/**
* @author       Richard Davey <rich@photonstorm.com>
* @copyright    2016 Photon Storm Ltd.
* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/

/**
* @classdesc
* Detects device support capabilities and is responsible for device initialization - see {@link Phaser.Device.whenReady whenReady}.
*
* This class represents a singleton object that can be accessed directly as `game.device`
* (or, as a fallback, `Phaser.Device` when a game instance is not available) without the need to instantiate it.
*
* Unless otherwise noted the device capabilities are only guaranteed after initialization. Initialization
* occurs automatically and is guaranteed complete before {@link Phaser.Game} begins its "boot" phase.
* Feature detection can be modified in the {@link Phaser.Device.onInitialized onInitialized} signal.
*
* When checking features using the exposed properties only the *truth-iness* of the value should be relied upon
* unless the documentation states otherwise: properties may return `false`, `''`, `null`, or even `undefined`
* when indicating the lack of a feature.
*
* Uses elements from System.js by MrDoob and Modernizr
*
* @description
* It is not possible to instantiate the Device class manually.
*
* @class
* @protected
*/
Phaser.Device = function () {

    /**
    * The time the device became ready.
    * @property {integer} deviceReadyAt
    * @protected
    */
    this.deviceReadyAt = 0;

    /**
    * The time as which initialization has completed.
    * @property {boolean} initialized
    * @protected
    */
    this.initialized = false;

    //  Browser / Host / Operating System

    /**
    * @property {boolean} desktop - Is running on a desktop?
    * @default
    */
    this.desktop = false;

    /**
    * @property {boolean} iOS - Is running on iOS?
    * @default
    */
    this.iOS = false;

    /**
    * @property {number} iOSVersion - If running in iOS this will contain the major version number.
    * @default
    */
    this.iOSVersion = 0;

    /**
    * @property {boolean} cocoonJS - Is the game running under CocoonJS?
    * @default
    */
    this.cocoonJS = false;
    
    /**
    * @property {boolean} cocoonJSApp - Is this game running with CocoonJS.App?
    * @default
    */
    this.cocoonJSApp = false;
    
    /**
    * @property {boolean} cordova - Is the game running under Apache Cordova?
    * @default
    */
    this.cordova = false;
    
    /**
    * @property {boolean} node - Is the game running under Node.js?
    * @default
    */
    this.node = false;
    
    /**
    * @property {boolean} nodeWebkit - Is the game running under Node-Webkit?
    * @default
    */
    this.nodeWebkit = false;
    
    /**
    * @property {boolean} electron - Is the game running under GitHub Electron?
    * @default
    */
    this.electron = false;
    
    /**
    * @property {boolean} ejecta - Is the game running under Ejecta?
    * @default
    */
    this.ejecta = false;

    /**
    * @property {boolean} crosswalk - Is the game running under the Intel Crosswalk XDK?
    * @default
    */
    this.crosswalk = false;

    /**
    * @property {boolean} android - Is running on android?
    * @default
    */
    this.android = false;

    /**
    * @property {boolean} chromeOS - Is running on chromeOS?
    * @default
    */
    this.chromeOS = false;

    /**
    * @property {boolean} linux - Is running on linux?
    * @default
    */
    this.linux = false;

    /**
    * @property {boolean} macOS - Is running on macOS?
    * @default
    */
    this.macOS = false;

    /**
    * @property {boolean} windows - Is running on windows?
    * @default
    */
    this.windows = false;

    /**
    * @property {boolean} windowsPhone - Is running on a Windows Phone?
    * @default
    */
    this.windowsPhone = false;

    //  Features

    /**
    * @property {boolean} canvas - Is canvas available?
    * @default
    */
    this.canvas = false;

    /**
    * @property {?boolean} canvasBitBltShift - True if canvas supports a 'copy' bitblt onto itself when the source and destination regions overlap.
    * @default
    */
    this.canvasBitBltShift = null;

    /**
    * @property {boolean} webGL - Is webGL available?
    * @default
    */
    this.webGL = false;

    /**
    * @property {boolean} file - Is file available?
    * @default
    */
    this.file = false;

    /**
    * @property {boolean} fileSystem - Is fileSystem available?
    * @default
    */
    this.fileSystem = false;

    /**
    * @property {boolean} localStorage - Is localStorage available?
    * @default
    */
    this.localStorage = false;

