) . chr(179) => 'o', chr(195) . chr(180) => 'o',
                chr(195) . chr(181) => 'o', chr(195) . chr(182) => 'o',
                chr(195) . chr(182) => 'o', chr(195) . chr(185) => 'u',
                chr(195) . chr(186) => 'u', chr(195) . chr(187) => 'u',
                chr(195) . chr(188) => 'u', chr(195) . chr(189) => 'y',
                chr(195) . chr(191) => 'y',
                // Decompositions for Latin Extended-A
                chr(196) . chr(128) => 'A', chr(196) . chr(129) => 'a',
                chr(196) . chr(130) => 'A', chr(196) . chr(131) => 'a',
                chr(196) . chr(132) => 'A', chr(196) . chr(133) => 'a',
                chr(196) . chr(134) => 'C', chr(196) . chr(135) => 'c',
                chr(196) . chr(136) => 'C', chr(196) . chr(137) => 'c',
                chr(196) . chr(138) => 'C', chr(196) . chr(139) => 'c',
                chr(196) . chr(140) => 'C', chr(196) . chr(141) => 'c',
                chr(196) . chr(142) => 'D', chr(196) . chr(143) => 'd',
                chr(196) . chr(144) => 'D', chr(196) . chr(145) => 'd',
                chr(196) . chr(146) => 'E', chr(196) . chr(147) => 'e',
                chr(196) . chr(148) => 'E', chr(196) . chr(149) => 'e',
                chr(196) . chr(150) => 'E', chr(196) . chr(151) => 'e',
                chr(196) . chr(152) => 'E', chr(196) . chr(153) => 'e',
                chr(196) . chr(154) => 'E', chr(196) . chr(155) => 'e',
                chr(196) . chr(156) => 'G', chr(196) . chr(157) => 'g',
                chr(196) . chr(158) => 'G', chr(196) . chr(159) => 'g',
                chr(196) . chr(160) => 'G', chr(196) . chr(161) => 'g',
                chr(196) . chr(162) => 'G', chr(196) . chr(163) => 'g',
                chr(196) . chr(164) => 'H', chr(196) . chr(165) => 'h',
                chr(196) . chr(166) => 'H', chr(196) . chr(167) => 'h',
                chr(196) . chr(168) => 'I', chr(196) . chr(169) => 'i',
                chr(196) . chr(170) => 'I', chr(196) . chr(171) => 'i',
                chr(196) . chr(172) => 'I', chr(196) . chr(173) => 'i',
                chr(196) . chr(174) => 'I', chr(196) . chr(175) => 'i',
                chr(196) . chr(176) => 'I', chr(196) . chr(177) => 'i',
                chr(196) . chr(178) => 'IJ',chr(196) . chr(179) => 'ij',
                chr(196) . chr(180) => 'J', chr(196) . chr(181) => 'j',
                chr(196) . chr(182) => 'K', chr(196) . chr(183) => 'k',
                chr(196) . chr(184) => 'k', chr(196) . chr(185) => 'L',
                chr(196) . chr(186) => 'l', chr(196) . chr(187) => 'L',
                chr(196) . chr(188) => 'l', chr(196) . chr(189) => 'L',
                chr(196) . chr(190) => 'l', chr(196) . chr(191) => 'L',
                chr(197) . chr(128) => 'l', chr(197) . chr(129) => 'L',
                chr(197) . chr(130) => 'l', chr(197) . chr(131) => 'N',
                chr(197) . chr(132) => 'n', chr(197) . chr(133) => 'N',
                chr(197) . chr(134) => 'n', chr(197) . chr(135) => 'N',
                chr(197) . chr(136) => 'n', chr(197) . chr(137) => 'N',
                chr(197) . chr(138) => 'n', chr(197) . chr(139) => 'N',
                chr(197) . chr(140) => 'O', chr(197) . chr(141) => 'o',
                chr(197) . chr(142) => 'O', chr(197) . chr(143) => 'o',
                chr(197) . chr(144) => 'O', chr(197) . chr(145) => 'o',
                chr(197) . chr(146) => 'OE',chr(197) . chr(147) => 'oe',
                chr(197) . chr(148) => 'R',chr(197) . chr(149) => 'r',
                chr(197) . chr(150) => 'R',chr(197) . chr(151) => 'r',
                chr(197) . chr(152) => 'R',chr(197) . chr(153) => 'r',
                chr(197) . chr(154) => 'S',chr(197) . chr(155) => 's',
                chr(197) . chr(156) => 'S',chr(197) . chr(157) => 's',
                chr(197) . chr(158) => 'S',chr(197) . chr(159) => 's',
                chr(197) . chr(160) => 'S', chr(197) . chr(161) => 's',
                chr(197) . chr(162) => 'T', chr(197) . chr(163) => 't',
                chr(197) . chr(164) => 'T', chr(197) . chr(165) => 't',
                chr(197) . chr(166) => 'T', chr(197) . chr(167) => 't',
                chr(197) . chr(168) => 'U', chr(197) . chr(169) => 'u',
                chr(197) . chr(170) => 'U', chr(197) . chr(171) => 'u',
                chr(197) . chr(172) => 'U', chr(197) . chr(173) => 'u',
                chr(197) . chr(174) => 'U', chr(197) . chr(175) => 'u',
                chr(197) . chr(176) => 'U', chr(197) . chr(177) => 'u',
                chr(197) . chr(178) => 'U', chr(197) . chr(179) => 'u',
                chr(197) . chr(180) => 'W', chr(197) . chr(181) => 'w',
                chr(197) . chr(182) => 'Y', chr(197) . chr(183) => 'y',
                chr(197) . chr(184) => 'Y', chr(197) . chr(185) => 'Z',
                chr(197) . chr(186) => 'z', chr(197) . chr(187) => 'Z',
                chr(197) . chr(188) => 'z', chr(197) . chr(189) => 'Z',
                chr(197) . chr(190) => 'z', chr(197) . chr(191) => 's',
                // Euro Sign
                chr(226) . chr(130) . chr(172) => 'E',
                // GBP (Pound) Sign
                chr(194) . chr(163) => ''];

