<?php

/**
 * Device Detector - The Universal Device Detection library for parsing User Agents
 *
 * @link https://matomo.org
 *
 * @license http://www.gnu.org/licenses/lgpl.html LGPL v3 or later
 */

declare(strict_types=1);

namespace WP_Statistics\Dependencies\DeviceDetector\Parser;

use WP_Statistics\Dependencies\DeviceDetector\ClientHints;

/**
 * Class OperatingSystem
 *
 * Parses the useragent for operating system information
 *
 * Detected operating systems can be found in self::$operatingSystems and /regexes/oss.yml
 * This class also defined some operating system families and methods to get the family for a specific os
 */
class OperatingSystem extends AbstractParser
{
    /**
     * @var string
     */
    protected $fixtureFile = 'regexes/oss.yml';

    /**
     * @var string
     */
    protected $parserName = 'os';

    /**
     * Known operating systems mapped to their internal short codes
     *
     * @var array
     */
    protected static $operatingSystems = [
        'AIX' => 'AIX',
        'AND' => 'Android',
        'ADR' => 'Android TV',
        'ALP' => 'Alpine Linux',
        'AMZ' => 'Amazon Linux',
        'AMG' => 'AmigaOS',
        'ARM' => 'Armadillo OS',
        'ARO' => 'AROS',
        'ATV' => 'tvOS',
        'ARL' => 'Arch Linux',
        'AOS' => 'AOSC OS',
        'ASP' => 'ASPLinux',
        'AZU' => 'Azure Linux',
        'BTR' => 'BackTrack',
        'SBA' => 'Bada',
        'BYI' => 'Baidu Yi',
        'BEO' => 'BeOS',
        'BLB' => 'BlackBerry OS',
        'QNX' => 'BlackBerry Tablet OS',
        'PAN' => 'blackPanther OS',
        'BOS' => 'Bliss OS',
        'BMP' => 'Brew',
        'BSN' => 'BrightSignOS',
        'CAI' => 'Caixa Mágica',
        'CES' => 'CentOS',
        'CST' => 'CentOS Stream',
        'CLO' => 'Clear Linux OS',
        'CLR' => 'ClearOS Mobile',
        'COS' => 'Chrome OS',
        'CRS' => 'Chromium OS',
        'CHN' => 'China OS',
        'COL' => 'Coolita OS',
        'CYN' => 'CyanogenMod',
        'DEB' => 'Debian',
        'DEE' => 'Deepin',
        'DFB' => 'DragonFly',
        'DVK' => 'DVKBuntu',
        'ELE' => 'ElectroBSD',
        'EUL' => 'EulerOS',
        'FED' => 'Fedora',
        'FEN' => 'Fenix',
        'FOS' => 'Firefox OS',
        'FIR' => 'Fire OS',
        'FOR' => 'Foresight Linux',
        'FRE' => 'Freebox',
        'BSD' => 'FreeBSD',
        'FRI' => 'FRITZ!OS',
        'FYD' => 'FydeOS',
        'FUC' => 'Fuchsia',
        'GNT' => 'Gentoo',
        'GNX' => 'GENIX',
        'GEO' => 'GEOS',
        'GNS' => 'gNewSense',
        'GRI' => 'GridOS',
        'GTV' => 'Google TV',
        'HPX' => 'HP-UX',
        'HAI' => 'Haiku OS',
        'IPA' => 'iPadOS',
        'HAR' => 'HarmonyOS',
        'HAS' => 'HasCodingOS',
        'HEL' => 'HELIX OS',
        'IRI' => 'IRIX',
        'INF' => 'Inferno',
        'JME' => 'Java ME',
        'JOL' => 'Joli OS',
        'KOS' => 'KaiOS',
        'KAL' => 'Kali',
        'KAN' => 'Kanotix',
        'KIN' => 'KIN OS',
        'KOL' => 'KolibriOS',
        'KNO' => 'Knoppix',
        'KTV' => 'KreaTV',
        'KBT' => 'Kubuntu',
        'LIN' => 'GNU/Linux',
        'LEA' => 'LeafOS',
        'LND' => 'LindowsOS',
        'LNS' => 'Linspire',
