var device = {
    MIN_TIMESTEP: 0.001,
    MAX_TIMESTEP : 1,
    canvas : undefined,
    base64: function (mimeType, base64) {
        return 'data:' + mimeType + ';base64,' + base64;
    },
    clamp: function (value, min, max) {
        return Math.min(Math.max(min, value), max);
    },
    lerp: function (a, b, t) {
        return a + ((b - a) * t);
    },
    race: function (promises) {
        if (Promise.race) {
            return Promise.race(promises);
        }

        return new Promise(function (resolve, reject) {
            for (var i = 0; i < promises.length; i++) {
                promises[i].then(resolve, reject);
            }
        });
    },
    isIOS: function () {
        var isIOS = /iPad|iPhone|iPod/.test(navigator.platform);
        return isIOS;
    },
    isWebViewAndroid: function () {
        var isWebViewAndroid = navigator.userAgent.indexOf('Version') !== -1 && navigator.userAgent.indexOf('Android') !== -1 && navigator.userAgent.indexOf('Chrome') !== -1;
        return isWebViewAndroid;
    },
    isSafari: function () {
        var isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
        return isSafari;
    },
    isFirefoxAndroid: function () {
        var isFirefoxAndroid = navigator.userAgent.indexOf('Firefox') !== -1 && navigator.userAgent.indexOf('Android') !== -1;
        return isFirefoxAndroid;
    },
    isLandscapeMode: function () {
        return (window.orientation == 90 || window.orientation == -90);
    },
    isTimestampDeltaValid: function (timestampDeltaS) {
        if (isNaN(timestampDeltaS)) {
            return false;
        }
        if (timestampDeltaS <= this.MIN_TIMESTEP) {
            return false;
        }
        if (timestampDeltaS > this.MAX_TIMESTEP) {
            return false;
        }
        return true;
    },
    
    
    isMobile: function () {
        var check = false;
        (function (a) {
            if (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od|ad)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4)))
                check = true
        })(navigator.userAgent || navigator.vendor || window.opera);
        return check;
    },
   
    safariCssSizeWorkaround: function (canvas) {
        // TODO(smus): Remove this workaround when Safari for iOS is fixed.
        // iOS only workaround (for https://bugs.webkit.org/show_bug.cgi?id=152556).
        //
        // "To the last I grapple with thee;
        //  from hell's heart I stab at thee;
        //  for hate's sake I spit my last breath at thee."
        // -- Moby Dick, by Herman Melville
        if (this.isIOS()) {
            var width = canvas.style.width;
            var height = canvas.style.height;
            canvas.style.width = (parseInt(width) + 1) + 'px';
            canvas.style.height = (parseInt(height)) + 'px';
            setTimeout(function () {
                canvas.style.width = width;
                canvas.style.height = height;
            }, 100);
        }

        // Debug only.
        // window.Util = Util;
        this.canvas = canvas;
    },

    isSupportWebGL:function(){
        try {
            var canvas = document.createElement( 'canvas' );
            return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' )));
		} catch ( e ) {
			return false;
		}
    }
}