const express = require('express');

const app = express();

// Import path and file system libraries for importing our route files

const path = require('path');

const fs = require('fs');

// Import library for handling HTTP errors

const createError = require('http-errors');

// Import library for working with JWT tokens

const jwt = require('jwt-simple');

// import our config file and get the secret value

const config = require('./config');

const secret = config.secret;

// Check if the requesting client has checked in

function isCheckedIn(req, res, next) {

// Check that authorization header was sent

if (req.headers.authorization) {

// Get token from "Bearer: Token" string

let token = req.headers.authorization.split(" ")[1];

// Try decoding the client's JWT using the server secret

try {

req._guest = jwt.decode(token, secret);

} catch {

res.status(403).json({ error: 'Token is not valid.' });

}

// If the decoded object has a name protected route can be used

if (req._guest.name) return next();

}

// If no authorization header or guest has no name return a 403 error

res.status(403).json({ error: 'Please check-in to recieve a token.' });

}

// Tell express to enable url encoding

app.use(express.urlencoded({extended: true}));

app.use(express.json());

// Import our index route

let index = require('./routes/index');

let checkIn = require('./routes/check-in');

let light = require('./routes/devices/light');

// Tell Express to use our index module for root URL

app.use('/', index);

app.use('/check-in', checkIn);

app.use('/devices/light', light);

app.use('/devices/restricted-light', isCheckedIn, light);

// catch 404 and forward to error handler

app.use(function(req, res, next) {

res.status(404);

res.json(createError(404));

});

// Start our application on port 3000

app.listen(3000, () => console.log('API running on port 3000'));