/**
 * Node Signal Exchanger test client
 * 
 * @author Pierre HUBERT
 */

function byId(id){
    return document.getElementById(id);
}

const Config = {
    port: 8081,
    server_name: "localhost",
    clientID: location.href.toString().includes("#1") ? "client-1" : "client-2",
    otherPeerID: location.href.toString().includes("#1") ? "client-2" : "client-1"
};

let client = new SignalExchangerClient(
    Config.server_name, 
    Config.port, 
    Config.clientID
);

let peer;
let localStream;

client.onConnected = function(){
    console.log("Connected to signal exchanger server.");

    InitializeVideo();
}

client.onError = function() {
    console.error("An error occurred with the connection to the signal exchanger server");
}

client.onClosed = function() {
    console.log("Connection to server closed.");
}

client.onSignal = function(signal, peerID){

    if(peerID !== Config.otherPeerID)
        return alert("A signal from an unknow peer ID has just been received!");

    peer.signal(JSON.parse(signal));


}

function InitializeVideo(){

    navigator.mediaDevices
        .getUserMedia({
            audio: true,
            video: true
        })
        .then(stream => {
            localStream = stream;
            
            InitializePeer();

            //Play local video
            let video = byId("localVideo");
            video.srcObject = stream;
            video.play();
        })
        .catch(err => {
            alert("Can not continue because you did not accept to share your camera!");
            console.error(err);
        });

}

/**
 * Initialize peer connection
 * 
 * Warning : It is better to wait for the socket connection to be ready before
 * launching this function if this peer is the initiator of the connection
 */
function InitializePeer() {

    peer = new SimplePeer({ 
        initiator: location.hash === '#1',
        stream: localStream,
        trickle: false,
        config: {
            'iceServers': [
            { urls: 'stun:127.0.0.1:3478' },
            {"url":"turn:127.0.0.1:3478", 
                                    "credential":"anonymous",
                                    "username": "anonymous"}
            ]
        }
    });

    peer.on('error', function (err) { console.log('SimplePeer error', err) });

    //Automatically send new signals to the other peer
    peer.on('signal', function (data) {
        console.log('SIGNAL', JSON.stringify(data))
        client.sendSignal(Config.otherPeerID, JSON.stringify(data));
    });

    peer.on("stream", stream => {
        let video = byId("remoteVideo");
            video.srcObject = stream;
            video.play();
    });

    peer.on("message", message => {
        console.log("Message from remote peer: " + message);
    });
}