// ==UserScript==
// @name         网页复制解锁
// @namespace    https://cxbank.icu/copyfree
// @version      1.0.0
// @description  解除网页的复制、右键、选中限制。一键开关，不影响页面其他功能。
// @author       ZZ
// @match        *://*/*
// @grant        none
// @run-at       document-start
// @noframes     false
// @license MIT
// ==/UserScript==

(function () {
  'use strict';

  var KEY = 'copyfree_on';
  var S = {
    on: true,
    removedAttrs: 0,
    removedClasses: 0,
  };

  try { S.on = localStorage.getItem(KEY) !== '0'; } catch (e) {}

  /* 需要"放行"的事件类型 */
  var BLOCKED = { copy: 1, cut: 1, contextmenu: 1, selectstart: 1, dragstart: 1 };

  /* ---------- 1) 拦截 preventDefault ---------- */
  var origPD = Event.prototype.preventDefault;
  Event.prototype.preventDefault = function () {
    try {
      if (S.on && this && BLOCKED[this.type]) {
        /* 记录一下，面板上能看到"本站拦了几个" */
        S.blockedCalls = (S.blockedCalls || 0) + 1;
        return;
      }
    } catch (e) {}
    return origPD.apply(this, arguments);
  };

  /* ---------- 2) 清掉内联事件 ---------- */
  function stripInline(root) {
    try {
      var attrs = ['oncopy', 'oncut', 'oncontextmenu', 'onselectstart', 'ondragstart', 'onmousedown', 'onmouseup'];
      var all = (root || document).querySelectorAll('*');
      for (var i = 0; i < all.length; i++) {
        var el = all[i];
        for (var k = 0; k < attrs.length; k++) {
          if (el.getAttribute && el.getAttribute(attrs[k])) {
            el.removeAttribute(attrs[k]);
            S.removedAttrs++;
          }
        }
      }
      /* 文档级 */
      ['oncopy', 'oncut', 'oncontextmenu', 'onselectstart', 'ondragstart'].forEach(function (a) {
        try { document[a] = null; } catch (e) {}
        try { document.body && (document.body[a] = null); } catch (e) {}
      });
    } catch (e) {}
  }

  /* ---------- 3) 去掉 user-select: none ---------- */
  var style = null;
  function applyStyle() {
    if (!style) {
      style = document.createElement('style');
      style.id = 'copyfree-style';
      style.textContent =
        'html,body,*{-webkit-user-select:text !important;user-select:text !important;' +
        '-webkit-touch-callout:default !important}';
      (document.head || document.documentElement).appendChild(style);
    }
    style.disabled = !S.on;
  }

  /* ---------- 4) 清理常见"禁止选中"的 class ---------- */
  var BAD_CLASS = /(noselect|no-select|noselection|unselectable|disable-select|user-select-none)/i;
  function stripClasses(root) {
    try {
      var all = (root || document).querySelectorAll('[class]');
      for (var i = 0; i < all.length; i++) {
        var el = all[i];
        var c = String(el.className || '');
        if (!BAD_CLASS.test(c)) continue;
        el.className = c.split(/\s+/).filter(function (x) { return !BAD_CLASS.test(x); }).join(' ');
        S.removedClasses++;
      }
    } catch (e) {}
  }

  /* ---------- 5) 兜底：Alt+C 强制复制选中内容 ---------- */
  function forceCopy() {
    try {
      var sel = String(window.getSelection ? window.getSelection() : '');
      if (!sel) return false;
      if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(sel);
        return true;
      }
      var ta = document.createElement('textarea');
      ta.value = sel;
      ta.style.cssText = 'position:fixed;left:-9999px;top:0';
      document.body.appendChild(ta);
      ta.select();
      document.execCommand('copy');
      ta.remove();
      return true;
    } catch (e) { return false; }
  }

  document.addEventListener('keydown', function (e) {
    if (e.altKey && (e.key === 'c' || e.key === 'C')) {
      if (forceCopy()) {
        e.preventDefault();
        toast('已复制选中内容');
      }
    }
  }, true);

