//This should be uncommented when app.js supports require
//var RTCBrowserType = require("../../service/RTC/RTCBrowserType.js");

function setResolutionConstraints(constraints, resolution, isAndroid)
{
    if (resolution && !constraints.video || isAndroid) {
        constraints.video = { mandatory: {}, optional: [] };// same behaviour as true
    }
    // see https://code.google.com/p/chromium/issues/detail?id=143631#c9 for list of supported resolutions
    switch (resolution) {
        // 16:9 first
        case '1080':
        case 'fullhd':
            constraints.video.mandatory.minWidth = 1920;
            constraints.video.mandatory.minHeight = 1080;
            break;
        case '720':
        case 'hd':
            constraints.video.mandatory.minWidth = 1280;
            constraints.video.mandatory.minHeight = 720;
            break;
        case '360':
            constraints.video.mandatory.minWidth = 640;
            constraints.video.mandatory.minHeight = 360;
            break;
        case '180':
            constraints.video.mandatory.minWidth = 320;
            constraints.video.mandatory.minHeight = 180;
            break;
        // 4:3
        case '960':
            constraints.video.mandatory.minWidth = 960;
            constraints.video.mandatory.minHeight = 720;
            break;
        case '640':
        case 'vga':
            constraints.video.mandatory.minWidth = 640;
            constraints.video.mandatory.minHeight = 480;
            break;
        case '320':
            constraints.video.mandatory.minWidth = 320;
            constraints.video.mandatory.minHeight = 240;
            break;
        default:
            if (isAndroid) {
                constraints.video.mandatory.minWidth = 320;
                constraints.video.mandatory.minHeight = 240;
                constraints.video.mandatory.maxFrameRate = 15;
            }
            break;
    }
    if (constraints.video.mandatory.minWidth)
        constraints.video.mandatory.maxWidth = constraints.video.mandatory.minWidth;
    if (constraints.video.mandatory.minHeight)
        constraints.video.mandatory.maxHeight = constraints.video.mandatory.minHeight;
}


function getConstraints(um, resolution, bandwidth, fps, desktopStream, isAndroid)
{
    var constraints = {audio: false, video: false};

    if (um.indexOf('video') >= 0) {
        constraints.video = { mandatory: {}, optional: [] };// same behaviour as true
    }
    if (um.indexOf('audio') >= 0) {
        constraints.audio = { mandatory: {}, optional: []};// same behaviour as true
    }
    if (um.indexOf('screen') >= 0) {
        constraints.video = {
            mandatory: {
                chromeMediaSource: "screen",
                googLeakyBucket: true,
                maxWidth: window.screen.width,
                maxHeight: window.screen.height,
                maxFrameRate: 3
            },
            optional: []
        };
    }
    if (um.indexOf('desktop') >= 0) {
        constraints.video = {
            mandatory: {
                chromeMediaSource: "desktop",
                chromeMediaSourceId: desktopStream,
                googLeakyBucket: true,
                maxWidth: window.screen.width,
                maxHeight: window.screen.height,
                maxFrameRate: 3
            },
            optional: []
        };
    }

    if (constraints.audio) {
        // if it is good enough for hangouts...
        constraints.audio.optional.push(
            {googEchoCancellation: true},
            {googAutoGainControl: true},
            {googNoiseSupression: true},
            {googHighpassFilter: true},
            {googNoisesuppression2: true},
            {googEchoCancellation2: true},
            {googAutoGainControl2: true}
        );
    }
    if (constraints.video) {
        constraints.video.optional.push(
            {googNoiseReduction: false} // chrome 37 workaround for issue 3807, reenable in M38
        );
        if (um.indexOf('video') >= 0) {
            constraints.video.optional.push(
                {googLeakyBucket: true}
            );
        }
    }

    setResolutionConstraints(constraints, resolution, isAndroid);

    if (bandwidth) { // doesn't work currently, see webrtc issue 1846
        if (!constraints.video) constraints.video = {mandatory: {}, optional: []};//same behaviour as true
        constraints.video.optional.push({bandwidth: bandwidth});
    }
    if (fps) { // for some cameras it might be necessary to request 30fps
        // so they choose 30fps mjpg over 10fps yuy2
        if (!constraints.video) constraints.video = {mandatory: {}, optional: []};// same behaviour as true;
        constraints.video.mandatory.minFrameRate = fps;
    }