    /**
    * @property {boolean} worker - Is worker available?
    * @default
    */
    this.worker = false;

    /**
    * @property {boolean} css3D - Is css3D available?
    * @default
    */
    this.css3D = false;

    /**
    * @property {boolean} pointerLock - Is Pointer Lock available?
    * @default
    */
    this.pointerLock = false;

    /**
    * @property {boolean} typedArray - Does the browser support TypedArrays?
    * @default
    */
    this.typedArray = false;

    /**
    * @property {boolean} vibration - Does the device support the Vibration API?
    * @default
    */
    this.vibration = false;

    /**
    * @property {boolean} getUserMedia - Does the device support the getUserMedia API?
    * @default
    */
    this.getUserMedia = true;

    /**
    * @property {boolean} quirksMode - Is the browser running in strict mode (false) or quirks mode? (true)
    * @default
    */
    this.quirksMode = false;

    //  Input

    /**
    * @property {boolean} touch - Is touch available?
    * @default
    */
    this.touch = false;

    /**
    * @property {boolean} mspointer - Is mspointer available?
    * @default
    */
    this.mspointer = false;

    /**
    * @property {?string} wheelType - The newest type of Wheel/Scroll event supported: 'wheel', 'mousewheel', 'DOMMouseScroll'
    * @default
    * @protected
    */
    this.wheelEvent = null;

    //  Browser

    /**
    * @property {boolean} arora - Set to true if running in Arora.
    * @default
    */
    this.arora = false;

    /**
    * @property {boolean} chrome - Set to true if running in Chrome.
    * @default
    */
    this.chrome = false;

    /**
    * @property {number} chromeVersion - If running in Chrome this will contain the major version number.
    * @default
    */
    this.chromeVersion = 0;

    /**
    * @property {boolean} epiphany - Set to true if running in Epiphany.
    * @default
    */
    this.epiphany = false;

    /**
    * @property {boolean} firefox - Set to true if running in Firefox.
    * @default
    */
    this.firefox = false;

    /**
    * @property {number} firefoxVersion - If running in Firefox this will contain the major version number.
    * @default
    */
    this.firefoxVersion = 0;

    /**
    * @property {boolean} ie - Set to true if running in Internet Explorer.
    * @default
    */
    this.ie = false;

    /**
    * @property {number} ieVersion - If running in Internet Explorer this will contain the major version number. Beyond IE10 you should use Device.trident and Device.tridentVersion.
    * @default
    */
    this.ieVersion = 0;

    /**
    * @property {boolean} trident - Set to true if running a Trident version of Internet Explorer (IE11+)
    * @default
    */
    this.trident = false;

    /**
    * @property {number} tridentVersion - If running in Internet Explorer 11 this will contain the major version number. See {@link http://msdn.microsoft.com/en-us/library/ie/ms537503(v=vs.85).aspx}
    * @default
    */
    this.tridentVersion = 0;

    /**
    * @property {boolean} edge - Set to true if running in Microsoft Edge browser.
    * @default
    */
    this.edge = false;

    /**
    * @property {boolean} mobileSafari - Set to true if running in Mobile Safari.
    * @default
    */
    this.mobileSafari = false;

    /**
    * @property {boolean} midori - Set to true if running in Midori.
    * @default
    */
    this.midori = false;

    /**
    * @property {boolean} opera - Set to true if running in Opera.
    * @default
    */
    this.opera = false;

    /**
    * @property {boolean} safari - Set to true if running in Safari.
    * @default
    */
    this.safari = false;

    /**
    * @property {number} safariVersion - If running in Safari this will contain the major version number.
    * @default
    */
    this.safariVersion = 0;

    /**
    * @property {boolean} webApp - Set to true if running as a WebApp, i.e. within a WebView
    * @default
    */
    this.webApp = false;

    /**
    * @property {boolean} silk - Set to true if running in the Silk browser (as used on the Amazon Kindle)
    * @default
    */
    this.silk = false;

    //  Audio

    /**
    * @property {boolean} audioData - Are Audio tags available?
    * @default
    */
    this.audioData = false;

    /**
    * @property {boolean} webAudio - Is the WebAudio API available?
    * @default
    */
    this.webAudio = false;

    /**
    * @property {boolean} ogg - Can this device play ogg files?
    * @default
    */
    this.ogg = false;

