<?php

namespace App\Services;

class LocaleGuard
{
    /**
     * @return array<int, string>
     */
    public static function supportedLocaleCodes(): array
    {
        return array_keys(config('localization.supportedLocales'));
    }

    public static function isSupported(string $locale): bool
    {
        return in_array(strtolower($locale), self::supportedLocaleCodes(), true);
    }

    public static function normalize(?string $locale): ?string
    {
        if ($locale === null || $locale === '') {
            return null;
        }

        $lower = strtolower($locale);

        return self::isSupported($lower) ? $lower : null;
    }
}