// ==UserScript==
// @name                 CSDN文库VIP答案解锁复制
// @namespace            csdn.wenku.unlock
// @version              1.0.0
// @description          🔥 专门针对wenku.csdn.net的答案解锁，移除遮罩、解锁复制、尝试显示隐藏答案
// @author               参考52pojie方案
// @match                *://wenku.csdn.net/*
// @grant                none
// @run-at               document-start
// ==/UserScript==

(function() {
    'use strict';
    
    console.log('[WenkuUnlock] CSDN文库解锁器启动...');
    
    // ========== 第一步：注入CSS移除所有限制 ==========
    const style = document.createElement('style');
    style.textContent = `
        /* 移除VIP遮罩 */
        .vip-mask, .open, .vip, .vip-limit-mask, .pay-wall,
        .hide-article-box, .column-mask, .login-mask,
        .passport-login-container, .login-container, .login-box {
            display: none !important;
            visibility: hidden !important;
        }
        
        /* 展开内容区域 */
        .article-box .cont.first-show,
        .article-box .cont,
        .content-box,
        .answer-content {
            max-height: none !important;
            height: auto !important;
            overflow: visible !important;
        }
        
        /* 移除模糊 */
        .blur, .blur-content, .vip-blur {
            filter: none !important;
        }
        
        /* 启用复制 */
        body, .article-box, .cont, .answer-content {
            -webkit-user-select: text !important;
            user-select: text !important;
        }
        
        /* 移除按钮 */
        .btn-readmore, .show-more-btn, .open-btn, .vip-btn {
            display: none !important;
        }
    `;
    
    // 安全注入CSS
    const injectCSS = () => {
        if (document.head) {
            document.head.appendChild(style);
            return true;
        }
        return false;
    };
    
    if (!injectCSS()) {
        document.addEventListener('DOMContentLoaded', injectCSS);
    }
    
    // ========== 第二步：核心解锁函数 ==========
    const unlock = () => {
        // 1. 移除所有遮罩层
        document.querySelectorAll('.vip-mask, .open, .vip, .hide-article-box, .login-mask').forEach(el => {
            el.remove();
            console.log('[WenkuUnlock] 移除遮罩:', el.className);
        });
        
        // 2. 展开内容区域（关键！）
        const selectors = [
            '.article-box .cont.first-show',
            '.article-box .cont',
            '.content-box',
            '.answer-content',
            '.article-content'
        ];
        
        selectors.forEach(sel => {
            document.querySelectorAll(sel).forEach(el => {
                el.style.maxHeight = 'none';
                el.style.height = 'auto';
                el.style.overflow = 'visible';
                console.log('[WenkuUnlock] 展开内容:', sel);
            });
        });
        
        // 3. 移除模糊效果
        document.querySelectorAll('.blur, .blur-content, .vip-blur').forEach(el => {
            el.style.filter = 'none';
        });
        
        // 4. 启用复制
        document.body.oncopy = null;
        document.oncopy = null;
        document.querySelectorAll('*').forEach(el => {
            el.style.userSelect = 'text';
        });
    };
    
    // ========== 第三步：劫持点击事件 ==========
    // 阻止跳转到开通会员页面
    document.addEventListener('click', (e) => {
        const target = e.target;
        
        // 检查是否点击了"查看答案"或类似按钮
        if (target.textContent.includes('查看') || 
            target.textContent.includes('答案') ||
            target.className.includes('open') ||
            target.className.includes('vip')) {
            
            console.log('[WenkuUnlock] 拦截点击:', target.textContent);
            
            // 阻止默认行为
            e.preventDefault();
            e.stopPropagation();
            
            // 尝试解锁
            unlock();
            
            // 如果内容已经加载但没显示，强制显示
            document.querySelectorAll('[style*="display: none"]').forEach(el => {
                if (el.textContent.length > 50) { // 假设内容较长
                    el.style.display = 'block';
                    console.log('[WenkuUnlock] 强制显示隐藏内容');
                }
            });
            
            return false;
        }
    }, true);
    
    // ========== 第四步：多次执行解锁 ==========
    unlock();
    setTimeout(unlock, 100);
    setTimeout(unlock, 500);
    setTimeout(unlock, 1000);
    setTimeout(unlock, 2000);
    
    // 页面加载完成后
    window.addEventListener('load', () => {
        unlock();
        setTimeout(unlock, 1000);
    });
    
    // ========== 第五步：监听DOM变化 ==========
    const startObserver = () => {
        if (!document.body) {
            setTimeout(startObserver, 100);
            return;
        }
        
        const observer = new MutationObserver((mutations) => {
            let needUnlock = false;
            mutations.forEach((mutation) => {
                if (mutation.addedNodes.length > 0) {
                    needUnlock = true;
                }
            });
            if (needUnlock) {
                unlock();
            }
        });
        
        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
        
        console.log('[WenkuUnlock] DOM观察者已启动');
    };
    
    startObserver();
    
    console.log('[WenkuUnlock] 初始化完成！');
    console.log('[WenkuUnlock] 现在点击"查看答案"应该可以直接显示内容');
    
})();