    /**
    * @property {boolean} opus - Can this device play opus files?
    * @default
    */
    this.opus = false;

    /**
    * @property {boolean} mp3 - Can this device play mp3 files?
    * @default
    */
    this.mp3 = false;

    /**
    * @property {boolean} wav - Can this device play wav files?
    * @default
    */
    this.wav = false;

    /**
    * Can this device play m4a files?
    * @property {boolean} m4a - True if this device can play m4a files.
    * @default
    */
    this.m4a = false;

    /**
    * @property {boolean} webm - Can this device play webm files?
    * @default
    */
    this.webm = false;

    /**
    * @property {boolean} dolby - Can this device play EC-3 Dolby Digital Plus files?
    * @default
    */
    this.dolby = false;

    //  Video

    /**
    * @property {boolean} oggVideo - Can this device play ogg video files?
    * @default
    */
    this.oggVideo = false;

    /**
    * @property {boolean} h264Video - Can this device play h264 mp4 video files?
    * @default
    */
    this.h264Video = false;

    /**
    * @property {boolean} mp4Video - Can this device play h264 mp4 video files?
    * @default
    */
    this.mp4Video = false;

    /**
    * @property {boolean} webmVideo - Can this device play webm video files?
    * @default
    */
    this.webmVideo = false;

    /**
    * @property {boolean} vp9Video - Can this device play vp9 video files?
    * @default
    */
    this.vp9Video = false;

    /**
    * @property {boolean} hlsVideo - Can this device play hls video files?
    * @default
    */
    this.hlsVideo = false;

    //  Device

    /**
    * @property {boolean} iPhone - Is running on iPhone?
    * @default
    */
    this.iPhone = false;

    /**
    * @property {boolean} iPhone4 - Is running on iPhone4?
    * @default
    */
    this.iPhone4 = false;

    /**
    * @property {boolean} iPad - Is running on iPad?
    * @default
    */
    this.iPad = false;

    // Device features

    /**
    * @property {number} pixelRatio - PixelRatio of the host device?
    * @default
    */
    this.pixelRatio = 0;

    /**
    * @property {boolean} littleEndian - Is the device big or little endian? (only detected if the browser supports TypedArrays)
    * @default
    */
    this.littleEndian = false;

    /**
    * @property {boolean} LITTLE_ENDIAN - Same value as `littleEndian`.
    * @default
    */
    this.LITTLE_ENDIAN = false;

    /**
    * @property {boolean} support32bit - Does the device context support 32bit pixel manipulation using array buffer views?
    * @default
    */
    this.support32bit = false;

    /**
    * @property {boolean} fullscreen - Does the browser support the Full Screen API?
    * @default
    */
    this.fullscreen = false;

    /**
    * @property {string} requestFullscreen - If the browser supports the Full Screen API this holds the call you need to use to activate it.
    * @default
    */
    this.requestFullscreen = '';

    /**
    * @property {string} cancelFullscreen - If the browser supports the Full Screen API this holds the call you need to use to cancel it.
    * @default
    */
    this.cancelFullscreen = '';

    /**
    * @property {boolean} fullscreenKeyboard - Does the browser support access to the Keyboard during Full Screen mode?
    * @default
    */
    this.fullscreenKeyboard = false;

};

// Device is really a singleton/static entity; instantiate it
// and add new methods directly sans-prototype.
Phaser.Device = new Phaser.Device();

/**
* This signal is dispatched after device initialization occurs but before any of the ready
* callbacks (see {@link Phaser.Device.whenReady whenReady}) have been invoked.
*
* Local "patching" for a particular device can/should be done in this event.
*
* _Note_: This signal is removed after the device has been readied; if a handler has not been
* added _before_ `new Phaser.Game(..)` it is probably too late.
*
* @type {?Phaser.Signal}
* @static
*/
Phaser.Device.onInitialized = new Phaser.Signal();

