// ==UserScript==
// @name         Email Copy Button for All Sites
// @name:zh-CN   全站邮箱一键复制
// @namespace    http://tampermonkey.net/
// @version      1.7
// @description  Automatically detects email addresses on any webpage and adds a one-click copy button. Supports plain text emails and mailto links, including React/Next.js dynamically rendered pages and AI chat interfaces (e.g. Gumloop).
// @description:zh-CN 在任意网页自动识别邮箱地址并添加一键复制按钮，支持纯文本邮箱和 mailto 链接，兼容 React/Next.js 动态渲染页面及 AI 聊天界面（如 Gumloop）。
// @author       Nosy Swab
// @match        *://*/*
// @exclude      https://apps.sfc.hk/*
// @run-at       document-end
// @grant        none
// @license      MIT
// @icon         data:image/svg+xml;base64,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
// @downloadURL https://update.greasyfork.icu/scripts/569979/Email%20Copy%20Button%20for%20All%20Sites.user.js
// @updateURL https://update.greasyfork.icu/scripts/569979/Email%20Copy%20Button%20for%20All%20Sites.meta.js
// ==/UserScript==

(function () {
  'use strict';

  if (location.hostname === 'apps.sfc.hk') return;

  var EMAIL_RE = /[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}/;
  var EMAIL_RE_G = /[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}/g;

  // v1.7: Removed CODE and PRE from skip list to support AI chat output (e.g. Gumloop)
  var SKIP_TAGS = new Set([
    'SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT',
    'HEAD', 'IFRAME', 'BUTTON'
  ]);

  var pending = [];
  var scheduled = false;
  var MAX_WALK_PER_CALL = 2000;
  var MAX_PROCESS_PER_BATCH = 50;

  function makeBtn(email) {
    var btn = document.createElement('button');
    btn.textContent = '\uD83D\uDCCB';
    btn.title = email;
    btn.setAttribute('data-copy-btn', '1');
    btn.style.cssText =
      'display:inline-block;margin-left:5px;padding:0 5px;' +
      'background:#00695c;color:#fff;border:none;border-radius:3px;' +
      'cursor:pointer;font-size:11px;height:17px;line-height:17px;' +
      'vertical-align:middle;font-family:sans-serif';

    btn.addEventListener('click', function (e) {
      e.stopPropagation();
      e.preventDefault();

      function showSuccess() {
        btn.textContent = '\u2705';
        setTimeout(function () { btn.textContent = '\uD83D\uDCCB'; }, 2000);
      }

      if (!navigator.clipboard || !navigator.clipboard.writeText) {
        var tmp = document.createElement('textarea');
        tmp.value = email;
        tmp.style.cssText = 'position:fixed;top:0;left:-9999px;opacity:0';
        document.body.appendChild(tmp);
        tmp.select();
        try { document.execCommand('copy'); } catch (err) {}
        document.body.removeChild(tmp);
        showSuccess();
        return;
      }

      navigator.clipboard.writeText(email).then(showSuccess).catch(function () {
        var tmp = document.createElement('textarea');
        tmp.value = email;
        tmp.style.cssText = 'position:fixed;top:0;left:-9999px;opacity:0';
        document.body.appendChild(tmp);
        tmp.select();
        try { document.execCommand('copy'); } catch (err) {}
        document.body.removeChild(tmp);
        showSuccess();
      });
    });

    return btn;
  }

  function isInDocument(node) {
    try {
      return document.contains ? document.contains(node) : document.body.contains(node);
    } catch (e) {
      return false;
    }
  }

  function processMailtoLink(a) {
    if (!a || !a.parentNode) return;
    if (!isInDocument(a)) return;
    if (a.hasAttribute('data-email-tagged')) return;

    var href = a.getAttribute('href') || '';
    if (href.toLowerCase().indexOf('mailto:') !== 0) return;

    var email = href.replace(/^mailto:/i, '').split('?')[0].trim();
    if (!email) email = (a.textContent || '').trim();
    if (!email || !EMAIL_RE.test(email)) return;

    var next = a.nextSibling;
    while (next && next.nodeType === Node.TEXT_NODE && next.textContent.trim() === '') {
      next = next.nextSibling;
    }
    if (next && next.nodeType === Node.ELEMENT_NODE &&
      next.getAttribute && next.getAttribute('data-copy-btn')) return;

    a.setAttribute('data-email-tagged', '1');
    try {
      a.parentNode.insertBefore(makeBtn(email), a.nextSibling);
    } catch (e) {}
  }

  function processTextNode(node) {
    if (!node || !node.parentNode) return;
    if (!isInDocument(node)) return;

    var text = node.textContent;
    if (!text || text.indexOf('@') === -1) return;

    var parent = node.parentNode;
    if (SKIP_TAGS.has(parent.nodeName)) return;
    if (parent.nodeName === 'A') return;
    if (parent.hasAttribute &&
      (parent.hasAttribute('data-email-tagged') ||
        parent.hasAttribute('data-copy-btn'))) return;

