var DEBUG = true
var INIT_MESSAGES = 5

var messages = new Array()

Array.prototype.inject = function(element) {

    if (this.length >= INIT_MESSAGES) {
        this.shift()
    }
    this.push(element)
}

// "start" will launch the chatserver and simply broadcast whatever comes in to all clients
// returning the io socket on which it listens
exports.start = function(app)
{
    var io = require('socket.io').listen(app);

    // heroku does not yet support websockets, so advices the following according to:
    // https://devcenter.heroku.com/articles/using-socket-io-with-node-js-on-heroku
    io.configure(function () {
        io.set("transports", ["xhr-polling"]);
        io.set("polling duration", 10);
    });


    io.sockets.on('connection', function(client) {

        if (DEBUG)
            console.log("New Connection: ", client.id)

        client.emit("init", JSON.stringify(messages))

        client.on('msg', function(msg) {

            if (DEBUG)
                console.log("Message: " + msg)

            var message = JSON.parse(msg)
            messages.inject(message)

            client.broadcast.emit('msg', msg)
        })

        client.on('disconnect', function() {

            if (DEBUG)
                console.log("Disconnected: ", client.id)
        })
    })
    return io;
}