const session = require("../app.js").session;

function doLogin(req, res) {

    var username = req.body.username;
    var password = req.body.password;

    createPromise(username)
        .then((result) => {
            dataNotNull(result)
        }, console.log("Reject"))
        .then((result) => {
            passCorrect(result, password)
        }, console.log("Reject"))
        .then(dataResolved(res), console.log("Reject"));


}



function createPromise(username) {
    return new Promise((resolve, reject) => {

        console.log("Promise begin");
        let request = require('request');

        request("http://localhost:3000/Users?name=" + username, (error, response, body) => {

            console.log("Callback 1");
            if (!error && response.statusCode === 200) {


                resolve(body);

            }
            else {

                reject();
            }

        });


    })
}


function dataNotNull(data) {
    return new Promise((reslove, reject) => {
        console.log("Promise 2 start");
        console.log(data + " Data");
        let dataInJson = JSON.parse(data);

        console.log(dataInJson.length === 0);

        if (dataInJson.length != 0) {

            console.log("resolve activated");
            reslove(dataInJson);

        }
        else {

            console.log("Rejected");
            reject();
        }
    })
}

function passCorrect(jsonData, password) {
    return new Promise((reslove, reject) => {

        console.log("Promise 3");
        let pass = jsonData[0]["password"];
        if (pass === password) {

            reslove()

        }
        else {

            reject();
        }

    })
}


function dataResolved(res) {
    res.redirect('/');
}

function dataReject(res) {
    /**
     res.render('login', {
        title: 'Login page',
        action: 'doLogin',
        buttonText: 'Login',
        errorMessage: 'Wrong username or password'
    });**/

    console.log("Reject function called");

}

module.exports = doLogin;