        'LEN' => 'Lineage OS',
        'LIR' => 'Liri OS',
        'LOO' => 'Loongnix',
        'LBT' => 'Lubuntu',
        'LOS' => 'Lumin OS',
        'LUN' => 'LuneOS',
        'VLN' => 'VectorLinux',
        'MAC' => 'Mac',
        'MAE' => 'Maemo',
        'MAG' => 'Mageia',
        'MDR' => 'Mandriva',
        'SMG' => 'MeeGo',
        'MET' => 'Meta Horizon',
        'MCD' => 'MocorDroid',
        'MON' => 'moonOS',
        'EZX' => 'Motorola EZX',
        'MIN' => 'Mint',
        'MLD' => 'MildWild',
        'MOR' => 'MorphOS',
        'NBS' => 'NetBSD',
        'MTK' => 'MTK / Nucleus',
        'MRE' => 'MRE',
        'NXT' => 'NeXTSTEP',
        'NWS' => 'NEWS-OS',
        'WII' => 'Nintendo',
        'NDS' => 'Nintendo Mobile',
        'NOV' => 'Nova',
        'OS2' => 'OS/2',
        'T64' => 'OSF1',
        'OBS' => 'OpenBSD',
        'OVS' => 'OpenVMS',
        'OVZ' => 'OpenVZ',
        'OWR' => 'OpenWrt',
        'OTV' => 'Opera TV',
        'ORA' => 'Oracle Linux',
        'ORD' => 'Ordissimo',
        'PAR' => 'Pardus',
        'PCL' => 'PCLinuxOS',
        'PIC' => 'PICO OS',
        'PLA' => 'Plasma Mobile',
        'PSP' => 'PlayStation Portable',
        'PS3' => 'PlayStation',
        'PVE' => 'Proxmox VE',
        'PUF' => 'Puffin OS',
        'PUR' => 'PureOS',
        'QTP' => 'Qtopia',
        'PIO' => 'Raspberry Pi OS',
        'RAS' => 'Raspbian',
        'RHT' => 'Red Hat',
        'RST' => 'Red Star',
        'RED' => 'RedOS',
        'REV' => 'Revenge OS',
        'RIS' => 'risingOS',
        'ROS' => 'RISC OS',
        'ROC' => 'Rocky Linux',
        'ROK' => 'Roku OS',
        'RSO' => 'Rosa',
        'ROU' => 'RouterOS',
        'REM' => 'Remix OS',
        'RRS' => 'Resurrection Remix OS',
        'REX' => 'REX',
        'RZD' => 'RazoDroiD',
        'RXT' => 'RTOS & Next',
        'SAB' => 'Sabayon',
        'SSE' => 'SUSE',
        'SAF' => 'Sailfish OS',
        'SCI' => 'Scientific Linux',
        'SEE' => 'SeewoOS',
        'SER' => 'SerenityOS',
        'SIR' => 'Sirin OS',
        'SLW' => 'Slackware',
        'SOS' => 'Solaris',
        'SBL' => 'Star-Blade OS',
        'SYL' => 'Syllable',
        'SYM' => 'Symbian',
        'SYS' => 'Symbian OS',
        'S40' => 'Symbian OS Series 40',
        'S60' => 'Symbian OS Series 60',
        'SY3' => 'Symbian^3',
        'TEN' => 'TencentOS',
        'TDX' => 'ThreadX',
        'TIZ' => 'Tizen',
        'TIV' => 'TiVo OS',
        'TOS' => 'TmaxOS',
        'TUR' => 'Turbolinux',
        'UBT' => 'Ubuntu',
        'ULT' => 'ULTRIX',
        'UOS' => 'UOS',
        'VID' => 'VIDAA',
        'VIZ' => 'ViziOS',
        'WAS' => 'watchOS',
        'WER' => 'Wear OS',
        'WTV' => 'WebTV',
        'WHS' => 'Whale OS',
        'WIN' => 'Windows',
        'WCE' => 'Windows CE',
        'WIO' => 'Windows IoT',
        'WMO' => 'Windows Mobile',
        'WPH' => 'Windows Phone',
        'WRT' => 'Windows RT',
        'WPO' => 'WoPhone',
        'XBX' => 'Xbox',
        'XBT' => 'Xubuntu',
        'YNS' => 'YunOS',
        'ZEN' => 'Zenwalk',
        'ZOR' => 'ZorinOS',
        'IOS' => 'iOS',
        'POS' => 'palmOS',
        'WEB' => 'Webian',
        'WOS' => 'webOS',
    ];

