/*
Copyright (©) 2003-2025 Teus Benschop.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
document.addEventListener("DOMContentLoaded", function(e) {
  notesPoll ();
  window.addEventListener("unload", notesUnload);
});


function notesPoll ()
{
  const url = "poll?action=alive";
  fetch(url, {
    method: "GET",
    keepalive: true,
  })
  .then((response) => {
    if (!response.ok) {
      throw new Error(response.status);
    }
    return response.text();
  })
  .then((response) => {
    if (response != "") {
      if (response != location.href) {
        location.href = response;
      }
    }
  })
  .catch((error) => {
    console.log(error);
  })
  .finally(() => {
    setTimeout (notesPoll, 1000);
  });
}


function notesUnload ()
{
  const url = "poll?action=unload";
  fetch(url, {
    method: "GET",
    keepalive: true,
  })
  .then((response) => {
    if (!response.ok) {
      throw new Error(response.status);
    }
    return response.text();
  })
  .then((response) => {
  })
  .catch((error) => {
    console.log(error);
  })
}
