// ==UserScript==
// @name         问卷星解除复制粘贴限制
// @namespace    https://scriptscat.org/
// @version      1.0.0
// @description  解除问卷星页面的复制/粘贴/右键/选中限制
// @match        *://*.wjx.cn/*
// @match        *://ks.wjx.com/*
// @match        *://*.wjx.top/*
// @run-at       document-start
// @grant        none
// @tag 问卷星
// @tag 学习
// @tag copy
// @tag paste
// @author       ayiyaha
// @license      Apache-2.0
// ==/UserScript==

(function () {
  'use strict';

  const BLOCK_EVENTS = [
    'contextmenu', 'copy', 'cut', 'paste',
    'selectstart', 'dragstart'
  ];

  const style = document.createElement('style');
  style.textContent = `
    html, body, * {
      -webkit-user-select: text !important;
      -moz-user-select: text !important;
      -ms-user-select: text !important;
      user-select: text !important;
      -webkit-touch-callout: default !important;
    }
  `;
  (document.head || document.documentElement).appendChild(style);

  const allowHandler = (e) => {
    e.stopImmediatePropagation();
    e.stopPropagation();
  };
  BLOCK_EVENTS.forEach((evt) => {
    document.addEventListener(evt, allowHandler, true);
    window.addEventListener(evt, allowHandler, true);
  });

  function clearDom0Handlers(root = document) {
    const nodes = root.querySelectorAll ? root.querySelectorAll('*') : [];
    const all = [root, ...nodes];
    for (const el of all) {
      for (const evt of BLOCK_EVENTS) {
        const key = 'on' + evt;
        if (key in el) {
          try {
            el[key] = null;
          } catch (_) {}
        }
      }
    }
  }

  function removeOverlays(root = document) {
    const selectors = [
      '#divS',
      '#divWorkError',
      '[id*="mask"]',
      '[class*="mask"]',
      '[class*="overlay"]'
    ];
    for (const sel of selectors) {
      root.querySelectorAll(sel).forEach((el) => {
        const styleText = (el.getAttribute('style') || '').toLowerCase();
        const isFullscreen =
          styleText.includes('position: fixed') &&
          styleText.includes('top: 0') &&
          styleText.includes('left: 0') &&
          styleText.includes('right: 0') &&
          styleText.includes('bottom: 0');

        if (sel === '#divS' || isFullscreen) {
          el.style.display = 'none';
          el.style.pointerEvents = 'none';
        }
      });
    }
  }

  function unlockInputs(root = document) {
    const inputs = root.querySelectorAll('textarea, input[type="text"], input:not([type])');
    inputs.forEach((el) => {
      if (el.hasAttribute('readonly')) {
        el.removeAttribute('readonly');
      }
      if (el.hasAttribute('disabled')) {
        el.removeAttribute('disabled');
      }
      el.style.userSelect = 'text';
      el.style.webkitUserSelect = 'text';
    });
  }

  function applyAll(root = document) {
    clearDom0Handlers(root);
    removeOverlays(root);
    unlockInputs(root);
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => applyAll(document), { once: true });
  } else {
    applyAll(document);
  }

  const observer = new MutationObserver((mutations) => {
    for (const m of mutations) {
      m.addedNodes.forEach((node) => {
        if (node.nodeType === 1) {
          applyAll(node);
        }
      });
    }
  });
  observer.observe(document.documentElement, {
    childList: true,
    subtree: true
  });

  setInterval(() => applyAll(document), 1500);

  console.log('[WJX-Unlock] copy/paste/contextmenu unlock injected.');
})();