            $string = strtr($string, $chars);
        } else {
            // Assume ISO-8859-1 if not UTF-8
            $chars['in'] = chr(128) . chr(131) . chr(138) . chr(142) . chr(154) . chr(158)
                . chr(159) . chr(162) . chr(165) . chr(181) . chr(192) . chr(193) . chr(194)
                . chr(195) . chr(196) . chr(197) . chr(199) . chr(200) . chr(201) . chr(202)
                . chr(203) . chr(204) . chr(205) . chr(206) . chr(207) . chr(209) . chr(210)
                . chr(211) . chr(212) . chr(213) . chr(214) . chr(216) . chr(217) . chr(218)
                . chr(219) . chr(220) . chr(221) . chr(224) . chr(225) . chr(226) . chr(227)
                . chr(228) . chr(229) . chr(231) . chr(232) . chr(233) . chr(234) . chr(235)
                . chr(236) . chr(237) . chr(238) . chr(239) . chr(241) . chr(242) . chr(243)
                . chr(244) . chr(245) . chr(246) . chr(248) . chr(249) . chr(250) . chr(251)
                . chr(252) . chr(253) . chr(255);

            $chars['out'] = 'EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUY' .
                'aaaaaaceeeeiiiinoooooouuuuyy';

            $string             = strtr($string, $chars['in'], $chars['out']);
            $double_chars['in'] = [
                chr(140), chr(156), chr(198), chr(208), chr(222),
                chr(223), chr(230), chr(240), chr(254),
            ];
            $double_chars['out'] = [
                'OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th',
            ];
            $string = str_replace(
                $double_chars['in'],
                $double_chars['out'],
                $string
            );
        }

        return $string;
    }
    /**
     * Clean string from diacritics and punctuation.
     *
     * @param   null|string     $str    The string
     *
     * @return  null|string     The cleaned string
     * */
    public static function cleanStr(?string $str): ?string
    {
        return is_null($str) ? null : self::charsToChar(self::removeAccents($str));
    }

    /**
     * Clean post URLs from diacritics and punctuation.
     *
     * @param   Blog    $blog   The blog instance
     * @param   Cursor  $cur    The post Cursor
     * */
    public static function cleanPost(BlogInterface $blog, Cursor $cur): void
    {
        $cur->setField('post_url', self::cleanStr($cur->getField('post_url')));
    }
}