const express = require('express');
const app = express();
const uuid = require('uuid/v4');
const cookieParser = require('cookie-parser');
const serveStatic = require('serve-static');
const expressSession = require('express-session');
const FileStore = require('session-file-store')(expressSession);
const bodyParser = require('body-parser');
const passport = require('passport');
const LocalStrategy = require('passport-local');
const path = require('path');

// Fake user
const user = { username: 'admin', password: 'admin'};

passport.use(new LocalStrategy(
  function(username, password, done) {
    if (username !== user.username) {
      return done(null, false);
    }

    if (password !== user.password) {
      return done(null, false);
    }

    return done(null, user);
  }
));

passport.serializeUser((user, done) => {
  done(null, user.username);
});

passport.deserializeUser((id, done) => {
  const checkedUser = user.username === id ? user : false;
  done(null, checkedUser);
});

app.use(serveStatic(path.join(__dirname + '/../api/build'), {
  index: false
}));

app.use(cookieParser());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(expressSession({
  genid: (req) => {
    return uuid() // use UUIDs for session IDs
  },
  store: new FileStore(),
  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: true
}));

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

app.set('views', path.join(__dirname, 'views'));

// Set Pug as template engine.
app.set('view engine', 'pug');

app.get('/', (req, res) => {
  if (req.user) {
    res.redirect('/v1'); // User already logged in
  } else {
    res.render('index'); // Unauthorized users must log in first
  }
});

app.post('/', passport.authenticate('local', {
  successRedirect: '/v1', // authentication succeeded
  failureRedirect: '/' // // authentication failed
}));

// show this page only if user is logged in
app.get('/v1', passport.authorize('local', { failureRedirect: '/' }), (req, res) => {
  res.sendFile(path.join(__dirname + '/../api/build/index.html'));
});

app.listen(process.env.PORT || 8080);