var express = require('express');
var bodyParser = require('body-parser');
var session = require('express-session');
var morgan = require('morgan');
var User = require('./model/user');
var cookieParser = require('cookie-parser');

// Create instance of express app
var app = express();

// set the port for the app
app.set('port',3000);

// set the view engine and where views are located
app.set('view engine', 'ejs');
app.set('views', 'views');

// set morgan to log info about app
app.use(morgan('dev'));

app.use(cookieParser());

// initializing body-parser to parse incoming parameters from requests to req.body
app.use(bodyParser.urlencoded({extended:true}));

// initializing express-session to track logged in user across sessions
app.use(session({
    key: 'user_sid',
    secret: 'some-private-key',
    resave: false,
    saveUninitialized: false,
    cookie:{
        expires: 600000
    }
}));

// This middleware will check if user's cookie is still saved in browser and user is not set, then automatically log the user out.
// This usually happens when you stop your express server after login, your cookie still remains saved in the browser.
app.use((req, res, next) => {
    if (req.cookies.user_sid && !req.session.user) {
        res.clearCookie('user_sid');
    }
    next();
});

var sessionChecker = (req, res, next) => {
    if (req.session.user === undefined ){ //&& !req.cookies.user_sid
        req.session.redirect_to = req.path;
        res.redirect('/login');
    }else{
        next();
    }
};

// Route for when signup page is requested via get
app.get('/signup', function(req, res){
    res.render('signup');
});

app.post('/signup', function(req, res) {
    var userInfo = {
                    username : req.body.username,
                    password : req.body.password,
                    email    : req.body.email,
                    roles    : req.body.roles
                };

    var createdUser = User.create(userInfo);

    if (createdUser){
        req.session.user = userInfo;

        res.redirect('/loggedin');
    }else{
        res.redirect('/signup');
    }

});

app.get('/login', function(req, res){
    res.render('login');
});

app.post('/login', function(req, res){
    var userInfo = {
        username : req.body.username,
        password : req.body.password
    }

    var validate = User.validatePassword(userInfo);

    if (validate){
        req.session.user = userInfo;

        //res.redirect('/loggedin');
        res.redirect('/loggedin');
    }
});

// route for user logout
app.get('/logout', (req, res) => {
    if (req.session.user && req.cookies.user_sid) {
        res.clearCookie('user_sid');
        res.render('login');;
    } else {
        res.render('login');;
    }
});

app.get('/loggedin', sessionChecker, function(req, res){
    res.render('loggedin',{
        user: req.session.user
    });
});

app.get('/newpage', sessionChecker, (req, res) => {
    res.render('newpage',{
        user: req.session.user
    });
});

app.get('/userprofile', sessionChecker, (req, res) => {
    res.render('userprofile',{
        user: req.session.user
    });
});

// Starting app server on port
// start the express server
app.listen(app.get('port'), () => console.log(`App started on port ${app.get('port')}`));