// ==UserScript==
// @name         网页表格导出工具
// @namespace    http://tampermonkey.net/
// @version      0.2
// @description  为网页表格添加Excel导出功能,适合于下载任意网站或者像DeepSeek ChatGPT等生成的表格，导出按钮显示在表格右上角
// @author       HiKey
// @match        *://*/*
// @require      https://cdn.jsdelivr.net/npm/xlsx@0.18.5/dist/xlsx.full.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/2.0.5/FileSaver.min.js
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    // 添加简约按钮样式
    GM_addStyle(`
        .export-btn-group {
            position: absolute;
            top: 2px;
            right: 2px;
            z-index: 1000;
            opacity: 0.8;
            transition: opacity 0.3s;
        }
        .export-btn-group:hover {
            opacity: 1;
        }
        .export-btn {
            padding: 3px 8px;
            background: rgba(76, 175, 80, 0.7);
            color: white;
            border: none;
            border-radius: 2px;
            cursor: pointer;
            font-size: 11px;
            font-family: Arial;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            transition: background 0.2s;
        }
        .export-btn:hover {
            background: rgba(68, 157, 68, 0.9);
        }
    `);

    // 处理表格
    function processTables() {
        document.querySelectorAll('table').forEach(table => {
            if (table.dataset.processed) return;
            
            // 创建按钮容器
            const btnGroup = document.createElement('div');
            btnGroup.className = 'export-btn-group';
            
            // 创建单个导出按钮
            const btnXLSX = createButton('导出Excel', () => exportTable(table, 'xlsx'));
            btnGroup.append(btnXLSX);
            
            // 添加轻量级包装
            const wrapper = document.createElement('div');
            wrapper.style.position = 'relative';
            wrapper.style.display = 'inline-block';
            table.parentNode.insertBefore(wrapper, table);
            wrapper.appendChild(table);
            wrapper.appendChild(btnGroup);
            
            table.dataset.processed = true;
        });
    }

    // 创建简洁按钮
    function createButton(text, onClick) {
        const btn = document.createElement('button');
        btn.className = 'export-btn';
        btn.textContent = text;
        btn.title = '点击导出为Excel文件';
        btn.addEventListener('click', onClick);
        return btn;
    }

    // 导出功能
    function exportTable(table, type) {
        const title = document.title.replace(/[^a-zA-Z0-9]/g, '_').substring(0, 30);
        const timestamp = new Date().toISOString().slice(0, 10);
        
        const wb = XLSX.utils.book_new();
        const ws = XLSX.utils.table_to_sheet(table);
        XLSX.utils.book_append_sheet(wb, ws, '数据');
        XLSX.writeFile(wb, `${title}_${timestamp}.xlsx`);
    }

    // 优化初始化逻辑
    const init = () => {
        processTables();
        new MutationObserver(mutations => {
            mutations.forEach(mutation => {
                if (mutation.addedNodes.length) processTables();
            });
        }).observe(document.body, { childList: true, subtree: true });
    };

    if (document.readyState === 'complete') init();
    else window.addEventListener('load', init);
})();