    /**
     * Operating system families mapped to the short codes of the associated operating systems
     *
     * @var array
     */
    protected static $osFamilies = [
        'Android'               => [
            'AND', 'CYN', 'FIR', 'REM', 'RZD', 'MLD', 'MCD', 'YNS', 'GRI', 'HAR',
            'ADR', 'CLR', 'BOS', 'REV', 'LEN', 'SIR', 'RRS', 'WER', 'PIC', 'ARM',
            'HEL', 'BYI', 'RIS', 'PUF', 'LEA', 'MET',
        ],
        'AmigaOS'               => ['AMG', 'MOR', 'ARO'],
        'BlackBerry'            => ['BLB', 'QNX'],
        'Brew'                  => ['BMP'],
        'BeOS'                  => ['BEO', 'HAI'],
        'Chrome OS'             => ['COS', 'CRS', 'FYD', 'SEE'],
        'Firefox OS'            => ['FOS', 'KOS'],
        'Gaming Console'        => ['WII', 'PS3'],
        'Google TV'             => ['GTV'],
        'IBM'                   => ['OS2'],
        'iOS'                   => ['IOS', 'ATV', 'WAS', 'IPA'],
        'RISC OS'               => ['ROS'],
        'GNU/Linux'             => [
            'LIN', 'ARL', 'DEB', 'KNO', 'MIN', 'UBT', 'KBT', 'XBT', 'LBT', 'FED',
            'RHT', 'VLN', 'MDR', 'GNT', 'SAB', 'SLW', 'SSE', 'CES', 'BTR', 'SAF',
            'ORD', 'TOS', 'RSO', 'DEE', 'FRE', 'MAG', 'FEN', 'CAI', 'PCL', 'HAS',
            'LOS', 'DVK', 'ROK', 'OWR', 'OTV', 'KTV', 'PUR', 'PLA', 'FUC', 'PAR',
            'FOR', 'MON', 'KAN', 'ZEN', 'LND', 'LNS', 'CHN', 'AMZ', 'TEN', 'CST',
            'NOV', 'ROU', 'ZOR', 'RED', 'KAL', 'ORA', 'VID', 'TIV', 'BSN', 'RAS',
            'UOS', 'PIO', 'FRI', 'LIR', 'WEB', 'SER', 'ASP', 'AOS', 'LOO', 'EUL',
            'SCI', 'ALP', 'CLO', 'ROC', 'OVZ', 'PVE', 'RST', 'EZX', 'GNS', 'JOL',
            'TUR', 'QTP', 'WPO', 'PAN', 'VIZ', 'AZU', 'COL',
        ],
        'Mac'                   => ['MAC'],
        'Mobile Gaming Console' => ['PSP', 'NDS', 'XBX'],
        'OpenVMS'               => ['OVS'],
        'Real-time OS'          => ['MTK', 'TDX', 'MRE', 'JME', 'REX', 'RXT', 'KOL'],
        'Other Mobile'          => ['WOS', 'POS', 'SBA', 'TIZ', 'SMG', 'MAE', 'LUN', 'GEO'],
        'Symbian'               => ['SYM', 'SYS', 'SY3', 'S60', 'S40'],
        'Unix'                  => [
            'SOS', 'AIX', 'HPX', 'BSD', 'NBS', 'OBS', 'DFB', 'SYL', 'IRI', 'T64',
            'INF', 'ELE', 'GNX', 'ULT', 'NWS', 'NXT', 'SBL',
        ],
        'WebTV'                 => ['WTV'],
        'Windows'               => ['WIN'],
        'Windows Mobile'        => ['WPH', 'WMO', 'WCE', 'WRT', 'WIO', 'KIN'],
        'Other Smart TV'        => ['WHS'],
    ];

    /**
     * Contains a list of mappings from OS names we use to known client hint values
     *
     * @var array<string, array<string>>
     */
    protected static $clientHintMapping = [
        'GNU/Linux' => ['Linux'],
        'Mac'       => ['MacOS'],
    ];

    /**
     * Operating system families that are known as desktop only
     *
     * @var array
     */
    protected static $desktopOsArray = [
        'AmigaOS', 'IBM', 'GNU/Linux', 'Mac', 'Unix', 'Windows', 'BeOS', 'Chrome OS',
    ];