  /* ---------- 面板 ---------- */
  var host = null, root = null, dot = null, tip = null;

  var CSS = [
    '.dot{position:fixed;right:14px;bottom:56px;width:38px;height:38px;border-radius:50%;',
    'background:linear-gradient(145deg,#34c759,#28a745);color:#fff;border:none;cursor:pointer;',
    'font:600 13px/1 -apple-system,"Segoe UI",sans-serif;z-index:2147483000;',
    'box-shadow:0 8px 20px rgba(52,199,89,.4);display:flex;align-items:center;justify-content:center}',
    '.dot.off{background:linear-gradient(145deg,#8e8e93,#6c6c70);box-shadow:0 8px 20px rgba(0,0,0,.2)}',
    '.card{position:fixed;right:14px;bottom:102px;width:236px;z-index:2147483001;',
    'background:rgba(255,255,255,.97);border:.5px solid rgba(0,0,0,.1);border-radius:14px;',
    'padding:12px 14px;font:13px/1.7 -apple-system,"Segoe UI",sans-serif;color:#1c1c1e;',
    'box-shadow:0 12px 34px rgba(0,0,0,.22);display:none}',
    '.card h4{margin:0 0 8px;font-size:13px}',
    '.row{display:flex;justify-content:space-between;color:#8e8e93;font-size:11.5px;margin-bottom:6px}',
    '.row b{color:#1c1c1e}',
    '.sw{display:flex;align-items:center;justify-content:space-between;margin:10px 0 4px;font-size:12.5px}',
    '.tg{width:44px;height:24px;border-radius:99px;background:#e5e5ea;position:relative;cursor:pointer;transition:.2s}',
    '.tg.on{background:#34c759}',
    '.tg i{position:absolute;left:2px;top:2px;width:20px;height:20px;border-radius:50%;background:#fff;transition:.2s}',
    '.tg.on i{left:22px}',
    '.hint{color:#8e8e93;font-size:11px;margin-top:8px;line-height:1.6}',
  ].join('');

  function toast(t) {
    if (tip) { tip.textContent = t; tip.style.opacity = '1'; return; }
    tip = document.createElement('div');
    tip.textContent = t;
    tip.style.cssText = 'position:fixed;left:50%;top:18px;transform:translateX(-50%);z-index:2147483002;' +
      'background:rgba(28,28,30,.92);color:#fff;padding:8px 16px;border-radius:99px;' +
      'font:600 12.5px/1.4 -apple-system,sans-serif;transition:opacity .3s';
    document.body.appendChild(tip);
    setTimeout(function () { if (tip) { tip.style.opacity = '0'; setTimeout(function () { if (tip) { tip.remove(); tip = null; } }, 400); } }, 1400);
  }

  function render() {
    if (!dot) return;
    dot.classList.toggle('off', !S.on);
    dot.title = S.on ? '复制解锁：已开启（点击设置）' : '复制解锁：已关闭';
    try {
      if (root) {
        root.getElementById('st').textContent = S.on ? '已开启' : '已关闭';
        var sw = root.getElementById('sw');
        if (sw) sw.classList.toggle('on', S.on);
        root.getElementById('a1').textContent = S.removedAttrs;
        root.getElementById('a2').textContent = S.removedClasses;
        root.getElementById('a3').textContent = S.blockedCalls || 0;
      }
    } catch (e) {}
  }

  function build() {
    if (!document.body || document.getElementById('copyfree-host')) return;
    host = document.createElement('div');
    host.id = 'copyfree-host';
    root = host.attachShadow({ mode: 'open' });
    var st = document.createElement('style');
    st.textContent = CSS;
    root.appendChild(st);

    dot = document.createElement('button');
    dot.className = 'dot';
    dot.textContent = '解开';
    root.appendChild(dot);

    var card = document.createElement('div');
    card.className = 'card';
    card.innerHTML =
      '<h4>网页复制解锁</h4>' +
      '<div class="row"><span>状态</span><b id="st">已开启</b></div>' +
      '<div class="sw"><span>解除限制</span><div class="tg" id="sw"><i></i></div></div>' +
      '<div class="row"><span>清理内联事件</span><b id="a1">0</b></div>' +
      '<div class="row"><span>清理禁选样式</span><b id="a2">0</b></div>' +
      '<div class="row"><span>拦截 preventDefault</span><b id="a3">0</b></div>' +
      '<div class="hint">Alt + C 可强制复制选中文字</div>';
    root.appendChild(card);
    document.body.appendChild(host);

    dot.onclick = function () {
      card.style.display = card.style.display === 'block' ? 'none' : 'block';
    };
    var sw = root.getElementById('sw');
    sw.onclick = function () {
      S.on = !S.on;
      try { localStorage.setItem(KEY, S.on ? '1' : '0'); } catch (e) {}
      applyStyle();
      render();
    };
    render();
  }

  function boot() {
    applyStyle();
    stripInline(document);
    stripClasses(document);
    build();
    /* 动态内容：每 2 秒补扫一次（低成本） */
    setInterval(function () {
      if (!S.on) return;
      stripClasses(document);
    }, 2000);
    window.addEventListener('load', function () { stripInline(document); stripClasses(document); });
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', boot);
  } else {
    boot();
  }

  window.__copyfree = { state: S, forceCopy: forceCopy };
})();