/**
* Add a device-ready handler and ensure the device ready sequence is started.
*
* Phaser.Device will _not_ activate or initialize until at least one `whenReady` handler is added,
* which is normally done automatically be calling `new Phaser.Game(..)`.
*
* The handler is invoked when the device is considered "ready", which may be immediately
* if the device is already "ready". See {@link Phaser.Device#deviceReadyAt deviceReadyAt}.
*
* @method
* @param {function} handler - Callback to invoke when the device is ready. It is invoked with the given context the Phaser.Device object is supplied as the first argument.
* @param {object} [context] - Context in which to invoke the handler
* @param {boolean} [nonPrimer=false] - If true the device ready check will not be started.
*/
Phaser.Device.whenReady = function (callback, context, nonPrimer) {

    var readyCheck = this._readyCheck;

    if (this.deviceReadyAt || !readyCheck)
    {
        callback.call(context, this);
    }
    else if (readyCheck._monitor || nonPrimer)
    {
        readyCheck._queue = readyCheck._queue || [];
        readyCheck._queue.push([callback, context]);
    }
    else
    {
        readyCheck._monitor = readyCheck.bind(this);
        readyCheck._queue = readyCheck._queue || [];
        readyCheck._queue.push([callback, context]);
        
        var cordova = typeof window.cordova !== 'undefined';
        var cocoonJS = navigator['isCocoonJS'];

        if (document.readyState === 'complete' || document.readyState === 'interactive')
        {
            // Why is there an additional timeout here?
            window.setTimeout(readyCheck._monitor, 0);
        }
        else if (cordova && !cocoonJS)
        {
            // Ref. http://docs.phonegap.com/en/3.5.0/cordova_events_events.md.html#deviceready
            //  Cordova, but NOT Cocoon?
            document.addEventListener('deviceready', readyCheck._monitor, false);
        }
        else
        {
            document.addEventListener('DOMContentLoaded', readyCheck._monitor, false);
            window.addEventListener('load', readyCheck._monitor, false);
        }
    }

};

/**
* Internal method used for checking when the device is ready.
* This function is removed from Phaser.Device when the device becomes ready.
*
* @method
* @private
*/
Phaser.Device._readyCheck = function () {

    var readyCheck = this._readyCheck;

    if (!document.body)
    {
        window.setTimeout(readyCheck._monitor, 20);
    }
    else if (!this.deviceReadyAt)
    {
        this.deviceReadyAt = Date.now();

        document.removeEventListener('deviceready', readyCheck._monitor);
        document.removeEventListener('DOMContentLoaded', readyCheck._monitor);
        window.removeEventListener('load', readyCheck._monitor);

        this._initialize();
        this.initialized = true;

        this.onInitialized.dispatch(this);

        var item;
        while ((item = readyCheck._queue.shift()))
        {
            var callback = item[0];
            var context = item[1];
            callback.call(context, this);
        }

        // Remove no longer useful methods and properties.
        this._readyCheck = null;
        this._initialize = null;
        this.onInitialized = null;
    }

};

/**
* Internal method to initialize the capability checks.
* This function is removed from Phaser.Device once the device is initialized.
*
* @method
* @private
*/
Phaser.Device._initialize = function () {

    var device = this;

    /**
    * Check which OS is game running on.
    */
    function _checkOS () {

        var ua = navigator.userAgent;

        if (/Playstation Vita/.test(ua))
        {
            device.vita = true;
        }
        else if (/Kindle/.test(ua) || /\bKF[A-Z][A-Z]+/.test(ua) || /Silk.*Mobile Safari/.test(ua))
        {
            device.kindle = true;
            // This will NOT detect early generations of Kindle Fire, I think there is no reliable way...
            // E.g. "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us; Silk/1.1.0-80) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16 Silk-Accelerated=true"
        }
        else if (/Android/.test(ua))
        {
            device.android = true;
        }
        else if (/CrOS/.test(ua))
        {
            device.chromeOS = true;
        }
        else if (/iP[ao]d|iPhone/i.test(ua))
        {
            device.iOS = true;
            (navigator.appVersion).match(/OS (\d+)/);
            device.iOSVersion = parseInt(RegExp.$1, 10);
        }
        else if (/Linux/.test(ua))
        {
            device.linux = true;
        }
        else if (/Mac OS/.test(ua))
        {
            device.macOS = true;
        }
        else if (/Windows/.test(ua))
        {
            device.windows = true;
        }

        if (/Windows Phone/i.test(ua) || /IEMobile/i.test(ua))
        {
            device.android = false;
            device.iOS = false;
            device.macOS = false;
            device.windows = true;
            device.windowsPhone = true;
        }

        var silk = /Silk/.test(ua); // detected in browsers

        if (device.windows || device.macOS || (device.linux && !silk) || device.chromeOS)
        {
            device.desktop = true;
        }

