// ==UserScript==
// @name        Google Tools Button Clicker
// @name:ja     Google Tools Button Clicker
// @name:zh-CN  Google Tools Button Clicker
// @description Automatically clicks Tools button on Google search.
// @description:ja Google検索結果のページでツールボタンを自動的にクリックします。
// @description:zh-CN 在Google搜索结果的页面上自动单击工具按钮。
// @namespace   knoa.jp
// @include     https://www.google.*/search*
// @version     2.2.0
// @run-at      document-start
// @grant       none
// @downloadURL none
// ==/UserScript==

/*
[update]
mouseover to show the number of results.
*/
(function(){
  const TARGETS = {
    tools: () => document.querySelector('#hdtb-tls'),
    menus: () => document.querySelector('#hdtbMenus'),
  };
  let openMenus = function(){
    let menus = TARGETS.menus(), tools = TARGETS.tools(), ae = document.activeElement;
    if(menus && menus.getAttribute('aria-expanded') === 'true') return;
    if(tools && tools.classList.contains('hdtb-tl-sel')) return;
    if(tools){
      tools.click(), ae.focus();
      tools.addEventListener('mouseover', tools.click);
      tools.addEventListener('mouseout', tools.click);
      tools.addEventListener('click', function(e){
        if(e.isTrusted === false) return;
        tools.removeEventListener('mouseover', tools.click);
        tools.removeEventListener('mouseout', tools.click);
      });
    }
  };
  if(document.hidden) window.addEventListener('focus', openMenus, {once: true});
  else window.addEventListener('load', setTimeout.bind(null, openMenus, 250));
})();