    /**
     * Fire OS version mapping
     *
     * @var array
     */
    private $fireOsVersionMapping = [
        '11'    => '8',
        '10'    => '8',
        '9'     => '7',
        '7'     => '6',
        '5'     => '5',
        '4.4.3' => '4.5.1',
        '4.4.2' => '4',
        '4.2.2' => '3',
        '4.0.3' => '3',
        '4.0.2' => '3',
        '4'     => '2',
        '2'     => '1',
    ];

    /**
     * Lineage OS version mapping
     *
     * @var array
     */
    private $lineageOsVersionMapping = [
        '16'    => '23',
        '15'    => '22',
        '14'    => '21',
        '13'    => '20.0',
        '12.1'  => '19.1',
        '12'    => '19.0',
        '11'    => '18.0',
        '10'    => '17.0',
        '9'     => '16.0',
        '8.1.0' => '15.1',
        '8.0.0' => '15.0',
        '7.1.2' => '14.1',
        '7.1.1' => '14.1',
        '7.0'   => '14.0',
        '6.0.1' => '13.0',
        '6.0'   => '13.0',
        '5.1.1' => '12.1',
        '5.0.2' => '12.0',
        '5.0'   => '12.0',
        '4.4.4' => '11.0',
        '4.3'   => '10.2',
        '4.2.2' => '10.1',
        '4.0.4' => '9.1.0',
    ];

    /**
     * Returns all available operating systems
     *
     * @return array
     */
    public static function getAvailableOperatingSystems(): array
    {
        return self::$operatingSystems;
    }

    /**
     * Returns all available operating system families
     *
     * @return array
     */
    public static function getAvailableOperatingSystemFamilies(): array
    {
        return self::$osFamilies;
    }

    /**
     * Returns the os name and shot name
     *
     * @param string $name
     *
     * @return array
     */
    public static function getShortOsData(string $name): array
    {
        $short = 'UNK';

        foreach (self::$operatingSystems as $osShort => $osName) {
            if (\strtolower($name) !== \strtolower($osName)) {
                continue;
            }

            $name  = $osName;
            $short = $osShort;

            break;
        }

        return \compact('short', 'name');
    }

    /**
     * @inheritdoc
     */
    public function parse(): ?array
    {
        $this->restoreUserAgentFromClientHints();

        $osFromClientHints = $this->parseOsFromClientHints();
        $osFromUserAgent   = $this->parseOsFromUserAgent();

        if (!empty($osFromClientHints['name'])) {
            $name    = $osFromClientHints['name'];
            $version = $osFromClientHints['version'];

            // use version from user agent if non was provided in client hints, but os family from useragent matches
            if (empty($version)
                && self::getOsFamily($name) === self::getOsFamily($osFromUserAgent['name'])
            ) {
                $version = $osFromUserAgent['version'];
            }

            // On Windows, version 0.0.0 can be either 7, 8 or 8.1
            if ('Windows' === $name && '0.0.0' === $version) {
                $version = ('10' === $osFromUserAgent['version']) ? '' : $osFromUserAgent['version'];
            }

            // If the OS name detected from client hints matches the OS family from user agent
            // but the os name is another, we use the one from user agent, as it might be more detailed
            if (self::getOsFamily($osFromUserAgent['name']) === $name && $osFromUserAgent['name'] !== $name) {
                $name = $osFromUserAgent['name'];

                if ('LeafOS' === $name || 'HarmonyOS' === $name) {
                    $version = '';
                }

                if ('PICO OS' === $name) {
                    $version = $osFromUserAgent['version'];
                }

                if ('Fire OS' === $name && !empty($osFromClientHints['version'])) {
                    $majorVersion = (int) (\explode('.', $version, 1)[0] ?? '0');

                    $version = $this->fireOsVersionMapping[$version]
                        ?? $this->fireOsVersionMapping[$majorVersion] ?? '';
                }
            }

            $short = $osFromClientHints['short_name'];

            // Chrome OS is in some cases reported as Linux in client hints, we fix this only if the version matches
            if ('GNU/Linux' === $name
                && 'Chrome OS' === $osFromUserAgent['name']
                && $osFromClientHints['version'] === $osFromUserAgent['version']
            ) {
                $name  = $osFromUserAgent['name'];
                $short = $osFromUserAgent['short_name'];
            }

