<?php
// {{{ICINGA_LICENSE_HEADER}}}
/**
 * This file is part of Icinga Web 2.
 *
 * Icinga Web 2 - Head for multiple monitoring backends.
 * Copyright (C) 2013 Icinga Development Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @copyright  2013 Icinga Development Team <info@icinga.org>
 * @license    http://www.gnu.org/licenses/gpl-2.0.txt GPL, version 2
 * @author     Icinga Development Team <info@icinga.org>
 *
 */
// {{{ICINGA_LICENSE_HEADER}}}

namespace Icinga\Application;

class Platform
{
    protected static $domain;
    protected static $hostname;
    protected static $fqdn;

    public static function isWindows()
    {
        return strtoupper(substr(PHP_OS, 0, 3)) === 'WIN';
    }

    public static function isLinux()
    {
        return strtoupper(substr(PHP_OS, 0, 5)) === 'LINUX';
    }

    public static function isCli()
    {
        if (PHP_SAPI == 'cli') {
            return true;
        } elseif ((PHP_SAPI == 'cgi' || PHP_SAPI == 'cgi-fcgi')
            && empty($_SERVER['SERVER_NAME'])) {
            return true;
        }
        return false;
    }

    public static function getHostname()
    {
        if (self::$hostname === null) {
            self::discoverHostname();
        }
        return self::$hostname;
    }

    public static function getDomain()
    {
        if (self::$domain === null) {
            self::discoverHostname();
        }
        return self::$domain;
    }

    public static function getFqdn()
    {
        if (self::$fqdn === null) {
            self::discoverHostname();
        }
        return self::$fqdn;
    }

    protected static function discoverHostname()
    {
        self::$hostname = gethostname();
        self::$fqdn = gethostbyaddr(gethostbyname(self::$hostname));

        if (substr(self::$fqdn, 0, strlen(self::$hostname)) === self::$hostname) {
            self::$domain = substr(self::$fqdn, strlen(self::$hostname) + 1);
        } else {
            self::$domain = array_shift(preg_split('~\.~', self::$hostname, 2));
        }
    }
}