import { getDeviceState } from '../../core';

// Toggle Table of Contents on click. Here, class "hide" open the toc
function toggleTOC() {
  let toc = document.getElementById("toc-section");
  if (toc == null) {
    return
  }

  if (toc.classList.contains("hide")) {
    toc.classList.remove("hide");
  } else {
    // if sidebar-section is open, then close it first
    let sidebar = document.getElementById("sidebar-section");
    if (sidebar != null && sidebar.classList.contains("hide")) {
      sidebar.classList.remove("hide");
    }
    // add "hide" class
    toc.classList.add("hide");
    // if it is mobile device. then scroll to top.
    const { isMobile } = getDeviceState();
    if (isMobile && toc.classList.contains("hide")) {
      document.body.scrollTop = 0;
      document.documentElement.scrollTop = 0;
    }
  }
  if (document.getElementById("hero-area") != null) {
    document.getElementById("hero-area").classList.toggle("hide");
  }
}

window.addEventListener('DOMContentLoaded', () => {
  // bind click event to #toc-toggle in navbar-2.html
  const $toggle = document.getElementById('toc-toggler');
  if ($toggle) $toggle.addEventListener('click', toggleTOC);

  // hide TOC when user clicks on a TOC link. 
  // Only applies if it's mobile.
  const $toc = document.getElementById("TableOfContents");
  if ($toc) {
    $toc.addEventListener('click', (event) => {
      const { isMobile } = getDeviceState();
      if (isMobile && event.target.nodeName === 'A') {
        toggleTOC();
      }
    });
  }
});