            // Chrome OS is in some cases reported as Android in client hints
            if ('Android' === $name && 'Chrome OS' === $osFromUserAgent['name']) {
                $name    = $osFromUserAgent['name'];
                $version = '';
                $short   = $osFromUserAgent['short_name'];
            }

            // Meta Horizon is reported as Linux in client hints
            if ('GNU/Linux' === $name && 'Meta Horizon' === $osFromUserAgent['name']) {
                $name  = $osFromUserAgent['name'];
                $short = $osFromUserAgent['short_name'];
            }
        } elseif (!empty($osFromUserAgent['name'])) {
            $name    = $osFromUserAgent['name'];
            $version = $osFromUserAgent['version'];
            $short   = $osFromUserAgent['short_name'];
        } else {
            return [];
        }

        $platform    = $this->parsePlatform();
        $family      = self::getOsFamily($short);
        $androidApps = [
            'com.hisense.odinbrowser', 'com.seraphic.openinet.pre', 'com.appssppa.idesktoppcbrowser',
            'every.browser.inc',
        ];

        if (null !== $this->clientHints) {
            if (\in_array($this->clientHints->getApp(), $androidApps) && 'Android' !== $name) {
                $name    = 'Android';
                $family  = 'Android';
                $short   = 'ADR';
                $version = '';
            }

            if ('org.lineageos.jelly' === $this->clientHints->getApp() && 'Lineage OS' !== $name) {
                $majorVersion = (int) (\explode('.', $version, 1)[0] ?? '0');

                $name    = 'Lineage OS';
                $family  = 'Android';
                $short   = 'LEN';
                $version = $this->lineageOsVersionMapping[$version]
                    ?? $this->lineageOsVersionMapping[$majorVersion] ?? '';
            }

            if ('org.mozilla.tv.firefox' === $this->clientHints->getApp() && 'Fire OS' !== $name) {
                $majorVersion = (int) (\explode('.', $version, 1)[0] ?? '0');

                $name    = 'Fire OS';
                $family  = 'Android';
                $short   = 'FIR';
                $version = $this->fireOsVersionMapping[$version] ?? $this->fireOsVersionMapping[$majorVersion] ?? '';
            }
        }

        $return = [
            'name'       => $name,
            'short_name' => $short,
            'version'    => $version,
            'platform'   => $platform,
            'family'     => $family,
        ];

        if (\in_array($return['name'], self::$operatingSystems)) {
            $return['short_name'] = \array_search($return['name'], self::$operatingSystems);
        }

        return $return;
    }

    /**
     * Returns the operating system family for the given operating system
     *
     * @param string $osLabel name or short name
     *
     * @return string|null If null, "Unknown"
     */
    public static function getOsFamily(string $osLabel): ?string
    {
        if (\in_array($osLabel, self::$operatingSystems)) {
            $osLabel = \array_search($osLabel, self::$operatingSystems);
        }

        foreach (self::$osFamilies as $family => $labels) {
            if (\in_array($osLabel, $labels)) {
                return (string) $family;
            }
        }

        return null;
    }

    /**
     * Returns true if OS is desktop
     *
     * @param string $osName OS short name
     *
     * @return bool
     */
    public static function isDesktopOs(string $osName): bool
    {
        $osFamily = self::getOsFamily($osName);

        return \in_array($osFamily, self::$desktopOsArray);
    }

    /**
     * Returns the full name for the given short name
     *
     * @param string      $os
     * @param string|null $ver
     *
     * @return ?string
     */
    public static function getNameFromId(string $os, ?string $ver = null): ?string
    {
        if (\array_key_exists($os, self::$operatingSystems)) {
            $osFullName = self::$operatingSystems[$os];

            return \trim($osFullName . ' ' . $ver);
        }

        return null;
    }

    /**
     * Returns the OS that can be safely detected from client hints
     *
     * @return array
     */
    protected function parseOsFromClientHints(): array
    {
        $name = $version = $short = '';

        if ($this->clientHints instanceof ClientHints && $this->clientHints->getOperatingSystem()) {
            $hintName = $this->applyClientHintMapping($this->clientHints->getOperatingSystem());

            foreach (self::$operatingSystems as $osShort => $osName) {
                if ($this->fuzzyCompare($hintName, $osName)) {
                    $name  = $osName;
                    $short = $osShort;

                    break;
                }
            }

            $version = $this->clientHints->getOperatingSystemVersion();

            if ('Windows' === $name) {
                $majorVersion = (int) (\explode('.', $version, 1)[0] ?? '0');
                $minorVersion = (int) (\explode('.', $version, 2)[1] ?? '0');

                if (0 === $majorVersion) {
                    $minorVersionMapping = [1 => '7', 2 => '8', 3 => '8.1'];
                    $version             = $minorVersionMapping[$minorVersion] ?? $version;
                } elseif ($majorVersion > 0 && $majorVersion < 11) {
                    $version = '10';
                } elseif ($majorVersion > 10) {
                    $version = '11';
                }
            }

