server.js

var express = require('express');
var app = express();
var server = require('http').Server(app);
var io = require('socket.io').listen(server);
var players = {};

var star = {
    x: Math.floor(Math.random() * 700) + 50,
    y: Math.floor(Math.random() * 500) + 50
  };

  var scores = {
    blue: 0,
    red: 0
};

app.use(express.static(__dirname + '/public'));

io.on('connection', function (socket) {

    console.log('a user connected'); 

    players[socket.id] = {
        rotation: 0,
        x: Math.floor(Math.random() * 700) + 50,
        y: Math.floor(Math.random() * 500) + 50,
        playerId: socket.id,
        team: (Math.floor(Math.random() * 2) == 0) ? 'red' : 'blue'
    };
    
    socket.emit('currentPlayers', players); 

    socket.broadcast.emit('newPlayer', players[socket.id]);

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

      console.log('user disconnected');
      delete players[socket.id];
      io.emit('disconnect', socket.id);

    }); 
 
    // when a player moves, update the player data
    socket.on('playerMovement', function (movementData) {
        players[socket.id].x = movementData.x;
        players[socket.id].y = movementData.y;
        players[socket.id].rotation = movementData.rotation;
        // emit a message to all players about the player that moved
        socket.broadcast.emit('playerMoved', players[socket.id]);
    });

    // send the star object to the new player
    socket.emit('starLocation', star);

    socket.on('starCollected', function () {
        if (players[socket.id].team === 'red') {
          scores.red += 10;
        } else {
          scores.blue += 10;
        }
        star.x = Math.floor(Math.random() * 700) + 50;
        star.y = Math.floor(Math.random() * 500) + 50;
        io.emit('starLocation', star);
        io.emit('scoreUpdate', scores);
    }); 
    
    socket.emit('scoreUpdate', scores);


});

// app.get('/', function (req, res) {
//   res.sendFile(__dirname + '/index.html');
// });
 
server.listen(process.env.PORT || 8081, function () {
  console.log(`Listening on ${server.address().port}`);
});