        //  Windows Phone / Table reset
        if (device.windowsPhone || ((/Windows NT/i.test(ua)) && (/Touch/i.test(ua))))
        {
            device.desktop = false;
        }

    }

    /**
    * Check HTML5 features of the host environment.
    */
    function _checkFeatures () {

        device.canvas = !!window['CanvasRenderingContext2D'] || device.cocoonJS;

        try {
            device.localStorage = !!localStorage.getItem;
        } catch (error) {
            device.localStorage = false;
        }

        device.file = !!window['File'] && !!window['FileReader'] && !!window['FileList'] && !!window['Blob'];
        device.fileSystem = !!window['requestFileSystem'];

        device.webGL = ( function () { try { var canvas = document.createElement( 'canvas' ); /*Force screencanvas to false*/ canvas.screencanvas = false; return !! window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ); } catch( e ) { return false; } } )();
        device.webGL = !!device.webGL;

        device.worker = !!window['Worker'];

        device.pointerLock = 'pointerLockElement' in document || 'mozPointerLockElement' in document || 'webkitPointerLockElement' in document;

        device.quirksMode = (document.compatMode === 'CSS1Compat') ? false : true;

        navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia || navigator.oGetUserMedia;

        window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;

        device.getUserMedia = device.getUserMedia && !!navigator.getUserMedia && !!window.URL;

        // Older versions of firefox (< 21) apparently claim support but user media does not actually work
        if (device.firefox && device.firefoxVersion < 21)
        {
            device.getUserMedia = false;
        }

        // TODO: replace canvasBitBltShift detection with actual feature check

        // Excludes iOS versions as they generally wrap UIWebView (eg. Safari WebKit) and it
        // is safer to not try and use the fast copy-over method.
        if (!device.iOS && (device.ie || device.firefox || device.chrome))
        {
            device.canvasBitBltShift = true;
        }

        // Known not to work
        if (device.safari || device.mobileSafari)
        {
            device.canvasBitBltShift = false;
        }

    }

    /**
    * Checks/configures various input.
    */
    function _checkInput () {

        if ('ontouchstart' in document.documentElement || (window.navigator.maxTouchPoints && window.navigator.maxTouchPoints >= 1))
        {
            device.touch = true;
        }

        if (window.navigator.msPointerEnabled || window.navigator.pointerEnabled)
        {
            device.mspointer = true;
        }

        if (!device.cocoonJS)
        {
            // See https://developer.mozilla.org/en-US/docs/Web/Events/wheel
            if ('onwheel' in window || (device.ie && 'WheelEvent' in window))
            {
                // DOM3 Wheel Event: FF 17+, IE 9+, Chrome 31+, Safari 7+
                device.wheelEvent = 'wheel';
            }
            else if ('onmousewheel' in window)
            {
                // Non-FF legacy: IE 6-9, Chrome 1-31, Safari 5-7.
                device.wheelEvent = 'mousewheel';
            }
            else if (device.firefox && 'MouseScrollEvent' in window)
            {
                // FF prior to 17. This should probably be scrubbed.
                device.wheelEvent = 'DOMMouseScroll';
            }
        }

    }

    /**
    * Checks for support of the Full Screen API.
    */
    function _checkFullScreenSupport () {

        var fs = [
            'requestFullscreen',
            'requestFullScreen',
            'webkitRequestFullscreen',
            'webkitRequestFullScreen',
            'msRequestFullscreen',
            'msRequestFullScreen',
            'mozRequestFullScreen',
            'mozRequestFullscreen'
        ];

        var element = document.createElement('div');

        for (var i = 0; i < fs.length; i++)
        {
            if (element[fs[i]])
            {
                device.fullscreen = true;
                device.requestFullscreen = fs[i];
                break;
            }
        }

        var cfs = [
            'cancelFullScreen',
            'exitFullscreen',
            'webkitCancelFullScreen',
            'webkitExitFullscreen',
            'msCancelFullScreen',
            'msExitFullscreen',
            'mozCancelFullScreen',
            'mozExitFullscreen'
        ];

        if (device.fullscreen)
        {
            for (var i = 0; i < cfs.length; i++)
            {
                if (document[cfs[i]])
                {
                    device.cancelFullscreen = cfs[i];
                    break;
                }
            }
        }

