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<?php
/**
 * Mirasvit
 *
 * This source file is subject to the Mirasvit Software License, which is available at https://mirasvit.com/license/.
 * Do not edit or add to this file if you wish to upgrade the to newer versions in the future.
 * If you wish to customize this module for your needs.
 * Please refer to http://www.magentocommerce.com for more information.
 *
 * @category  Mirasvit
 * @package   mirasvit/module-search-ultimate
 * @version   2.2.35
 * @copyright Copyright (C) 2024 Mirasvit (https://mirasvit.com/)
 */



namespace Mirasvit\SearchSphinx\SphinxQL\Stemming;

class Ru
{
    private $vowel             = "аеёиоуыэюя";

    private $regexPerfectiveGerunds
                               = [
            "(в|вши|вшись)$",
            "(ив|ивши|ившись|ыв|ывши|ывшись)$",
        ];

    private $regexAdjective
                               = "(ее|ие|ые|ое|ими|ыми|ей|ий|ый|ой|ем|им|"
        . "ым|ом|его|ого|ему|ому|их|ых|ую|юю|ая|яя|ою|ею)$";

    private $regexParticiple
                               = [
            "(ем|нн|вш|ющ|щ)",
            "(ивш|ывш|ующ)",
        ];

    private $regexReflexives   = "(ся|сь)$";

    private $regexVerb
                               = [
            "(ла|на|ете|йте|ли|й|л|ем|н|"
            . "ло|но|ет|ют|ны|ть|ешь|нно)$",
            "(ила|ыла|ена|ейте|уйте|ите|или|ыли|ей|уй|ил|ыл|им|ым|ен|"
            . "ило|ыло|ено|ят|ует|уют|ит|ыт|ены|ить|ыть|ишь|ую|ю)$",
        ];

    private $regexNoun
                               = "(а|ев|ов|ие|ье|е|иями|ями|ами|еи|ии|и|ией|ей|ой|ий|й|"
        . "иям|ям|ием|ем|ам|ом|о|у|ах|иях|ях|ы|ь|ию|ью|ю|ия|ья|я)$";

    private $regexSuperlative  = "(ейш|ейше)$";

    private $regexDerivational = "(ост|ость)$";

    private $regexI            = "и$";

    private $regexNN           = "нн$";

    private $regexSoftSign     = "ь$";

    private $word              = '';

    private $RV                = 0;

    private $R2                = 0;

    public function singularize(string $word): string
    {
        mb_internal_encoding('UTF-8');
        $this->word = $word;
        $this->findRegions();
        if (!$this->removeEndings($this->regexPerfectiveGerunds, $this->RV)) {
            $this->removeEndings($this->regexReflexives, $this->RV);
            if (!($this->removeEndings(
                    [
                        $this->regexParticiple[0] . $this->regexAdjective,
                        $this->regexParticiple[1] . $this->regexAdjective,
                    ],
                    $this->RV
                ) || $this->removeEndings($this->regexAdjective, $this->RV))
            ) {
                if (!$this->removeEndings($this->regexVerb, $this->RV)) {
                    $this->removeEndings($this->regexNoun, $this->RV);
                }
            }
        }

        $this->removeEndings($this->regexI, $this->RV);
        $this->removeEndings($this->regexDerivational, $this->R2);
        if ($this->removeEndings($this->regexNN, $this->RV)) {
            $this->word .= 'н';
        }
        $this->removeEndings($this->regexSuperlative, $this->RV);
        $this->removeEndings($this->regexSoftSign, $this->RV);

        return $this->word;
    }

    /**
     * @param array|string $regex
     */
    public function removeEndings($regex, int $region): bool
    {
        $prefix = mb_substr($this->word, 0, $region, 'utf8');
        $word   = substr($this->word, strlen($prefix));
        if (is_array($regex)) {
            if (preg_match('/.+[а|я]' . $regex[0] . '/u', $word)) {
                $this->word = $prefix . preg_replace('/' . $regex[0] . '/u', '', $word);

                return true;
            }
            $regex = $regex[1];
        }
        if (preg_match('/.+' . $regex . '/u', $word)) {
            $this->word = $prefix . preg_replace('/' . $regex . '/u', '', $word);

            return true;
        }

        return false;
    }

    private function findRegions(): void
    {
        $state      = 0;
        $wordLength = mb_strlen($this->word, 'utf8');
        for ($i = 1; $i < $wordLength; $i++) {
            $prevChar = mb_substr($this->word, $i - 1, 1, 'utf8');
            $char     = mb_substr($this->word, $i, 1, 'utf8');
            switch ($state) {
                case 0:
                    if ($this->isVowel($char)) {
                        $this->RV = $i + 1;
                        $state    = 1;
                    }
                    break;
                case 1:
                    if ($this->isVowel($prevChar) && !$this->isVowel($char)) {
                        $state = 2;
                    }
                    break;
                case 2:
                    if ($this->isVowel($prevChar) && !$this->isVowel($char)) {
                        $this->R2 = $i + 1;

                        return;
                    }
                    break;
            }
        }
    }

    private function isVowel(string $char): bool
    {
        return (strpos($this->vowel, $char) !== false);
    }
}