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var app = require('express').createServer()
var io = require('').listen(app);
// routing
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
// usernames which are currently connected to the chat
var usernames = {};
// rooms which are currently available in chat
var rooms = ['room1','room2','room3'];
io.sockets.on('connection', function (socket) {
// when the client emits 'adduser', this listens and executes
socket.on('adduser', function(username){
// store the username in the socket session for this client
socket.username = username;
// store the room name in the socket session for this client = 'room1';
// add the client's username to the global list
usernames[username] = username;
// send client to room 1
// echo to client they've connected
socket.emit('updatechat', 'SERVER', 'you have connected to room1');
// echo to room 1 that a person has connected to their room'room1').emit('updatechat', 'SERVER', username + ' has connected to this room');
socket.emit('updaterooms', rooms, 'room1');
// when the client emits 'sendchat', this listens and executes
socket.on('sendchat', function (data) {
// we tell the client to execute 'updatechat' with 2 parameters'updatechat', socket.username, data);
socket.on('switchRoom', function(newroom){
// leave the current room (stored in session)
// join new room, received as function parameter
socket.emit('updatechat', 'SERVER', 'you have connected to '+ newroom);
// sent message to OLD room'updatechat', 'SERVER', socket.username+' has left this room');
// update socket session room title = newroom;'updatechat', 'SERVER', socket.username+' has joined this room');
socket.emit('updaterooms', rooms, newroom);
// when the user disconnects.. perform this
socket.on('disconnect', function(){
// remove the username from global usernames list
delete usernames[socket.username];
// update list of users in chat, client-side
io.sockets.emit('updateusers', usernames);
// echo globally that this client has left
socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
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