        //  Keyboard Input?
        if (window['Element'] && Element['ALLOW_KEYBOARD_INPUT'])
        {
            device.fullscreenKeyboard = true;
        }

    }

    /**
    * Check what browser is game running in.
    */
    function _checkBrowser () {

        var ua = navigator.userAgent;

        if (/Arora/.test(ua))
        {
            device.arora = true;
        }
        else if (/Edge\/\d+/.test(ua))
        {
            device.edge = true;
        }
        else if (/Chrome\/(\d+)/.test(ua) && !device.windowsPhone)
        {
            device.chrome = true;
            device.chromeVersion = parseInt(RegExp.$1, 10);
        }
        else if (/Epiphany/.test(ua))
        {
            device.epiphany = true;
        }
        else if (/Firefox\D+(\d+)/.test(ua))
        {
            device.firefox = true;
            device.firefoxVersion = parseInt(RegExp.$1, 10);
        }
        else if (/AppleWebKit/.test(ua) && device.iOS)
        {
            device.mobileSafari = true;
        }
        else if (/MSIE (\d+\.\d+);/.test(ua))
        {
            device.ie = true;
            device.ieVersion = parseInt(RegExp.$1, 10);
        }
        else if (/Midori/.test(ua))
        {
            device.midori = true;
        }
        else if (/Opera/.test(ua))
        {
            device.opera = true;
        }
        else if (/Safari\/(\d+)/.test(ua) && !device.windowsPhone)
        {
            device.safari = true;

            if (/Version\/(\d+)\./.test(ua))
            {
                device.safariVersion = parseInt(RegExp.$1, 10);
            }
        }
        else if (/Trident\/(\d+\.\d+)(.*)rv:(\d+\.\d+)/.test(ua))
        {
            device.ie = true;
            device.trident = true;
            device.tridentVersion = parseInt(RegExp.$1, 10);
            device.ieVersion = parseInt(RegExp.$3, 10);
        }

        //  Silk gets its own if clause because its ua also contains 'Safari'
        if (/Silk/.test(ua))
        {
            device.silk = true;
        }

        //  WebApp mode in iOS
        if (navigator['standalone'])
        {
            device.webApp = true;
        }
        
        if (typeof window.cordova !== 'undefined')
        {
            device.cordova = true;
        }
        
        if (typeof process !== 'undefined' && typeof require !== 'undefined')
        {
            device.node = true;
        }
        
        if (device.node && typeof process.versions === 'object')
        {
            device.nodeWebkit = !!process.versions['node-webkit'];
            
            device.electron = !!process.versions.electron;
        }
        
        if (navigator['isCocoonJS'])
        {
            device.cocoonJS = true;
        }
        
        if (device.cocoonJS)
        {
            try {
                device.cocoonJSApp = (typeof CocoonJS !== 'undefined');
            }
            catch(error)
            {
                device.cocoonJSApp = false;
            }
        }

        if (typeof window.ejecta !== 'undefined')
        {
            device.ejecta = true;
        }

        if (/Crosswalk/.test(ua))
        {
            device.crosswalk = true;
        }

    }

    /**
    * Check video support.
    */
    function _checkVideo () {

        var videoElement = document.createElement("video");
        var result = false;

        try {
            if (result = !!videoElement.canPlayType)
            {
                if (videoElement.canPlayType('video/ogg; codecs="theora"').replace(/^no$/, ''))
                {
                    device.oggVideo = true;
                }

                if (videoElement.canPlayType('video/mp4; codecs="avc1.42E01E"').replace(/^no$/, ''))
                {
                    // Without QuickTime, this value will be `undefined`. github.com/Modernizr/Modernizr/issues/546
                    device.h264Video = true;
                    device.mp4Video = true;
                }

                if (videoElement.canPlayType('video/webm; codecs="vp8, vorbis"').replace(/^no$/, ''))
                {
                    device.webmVideo = true;
                }

                if (videoElement.canPlayType('video/webm; codecs="vp9"').replace(/^no$/, ''))
                {
                    device.vp9Video = true;
                }

                if (videoElement.canPlayType('application/x-mpegURL; codecs="avc1.42E01E"').replace(/^no$/, ''))
                {
                    device.hlsVideo = true;
                }
            }
        } catch (e) {}
    }