    return constraints;
}


function RTCUtils(RTCService)
{
    this.service = RTCService;
    if (navigator.mozGetUserMedia) {
        console.log('This appears to be Firefox');
        var version = parseInt(navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1], 10);
        if (version >= 22) {
            this.peerconnection = mozRTCPeerConnection;
            this.browser = RTCBrowserType.RTC_BROWSER_FIREFOX;
            this.getUserMedia = navigator.mozGetUserMedia.bind(navigator);
            this.pc_constraints = {};
            this.attachMediaStream =  function (element, stream) {
                element[0].mozSrcObject = stream;
                element[0].play();
            };
            this.getStreamID =  function (stream) {
                var tracks = stream.getVideoTracks();
                if(!tracks || tracks.length == 0)
                {
                    tracks = stream.getAudioTracks();
                }
                return tracks[0].id.replace(/[\{,\}]/g,"");
            };
            this.getVideoSrc = function (element) {
                return element.mozSrcObject;
            };
            this.setVideoSrc = function (element, src) {
                element.mozSrcObject = src;
            };
            RTCSessionDescription = mozRTCSessionDescription;
            RTCIceCandidate = mozRTCIceCandidate;
        }
    } else if (navigator.webkitGetUserMedia) {
        console.log('This appears to be Chrome');
        this.peerconnection = webkitRTCPeerConnection;
        this.browser = RTCBrowserType.RTC_BROWSER_CHROME;
        this.getUserMedia = navigator.webkitGetUserMedia.bind(navigator);
        this.attachMediaStream = function (element, stream) {
            element.attr('src', webkitURL.createObjectURL(stream));
        };
        this.getStreamID = function (stream) {
            // streams from FF endpoints have the characters '{' and '}'
            // that make jQuery choke.
            return stream.id.replace(/[\{,\}]/g,"");
        };
        this.getVideoSrc = function (element) {
            return element.getAttribute("src");
        };
        this.setVideoSrc = function (element, src) {
            element.setAttribute("src", src);
        };
        // DTLS should now be enabled by default but..
        this.pc_constraints = {'optional': [{'DtlsSrtpKeyAgreement': 'true'}]};
        if (navigator.userAgent.indexOf('Android') != -1) {
            this.pc_constraints = {}; // disable DTLS on Android
        }
        if (!webkitMediaStream.prototype.getVideoTracks) {
            webkitMediaStream.prototype.getVideoTracks = function () {
                return this.videoTracks;
            };
        }
        if (!webkitMediaStream.prototype.getAudioTracks) {
            webkitMediaStream.prototype.getAudioTracks = function () {
                return this.audioTracks;
            };
        }
    }
    else
    {
        try { console.log('Browser does not appear to be WebRTC-capable'); } catch (e) { }

        window.location.href = 'webrtcrequired.html';
        return;
    }

    if (this.browser !== RTCBrowserType.RTC_BROWSER_CHROME &&
        config.enableFirefoxSupport !== true) {
        window.location.href = 'chromeonly.html';
        return;
    }

}


RTCUtils.prototype.getUserMediaWithConstraints = function(
    um, success_callback, failure_callback, resolution,bandwidth, fps,
    desktopStream)
{
    // Check if we are running on Android device
    var isAndroid = navigator.userAgent.indexOf('Android') != -1;

    var constraints = getConstraints(
        um, resolution, bandwidth, fps, desktopStream, isAndroid);

    var isFF = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;

    try {
        if (config.enableSimulcast
            && constraints.video
            && constraints.video.chromeMediaSource !== 'screen'
            && constraints.video.chromeMediaSource !== 'desktop'
            && !isAndroid

            // We currently do not support FF, as it doesn't have multistream support.
            && !isFF) {
            simulcast.getUserMedia(constraints, function (stream) {
                    console.log('onUserMediaSuccess');
                    success_callback(stream);
                },
                function (error) {
                    console.warn('Failed to get access to local media. Error ', error);
                    if (failure_callback) {
                        failure_callback(error);
                    }
                });
        } else {

            this.getUserMedia(constraints,
                function (stream) {
                    console.log('onUserMediaSuccess');
                    success_callback(stream);
                },
                function (error) {
                    console.warn('Failed to get access to local media. Error ',
                        error, constraints);
                    if (failure_callback) {
                        failure_callback(error);
                    }
                });

        }
    } catch (e) {
        console.error('GUM failed: ', e);
        if(failure_callback) {
            failure_callback(e);
        }
    }
};

/**
 * We ask for audio and video combined stream in order to get permissions and
 * not to ask twice.
 */
RTCUtils.prototype.obtainAudioAndVideoPermissions = function() {
    var self = this;
    // Get AV
    var cb = function (stream) {
        console.log('got', stream, stream.getAudioTracks().length, stream.getVideoTracks().length);
        self.handleLocalStream(stream);
    };
    var self = this;
    this.getUserMediaWithConstraints(
        ['audio', 'video'],
        cb,
        function (error) {
            console.error('failed to obtain audio/video stream - trying audio only', error);
            self.getUserMediaWithConstraints(
                ['audio'],
                cb,
                function (error) {
                    console.error('failed to obtain audio/video stream - stop', error);
                    UI.messageHandler.showError("Error",
                            "Failed to obtain permissions to use the local microphone" +
                            "and/or camera.");
                }
            );
        },
            config.resolution || '360');
}

RTCUtils.prototype.handleLocalStream = function(stream)
{
    if(window.webkitMediaStream)
    {
        var audioStream = new webkitMediaStream();
        var videoStream = new webkitMediaStream();
        var audioTracks = stream.getAudioTracks();
        var videoTracks = stream.getVideoTracks();
        for (var i = 0; i < audioTracks.length; i++) {
            audioStream.addTrack(audioTracks[i]);
        }

        this.service.createLocalStream(audioStream, "audio");

        for (i = 0; i < videoTracks.length; i++) {
            videoStream.addTrack(videoTracks[i]);
        }


        this.service.createLocalStream(videoStream, "video");
    }
    else
    {//firefox
        this.service.createLocalStream(stream, "stream");
    }

};



module.exports = RTCUtils;