#include "mainwindow.h" // Notepad class header file that was generated by the wizard
#include "ui_mainwindow.h"// UI header file that was generated by the uic tool
#include "login.h"
#include <QFileDialog>
#include <QMessageBox>
#include <iostream>
#include <QJsonObject>
#include <QJsonDocument>
#include <QTextStream>

MainWindow::MainWindow(QWidget *parent) // class definition, constructor
    : QMainWindow(parent) // calls qmainwindow parent constructor we have,
    // base class for the MainWindow class:
    , ui(new Ui::MainWindow) // create ui class and assign to ui member
    // creates the UI class instance and assigns it to the ui member:
{
    ui->setupUi(this); // setup user interface
}

MainWindow::~MainWindow()
{
    delete ui; // in the destructor, we delete the ui
}

QJsonObject MainWindow::readUserJsonFile()
{
    QFile file("user.json");
    file.open( QIODevice::ReadOnly);
    QByteArray bytes = file.readAll();
    file.close();
    QJsonDocument document = QJsonDocument::fromJson( bytes );
    return document.object();
}

void MainWindow::saveJsonFile(QJsonObject &users) const
{
    qDebug() << QFile::exists(QStringLiteral(":/user.json"));
    qDebug() << QFile::exists(QStringLiteral("./user.json"));
    qDebug() << QFile::exists(QStringLiteral("user.json"));
    QFile jsonFile(QStringLiteral("user.json"));
    QJsonDocument document;
    document.setObject( users );
    QByteArray bytes = document.toJson( QJsonDocument::Indented );
    jsonFile.open( QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate );
    QTextStream iStream( &jsonFile );
    // iStream.setCodec( "utf-8" );
    iStream << bytes;
    jsonFile.close();
}

// You cannot create a user without an id
void MainWindow::thisIdIsEmpty() const
{
    QMessageBox idEmpty;
    idEmpty.setText("THIS ID IS EMPTY!");
    idEmpty.exec();
}

// You cannot create a user with id similar to an existing one
void MainWindow::thisIdIsTaken() const
{
    QMessageBox idTaken;
    idTaken.setText("THIS ID IS ALREADY TAKEN!");
    idTaken.exec();
}

void MainWindow::saveRegisteredUser(QJsonObject &users) const
{
    QString id = ui->inputId->text();
    if(id == "")
    {
        thisIdIsEmpty();
        return;
    }
    if(users.find(id) == users.end())
    {
        QString mail = ui->inputMail->text();
        QString password = ui->inputPassword->text();
        qDebug() << mail << " " << password;
        QJsonObject user;
        user["userId"] = id;
        user["email"] = mail;
        user["password"]=password;
        /*
        userId - unique user id - text obtained from the user during user registration
        email - e-mail address of the user
        password - password provided by the user
        */
        users.insert(id, user);
        saveJsonFile(users);
    }else thisIdIsTaken();
}


void MainWindow::on_pushButton_clicked()
{
    QJsonObject users = readUserJsonFile();
    saveRegisteredUser(users);
}


void MainWindow::goToLogin()
{
    login *l = new login();
    l -> show();
    hide();
}

void MainWindow::on_loginButton_clicked()
{
    goToLogin();
}