// ==UserScript==
// @name         解锁PTA复制粘贴限制
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  这个用户脚本旨在解除PTA（拼题A、Pintia）平台上的复制和粘贴限制，使用户能够自由复制和粘贴文本
// @author       MadelineCarter
// @match        https://pintia.cn/problem-sets/*/exam/problems/*
// @match        https://pintia.cn/problem-sets/*/exam/*
// @grant        none
// @license      All Rights Reserved
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';

    // 解锁文本选择功能
    const enableTextSelection = () => {
        document.body.style.userSelect = 'text';
        document.body.style.webkitUserSelect = 'text';
        document.body.style.msUserSelect = 'text';
        document.body.style.MozUserSelect = 'text';
    };

    // 移除特定事件监听器
    const removeEventListeners = (element, events) => {
        events.forEach(event => {
            const newElement = element.cloneNode(true);
            element.parentNode.replaceChild(newElement, element);
        });
    };

    // 解锁复制、粘贴和拖放
    const unlockClipboardRestrictions = () => {
        ['copy', 'paste', 'drop', 'beforeinput'].forEach(eventName => {
            document.addEventListener(eventName, (e) => {
                e.stopPropagation(); // 仅阻止限制相关的事件传播
            }, true);
        });
    };

    // 兼容动态加载的内容
    const observeDOMChanges = () => {
        const observer = new MutationObserver(() => {
            enableTextSelection();
            unlockClipboardRestrictions();
        });

        observer.observe(document, { childList: true, subtree: true });
    };

    // 初始化解锁
    const initUnlock = () => {
        enableTextSelection();
        unlockClipboardRestrictions();
        observeDOMChanges();
    };

    // 确保脚本延迟加载，避免与页面初始化冲突
    window.addEventListener('load', () => {
        initUnlock();
    });
})();

/*
    This script is not licensed for use, modification, or distribution.
    All rights are reserved by the author.
*/