<?php

namespace Illuminate\Translation;

use Illuminate\Support\Str;

class MessageSelector
{
    /**
     * Select a proper translation string based on the given number.
     *
     * @param  string  $line
     * @param  int  $number
     * @param  string  $locale
     * @return mixed
     */
    public function choose($line, $number, $locale)
    {
        $segments = explode('|', $line);

        if (($value = $this->extract($segments, $number)) !== null) {
            return trim($value);
        }

        $segments = $this->stripConditions($segments);

        $pluralIndex = $this->getPluralIndex($locale, $number);

        if (count($segments) === 1 || ! isset($segments[$pluralIndex])) {
            return $segments[0];
        }

        return $segments[$pluralIndex];
    }

    /**
     * Extract a translation string using inline conditions.
     *
     * @param  array  $segments
     * @param  int  $number
     * @return mixed
     */
    private function extract($segments, $number)
    {
        foreach ($segments as $part) {
            if (! is_null($line = $this->extractFromString($part, $number))) {
                return $line;
            }
        }
    }

    /**
     * Get the translation string if the condition matches.
     *
     * @param  string  $part
     * @param  int  $number
     * @return mixed
     */
    private function extractFromString($part, $number)
    {
        preg_match('/^[\{\[]([^\[\]\{\}]*)[\}\]](.*)/s', $part, $matches);

        if (count($matches) !== 3) {
            return null;
        }

        $condition = $matches[1];

        $value = $matches[2];

        if (Str::contains($condition, ',')) {
            [$from, $to] = explode(',', $condition, 2);

            if ($to === '*' && $number >= $from) {
                return $value;
            } elseif ($from === '*' && $number <= $to) {
                return $value;
            } elseif ($number >= $from && $number <= $to) {
                return $value;
            }
        }

        return $condition == $number ? $value : null;
    }

    /**
     * Strip the inline conditions from each segment, just leaving the text.
     *
     * @param  array  $segments
     * @return array
     */
    private function stripConditions($segments)
    {
        return collect($segments)->map(function ($part) {
            return preg_replace('/^[\{\[]([^\[\]\{\}]*)[\}\]]/', '', $part);
        })->all();
    }

