<?php

declare(strict_types=1);

namespace Kreait\Firebase\JWT;

use function in_array;

/**
 * @internal
 */
final class Util
{
    /**
     * @param non-empty-string $name
     */
    public static function getenv(string $name): ?string
    {
        $value = $_SERVER[$name] ?? $_ENV[$name] ?? getenv($name);

        if (is_string($value)) {
            return $value;
        }

        return null;
    }

    public static function authEmulatorHost(): string
    {
        $emulatorHost = self::getenv('FIREBASE_AUTH_EMULATOR_HOST');

        if (!in_array($emulatorHost, [null, ''], true)) {
            return $emulatorHost;
        }

        return '';
    }
}