/*
Copyright (c) 2014, The WebRTC project authors. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

  * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

  * Neither the name of Google nor the names of its contributors may
    be used to endorse or promote products derived from this software
    without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

var RTCPeerConnection = null;
var getUserMedia = null;
var attachMediaStream = null;
var reattachMediaStream = null;
var webrtcDetectedBrowser = null;
var webrtcDetectedVersion = null;

if (navigator.mozGetUserMedia) {
  console.log('This appears to be Firefox');

  webrtcDetectedBrowser = 'firefox';

  webrtcDetectedVersion =
    parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);

  // The RTCPeerConnection object.
  window.RTCPeerConnection = function(pcConfig, pcConstraints) {
    // .urls is not supported in FF yet.
    if (pcConfig && pcConfig.iceServers) {
      for (var i = 0; i < pcConfig.iceServers.length; i++) {
        if (pcConfig.iceServers[i].hasOwnProperty('urls')) {
          pcConfig.iceServers[i].url = pcConfig.iceServers[i].urls;
          delete pcConfig.iceServers[i].urls;
        }
      }
    }
    return new mozRTCPeerConnection(pcConfig, pcConstraints);
  };

  // The RTCSessionDescription object.
  window.RTCSessionDescription = mozRTCSessionDescription;

  // The RTCIceCandidate object.
  window.RTCIceCandidate = mozRTCIceCandidate;

  // getUserMedia shim (only difference is the prefix).
  // Code from Adam Barth.
  getUserMedia = navigator.mozGetUserMedia.bind(navigator);
  navigator.getUserMedia = getUserMedia;

  // Creates ICE server from the URL for FF.
  window.createIceServer = function(url, username, password) {
    var iceServer = null;
    var urlParts = url.split(':');
    if (urlParts[0].indexOf('stun') === 0) {
      // Create ICE server with STUN URL.
      iceServer = {
        'url': url
      };
    } else if (urlParts[0].indexOf('turn') === 0) {
      if (webrtcDetectedVersion < 27) {
        // Create iceServer with turn url.
        // Ignore the transport parameter from TURN url for FF version <=27.
        var turnUrlParts = url.split('?');
        // Return null for createIceServer if transport=tcp.
        if (turnUrlParts.length === 1 ||
          turnUrlParts[1].indexOf('transport=udp') === 0) {
          iceServer = {
            'url': turnUrlParts[0],
            'credential': password,
            'username': username
          };
        }
      } else {
        // FF 27 and above supports transport parameters in TURN url,
        // So passing in the full url to create iceServer.
        iceServer = {
          'url': url,
          'credential': password,
          'username': username
        };
      }
    }
    return iceServer;
  };

  window.createIceServers = function(urls, username, password) {
    var iceServers = [];
    // Use .url for FireFox.
    for (var i = 0; i < urls.length; i++) {
      var iceServer =
        window.createIceServer(urls[i], username, password);
      if (iceServer !== null) {
        iceServers.push(iceServer);
      }
    }
    return iceServers;
  };

  // Attach a media stream to an element.
  attachMediaStream = function(element, stream) {
    console.log('Attaching media stream');
    element.mozSrcObject = stream;
  };

  reattachMediaStream = function(to, from) {
    console.log('Reattaching media stream');
    to.mozSrcObject = from.mozSrcObject;
  };

} else if (navigator.webkitGetUserMedia) {
  console.log('This appears to be Chrome');

  webrtcDetectedBrowser = 'chrome';
  // Temporary fix until crbug/374263 is fixed.
  // Setting Chrome version to 999, if version is unavailable.
  var result = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
  if (result !== null) {
    webrtcDetectedVersion = parseInt(result[2], 10);
  } else {
    webrtcDetectedVersion = 999;
  }

  // Creates iceServer from the url for Chrome M33 and earlier.
  window.createIceServer = function(url, username, password) {
    var iceServer = null;
    var urlParts = url.split(':');
    if (urlParts[0].indexOf('stun') === 0) {
      // Create iceServer with stun url.
      iceServer = {
        'url': url
      };
    } else if (urlParts[0].indexOf('turn') === 0) {
      // Chrome M28 & above uses below TURN format.
      iceServer = {
        'url': url,
        'credential': password,
        'username': username
      };
    }
    return iceServer;
  };

  // Creates an ICEServer object from multiple URLs.
  window.createIceServers = function(urls, username, password) {
    return [{
      'urls': urls,
      'credential': password,
      'username': username
    }];
  };

  // The RTCPeerConnection object.
  RTCPeerConnection = function(pcConfig, pcConstraints) {
    return new webkitRTCPeerConnection(pcConfig, pcConstraints);
  };

  // Get UserMedia (only difference is the prefix).
  // Code from Adam Barth.
  getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
  navigator.getUserMedia = getUserMedia;

  // Attach a media stream to an element.
  attachMediaStream = function(element, stream) {
    if (typeof element.srcObject !== 'undefined') {
      element.srcObject = stream;
    } else if (typeof element.mozSrcObject !== 'undefined') {
      element.mozSrcObject = stream;
    } else if (typeof element.src !== 'undefined') {
      element.src = URL.createObjectURL(stream);
    } else {
      console.log('Error attaching stream to element.');
    }
  };

  reattachMediaStream = function(to, from) {
    to.src = from.src;
  };
} else {
  console.log('Browser does not appear to be WebRTC-capable');
}