app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var io = require('socket.io')();

var index = require('./routes/index');
var chat = require('./routes/chat');


var { generateMessage, generateLocationMessage } = require('./utils/message');
var { isRealString } = require('./utils/validation');
var { Users } = require('./utils/users');

var users = new Users();

var app = express();
app.io = io;

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/chat', chat);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

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

  console.log('New user connected');

  socket.on('join', (params, callback) => {

    if (!isRealString(params.name || !isRealString(params.room))) {
      return callback('Name and room name are required');
    }
    socket.join(params.room);

    users.removeUser(socket.id);
    users.addUser(socket.id, params.name, params.room);

    io.to(params.room).emit('updateUserList', users.getUserList(params.room));

    socket.emit('newMessage', generateMessage('Admin', 'Welcome to the chat app'));
    socket.broadcast.to(params.room).emit('newMessage', generateMessage('Admin', `${params.name} joined!`));

    callback();
  });

  socket.on('createMessage', (message, callback) => {
    var user = users.getUser(socket.id);
    if (user && isRealString(message.text)) {
      io.to(user.room).emit('newMessage', generateMessage(user.name, message.text));
    }
    callback();
  });

  socket.on('createLocationMessage', (coords) => {
    var user = users.getUser(socket.id);
    if (user) {
      io.to(user.room).emit('newLocationMessage', generateLocationMessage(user.name, coords.latitude, coords.longitude));
    }
  });

  socket.on('disconnect', () => {
    console.log('User is disconnected');
    var user = users.removeUser(socket.id);
    if (user) {
      io.to(user.room).emit('updateUserList', users.getUserList(user.room));
      io.to(user.room).emit('newMessage', generateMessage('Admin', `${user.name} has left`));
    }
  });
});


module.exports = app;