// ==UserScript==
// @name         网页文本转链接(Shadow DOM&动态)
// @description  网页中文本转为可点击链接 添加颜色下划线
// @version      1.0
// @author       WJ
// @match        *://*/*
// @exclude     https://*.bing.com/*
// @exclude     https://*.baidu.com/*
// @license      MIT
// @grant        none
// @run-at       document-idle
// @namespace https://greasyfork.org/users/914996
// @downloadURL none
// ==/UserScript==

(() => {
  /* 1. 样式 */
  const style = document.createElement('style');
  style.textContent = '.url-link{color:#348A87;text-decoration:underline}';
  document.head.appendChild(style);

  /* 2. 正则（与原脚本一致，仅编译一次） */
  const tlds = [
    'app','aero','aer','art','asia','beer','biz','cat','cc','chat','ci','cloud',
    'club','cn','com','cool','coop','co','dev','edu','email','fit','fun','gov',
    'group','hk','host','icu','info','ink','int','io','jobs','kim','love','ltd',
    'luxe','me','mil','mobi','moe','museum','name','net','nl','network','one',
    'online','org','plus','post','press','pro','red','ren','run','ru','shop',
    'site','si','space','store','tech','tel','top','travel','tv','tw','uk','us',
    'video','vip','wang','website','wiki','wml','work','ws','xin','xyz','yoga','zone'
  ].join('|');

  const urlRegex = new RegExp(
    String.raw`\b[\w.:/?=%&#-]{3,}\.(?:${tlds})(?!\w)[\w.:/?=%&#-]*|` +
    String.raw`(?:(?:https?:\/\/)|(?:www\.|wap\.))[\w.:/?=%&#-@+~=]{3,250}\.[\w]{2,6}\b[\w.:/?=%&#-@+~=]*`,
    'gi'
  );
  /* 3. 跳过标签与输入区域 */
  const skipTags = new Set(['A','SCRIPT','STYLE','TEXTAREA','BUTTON','SELECT','OPTION','CODE','PRE','INPUT']);

  const shouldSkip = el =>
    !el ||
    skipTags.has(el.tagName) ||
    el.isContentEditable ||
    el.closest('[contenteditable="true"], input, textarea, select');

  /* 4. 处理节点（打标记防重复） */
  const PROCESSED = '_urlLinked';
  function processNode(root) {
    if (root[PROCESSED] || shouldSkip(root)) return;
    root[PROCESSED] = true;

    const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, null);
    const textNodes = [];
    let n;
    while (n = walker.nextNode()) {
      if (!shouldSkip(n.parentElement)) textNodes.push(n);
    }
    textNodes.forEach(tn => {
      const txt = tn.textContent;
      urlRegex.lastIndex = 0;
      if (!urlRegex.test(txt)) return;
      urlRegex.lastIndex = 0;
      const replaced = txt.replace(urlRegex, m =>
        `<a class="url-link" target="_blank" href="${/^\w+:\/\//.test(m) ? m : 'https://' + m}">${m}</a>`);
      if (replaced !== txt) {
        const span = document.createElement('span');
        span.innerHTML = replaced;
        tn.replaceWith(span);
      }
    });
  }
  /* 5. 仅扫描可见区域（IntersectionObserver + 空闲回调） */
  function processVisible() {
    const io = new IntersectionObserver(entries => {
      entries.forEach(e => {
        if (e.isIntersecting) {
          io.unobserve(e.target);
          requestIdleCallback(() => processNode(e.target), { timeout: 1000 });
        }
      });
    });
    document.querySelectorAll('body *').forEach(el => io.observe(el));
  }
  /* 6. 节流 MutationObserver */
  let moPending = false;
  function onMutation() {
    if (moPending) return;
    moPending = true;
    requestIdleCallback(() => {
      document.querySelectorAll(`body *:not([${PROCESSED}])`).forEach(processNode);
      moPending = false;
    }, { timeout: 1000 });
  }
  /* 7. 初始化 */
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', processVisible);
  } else {
    processVisible();
  }
  new MutationObserver(onMutation).observe(document.body, { childList: true, subtree: true });
})();