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

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

  getWebGLErrorMessage: function () {
    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" target="_blank" style="color:#000">WebGL</a>.<br />',
            'Find out how to get it <a href="http://get.webgl.org/" target="_blank" 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" target="_blank" style="color:#000">WebGL</a>.<br/>',
            'Find out how to get it <a href="http://get.webgl.org/" target="_blank" style="color:#000">here</a>.',
          ].join("\n");
    }

    return element;
  },

  addGetWebGLMessage: function (parameters) {
    var parent, elementID, element;

    parameters = parameters || {};
    parent =
      parameters.id !== undefined
        ? document.getElementById(parameters.id)
        : document.body;
    elementID =
      parameters.elementID !== undefined ? parameters.elementID : "oldie";

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

    parent.appendChild(element);
  },
};

// browserify support
if ( typeof module === 'object' ) {

	module.exports = Detector;

}