/**
 * To get started install
 * express bodyparser jsonwebtoken express-jwt
 * via npm
 * command :-
 * npm install express bodyparser jsonwebtoken express-jwt --save
 */

// Bringing all the dependencies in
const express = require('express');
const bodyParser = require('body-parser');
const jwt = require('jsonwebtoken');
const exjwt = require('express-jwt');

// Instantiating the express app
const app = express()

// Setting up bodyParser to use URL ENCODED and set it to req.body
app.use(bodyParser.urlencoded({ extended: true }))

// INstantiating the express-jwt middleware
const jwtMW = exjwt({
    secret: "keyboard cat 4 ever"
})

// MOCKING DB just for test
let users = [
    {
        id: 1,
        username: "test",
        password: "asdf123"
    },
    {
        id: 2,
        username: "test2",
        password: "asdf12345"
    }
]

// LOGIN ROUTE
app.post('/login', (req, res) => {
    const { username, password } = req.body;
    // Use your DB ORM logic here to find user and compare password
    for (let user of users) { // I am using a simple array users which i made above
        if (username == user.username && password == user.password /* Use your password hash checking logic here !*/) {
            //If all credentials are correct do this
            let token = jwt.sign({ id: user.id }, "keyboard cat 4 ever", { expiresIn: 129600 }) // Sigining the token
            res.json({
                sucess: true,
                err: null,
                token
            })
            break;
        }
        else {
            res.json({
                sucess: false,
                token: null,
                err: "Username or password is incorrect"
            })
        }
    }
})

app.get('/', jwtMW /* Using the express jwt MW here */, (req, res) => {
    res.send("You are authenticated") //Sending some response when authenticated
})

// Starting the app on PORT 3000
const PORT = 3000;
app.listen(PORT, () => {
    console.log(`Magic happens on port ${PORT}`)
})