server.js

// npm packages required / dependencies
const express = require("express");
const bodyParser = require("body-parser");
const routes = require("./routes")

// sets up the Express App
const app = require("express")();
// sets the environment variable PORT to tell the web server what port to listen on
const PORT = process.env.PORT || 3001;

// serves up static assets (usually on heroku)
if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/build"));
}

// configures body parser for AJAX requests and
// sets up the Express app to handle data parsing
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(bodyParser.text());
app.use(bodyParser.json({ type: "application/vnd.api+json" }));

// adds routes, both API and view
app.use(routes);

// requires models for syncing
var db = require("./models")

// integrates socket.io
const http = require('http').Server(app);
// initializes a new instance of socket.io
// by passing the http (the HTTP server) object
const io = require('socket.io')(http);
// listens on the connection event for incoming sockets,
//  and logs it to the console.
io.on('connection', function (socket) {
  console.log('a user connected');
  // listens on 'checkIn' event
  socket.on('checkIn', function (id) {
    console.log('checked in into workshop: ' + id);
    // sends id to everyone except for a certain socket
    // uses broadcast flag
    socket.broadcast.emit('checkedIn', id);
  });
  // socket.on('disconnect', function () {
  //   console.log('Got disconnect!');
  // });
});

// syncs the sequelize models and then connects the Express app
db.sequelize.sync().then(function () {
  http.listen(PORT, function () {
    console.log(`🌎 ==> Server now on port ${PORT}!`);
  });
});