/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

utils.platform = {
  platform: function () {
    var version, webkitVersion, platform = {};

    var userAgent = (navigator.userAgent).toLowerCase();
    var language = navigator.language || navigator.browserLanguage;

    version = platform.version = (userAgent.match(/.*(?:rv|chrome|webkit|opera|ie)[\/: ](.+?)([ \);]|$)/) || [])[1];
    webkitVersion = (userAgent.match(/webkit\/(.+?) /) || [])[1];
    platform.windows = platform.isWindows = !!/windows/.test(userAgent);
    platform.mac = platform.isMac = !!/macintosh/.test(userAgent) || (/mac os x/.test(userAgent) && !/like mac os x/.test(userAgent));
    platform.lion = platform.isLion = !!(/mac os x 10_7/.test(userAgent) && !/like mac os x 10_7/.test(userAgent));
    platform.iPhone = platform.isiPhone = !!/iphone/.test(userAgent);
    platform.iPod = platform.isiPod = !!/ipod/.test(userAgent);
    platform.iPad = platform.isiPad = !!/ipad/.test(userAgent);
    platform.iOS = platform.isiOS = platform.iPhone || platform.iPod || platform.iPad;
    platform.android = platform.isAndroid = !!/android/.test(userAgent);
    platform.opera = /opera/.test(userAgent) ? version : 0;
    platform.isOpera = !!platform.opera;
    platform.msie = /msie/.test(userAgent) && !platform.opera ? version : 0;
    platform.isIE = !!platform.msie;
    platform.isIE8OrLower = !!(platform.msie && parseInt(platform.msie, 10) <= 8);
    platform.mozilla = /mozilla/.test(userAgent) && !/(compatible|webkit|msie)/.test(userAgent) ? version : 0;
    platform.isMozilla = !!platform.mozilla;
    platform.webkit = /webkit/.test(userAgent) ? webkitVersion : 0;
    platform.isWebkit = !!platform.webkit;
    platform.chrome = /chrome/.test(userAgent) ? version : 0;
    platform.isChrome = !!platform.chrome;
    platform.mobileSafari = /apple.*mobile/.test(userAgent) && platform.iOS ? webkitVersion : 0;
    platform.isMobileSafari = !!platform.mobileSafari;
    platform.iPadSafari = platform.iPad && platform.isMobileSafari ? webkitVersion : 0;
    platform.isiPadSafari = !!platform.iPadSafari;
    platform.iPhoneSafari = platform.iPhone && platform.isMobileSafari ? webkitVersion : 0;
    platform.isiPhoneSafari = !!platform.iphoneSafari;
    platform.iPodSafari = platform.iPod && platform.isMobileSafari ? webkitVersion : 0;
    platform.isiPodSafari = !!platform.iPodSafari;
    platform.isiOSHomeScreen = platform.isMobileSafari && !/apple.*mobile.*safari/.test(userAgent);
    platform.safari = platform.webkit && !platform.chrome && !platform.iOS && !platform.android ? webkitVersion : 0;
    platform.isSafari = !!platform.safari;
    platform.language = language.split("-", 1)[0];
    platform.current =
      platform.msie ? "msie" :
        platform.mozilla ? "mozilla" :
          platform.chrome ? "chrome" :
            platform.safari ? "safari" :
              platform.opera ? "opera" :
                platform.mobileSafari ? "mobile-safari" :
                  platform.android ? "android" : "unknown";

    function platformName(candidates) {
      for (var i = 0; i < candidates.length; i++) {
        if (candidates[i] in window) {
          return "window." + candidates[i];
        }
        if (candidates[i] in navigator) {
          return "navigator." + candidates[i];
        }
      }
      return undefined;
    }

    platform.GUM = platformName(['getUserMedia', 'webkitGetUserMedia', 'mozGetUserMedia', 'msGetUserMedia', 'getGUM']);
    platform.PeerConnection = platformName(['webkitRTCPeerConnection', 'mozRTCPeerConnection', 'msPeerConnection']);
    platform.IceCandidate = platformName(['mozRTCIceCandidate', 'RTCIceCandidate']);
    platform.SessionDescription = platformName(['mozRTCSessionDescription', 'RTCSessionDescription']);
    platform.URL = platformName(['URL', 'webkitURL']);
    platform.AudioContext = platformName(['AudioContext', 'webkitAudioContext']);
    platform.OfflineAudioContext = platformName(['OfflineAudioContext', 'webkitOfflineAudioContext']);
    platform.MediaSource = platformName(["MediaSource", "WebKitMediaSource"]);

    platform.SpeechRecognition = platformName(["SpeechRecognition", "webkitSpeechRecognition"]);
    platform.SpeechGrammarList = platformName(["SpeechGrammarList", "webkitSpeechGrammarList"]);

    function findWebGLContextName(candidates) {
      var canvas = document.createElement("canvas");
      for (var i=0; i<candidates.length; i++) {
        var name = candidates[i];
        try {
          if (canvas.getContext(name)) {
            return name;
          }
        } catch (e) {}
      }
      return null;
    }

    platform.WebGL = "webgl";//findWebGLContextName(["webgl", "experimental-webgl", "webkit-3d"]);
    platform.WebGL2 = "webgl2";//findWebGLContextName(["webgl2", "experimental-webgl2"]);

    platform.captureStreamUntilEnded = "captureStreamUntilEnded";
    if (platform.isMozilla) { platform.captureStreamUntilEnded = "mozCaptureStreamUntilEnded"; }

    platform.srcObject = "srcObject";
    if (platform.isMozilla) { platform.srcObject = "mozSrcObject"; }

    return platform;
  }
};