<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Contracts\Translation;

use Symfony\Component\Translation\Exception\InvalidArgumentException;

/**
 * A trait to help implement TranslatorInterface and LocaleAwareInterface.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
trait TranslatorTrait
{
    private $locale;

    /**
     * {@inheritdoc}
     */
    public function setLocale(string $locale)
    {
        $this->locale = $locale;
    }

    /**
     * {@inheritdoc}
     *
     * @return string
     */
    public function getLocale()
    {
        return $this->locale ?: (class_exists(\Locale::class) ? \Locale::getDefault() : 'en');
    }

    /**
     * {@inheritdoc}
     */
    public function trans(?string $id, array $parameters = [], ?string $domain = null, ?string $locale = null): string
    {
        if (null === $id || '' === $id) {
            return '';
        }

        if (!isset($parameters['%count%']) || !is_numeric($parameters['%count%'])) {
            return strtr($id, $parameters);
        }

        $number = (float) $parameters['%count%'];
        $locale = $locale ?: $this->getLocale();

        $parts = [];
        if (preg_match('/^\|++$/', $id)) {
            $parts = explode('|', $id);
        } elseif (preg_match_all('/(?:\|\||[^\|])++/', $id, $matches)) {
            $parts = $matches[0];
        }

        $intervalRegexp = <<<'EOF'
/^(?P<interval>
    ({\s*
        (\-?\d+(\.\d+)?[\s*,\s*\-?\d+(\.\d+)?]*)
    \s*})

        |

    (?P<left_delimiter>[\[\]])
        \s*
        (?P<left>-Inf|\-?\d+(\.\d+)?)
        \s*,\s*
        (?P<right>\+?Inf|\-?\d+(\.\d+)?)
        \s*
    (?P<right_delimiter>[\[\]])
)\s*(?P<message>.*?)$/xs
EOF;

        $standardRules = [];
        foreach ($parts as $part) {
            $part = trim(str_replace('||', '|', $part));

            // try to match an explicit rule, then fallback to the standard ones
            if (preg_match($intervalRegexp, $part, $matches)) {
                if ($matches[2]) {
                    foreach (explode(',', $matches[3]) as $n) {
                        if ($number == $n) {
                            return strtr($matches['message'], $parameters);
                        }
                    }
                } else {
                    $leftNumber = '-Inf' === $matches['left'] ? -\INF : (float) $matches['left'];
                    $rightNumber = is_numeric($matches['right']) ? (float) $matches['right'] : \INF;

                    if (('[' === $matches['left_delimiter'] ? $number >= $leftNumber : $number > $leftNumber)
                        && (']' === $matches['right_delimiter'] ? $number <= $rightNumber : $number < $rightNumber)
                    ) {
                        return strtr($matches['message'], $parameters);
                    }
                }
            } elseif (preg_match('/^\w+\:\s*(.*?)$/', $part, $matches)) {
                $standardRules[] = $matches[1];
            } else {
                $standardRules[] = $part;
            }
        }

        $position = $this->getPluralizationRule($number, $locale);

        if (!isset($standardRules[$position])) {
            // when there's exactly one rule given, and that rule is a standard
            // rule, use this rule
            if (1 === \count($parts) && isset($standardRules[0])) {
                return strtr($standardRules[0], $parameters);
            }

            $message = sprintf('Unable to choose a translation for "%s" with locale "%s" for value "%d". Double check that this translation has the correct plural options (e.g. "There is one apple|There are %%count%% apples").', $id, $locale, $number);

            if (class_exists(InvalidArgumentException::class)) {
                throw new InvalidArgumentException($message);
            }

            throw new \InvalidArgumentException($message);
        }

        return strtr($standardRules[$position], $parameters);
    }

    /**
     * Returns the plural position to use for the given locale and number.
     *
     * The plural rules are derived from code of the Zend Framework (2010-09-25),
     * which is subject to the new BSD license (http://framework.zend.com/license/new-bsd).
     * Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
     */
    private function getPluralizationRule(float $number, string $locale): int
    {
        $number = abs($number);

