var express = require('express');
var bodyParser = require('body-parser');
var app = express();
var path = require('path');
var database = require('mongodb').MongoClient;
const jwt = require('jsonwebtoken');
const uuid = require('uuid/v4');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true } ));
app.use(express.static(path.join(__dirname,'dist')));

app.use((req,res,next) => {
    res.setHeader('Acess-Control-Allow-Origin', '*');
    res.setHeader('Acess-Control-Allow-Methods', 'GET, POST');
    res.setHeader('Acess-Control-Allow-Headers', 'X-Request-With,content-type');
    res.setHeader('Acess-Control-Allow-Credentials', true);
    next();
});

app.get('*', (req,res) => {
    res.sendFile(path.join(__dirname,'dist/index.html'));
});

app.post("/data", (req,res)  => {

    fullCookie = req.headers.cookie;
    cookies = fullCookie.split(';');

    for (i = 0; i < cookies.length; i++)
    {
        cookie = cookies[i];
        cookieKeyValue = cookie.split('=');

        if (cookieKeyValue[0] == 'token')
        {
            var isValid = jwt.verify(cookieKeyValue[1],'stupid', function(err,token)
            {
                if (err)
                {
                    response.set('Content-Type', 'text/plain');
                    response.send(JSON.stringify("{ \"ErrorMsg\":\"Invalid Token!\"}"));
                } else {
                    //send data
                }
            });
            break;
        }

    }



});

app.post("/login",(request, response) => {

    if (request.body.Username == "")
    {
        response.set('Content-Type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please enter your username\"}"));
    }
    if (request.body.Password == "")
    {
        response.set('Content-Type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please enter you password\"}"));
    }
    database.connect("mongodb://localhost:27017/integrated_test",function(err,db)
    {

        mydb = db.db('accounts');

        var findUser = {
            "Username" : request.body.Username,
            "Password" : request.body.Password
        };


        usersArray = mydb.collection('user').find(findUser).toArray(function(err,result)
        {

            mydb = db.db('accounts');
            if (result.length != 0)
            {
                var token;
                var secretKey = 'stupid';
                var UserInfo =
                {
                    "Username" : "" + request.body.Username,
                    "Password" : "" + request.body.Password,
                    "EMail" : "" +  request.body.EMail
                };

                token = jwt.sign(UserInfo,secretKey);
                response.cookie('token','' + token);
                response.set('content-type', 'text/plain');
                response.send(JSON.stringify("{ \"Succeded\": true, \"Token\":" + "\"" + token + "\"}"));

            } else {
                response.set('content-type', 'text/plain');
                response.send(JSON.stringify("{ \"ErrorMsg\":\"Error: Username or Password is incorrect.\"}"));
            }
        }
        );
    });



});


app.post("/register",(request, response) => {


    var succeded = true;
    console.log(request.body.EMail);

    var regExForMail = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

    if (request.body.Username == "")
    {
        response.set('Content-Type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please choose a username\"}"));

        succeded = false;
    } else
    if (request.body.EMail == "")
    {
        response.set('content-type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please enter an e-mail\"}"));
        succeded = false;
    } else
    if (request.body.Password == "")
    {
        response.set('content-type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please enter a password\"}"));
        succeded = false;
    } else
    if (regExForMail.test(request.body.EMail) == false)
    {
        response.set('content-type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Please enter a valid e-mail address\"}"));
        succeded = false;
    } else
    if (request.body.Password.length < 5)
    {
        response.set('content-type', 'text/plain');
        response.send(JSON.stringify("{ \"ErrorMsg\":\"Your password is too short.\"}"));
        succeded = false;
    }

    if (succeded)
    {
        database.connect("mongodb://localhost:27017/integrated_test",function(err,db)
        {

            mydb = db.db('accounts');

            var findUser = {
                "Username" : request.body.Username,
                "Password" : request.body.Password
            };

            usersArray = mydb.collection('user').find(findUser).toArray(function(err,result) {
            if (result.length != 0)
            {
                response.set('content-type', 'text/plain');
                response.send(JSON.stringify("{ \"ErrorMsg\":\"This e-mail has already been register.\"}"));

            } else {
                var token;
                var secretKey = 'stupid';
                var UserInfo =
                {
                    "Username" : "" + request.body.Username,
                    "Password" : "" + request.body.Password,
                    "EMail" : "" +  request.body.EMail
                };


                mydb.collection('user').insert( UserInfo );

                token = jwt.sign(UserInfo,secretKey);
                response.cookie('token','' + token);
                response.set('content-type', 'text/plain');
                response.send(JSON.stringify("{ \"Succeded\": true, \"Token\":" + "\"" + token + "\"}"));

            }


        }
        );

                });
    }

});

var server = app.listen(4000,(req,res)=>
{
    console.log('listening on port 4000');
});