            // On Windows, version 0.0.0 can be either 7, 8 or 8.1, so we return 0.0.0
            if ('Windows' !== $name && '0.0.0' !== $version && 0 === (int) $version) {
                $version = '';
            }
        }

        return [
            'name'       => $name,
            'short_name' => $short,
            'version'    => $this->buildVersion($version, []),
        ];
    }

    /**
     * Returns the OS that can be detected from useragent
     *
     * @return array
     *
     * @throws \Exception
     */
    protected function parseOsFromUserAgent(): array
    {
        $osRegex = $matches = [];
        $name    = $version = $short = '';

        foreach ($this->getRegexes() as $osRegex) {
            $matches = $this->matchUserAgent($osRegex['regex']);

            if ($matches) {
                break;
            }
        }

        if (!empty($matches)) {
            $name                                = $this->buildByMatch($osRegex['name'], $matches);
            ['name' => $name, 'short' => $short] = self::getShortOsData($name);

            $version = \array_key_exists('version', $osRegex)
                ? $this->buildVersion((string) $osRegex['version'], $matches)
                : '';

            foreach ($osRegex['versions'] ?? [] as $regex) {
                $matches = $this->matchUserAgent($regex['regex']);

                if (!$matches) {
                    continue;
                }

                if (\array_key_exists('name', $regex)) {
                    $name                                = $this->buildByMatch($regex['name'], $matches);
                    ['name' => $name, 'short' => $short] = self::getShortOsData($name);
                }

                if (\array_key_exists('version', $regex)) {
                    $version = $this->buildVersion((string) $regex['version'], $matches);
                }

                break;
            }
        }

        return [
            'name'       => $name,
            'short_name' => $short,
            'version'    => $version,
        ];
    }

    /**
     * Parse current UserAgent string for the operating system platform
     *
     * @return string
     */
    protected function parsePlatform(): string
    {
        // Use architecture from client hints if available
        if ($this->clientHints instanceof ClientHints && $this->clientHints->getArchitecture()) {
            $arch = \strtolower($this->clientHints->getArchitecture());

            if (false !== \strpos($arch, 'arm')) {
                return 'ARM';
            }

            if (false !== \strpos($arch, 'loongarch64')) {
                return 'LoongArch64';
            }

            if (false !== \strpos($arch, 'mips')) {
                return 'MIPS';
            }

            if (false !== \strpos($arch, 'sh4')) {
                return 'SuperH';
            }

            if (false !== \strpos($arch, 'sparc64')) {
                return 'SPARC64';
            }

            if (false !== \strpos($arch, 'x64')
                || (false !== \strpos($arch, 'x86') && '64' === $this->clientHints->getBitness())
            ) {
                return 'x64';
            }

            if (false !== \strpos($arch, 'x86')) {
                return 'x86';
            }
        }

        if ($this->matchUserAgent('arm[ _;)ev]|.*arm$|.*arm64|aarch64|Apple ?TV|Watch ?OS|Watch1,[12]')) {
            return 'ARM';
        }

        if ($this->matchUserAgent('loongarch64')) {
            return 'LoongArch64';
        }

        if ($this->matchUserAgent('mips')) {
            return 'MIPS';
        }

        if ($this->matchUserAgent('sh4')) {
            return 'SuperH';
        }

        if ($this->matchUserAgent('sparc64')) {
            return 'SPARC64';
        }

        if ($this->matchUserAgent('64-?bit|WOW64|(?:Intel)?x64|WINDOWS_64|win64|.*amd64|.*x86_?64')) {
            return 'x64';
        }

        if ($this->matchUserAgent('.*32bit|.*win32|(?:i[0-9]|x)86|i86pc')) {
            return 'x86';
        }

        return '';
    }
}
