// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/publicdomain/zero/1.0/

window.addEventListener("load", doStartup, false);

function doStartup(event) {
  document.fullscreenElement =
    document.fullscreenElement ||
    document.mozFullscreenElement ||
    document.msFullscreenElement ||
    document.webkitFullscreenDocument;
  document.exitFullscreen =
    document.exitFullscreen ||
    document.mozExitFullscreen ||
    document.msExitFullscreen ||
    document.webkitExitFullscreen;

  document.addEventListener("keypress", handleKeypress, false);
}

function handleKeypress(event) {
  if (event.keyCode === 13) {
    toggleFullscreen();
  }
}

function toggleFullscreen() {
  let elem = document.querySelector("video");

  elem.requestFullscreen =
    elem.requestFullscreen ||
    elem.mozRequestFullscreen ||
    elem.msRequestFullscreen ||
    elem.webkitRequestFullscreen;

  if (!document.fullscreenElement) {
    elem
      .requestFullscreen()
      .then(() => {})
      .catch((err) => {
        alert(
          `Error attempting to enable full-screen mode: ${err.message} (${err.name})`,
        );
      });
  } else {
    if (document.exitFullscreen) {
      document.exitFullscreen();
    }
  }
}