// Include dependencies
var app = require('express')();
var http = require('http').createServer(app);
var io = require('socket.io')(http)

// Set variables
const port = 9966;
var users = 0;

// Function for easy server broadcasts
function serverMsg(content) {
    return {
        'username': 'Server',
        'mailHash': '470965550d3f019830c421f0535d9268',
        'message': content
    }
}

// Serve Client
app.get('/', function(req, res){
    res.sendFile(__dirname + '/index.html');
});

// Socket.io server side
io.on('connection', function (socket) {
    // Send identification request to client
    socket.emit('user_identify');

    // Bind username and mailhash to client
    socket.on('user_login', function (user) {
        socket.username = user.username;
        socket.mailHash = user.mailHash;
        io.emit('message_receive', serverMsg(`${socket.username} has connected`));
        users++;
    });

    // Send disconnect broadcast to all clients
    socket.on('disconnect', function () {
        io.emit('message_receive', serverMsg(`${socket.username} has disconnected`));
        users--;
    });

    // Handle messages
    socket.on('message_send', function (message) {
        // Build message data for clients
        if (message !== '') {
            var msg = {
                'username': socket.username,
                'mailHash': socket.mailHash,
                'message': message
            }
            // Send message to clients
            io.emit('message_receive', msg);
        } else {
            socket.emit('message_receive', serverMsg(`Empty messages will not be sent.`));
        }
    });
});

// Start http server
http.listen(port, function() {
    console.log(`Listening on port ${port}`);
});