<?php
    //$connection = mysqli_connect("localhost", "root", "", "achievements");
    include('../elements/connection.php');
    $username = htmlspecialchars($_POST['username']);
    $password = htmlspecialchars($_POST['password']);

if ($password == "") {
    echo "Lozinka ne sme da bude prazno polje.";
    } else {
        if ($username == "") {
            echo "Korisnicko ime ne sme da bude prazno polje.";
        } else {
            if(ctype_alpha($username) == False){
            echo "Korisnicko ime sme da sadrzi samo engleske karaktere od a do Z.";
        }else{

            if (strpos($username, " ") !== False) {
                echo "Ne mozes koristiti razmak u korisnickom imenu.";
                header("Refresh:3; ../index.php");
            } else {
                $check = mysqli_fetch_array(mysqli_query($connection, "SELECT username FROM users WHERE username='$username'"));
                if ($check > 0) {
                    echo "Taj username se vec koristi, probaj neki drugi";
                    header("Refresh:3; url=../index.php");
                } else {
                    if ($_POST['password'] === $_POST['passwordCheck']) {

                        if (strpos($password, " ") !== False) {
                            echo "Ne mozes koristiti razmak u lozinci.";
                            header("Refresh:3; url=../index.php");
                        } else {
                            $passwordHashed = password_hash($password, PASSWORD_DEFAULT);

                            $query = mysqli_query($connection, "INSERT INTO users (username, password) VALUES ('$username', '$passwordHashed')");

                            echo "Tvoj nalog je uspesno napravljen";
                            header("Refresh:3; url=../index.php");
                        }
                    } else {
                        echo "Password ti se ne podudara, probaj ponovo";
                        header("Refresh:3; url=../index.php");
                    }
                }

            }
        }
    }

?>