    EMAIL_RE_G.lastIndex = 0;
    var matches = [];
    var m;
    while ((m = EMAIL_RE_G.exec(text)) !== null) {
      matches.push({ email: m[0], index: m.index, length: m[0].length });
    }
    if (!matches.length) return;

    var frag = document.createDocumentFragment();
    var last = 0;
    for (var i = 0; i < matches.length; i++) {
      var match = matches[i];
      if (match.index > last) {
        frag.appendChild(document.createTextNode(text.slice(last, match.index)));
      }
      var span = document.createElement('span');
      span.textContent = match.email;
      span.setAttribute('data-email-tagged', '1');
      frag.appendChild(span);
      frag.appendChild(makeBtn(match.email));
      last = match.index + match.length;
    }
    if (last < text.length) {
      frag.appendChild(document.createTextNode(text.slice(last)));
    }

    try {
      parent.replaceChild(frag, node);
    } catch (e) {}
  }

  function queueFromRoot(root) {
    if (!root) return;

    if (root.nodeType === Node.ELEMENT_NODE) {
      try {
        var style = window.getComputedStyle(root);
        if (style && (style.display === 'none' || style.visibility === 'hidden')) return;
      } catch (e) {
        return;
      }

      try {
        var allLinks = (root.nodeName === 'A')
          ? [root]
          : root.querySelectorAll('a[href]');
        for (var i = 0; i < allLinks.length; i++) {
          var h = allLinks[i].getAttribute('href') || '';
          if (h.toLowerCase().indexOf('mailto:') === 0) {
            pending.push({ type: 'mailto', el: allLinks[i] });
          }
        }
      } catch (e) {}
    }

    try {
      var walker = document.createTreeWalker(
        root,
        NodeFilter.SHOW_TEXT,
        {
          acceptNode: function (node) {
            var p = node.parentNode;
            if (!p) return NodeFilter.FILTER_REJECT;
            if (SKIP_TAGS.has(p.nodeName)) return NodeFilter.FILTER_REJECT;
            if (p.nodeName === 'A') return NodeFilter.FILTER_REJECT;
            if (p.hasAttribute &&
              (p.hasAttribute('data-email-tagged') ||
                p.hasAttribute('data-copy-btn'))) return NodeFilter.FILTER_REJECT;
            if (!node.textContent || node.textContent.indexOf('@') === -1)
              return NodeFilter.FILTER_REJECT;
            return NodeFilter.FILTER_ACCEPT;
          }
        }
      );

      var n;
      var limit = MAX_WALK_PER_CALL;
      while ((n = walker.nextNode()) && limit-- > 0) {
        pending.push({ type: 'text', el: n });
      }
    } catch (e) {}

    if (pending.length) schedule();
  }

  function flush(deadline) {
    scheduled = false;
    var count = 0;
    while (pending.length > 0 && count < MAX_PROCESS_PER_BATCH) {
      if (deadline && typeof deadline.timeRemaining === 'function' && deadline.timeRemaining() < 2) {
        schedule();
        return;
      }
      var item = pending.shift();
      if (item.type === 'mailto') {
        processMailtoLink(item.el);
      } else {
        processTextNode(item.el);
      }
      count++;
    }
    if (pending.length) schedule();
  }

  function schedule() {
    if (scheduled) return;
    scheduled = true;
    if ('requestIdleCallback' in window) {
      window.requestIdleCallback(flush, { timeout: 1500 });
    } else {
      setTimeout(function () { flush({}); }, 100);
    }
  }

  queueFromRoot(document.body);

  // v1.7: Extended retry delays to cover AI streaming output (up to 15s)
  [500, 1000, 2000, 3000, 5000, 8000, 12000, 15000].forEach(function (delay) {
    setTimeout(function () { queueFromRoot(document.body); }, delay);
  });

  var obs = new MutationObserver(function (mutations) {
    for (var i = 0; i < mutations.length; i++) {
      var m = mutations[i];
      // v1.7: Also handle characterData mutations for streaming text output
      if (m.type === 'characterData') {
        var tn = m.target;
        if (tn && tn.textContent && tn.textContent.indexOf('@') !== -1) {
          pending.push({ type: 'text', el: tn });
        }
      }
      for (var j = 0; j < m.addedNodes.length; j++) {
        var n = m.addedNodes[j];
        if (n.nodeType === Node.TEXT_NODE) {
          if (n.textContent && n.textContent.indexOf('@') !== -1) {
            pending.push({ type: 'text', el: n });
          }
        } else if (n.nodeType === Node.ELEMENT_NODE) {
          queueFromRoot(n);
        }
      }
    }
    if (pending.length) schedule();
  });

  try {
    // v1.7: Added characterData:true to capture streaming text mutations
    obs.observe(document.body, { childList: true, subtree: true, characterData: true });
  } catch (e) {}
})();