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/* Add an expand/collapse all button to the top of the Vector 2022 table of contents See also https://phabricator.wikimedia.org/T302426

To install add this line: importScript('User:The wub/tocExpandAllSandbox.js');

to https://en.wikipedia.org/wiki/Special:MyPage/vector-2022.js

• /

$( document ).ready(function () {

   if ( 
       mw.config.get('skin') === 'vector-2022' &&
       document.querySelector('.vector-toc-level-1 ul li') // any subsections?
   ) {
       const expandButton = document.createElement('button');
       expandButton.innerText = 'expand all';
       expandButton.classList.add('vector-pinnable-header-toggle-button', 'vector-toc-expand-all');
       expandButton.addEventListener( 'click', e => {
           document.querySelectorAll('.vector-toc-contents .vector-toc-level-1').forEach( 
               node => node.classList.add('vector-toc-list-item-expanded')
           );
           document.querySelectorAll('.vector-toc-contents [aria-expanded="false"]').forEach(
               node => node.setAttribute('aria-expanded', 'true')
           );
           expandButton.style.display = 'none';
           collapseButton.style.display = 'inline-block';
           collapseButton.focus({ preventScroll: true });
       });
       
       const collapseButton = document.createElement('button');
       collapseButton.innerText = 'collapse all';
       collapseButton.classList.add('vector-pinnable-header-toggle-button', 'vector-toc-collapse-all');
       collapseButton.addEventListener( 'click', e => {
           document.querySelectorAll('.vector-toc-contents .vector-toc-level-1').forEach(
               node => node.classList.remove('vector-toc-list-item-expanded')
           );
           document.querySelectorAll('.vector-toc-contents [aria-expanded="true"]').forEach(
               node => node.setAttribute('aria-expanded', 'false')
           );
           collapseButton.style.display = 'none';
           expandButton.style.display = 'inline-block';
           expandButton.focus({ preventScroll: true });
       });

       // Any already expanded sections?
       if ( document.querySelector('.vector-toc-list-item-expanded ul li') ) {
           expandButton.style.display = 'none';
           collapseButton.style.display = 'inline-block';
       } else {
           expandButton.style.display = 'inline-block';
           collapseButton.style.display = 'none';
       }

       const tocHeader = document.querySelector('.vector-toc-pinnable-header');
       tocHeader.appendChild( expandButton );
       tocHeader.appendChild( collapseButton );

   }

});