/**
 * @author alteredq / http://alteredqualia.com/
 * @author mr.doob / http://mrdoob.com/
 */

var Detector = {

    canvas: !! window.CanvasRenderingContext2D,
    webgl: ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( "canvas" ).getContext( "experimental-webgl" ); } catch( e ) { return false; } } )(),
    workers: !! window.Worker,
    fileapi: window.File && window.FileReader && window.FileList && window.Blob,

    getWebGLErrorMessage() {

        var element = document.createElement( "div" );
        element.id = "webgl-error-message";
        element.style.fontFamily = "monospace";
        element.style.fontSize = "13px";
        element.style.fontWeight = "normal";
        element.style.textAlign = "center";
        element.style.background = "#fff";
        element.style.color = "#000";
        element.style.padding = "1.5em";
        element.style.width = "400px";
        element.style.margin = "5em auto 0";

        if ( ! this.webgl ) {

            element.innerHTML = window.WebGLRenderingContext ? [
                "Your graphics card does not seem to support <a href=\"http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation\" style=\"color:#000\">WebGL</a>.<br />",
                "Find out how to get it <a href=\"http://get.webgl.org/\" style=\"color:#000\">here</a>."
            ].join( "\n" ) : [
                "Your browser does not seem to support <a href=\"http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation\" style=\"color:#000\">WebGL</a>.<br/>",
                "Find out how to get it <a href=\"http://get.webgl.org/\" style=\"color:#000\">here</a>."
            ].join( "\n" );

        }

        return element;

    },

    addGetWebGLMessage( parameters ) {

        var parent, id, element;

        parameters = parameters || {};

        parent = typeof parameters.parent !== "undefined" ? parameters.parent : document.body;
        id = typeof parameters.id !== "undefined" ? parameters.id : "oldie";

        element = Detector.getWebGLErrorMessage();
        element.id = id;

        parent.appendChild( element );

    }

};
