// ==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     3.0.0
// @grant       none
// @downloadURL https://update.greasyfork.icu/scripts/31255/Google%20Tools%20Button%20Clicker.user.js
// @updateURL https://update.greasyfork.icu/scripts/31255/Google%20Tools%20Button%20Clicker.meta.js
// ==/UserScript==

(function(){
  const SCRIPTID = 'GoogleToolsButtonClicker';
  const SCRIPTNAME = 'Google Tools Button Clicker';
  const DEBUG = false;/*
[update] 3.0.0
Fix for google's update. It no longer auto-clicks on mouseovers. Internal changes.

[bug]

[todo]

[possible]

[research]

[memo]
  */
  if(window === top && console.time) console.time(SCRIPTID);
  const MS = 1, SECOND = 1000*MS, MINUTE = 60*SECOND, HOUR = 60*MINUTE, DAY = 24*HOUR, WEEK = 7*DAY, MONTH = 30*DAY, YEAR = 365*DAY;
  const site = {
    targets: {
      tools: () => document.querySelector('#hdtb-tls'),
    },
  };
  let elements = {}, flags = {}, timers = {};
  const core = {
    initialize: function(){
      elements.html = document.documentElement;
      elements.html.classList.add(SCRIPTID);
      core.ready();
    },
    ready: function(){
      core.getTargets(site.targets).then(() => {
        log("I'm ready.");
        core.click();
      }).catch(e => {
        console.error(`${SCRIPTID}:`, e);
      });
    },
    click: function(){
      timers.expand = setInterval(() => {
        const tools = elements.tools, click = tools.click.bind(tools);
        const activeElement = document.activeElement;
        /* already opened? */
        if(tools.getAttribute('aria-expanded') === 'true') return clearInterval(timers.expand);
        /* now being closed, so */
        tools.click(), activeElement.focus();
      }, 250);
    },
    getTarget: function(selector, retry = 10, interval = 1*SECOND){
      const key = selector.name;
      const get = function(resolve, reject){
        let selected = selector();
        if(selected === null || selected.length === 0){
          if(--retry) return log(`Not found: ${key}, retrying... (${retry})`), setTimeout(get, interval, resolve, reject);
          else return reject(new Error(`Not found: ${selector.name}, I give up.`));
        }else{
          if(selected.nodeType === Node.ELEMENT_NODE) selected.dataset.selector = key;/* element */
          else selected.forEach((s) => s.dataset.selector = key);/* elements */
          elements[key] = selected;
          resolve(selected);
        }
      };
      return new Promise(function(resolve, reject){
        get(resolve, reject);
      });
    },
    getTargets: function(selectors, retry = 10, interval = 1*SECOND){
      return Promise.all(Object.values(selectors).map(selector => core.getTarget(selector, retry, interval)));
    },
    addStyle: function(name = 'style', d = document){
      if(html[name] === undefined) return;
      if(d.head){
        let style = createElement(html[name]()), id = SCRIPTID + '-' + name, old = d.getElementById(id);
        style.id = id;
        d.head.appendChild(style);
        if(old) old.remove();
      }
      else{
        let observer = observe(d.documentElement, function(){
          if(!d.head) return;
          observer.disconnect();
          core.addStyle(name);
        });
      }
    },
  };
  const html = {
    style: () => `
      <style type="text/css">
      </style>
    `,
  };
  const setTimeout = window.setTimeout.bind(window), clearTimeout = window.clearTimeout.bind(window), setInterval = window.setInterval.bind(window), clearInterval = window.clearInterval.bind(window), requestAnimationFrame = window.requestAnimationFrame.bind(window), requestIdleCallback = window.requestIdleCallback.bind(window);
  const alert = window.alert.bind(window), confirm = window.confirm.bind(window), prompt = window.prompt.bind(window), getComputedStyle = window.getComputedStyle.bind(window), fetch = window.fetch.bind(window);
  if(!('isConnected' in Node.prototype)) Object.defineProperty(Node.prototype, 'isConnected', {get: function(){return document.contains(this)}});
  const $ = function(s, f = undefined){
    let target = document.querySelector(s);
    if(target === null) return null;
    return f ? f(target) : target;
  };
  const $$ = function(s, f = undefined){
    let targets = document.querySelectorAll(s);
    return f ? f(targets) : targets;
  };
  const createElement = function(html = '<div></div>'){
    let outer = document.createElement('div');
    outer.insertAdjacentHTML('afterbegin', html);
    return outer.firstElementChild;
  };
  const observe = function(element, callback, options = {childList: true, subtree: false, characterData: false, attributes: false, attributeFilter: undefined}){
    let observer = new MutationObserver(callback.bind(element));
    observer.observe(element, options);
    return observer;
  };
  const match = function(string, regexp, f, g = undefined){
    let m = string.match(regexp);
    if(m !== null) return f(m);
    else return g ? g() : null;
  };
  const log = function(){
    if(typeof DEBUG === 'undefined') return;
    let l = log.last = log.now || new Date(), n = log.now = new Date();
    let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
    //console.log(error.stack);
    console.log(
      SCRIPTID + ':',
      /* 00:00:00.000  */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
      /* +0.000s       */ '+' + ((n-l)/1000).toFixed(3) + 's',
      /* :00           */ ':' + line,
      /* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
      /* caller        */ (callers[1] || '') + '()',
      ...arguments
    );
  };
  log.formats = [{
      name: 'Firefox Scratchpad',
      detector: /MARKER@Scratchpad/,
      getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
      getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
    }, {
      name: 'Firefox Console',
      detector: /MARKER@debugger/,
      getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
      getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
    }, {
      name: 'Firefox Greasemonkey 3',
      detector: /\/gm_scripts\//,
      getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
      getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
    }, {
      name: 'Firefox Greasemonkey 4+',
      detector: /MARKER@user-script:/,
      getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
      getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
    }, {
      name: 'Firefox Tampermonkey',
      detector: /MARKER@moz-extension:/,
      getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 2,
      getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
    }, {
      name: 'Chrome Console',
      detector: /at MARKER \(<anonymous>/,
      getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
      getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
    }, {
      name: 'Chrome Tampermonkey',
      detector: /at MARKER \(chrome-extension:.*?\/userscript.html\?name=/,
      getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1] - 1,
      getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
    }, {
      name: 'Chrome Extension',
      detector: /at MARKER \(chrome-extension:/,
      getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
      getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
    }, {
      name: 'Edge Console',
      detector: /at MARKER \(eval/,
      getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
      getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
    }, {
      name: 'Edge Tampermonkey',
      detector: /at MARKER \(Function/,
      getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
      getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
    }, {
      name: 'Safari',
      detector: /^MARKER$/m,
      getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
      getCallers: (e) => e.stack.split('\n'),
    }, {
      name: 'Default',
      detector: /./,
      getLine: (e) => 0,
      getCallers: (e) => [],
  }];
  log.format = log.formats.find(function MARKER(f){
    if(!f.detector.test(new Error().stack)) return false;
    //console.log('////', f.name, 'wants', 0/*line*/, '\n' + new Error().stack);
    return true;
  });
  core.initialize();
  if(window === top && console.timeEnd) console.timeEnd(SCRIPTID);
})();