    /**
    * Check audio support.
    */
    function _checkAudio () {

        device.audioData = !!(window['Audio']);
        device.webAudio = !!(window['AudioContext'] || window['webkitAudioContext']);
        var audioElement = document.createElement('audio');
        var result = false;

        try {
            if (result = !!audioElement.canPlayType)
            {
                if (audioElement.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/, ''))
                {
                    device.ogg = true;
                }

                if (audioElement.canPlayType('audio/ogg; codecs="opus"').replace(/^no$/, '') || audioElement.canPlayType('audio/opus;').replace(/^no$/, ''))
                {
                    device.opus = true;
                }

                if (audioElement.canPlayType('audio/mpeg;').replace(/^no$/, ''))
                {
                    device.mp3 = true;
                }

                // Mimetypes accepted:
                //   developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
                //   bit.ly/iphoneoscodecs
                if (audioElement.canPlayType('audio/wav; codecs="1"').replace(/^no$/, ''))
                {
                    device.wav = true;
                }

                if (audioElement.canPlayType('audio/x-m4a;') || audioElement.canPlayType('audio/aac;').replace(/^no$/, ''))
                {
                    device.m4a = true;
                }

                if (audioElement.canPlayType('audio/webm; codecs="vorbis"').replace(/^no$/, ''))
                {
                    device.webm = true;
                }

                if (audioElement.canPlayType('audio/mp4;codecs="ec-3"') !== '')
                {
                    if (device.edge)
                    {
                        device.dolby = true;
                    }
                    else if (device.safari && device.safariVersion >= 9)
                    {
                        if (/Mac OS X (\d+)_(\d+)/.test(navigator.userAgent))
                        {
                            var major = parseInt(RegExp.$1, 10);
                            var minor = parseInt(RegExp.$2, 10);

                            if ((major === 10 && minor >= 11) || major > 10)
                            {
                                device.dolby = true;
                            }
                        }
                    }
                }
            }
        } catch (e) {
        }

    }

    /**
    * Check Little or Big Endian system.
    *
    * @author Matt DesLauriers (@mattdesl)
    */
    function _checkIsLittleEndian () {

        var a = new ArrayBuffer(4);
        var b = new Uint8Array(a);
        var c = new Uint32Array(a);

        b[0] = 0xa1;
        b[1] = 0xb2;
        b[2] = 0xc3;
        b[3] = 0xd4;

        if (c[0] === 0xd4c3b2a1)
        {
            return true;
        }

        if (c[0] === 0xa1b2c3d4)
        {
            return false;
        }
        else
        {
            //  Could not determine endianness
            return null;
        }

    }

    /**
    * Test to see if ImageData uses CanvasPixelArray or Uint8ClampedArray.
    *
    * @author Matt DesLauriers (@mattdesl)
    */
    function _checkIsUint8ClampedImageData () {

        if (Uint8ClampedArray === undefined)
        {
            return false;
        }

        var elem = PIXI.CanvasPool.create(this, 1, 1);
        var ctx = elem.getContext('2d');

        if (!ctx)
        {
            return false;
        }

        var image = ctx.createImageData(1, 1);

        PIXI.CanvasPool.remove(this);

        return image.data instanceof Uint8ClampedArray;

    }

    /**
    * Check PixelRatio, iOS device, Vibration API, ArrayBuffers and endianess.
    */
    function _checkDevice () {

        device.pixelRatio = window['devicePixelRatio'] || 1;
        device.iPhone = navigator.userAgent.toLowerCase().indexOf('iphone') !== -1;
        device.iPhone4 = (device.pixelRatio === 2 && device.iPhone);
        device.iPad = navigator.userAgent.toLowerCase().indexOf('ipad') !== -1;

        if (typeof Int8Array !== 'undefined')
        {
            device.typedArray = true;
        }
        else
        {
            device.typedArray = false;
        }

        if (typeof ArrayBuffer !== 'undefined' && typeof Uint8Array !== 'undefined' && typeof Uint32Array !== 'undefined')
        {
            device.littleEndian = _checkIsLittleEndian();
            device.LITTLE_ENDIAN = device.littleEndian;
        }

        device.support32bit = (typeof ArrayBuffer !== 'undefined' && typeof Uint8ClampedArray !== 'undefined' && typeof Int32Array !== 'undefined' && device.littleEndian !== null && _checkIsUint8ClampedImageData());

        navigator.vibrate = navigator.vibrate || navigator.webkitVibrate || navigator.mozVibrate || navigator.msVibrate;

        if (navigator.vibrate)
        {
            device.vibration = true;
        }

    }

    /**
    * Check whether the host environment support 3D CSS.
    */
    function _checkCSS3D () {

        var el = document.createElement('p');
        var has3d;
        var transforms = {
            'webkitTransform': '-webkit-transform',
            'OTransform': '-o-transform',
            'msTransform': '-ms-transform',
            'MozTransform': '-moz-transform',
            'transform': 'transform'
        };