        switch ('pt_BR' !== $locale && 'en_US_POSIX' !== $locale && \strlen($locale) > 3 ? substr($locale, 0, strrpos($locale, '_')) : $locale) {
            case 'af':
            case 'bn':
            case 'bg':
            case 'ca':
            case 'da':
            case 'de':
            case 'el':
            case 'en':
            case 'en_US_POSIX':
            case 'eo':
            case 'es':
            case 'et':
            case 'eu':
            case 'fa':
            case 'fi':
            case 'fo':
            case 'fur':
            case 'fy':
            case 'gl':
            case 'gu':
            case 'ha':
            case 'he':
            case 'hu':
            case 'is':
            case 'it':
            case 'ku':
            case 'lb':
            case 'ml':
            case 'mn':
            case 'mr':
            case 'nah':
            case 'nb':
            case 'ne':
            case 'nl':
            case 'nn':
            case 'no':
            case 'oc':
            case 'om':
            case 'or':
            case 'pa':
            case 'pap':
            case 'ps':
            case 'pt':
            case 'so':
            case 'sq':
            case 'sv':
            case 'sw':
            case 'ta':
            case 'te':
            case 'tk':
            case 'ur':
            case 'zu':
                return (1 == $number) ? 0 : 1;

            case 'am':
            case 'bh':
            case 'fil':
            case 'fr':
            case 'gun':
            case 'hi':
            case 'hy':
            case 'ln':
            case 'mg':
            case 'nso':
            case 'pt_BR':
            case 'ti':
            case 'wa':
                return ($number < 2) ? 0 : 1;

            case 'be':
            case 'bs':
            case 'hr':
            case 'ru':
            case 'sh':
            case 'sr':
            case 'uk':
                return ((1 == $number % 10) && (11 != $number % 100)) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);

            case 'cs':
            case 'sk':
                return (1 == $number) ? 0 : ((($number >= 2) && ($number <= 4)) ? 1 : 2);

            case 'ga':
                return (1 == $number) ? 0 : ((2 == $number) ? 1 : 2);

            case 'lt':
                return ((1 == $number % 10) && (11 != $number % 100)) ? 0 : ((($number % 10 >= 2) && (($number % 100 < 10) || ($number % 100 >= 20))) ? 1 : 2);

            case 'sl':
                return (1 == $number % 100) ? 0 : ((2 == $number % 100) ? 1 : (((3 == $number % 100) || (4 == $number % 100)) ? 2 : 3));

            case 'mk':
                return (1 == $number % 10) ? 0 : 1;

            case 'mt':
                return (1 == $number) ? 0 : (((0 == $number) || (($number % 100 > 1) && ($number % 100 < 11))) ? 1 : ((($number % 100 > 10) && ($number % 100 < 20)) ? 2 : 3));

            case 'lv':
                return (0 == $number) ? 0 : (((1 == $number % 10) && (11 != $number % 100)) ? 1 : 2);

            case 'pl':
                return (1 == $number) ? 0 : ((($number % 10 >= 2) && ($number % 10 <= 4) && (($number % 100 < 12) || ($number % 100 > 14))) ? 1 : 2);

            case 'cy':
                return (1 == $number) ? 0 : ((2 == $number) ? 1 : (((8 == $number) || (11 == $number)) ? 2 : 3));

            case 'ro':
                return (1 == $number) ? 0 : (((0 == $number) || (($number % 100 > 0) && ($number % 100 < 20))) ? 1 : 2);

            case 'ar':
                return (0 == $number) ? 0 : ((1 == $number) ? 1 : ((2 == $number) ? 2 : ((($number % 100 >= 3) && ($number % 100 <= 10)) ? 3 : ((($number % 100 >= 11) && ($number % 100 <= 99)) ? 4 : 5))));

            default:
                return 0;
        }
    }
}
