// using express to handle routing
var express = require('express');
var app = express();

// http server for loading html pages
var http = require('http').Server(app);
// socket.io for handling websockets
var io = require('socket.io')(http)
var path = require('path');


app.get('/', function(req, res){
    res.sendFile(path.join(__dirname, 'index.html'));
});
// start node server
http.listen(8888, function(){
    console.log('listening on *:8888');
});
app.use(express.static(__dirname));

// event handler for when a client connects 
io.on('connection', function(socket){
    // socket ID is a unique identifier for this particular connection
    // it assigns a new one for every new browser connection, even if it's the same user.
    console.log(socket.id, "connected");

    // generate random hex color
    var color = ''+(Math.random()*0xFFFFFF<<0).toString(16);

    // cookies can be accessed as per usual from a socket connection
    console.log("cookies", socket.request.headers.cookie);
    
    // listen for messages from this client
    socket.on('newmessage', function(msg){
        console.log(msg);
        // broadcast the received message to all the other clients
        socket.broadcast.emit("newmessage", msg);
    });
    socket.on('cursor', function(msg){
        msg.color = color;
        // broadcast the message to ALL clients (including the sender)
        io.sockets.emit("cursor", msg);
    });

    socket.on('disconnect', function() {
        // remove this socket object from current online list
        console.log("disconnected", socket.id);
    });
});