        // Add it to the body to get the computed style.
        document.body.insertBefore(el, null);

        for (var t in transforms)
        {
            if (el.style[t] !== undefined)
            {
                el.style[t] = "translate3d(1px,1px,1px)";
                has3d = window.getComputedStyle(el).getPropertyValue(transforms[t]);
            }
        }

        document.body.removeChild(el);
        device.css3D = (has3d !== undefined && has3d.length > 0 && has3d !== "none");

    }

    //  Run the checks
    _checkOS();
    _checkBrowser();
    _checkAudio();
    _checkVideo();
    _checkCSS3D();
    _checkDevice();
    _checkFeatures();
    _checkFullScreenSupport();
    _checkInput();

};

/**
* Check whether the host environment can play audio.
*
* @method canPlayAudio
* @memberof Phaser.Device.prototype
* @param {string} type - One of 'mp3, 'ogg', 'm4a', 'wav', 'webm' or 'opus'.
* @return {boolean} True if the given file type is supported by the browser, otherwise false.
*/
Phaser.Device.canPlayAudio = function (type) {

    if (type === 'mp3' && this.mp3)
    {
        return true;
    }
    else if (type === 'ogg' && (this.ogg || this.opus))
    {
        return true;
    }
    else if (type === 'm4a' && this.m4a)
    {
        return true;
    }
    else if (type === 'opus' && this.opus)
    {
        return true;
    }
    else if (type === 'wav' && this.wav)
    {
        return true;
    }
    else if (type === 'webm' && this.webm)
    {
        return true;
    }
    else if (type === 'mp4' && this.dolby)
    {
        return true;
    }

    return false;

};

/**
* Check whether the host environment can play video files.
*
* @method canPlayVideo
* @memberof Phaser.Device.prototype
* @param {string} type - One of 'mp4, 'ogg', 'webm' or 'mpeg'.
* @return {boolean} True if the given file type is supported by the browser, otherwise false.
*/
Phaser.Device.canPlayVideo = function (type) {

    if (type === 'webm' && (this.webmVideo || this.vp9Video))
    {
        return true;
    }
    else if (type === 'mp4' && (this.mp4Video || this.h264Video))
    {
        return true;
    }
    else if ((type === 'ogg' || type === 'ogv') && this.oggVideo)
    {
        return true;
    }
    else if (type === 'mpeg' && this.hlsVideo)
    {
        return true;
    }

    return false;

};

/**
* Check whether the console is open.
* Note that this only works in Firefox with Firebug and earlier versions of Chrome.
* It used to work in Chrome, but then they removed the ability: {@link http://src.chromium.org/viewvc/blink?view=revision&revision=151136}
*
* @method isConsoleOpen
* @memberof Phaser.Device.prototype
*/
Phaser.Device.isConsoleOpen = function () {

    if (window.console && window.console['firebug'])
    {
        return true;
    }

    if (window.console)
    {
        console.profile();
        console.profileEnd();

        if (console.clear)
        {
            console.clear();
        }

        if (console['profiles'])
        {
            return console['profiles'].length > 0;
        }
    }

    return false;

};

/**
* Detect if the host is a an Android Stock browser.
* This is available before the device "ready" event.
*
* Authors might want to scale down on effects and switch to the CANVAS rendering method on those devices.
*
* @example
* var defaultRenderingMode = Phaser.Device.isAndroidStockBrowser() ? Phaser.CANVAS : Phaser.AUTO;
* 
* @method isAndroidStockBrowser
* @memberof Phaser.Device.prototype
*/
Phaser.Device.isAndroidStockBrowser = function () {

    var matches = window.navigator.userAgent.match(/Android.*AppleWebKit\/([\d.]+)/);
    return matches && matches[1] < 537;

};
