<?php
require_once('Connections/bkngstm.php');

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die(json_encode(['success' => false, 'error' => 'Connessione fallita: ' . $conn->connect_error]));
}

if (isset($_POST['userid']) && isset($_POST['lessonnotification'])) {
    $userid = $_POST['userid'];
    $lessonnotification = $_POST['lessonnotification'];

    // Validate lessonnotification value
    if (!in_array($lessonnotification, ['Y', 'N'])) {
        echo json_encode(['success' => false, 'error' => 'Valore lessonnotification non valido']);
        exit;
    }

    $query = "UPDATE auth_users SET lessonnotification = ? WHERE id = ?";
    $stmt = $conn->prepare($query);
    $stmt->bind_param("si", $lessonnotification, $userid);

    if ($stmt->execute()) {
        echo json_encode(['success' => true]);
    } else {
        echo json_encode(['success' => false, 'error' => $conn->error]);
    }

    $stmt->close();
} else {
    echo json_encode(['success' => false, 'error' => 'Parametri mancanti']);
}

$conn->close();