// ==UserScript==
// @name         学习通复制粘贴助手 Chaoxing Copy Helper
// @namespace    https://github.com/lcandy2/user.js/tree/main/websites/chaoxing.com/chaoxing-copy-helper
// @version      1.4
// @author       甜檸Cirtron (lcandy2)
// @description  📝解除超星学习通复制粘贴限制，解除学习通复制乱码问题；✨“一键复制题目”、“一键粘贴到答案”、“复制好友答案”等功能。🧹大小仅1.62KB，极小尺寸，无需任何权限，无需任何配置，安装即用。💛安全开源可读，无附加功能或远程代码，防止窃取其他信息
// @license      AGPL-3.0-or-later
// @copyright    lcandy2 All Rights Reserved
// @homepage     https://greasyfork.org/scripts/496958
// @homepageURL  https://greasyfork.org/scripts/496958
// @source       https://github.com/lcandy2/user.js/tree/main/websites/chaoxing.com/chaoxing-copy-helper
// @match        *://*.chaoxing.com/*
// ==/UserScript==

(function () {
  'use strict';

  const removeCopyLimits = () => {
    document.body.removeAttribute("onselectstart");
    document.documentElement.style.userSelect = "unset";
    if (UE && UE.instants && typeof UE.instants === "object") {
      for (const [key, instance] of Object.entries(UE.instants)) {
        try {
          if (instance.options) {
            instance.options.disablePasteImage = false;
          }
          if (instance.removeListener) {
            instance.removeListener("beforepaste", editorPaste);
          }
        } catch (error) {
          console.error("[Chaoxing Copy Helper] Failed to remove copy limits from instance", key, error);
        }
      }
    }
    console.info("[Chaoxing Copy Helper] Removed copy limits.");
  };
  const href = window.location.href;
  const addBranding = () => {
    addExamBranding();
  };
  const addExamBranding = () => {
    if (href.includes("exam-ans/exam/test")) {
      const markInfo = document.querySelector(".mark_info");
      if (markInfo) {
        const branding = document.createElement("p");
        branding.innerHTML = `已解除复制/粘贴限制<br><span style="font-size: 12px;">- 由 <a href="https://greasyfork.org/scripts/496958" target="_blank">学习通复制粘贴助手 Chaoxing Copy Helper 提供</a> -</span>`;
        markInfo.appendChild(branding);
      }
    }
  };
  const removeDebuggerLimit = () => {
    const constructorHook = Function.prototype.constructor;
    Function.prototype.constructor = (s) => {
      if (s === "debugger") {
        return () => {
        };
      }
      return constructorHook(s);
    };
  };
  setTimeout(() => {
    removeDebuggerLimit();
    try {
      removeCopyLimits();
    } catch (error) {
      console.error("[Chaoxing Copy Helper] Failed to remove copy limits.", error);
    }
    addBranding();
  }, 1e3);

})();