<?php

class UserAgent
{
    const BROWSER_ENGINE_UNKNOW = 0;
    const BROWSER_ENGINE_PRESTO = 1;
    const BROWSER_ENGINE_TRIDENT = 2;
    const BROWSER_ENGINE_GECKO = 3;
    const BROWSER_ENGINE_WEBKIT = 4;
    const BROWSER_ENGINE_DILLO = 5;
    const BROWSER_ENGINE_KHTML = 6;
    const BROWSER_ENGINE_AMAYA = 7;
    const BROWSER_ENGINE_TKHTML = 8;
    const BROWSER_ENGINE_TEXT = 9;
    const BROWSER_ENGINE_BOT = 10;

    const PLATFORM_UNKNOW = 0;
    const PLATFORM_LINUX = 1;
    const PLATFORM_MAC = 2;
    const PLATFORM_WINDOWS = 3;
    const PLATFORM_CONSOLE = 4;
    const PLATFORM_MOBILE = 5;

    // Browser database
    // key = static ID, don't change it !
    // [0] => browser name
    // [1] => browser regexp
    // [2] => layout engine
    private static $browsers = array(
        // Bots
        1000   =>  array('bot', '(?xi:crawler|robot|spider|bot|Slurp|Google Desktop|curl|wget|
            YahooSeeker|Python-urllib|htdig|Ask Jeeves|ia_archiver|sohu-search|bnf\.f|
            Yahoo-Blogs|B-l-i-t-z-B-O-T|httrack|boitho.com-dc|Dataparksearch|StackRambler|
            FyberSpider|ichiro|Larbin|ZyBorg|Arachmo|Cerberian Drtrs|Furl|Scrubby|libwww-perl|
            Mnogosearch|NG-search|Pompos|silk|Teomat)', self::BROWSER_ENGINE_BOT),

        // Opera browsers
        // Version < 10 http://www.opera.com/support/kb/view/570/
        // Version >= 10 http://dev.opera.com/articles/view/opera-ua-string-changes/
        1   =>  array('Opera Mini', 'Opera Mini/([0-9.]+)', self::BROWSER_ENGINE_PRESTO),
        9   =>  array('Opera', '(?:Opera/9\.[89][0-9].*Presto/([0-9.]+) Version/([0-9.]+)|Opera[/ ](?P<b>[0-9.]+)(?:.*Presto/(?P<e>[0-9.]+))?)', self::BROWSER_ENGINE_PRESTO),

        // MSIE browsers
        10  =>  array('MyIE2', 'MSIE ([0-9.]+).*MyIE2', self::BROWSER_ENGINE_TRIDENT),
        11  =>  array('AOL', 'MSIE ([0-9]+).*(?:AOL|America Online Browser)', self::BROWSER_ENGINE_TRIDENT),
        12  =>  array('Avant Browser', 'MSIE ([0-9.]+).*Avant Browser', self::BROWSER_ENGINE_TRIDENT),
        13  =>  array('Crazy Browser', 'MSIE ([0-9.]+).*Crazy Browser', self::BROWSER_ENGINE_TRIDENT),
        13  =>  array('Maxthon', 'MSIE ([0-9.]+).*Maxthon', self::BROWSER_ENGINE_TRIDENT),

        19  =>  array('Internet Explorer', 'MSIE ([0-9.]+)', self::BROWSER_ENGINE_TRIDENT),