    /**
     * Get the index to use for pluralization.
     *
     * The plural rules are derived from code of the Zend Framework (2010-09-25), which
     * is subject to the new BSD license (https://framework.zend.com/license)
     * Copyright (c) 2005-2010 - Zend Technologies USA Inc. (http://www.zend.com)
     *
     * @param  string  $locale
     * @param  int  $number
     * @return int
     */
    public function getPluralIndex($locale, $number)
    {
        switch ($locale) {
            case 'az':
            case 'az_AZ':
            case 'bo':
            case 'bo_CN':
            case 'bo_IN':
            case 'dz':
            case 'dz_BT':
            case 'id':
            case 'id_ID':
            case 'ja':
            case 'ja_JP':
            case 'jv':
            case 'ka':
            case 'ka_GE':
            case 'km':
            case 'km_KH':
            case 'kn':
            case 'kn_IN':
            case 'ko':
            case 'ko_KR':
            case 'ms':
            case 'ms_MY':
            case 'th':
            case 'th_TH':
            case 'tr':
            case 'tr_CY':
            case 'tr_TR':
            case 'vi':
            case 'vi_VN':
            case 'zh':
            case 'zh_CN':
            case 'zh_HK':
            case 'zh_SG':
            case 'zh_TW':
                return 0;
            case 'af':
            case 'af_ZA':
            case 'bn':
            case 'bn_BD':
            case 'bn_IN':
            case 'bg':
            case 'bg_BG':
            case 'ca':
            case 'ca_AD':
            case 'ca_ES':
            case 'ca_FR':
            case 'ca_IT':
            case 'da':
            case 'da_DK':
            case 'de':
            case 'de_AT':
            case 'de_BE':
            case 'de_CH':
            case 'de_DE':
            case 'de_LI':
            case 'de_LU':
            case 'el':
            case 'el_CY':
            case 'el_GR':
            case 'en':
            case 'en_AG':
            case 'en_AU':
            case 'en_BW':
            case 'en_CA':
            case 'en_DK':
            case 'en_GB':
            case 'en_HK':
            case 'en_IE':
            case 'en_IN':
            case 'en_NG':
            case 'en_NZ':
            case 'en_PH':
            case 'en_SG':
            case 'en_US':
            case 'en_ZA':
            case 'en_ZM':
            case 'en_ZW':
            case 'eo':
            case 'eo_US':
            case 'es':
            case 'es_AR':
            case 'es_BO':
            case 'es_CL':
            case 'es_CO':
            case 'es_CR':
            case 'es_CU':
            case 'es_DO':
            case 'es_EC':
            case 'es_ES':
            case 'es_GT':
            case 'es_HN':
            case 'es_MX':
            case 'es_NI':
            case 'es_PA':
            case 'es_PE':
            case 'es_PR':
            case 'es_PY':
            case 'es_SV':
            case 'es_US':
            case 'es_UY':
            case 'es_VE':
            case 'et':
            case 'et_EE':
            case 'eu':
            case 'eu_ES':
            case 'eu_FR':
            case 'fa':
            case 'fa_IR':
            case 'fi':
            case 'fi_FI':
            case 'fo':
            case 'fo_FO':
            case 'fur':
            case 'fur_IT':
            case 'fy':
            case 'fy_DE':
            case 'fy_NL':
            case 'gl':
            case 'gl_ES':
            case 'gu':
            case 'gu_IN':
            case 'ha':
            case 'ha_NG':
            case 'he':
            case 'he_IL':
            case 'hu':
            case 'hu_HU':
            case 'is':
            case 'is_IS':
            case 'it':
            case 'it_CH':
            case 'it_IT':
            case 'ku':
            case 'ku_TR':
            case 'lb':
            case 'lb_LU':
            case 'ml':
            case 'ml_IN':
            case 'mn':
            case 'mn_MN':
            case 'mr':
            case 'mr_IN':
            case 'nah':
            case 'nb':
            case 'nb_NO':
            case 'ne':
            case 'ne_NP':
            case 'nl':
            case 'nl_AW':
            case 'nl_BE':
            case 'nl_NL':
            case 'nn':
            case 'nn_NO':
            case 'no':
            case 'om':
            case 'om_ET':
            case 'om_KE':
            case 'or':
            case 'or_IN':
            case 'pa':
            case 'pa_IN':
            case 'pa_PK':
            case 'pap':
            case 'pap_AN':
            case 'pap_AW':
            case 'pap_CW':
            case 'ps':
            case 'ps_AF':
            case 'pt':
            case 'pt_BR':
            case 'pt_PT':
            case 'so':
            case 'so_DJ':
            case 'so_ET':
            case 'so_KE':
            case 'so_SO':
            case 'sq':
            case 'sq_AL':
            case 'sq_MK':
            case 'sv':
            case 'sv_FI':
            case 'sv_SE':
            case 'sw':
            case 'sw_KE':
            case 'sw_TZ':
            case 'ta':
            case 'ta_IN':
            case 'ta_LK':
            case 'te':
            case 'te_IN':
            case 'tk':
            case 'tk_TM':
            case 'ur':
            case 'ur_IN':
            case 'ur_PK':
            case 'zu':
            case 'zu_ZA':
                return ($number == 1) ? 0 : 1;
            case 'am':
            case 'am_ET':
            case 'bh':
            case 'fil':
            case 'fil_PH':
            case 'fr':
            case 'fr_BE':
            case 'fr_CA':
            case 'fr_CH':
            case 'fr_FR':
            case 'fr_LU':
            case 'gun':
            case 'hi':
            case 'hi_IN':
            case 'hy':
            case 'hy_AM':
            case 'ln':
            case 'ln_CD':
            case 'mg':
            case 'mg_MG':
            case 'nso':
            case 'nso_ZA':
            case 'ti':
            case 'ti_ER':
            case 'ti_ET':
            case 'wa':
            case 'wa_BE':
            case 'xbr':
                return (($number == 0) || ($number == 1)) ? 0 : 1;
            case 'be':
            case 'be_BY':
            case 'bs':
            case 'bs_BA':
            case 'hr':
            case 'hr_HR':
            case 'ru':
            case 'ru_RU':
            case 'ru_UA':
            case 'sr':
            case 'sr_ME':
            case 'sr_RS':
            case 'uk':
            case 'uk_UA':
                return (($number % 10 == 1) && ($number % 100 != 11)) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);
            case 'cs':
            case 'cs_CZ':
            case 'sk':
            case 'sk_SK':
                return ($number == 1) ? 0 : ((($number >= 2) && ($number <= 4)) ? 1 : 2);
            case 'ga':
            case 'ga_IE':
                return ($number == 1) ? 0 : (($number == 2) ? 1 : 2);
            case 'lt':
            case 'lt_LT':
                return (($number % 10 == 1) && ($number % 100 != 11)) ? 0 : ((($number % 10 >= 2) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);
            case 'sl':
            case 'sl_SI':
                return ($number % 100 == 1) ? 0 : (($number % 100 == 2) ? 1 : ((($number % 100 == 3) || ($number % 100 == 4)) ? 2 : 3));
            case 'mk':
            case 'mk_MK':
                return ($number % 10 == 1) ? 0 : 1;
            case 'mt':
            case 'mt_MT':
                return ($number == 1) ? 0 : ((($number == 0) || (($number % 100 > 1) && ($number % 100 < 11))) ? 1 : ((($number % 100 > 10) && ($number % 100 < 20)) ? 2 : 3));
            case 'lv':
            case 'lv_LV':
                return ($number == 0) ? 0 : ((($number % 10 == 1) && ($number % 100 != 11)) ? 1 : 2);
            case 'pl':
            case 'pl_PL':
                return ($number == 1) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 12) || ($number % 100 > 14))) ? 1 : 2);
            case 'cy':
            case 'cy_GB':
                return ($number == 1) ? 0 : (($number == 2) ? 1 : ((($number == 8) || ($number == 11)) ? 2 : 3));
            case 'ro':
            case 'ro_RO':
                return ($number == 1) ? 0 : ((($number == 0) || (($number % 100 > 0) && ($number % 100 < 20))) ? 1 : 2);
            case 'ar':
            case 'ar_AE':
            case 'ar_BH':
            case 'ar_DZ':
            case 'ar_EG':
            case 'ar_IN':
            case 'ar_IQ':
            case 'ar_JO':
            case 'ar_KW':
            case 'ar_LB':
            case 'ar_LY':
            case 'ar_MA':
            case 'ar_OM':
            case 'ar_QA':
            case 'ar_SA':
            case 'ar_SD':
            case 'ar_SS':
            case 'ar_SY':
            case 'ar_TN':
            case 'ar_YE':
                return ($number == 0) ? 0 : (($number == 1) ? 1 : (($number == 2) ? 2 : ((($number % 100 >= 3) && ($number % 100 <= 10)) ? 3 : ((($number % 100 >= 11) && ($number % 100 <= 99)) ? 4 : 5))));
            default:
                return 0;
        }
    }
}