// ==UserScript==
// @name         Reddit Lite去ad
// @namespace    https://reddit.com/
// @version      4.0
// @description  去AD，极简，不影响页面加载
// @author       Glyn 极简优化
// @match        https://www.reddit.com/*
// @grant        none
// @license      MIT
// @run-at       document-start
// ==/UserScript==
(function() {
  'use strict';

  const AD_SEL = `
    shreddit-comments-page-ad, shreddit-ad-post, div[data-testid="adpost"],
    div[data-testid*="promoted"], div[data-adclicklocation], div[id^="ad_"],
    faceplate-tracker[thing-type="ad_post"],
    shreddit-async-loader[bundlename*="ad"]:not([bundlename*="comment"]):not([bundlename*="reply"]):not([bundlename*="body_header"])
  `;
  let timer, observer;

  document.documentElement.appendChild(document.createElement('style')).textContent = `${AD_SEL}{display:none!important}`;

  const cleanAds = (mutations) => {
    (window.requestIdleCallback || setTimeout)(() => {
      document.querySelectorAll(AD_SEL).forEach(el => el.remove());
      mutations?.forEach(m => m.addedNodes.forEach(n => {
        if (n.nodeType !== 1) return;
        n.querySelectorAll('span,a').forEach(el => {
          el.textContent.trim().toLowerCase() === 'promoted' && el.closest('shreddit-post, div[data-testid="post-container"]')?.remove();
        });
      }));
    }, { timeout: 200 });
  };

  // 3. 优化监听：防抖+仅监听必要变化，无高频触发
  const initObserver = () => observer = new MutationObserver((m) => {
    clearTimeout(timer);
    timer = setTimeout(() => cleanAds(m), 80);
  }).observe(document.body, { childList: true, subtree: true });

  // 4. 生命周期优化：不抢占首屏加载，后台自动降载
  document.addEventListener('DOMContentLoaded', () => { cleanAds(); initObserver(); });
  document.addEventListener('visibilitychange', () => document.hidden ? observer?.disconnect() : initObserver());
})();