        // Gecko browsers (a lot!)
        20  =>  array('Iceape', 'Gecko/([0-9]+).*Iceape/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        21  =>  array('Camino', 'Gecko/([0-9]+).*Camino/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        22  =>  array('Epiphany', 'Gecko/([0-9]+).*Epiphany/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        23  =>  array('Firefox', 'Gecko(?:/([0-9]+))?.*(?:Firefox|BonEcho|GranParadiso|Firebird|Minefield)/([0-9abpre.]+)', self::BROWSER_ENGINE_GECKO),
        24  =>  array('Galeon', 'Gecko/([0-9]+).*Galeon/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        25  =>  array('Iceweasel', 'Gecko/([0-9]+).*Iceweasel/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        26  =>  array('K-Meleon', 'Gecko/([0-9]+).*(?:K-Meleon|K-Ninja)/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        27  =>  array('Kazehakase', 'Gecko/([0-9]+).*Kazehakase/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        28  =>  array('Netscape', 'Gecko/([0-9]+).*Netscape[0-9]*/([0-9.]+)', self::BROWSER_ENGINE_GECKO),
        29  =>  array('SeaMonkey', 'Gecko/([0-9]+).*SeMonkey/([0-9.]+)', self::BROWSER_ENGINE_GECKO),

        // We *don't* parse UA for Netscape < 6 versions, because it's too weird, and nobody care about it now
        30  =>  array('Mozilla', 'Mozilla/5\.0.*rv:(?P<b>[0-9.]+).*Gecko/(?P<e>[0-9]+)', self::BROWSER_ENGINE_GECKO),

        // WebKit browsers
        40  =>  array('NetNewsWire', 'AppleWebKit/([0-9.]+).*NetNewsWire/([0-9.]+)', self::BROWSER_ENGINE_WEBKIT),
        41  =>  array('OmniWeb', 'AppleWebKit/([0-9.]+).*OmniWeb/v([0-9.]+)', self::BROWSER_ENGINE_WEBKIT),
        42  =>  array('Shiira', 'AppleWebKit/([0-9.]+).*Shiira/([0-9.]+)', self::BROWSER_ENGINE_WEBKIT),
        43  =>  array('Chrome', 'AppleWebKit/([0-9.]+).*Chrome/([0-9.]+)', self::BROWSER_ENGINE_WEBKIT),

        59  =>  array('Safari', 'AppleWebKit/([0-9.]+).*Safari/([0-9.]+)', self::BROWSER_ENGINE_WEBKIT),

        // Other browsers
        101 =>  array('Dillo', 'Dillo/([0-9.]+)', self::BROWSER_ENGINE_DILLO),
        102 =>  array('Konqueror', 'Konqueror/([0-9.]+)', self::BROWSER_ENGINE_KHTML),
        103 =>  array('Hv3', 'Mozilla/5\.1 (X11; U; Linux i686; en-US; rv:1\.8\.0\.3) Gecko/20060425 SUSE/1\.5\.0\.3-7 Firefox/1\.5\.0\.3', self::BROWSER_ENGINE_TKHTML),
        104 =>  array('Amaya', 'amaya/([0-9.]+)', self::BROWSER_ENGINE_AMAYA),
        105 =>  array('Lynx', 'Lynx/([0-9.]+)', self::BROWSER_ENGINE_TEXT),
        106 =>  array('Links', 'Links \(([0-9.pre]+)', self::BROWSER_ENGINE_TEXT),
        107 =>  array('ELinks', '(?i:ELinks)[ /(]+([0-9.]+)', self::BROWSER_ENGINE_TEXT),
        108 =>  array('w3m', 'w3m/([0-9.]+)', self::BROWSER_ENGINE_TEXT),

        0   =>  array('Unknow', '(?i:Gecko|WebKit|Opera|MSIE|KHTML|Browser)', self::BROWSER_ENGINE_UNKNOW),
    );

    private static $systems = array(
        // Window systems
        1   =>  array('Windows XP', '(?:Windows XP|Windows NT 5\.1)', self::PLATFORM_WINDOWS),
        2   =>  array('Windows Vista', '(?:Windows Vista|Windows NT 6\.0)', self::PLATFORM_WINDOWS),
        3   =>  array('Windows Server 2003', 'Windows NT 5\.2', self::PLATFORM_WINDOWS),
        5   =>  array('Windows 2000', 'Windows NT 5\.0', self::PLATFORM_WINDOWS),
        6   =>  array('Windows Me', 'Windows Me', self::PLATFORM_WINDOWS),
        7   =>  array('Windows 95', 'Windows 95', self::PLATFORM_WINDOWS),
        8   =>  array('Windows 98', 'Windows 98', self::PLATFORM_WINDOWS),

