index.js

const express = require('express');
const mongoose = require('mongoose');
const cookieSession = require('cookie-session');
const passport = require('passport'); // passport is to say use them to cookie
const keys = require('./config/keys');
const bodyParser = require('body-parser');

require('./models/User'); // model being created first and passport the second
require('./services/passport');
require('./models/Survey');

//connceting to the moongoose database
mongoose.Promise = global.Promise;
mongoose.connect(keys.mongoURI, { useNewUrlParser: true,  useUnifiedTopology: true });

const app = express();
app.use(bodyParser.json());

app.use(
	cookieSession({
		maxAge: 30 * 24 * 60 * 60 * 1000,
		keys: [keys.cookieKey],
	})
);

app.use(passport.initialize());
app.use(passport.session());

require('./routes/authRoutes')(app);
require('./routes/surveyRoutes')(app);
require('./routes/billingRoutes')(app);
// authRoute and billing Route export a function, so this require statement is turning into a function which we immediately call with the expressess app object

// valid
// mathi ko second function lee, immediately invokes the function that is required in.

// for the production line NODE_ENV is automatically generated by heroku
if (process.env.NODE_ENV === 'production') {
	//Express will server up the production assets
	//Like our main.js or  main.css files
	app.use(express.static('client/build'));

	//Express will serve up index.html file
	//if it does not recognoize the route
	const path = require('path');
	app.get('*', (req, res) => {
		res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
	});
}

const PORT = process.env.PORT || 5000;
app.listen(PORT);