Saving a reservation button [closed]

I have a problem with saving the data of the person who clicked and the function counting down the reservation time after clicking the button. I am completely stuck, does anyone of you know how I can solve this and where the problem lies, after pressing the button changes to reserved with a countdown time, but after refreshing the page no data is saved. so that if any user enters, they can also click this button, and it should work so that when one person clicks, save who clicked, counts down the reservation time 48h back, thus blocking the possibility of pressing the button for other users and they only see how much time is reserved and after that time the button should return to the possibility of re-booking.

Please help.

AJAX:

function handle_reservation() {
    $user_id = get_current_user_id();
    $post_id = intval($_POST['post_id']);

    if (!$user_id) {
        wp_send_json_error(['message' => 'Musisz być zalogowany, aby rezerwować.']);
    }

    $current_reservation = get_post_meta($post_id, '_reserved_by', true);
    $reserved_until = get_post_meta($post_id, '_reserved_until', true);

    if ($current_reservation && time() < $reserved_until) {
        wp_send_json_error([
            'message' => 'Post już zarezerwowany do ' . date('Y-m-d H:i:s', $reserved_until),
            'reserved_by' => get_userdata($current_reservation)->user_login
        ]);
    }

    update_post_meta($post_id, '_reserved_by', $user_id);
    update_post_meta($post_id, '_reserved_until', time() + 48 * 60 * 60);

    wp_send_json_success([
        'message' => 'Post zarezerwowany.',
        'reserved_by' => get_userdata($user_id)->user_login
    ]);
}
add_action('wp_ajax_reserve_post', 'handle_reservation');

function check_reservation_status() {
    $post_id = intval($_POST['post_id']);
    $reservation = get_post_meta($post_id, '_reserved_by', true);
    $reserved_until = get_post_meta($post_id, '_reserved_until', true);

    if ($reservation && time() < $reserved_until) {
        wp_send_json_success([
            'reserved' => true,
            'reserved_by' => get_userdata($reservation)->user_login,
            'time_left' => $reserved_until - time()
        ]);
    } else {
        wp_send_json_success(['reserved' => false]);
    }
}
add_action('wp_ajax_check_reservation_status', 'check_reservation_status');

function enqueue_reserve_post_script() {
    wp_enqueue_script('reserve-post-js', get_template_directory_uri() . '/js/reserve-post.js', ['jquery'], null, true);
    
    wp_localize_script('reserve-post-js', 'wp_vars', [
        'ajax_url' => admin_url('admin-ajax.php'),
        'user_id' => get_current_user_id()
    ]);
}
add_action('wp_enqueue_scripts', 'enqueue_reserve_post_script');

JS:

document.addEventListener('DOMContentLoaded', function() {
    const buttons = document.querySelectorAll('.reserve-button');

    buttons.forEach(function(button) {
        button.style.backgroundColor = "green";
        button.style.color = "white";
        button.style.border = "none";
        button.style.padding = "10px 20px";
        button.style.fontSize = "16px";
        button.textContent = "Zarezerwuj";

        const postId = button.getAttribute('data-post-id');
        const userId = wp_vars.user_id;
        const reservationInfo = button.nextElementSibling;
        const reservedByElement = reservationInfo.querySelector('.reserved-by');

        checkReservation(postId, button, reservationInfo, reservedByElement);

        button.addEventListener('click', function() {
            reservePost(postId, userId, button, reservationInfo, reservedByElement);
        });

        button.addEventListener('mouseenter', function() {
            if (!button.disabled) {
                button.style.backgroundColor = "white";
                button.style.color = "orange";
                button.style.border = "2px solid orange";
                button.textContent = "ZAREZERWUJ";
            }
        });

        button.addEventListener('mouseleave', function() {
            if (!button.disabled) {
                button.style.backgroundColor = "green";
                button.style.color = "white";
                button.style.border = "none";
                button.textContent = "Zarezerwuj";
            }
        });
    });
});

function checkReservation(postId, button, reservationInfo, reservedByElement) {
    jQuery.ajax({
        url: wp_vars.ajax_url,
        type: 'POST',
        data: {
            action: 'check_reservation_status',
            post_id: postId
        },
        success: function(response) {
            if (response.success && response.data.reserved) {
                const { time_left, reserved_by } = response.data;
                button.textContent = `Zarezerwowane na ${formatTime(time_left)}`;
                button.style.backgroundColor = "orange";
                button.style.color = "white";
                button.disabled = true;
                startCountdown(button, time_left);

                reservedByElement.textContent = reserved_by;
                reservationInfo.style.display = "block";
            }
        },
        error: function() {
            console.error('Błąd podczas sprawdzania rezerwacji.');
        }
    });
}

function reservePost(postId, userId, button, reservationInfo, reservedByElement) {
    jQuery.ajax({
        url: wp_vars.ajax_url,
        type: 'POST',
        data: {
            action: 'reserve_post',
            post_id: postId,
            user_id: userId
        },
        success: function(response) {
            if (response.success) {
                const time_left = 48 * 60 * 60;
                button.textContent = `Zarezerwowane na ${formatTime(time_left)}`;
                button.style.backgroundColor = "orange";
                button.style.color = "white";
                button.disabled = true;
                startCountdown(button, time_left);

                reservedByElement.textContent = response.data.reserved_by;
                reservationInfo.style.display = "block";
            } else {
                alert('Nie udało się zarezerwować: ' + response.data.message);
            }
        },
        error: function() {
            alert('Błąd podczas rezerwacji.');
        }
    });
}

function formatTime(seconds) {
    const hours = Math.floor(seconds / 3600);
    const minutes = Math.floor((seconds % 3600) / 60);
    return `${hours}h ${pad(minutes)}m`;
}

function pad(num) {
    return num < 10 ? '0' + num : num;
}

function startCountdown(button, remainingTime) {
    const countdownInterval = setInterval(() => {
        remainingTime -= 1;
        if (remainingTime <= 0) {
            clearInterval(countdownInterval);
            button.textContent = "Zarezerwuj ponownie";
            button.style.backgroundColor = "green";
            button.style.color = "white";
            button.disabled = false;
        } else {
            button.textContent = `Zarezerwowane na ${formatTime(remainingTime)}`;
        }
    }, 1000);
}