$database = new DBFunctions();
//This is the array where the JSON data will be returned
$data = array("mode" => $mode, "success" => 0, "error" => 0);
if ($mode == 'register') {
//Extract all data that we need in order to register a user
$name = $_POST['name'];
$year = $_POST['year'];
$class = $_POST['class'];
if ($database->isUserRegistered($name)) {
$data["success"] = 0;
$data["error"] = 2;
$data["message"] = "This user is already registered!";
echo json_encode($data);
} else {
//We can insert the user in the database
$tmp_user = $database->saveUser($name, $year, $class);
//This means the user was saved in the database with success
if ($tmp_user != false) {
$data["success"] = 1;
$data["error"] = 0;
$data["user"]["name"] = $tmp_user["name"];
$data["user"]["year"] = $tmp_user["year"];
$data["user"]["class"] = $tmp_user["class"];
$data["message"] = "The user was saved in the database!";
echo json_encode($data);
} else {
//Failed to store a user in the database
$data["success"] = 0;
$data["error"] = 1;
$data["message"] = "Something went wrong while registering the user!";
echo json_encode($data);