        // Mac
        20  =>  array('Mac OS X', 'Mac OS X', self::PLATFORM_MAC),
        21  =>  array('MacOS 9', '(?:Macintosh|Mac)', self::PLATFORM_MAC),

        // BSD
        30  =>  array('OpenBSD', 'OpenBSD', self::PLATFORM_LINUX),
        31  =>  array('FreeBSD', 'FreeBSD', self::PLATFORM_LINUX),

        // Consoles
        40  =>  array('Console', '(?i:Wii|PSP|Playstation)', self::PLATFORM_CONSOLE),
        41  =>  array('Mobile', '(?i:Maemo|Smartphone|Windows CE|iPhone|BlackBerry|Symbian|MIDP)', self::PLATFORM_MOBILE),

        // Linux
        50  =>  array('Linux', 'Linux', self::PLATFORM_LINUX),

    );

    private static $plugins = array(
        1   =>  'Flash',
        2   =>  'Java',
        3   =>  'QuickTime',
        4   =>  'RealPlayer',
        5   =>  'PDF',
        6   =>  'MPlayer',
    );

    private static $rplugins = false;

    public static function extractInfos($ua)
    {
        $infos = array('id' => 0, 'os' => false, 'version' => 0, 'engine' => 0);

        foreach (self::$browsers as $id=>$properties)
        {
            if (preg_match('!'.$properties[1].'!i', $ua, $match))
            {
                $infos['id'] = $id;

                if ($id == 1000)
                    return $infos;
                
                if (isset($match['b']))
                {
                    $infos['version'] = $match['b'];
                }
                elseif (isset($match[2]))
                {
                    $infos['version'] = $match[2];
                }

                if (isset($match['e']))
                {
                    $infos['engine'] = $match['e'];
                }
                else
                {
                    $infos['engine'] = $match[1];
                }
                
                break;
            }
        }

        foreach (self::$systems as $id=>$properties)
        {
            if (preg_match('!'.$properties[1].'!i', $ua, $match))
            {
                $infos['os'] = $id;
                break;
            }
        }

        if ($infos['id'] == 0)
            $infos['ua'] = $ua;

        return $infos;
    }

    public static function getBrowserName($id)
    {
        if (isset(self::$browsers[$id][0]))
            return self::$browsers[$id][0];
        else
            return 'Unknown';
    }

    public static function getBrowserEngine($id)
    {
        if (isset(self::$browsers[$id][2]))
            return self::$browsers[$id][2];
        elseif ($id >= 1000)
            return self::BROWSER_ENGINE_BOT;
        else
            return self::BROWSER_ENGINE_UNKNOW;
    }

    public static function getOSName($id)
    {
        if (isset(self::$systems[$id][0]))
            return self::$systems[$id][0];
        else
            return 'Unknown';
    }

    public static function getOSPlatform($id)
    {
        if (isset(self::$systems[$id][2]))
            return self::$systems[$id][2];
        else
            return self::PLATFORM_UNKNOW;
    }

    public static function extractLangs($langs_str)
    {
        $langs_str = explode(',', $langs_str);
        $langs = array();

        foreach ($langs as $item)
        {
            if (preg_match('/;q=([0-9.,]+)/', $item, $match))
            {
                $q = intval($match[1] * 10);
                $lang = str_replace($match[0], '', $item);
            }
            else
            {
                $q = 10;
                $lang = $item;
            }

            $lang = trim($lang);
            $lang = $lang[0] . $lang[1];

            if (!in_array($lang, $langs))
                $langs[$q] = $lang;
        }

        krsort($langs);

        return $langs;
    }

    public static function getPluginId($plugin)
    {
        if (!self::$rplugins)
            self::$rplugins = array_flip(self::$plugins);

        if (isset(self::$rplugins[$plugin]))
            return self::$rplugins[$plugin];
        else
            return false;
    }
}

?>