/* CONFIGURATION */

var OpenVidu = require('openvidu-node-client').OpenVidu;
var Session = require('openvidu-node-client').Session;
var OpenViduRole = require('openvidu-node-client').OpenViduRole;
var TokenOptions = require('openvidu-node-client').TokenOptions;

// Check launch arguments: must receive openvidu-server URL and the secret
if (process.argv.length != 4) {
    console.log("Usage: node " + __filename + " OPENVIDU_URL OPENVIDU_SECRET");
    process.exit(-1);
}
// For demo purposes we ignore self-signed certificate
process.env.NODE_TLS_REJECT_UNAUTHORIZED = "0"

// Node imports
var express = require('express');
var fs = require('fs');
var session = require('express-session');
var https = require('https');
var bodyParser = require('body-parser'); // Pull information from HTML POST (express4)
var app = express(); // Create our app with express

// Server configuration
app.use(session({
    saveUninitialized: true,
    resave: false,
    secret: 'MY_SECRET'
}));
app.use(express.static(__dirname + '/public')); // set the static files location
app.use(bodyParser.urlencoded({
    'extended': 'true'
})); // Parse application/x-www-form-urlencoded
app.use(bodyParser.json()); // parse application/json
app.use(bodyParser.json({
    type: 'application/vnd.api+json'
})); // Parse application/vnd.api+json as json
app.set('view engine', 'ejs'); // Embedded JavaScript as template engine

// Listen (start app with node server.js)
var options = {
    key: fs.readFileSync('openvidukey.pem'),
    cert: fs.readFileSync('openviducert.pem')
};
https.createServer(options, app).listen(5000);
console.log("App listening on https://localhost:5000");

// Mock database
var users = [{
    user: "publisher1",
    pass: "pass",
    role: OpenViduRole.PUBLISHER
}, {
    user: "publisher2",
    pass: "pass",
    role: OpenViduRole.PUBLISHER
}, {
    user: "subscriber",
    pass: "pass",
    role: OpenViduRole.SUBSCRIBER
}];

// Environment variables
var OPENVIDU_URL = process.argv[2];
var OPENVIDU_SECRET = process.argv[3];

// OpenVidu object
var OV = new OpenVidu(OPENVIDU_URL, OPENVIDU_SECRET);

// Objects for storing active sessions and users
var mapSessionNameSession = {};
var mapSessionIdTokens = {};

/* CONFIGURATION */



/* REST API */

app.post('/', loginController);
app.get('/', loginController);

function loginController(req, res) {
    if (req.session.loggedUser) { // User is logged
        user = req.session.loggedUser;
        res.redirect('/dashboard');
    } else { // User is not logged
        req.session.destroy();
        res.render('index.ejs');
    }
}

app.post('/logout', (req, res) => {
    req.session.destroy();
    res.redirect('/');
});

app.post('/dashboard', dashboardController);
app.get('/dashboard', dashboardController);

function dashboardController(req, res) {

    if (isLogged(req.session)) {
        user = req.session.loggedUser;
        res.render('dashboard.ejs', {
            user: user
        });
    } else {
        var user = req.body.user;
        var pass = req.body.pass;
        console.log("Logging in | {user, pass}={" + user + ", " + pass + "}");

        if (login(user, pass)) {
            console.log("'" + user + "' has logged in");
            req.session.loggedUser = user;
            res.render('dashboard.ejs', {
                user: user
            });
        } else {
            console.log("'" + user + "' invalid credentials");
            req.session.destroy();
            res.redirect('/');
        }
    }
}

app.post('/session', (req, res) => {
    if (!isLogged(req.session)) {
        req.session.destroy();
        res.redirect('/');
    } else {
        var clientData = req.body.data;
        var sessionName = req.body.sessionname;
        var role = users.find(u => (u.user === req.session.loggedUser)).role;
        var serverData = '{"serverData": "' + req.session.loggedUser + '"}';
        console.log("Getting sessionId and token | {sessionName}={" + sessionName + "}");

        var tokenOptions = new TokenOptions.Builder()
            .data(serverData)
            .role(role)
            .build();

        if (mapSessionNameSession[sessionName]) {
            console.log('Existing session ' + sessionName);
            var mySession = mapSessionNameSession[sessionName];
            mySession.generateToken(tokenOptions, function (token) {
                var sessionId = mySession.getSessionId();
                mapSessionIdTokens[sessionId].push(token);
                console.log('SESSIONID: ' + sessionId);
                console.log('TOKEN: ' + token);
                res.render('session.ejs', {
                    sessionId: sessionId,
                    token: token,
                    nickName: clientData,
                    userName: req.session.loggedUser,
                    sessionName: sessionName
                });
            });
        } else {
            console.log('New session ' + sessionName);
            var mySession = OV.createSession();
            mySession.getSessionId(function (sessionId) {
                mapSessionNameSession[sessionName] = mySession;
                mapSessionIdTokens[sessionId] = [];

                mySession.generateToken(tokenOptions, function (token) {
                    mapSessionIdTokens[sessionId].push(token);
                    console.log('SESSIONID: ' + sessionId);
                    console.log('TOKEN: ' + token);
                    res.render('session.ejs', {
                        sessionId: sessionId,
                        token: token,
                        nickName: clientData,
                        userName: req.session.loggedUser,
                        sessionName: sessionName
                    });
                });
            });
        }
    }
});

app.post('/leave-session', (req, res) => {
    if (!isLogged(req.session)) {
        req.session.destroy();
        res.render('index.ejs');
    } else {
        var sessionName = req.body.sessionname;
        var token = req.body.token;
        console.log('Removing user | {sessionName, token}={' + sessionName + ', ' + token + '}');

        var mySession = mapSessionNameSession[sessionName];
        if (mySession) {
            var tokens = mapSessionIdTokens[mySession.getSessionId()];
            if (tokens) {
                var index = tokens.indexOf(token);
                if (index !== -1) { // User left the session
                    tokens.splice(index, 1);
                    console.log(sessionName + ': ' + mapSessionIdTokens[mySession.getSessionId()].toString());
                } else {
                    var msg = 'Problems in the app server: the TOKEN wasn\'t valid';
                    console.log(msg);
                    res.redirect('/dashboard');
                }
                if (mapSessionIdTokens[mySession.getSessionId()].length == 0) { // Last user left the session
                    console.log(sessionName + ' empty!');
                    delete mapSessionNameSession[sessionName];
                }
                res.redirect('/dashboard');
            } else {
                var msg = 'Problems in the app server: the SESSIONID wasn\'t valid';
                console.log(msg);
                res.redirect('/dashboard');
            }
        } else {
            var msg = 'Problems in the app server: the SESSION does not exist';
            console.log(msg);
            res.redirect('/dashboard');
        }
    }
});

/* REST API */



/* AUXILIARY METHODS */

function login(user, pass) {
    return (user != null &&
        pass != null &&
        users.find(u => (u.user === user) && (u.pass === pass)));
}

function isLogged(session) {
    return (session.loggedUser != null);
}

function getBasicAuth() {
    return 'Basic ' + (new Buffer('OPENVIDUAPP:' + OPENVIDU_SECRET).toString('base64'));
}

/* AUXILIARY METHODS */