// ==UserScript==
// @name         畅捷通下载助手QQ1277745546
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Guaranteed panel display version
// @author       技术小胥QQ1277745546
// @match        https://www.chanjetvip.com/product/goods/detail?id=*
// @grant        GM_xmlhttpRequest
// @grant        GM_notification
// @grant        GM_addStyle
// @grant        GM_setClipboard
// @grant        unsafeWindow
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    // 确保只运行一次
    if (window.tplusPanelLoaded) return;
    window.tplusPanelLoaded = true;

    // 自定义样式 - 精简版确保兼容性
    const css = `
        #tplus-download-panel {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: white;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            z-index: 999999;
            width: 350px;
            font-family: Arial, sans-serif;
        }
        .tplus-btn {
            padding: 5px 10px;
            margin: 3px;
            border: none;
            border-radius: 3px;
            cursor: pointer;
        }
        .tplus-scan-btn { background: #2196F3; color: white; }
        .tplus-fetch-btn { background: #FF9800; color: white; }
        .tplus-copy-btn { background: #4CAF50; color: white; }
        #tplus-link-container {
            max-height: 300px;
            overflow-y: auto;
            margin: 10px 0;
            border: 1px solid #eee;
            padding: 5px;
        }
        .tplus-status {
            font-size: 12px;
            color: #666;
            margin-top: 5px;
        }
    `;
    const style = document.createElement('style');
    style.textContent = css;
    document.head.appendChild(style);

    // 创建面板函数 - 增强稳定性
    function createPanel() {
        // 移除可能存在的旧面板
        const oldPanel = document.getElementById('tplus-download-panel');
        if (oldPanel) oldPanel.remove();

        const panel = document.createElement('div');
        panel.id = 'tplus-download-panel';
        panel.innerHTML = `
            <h3 style="margin-top:0; font-size:16px;">畅捷通下载助手</h3>
            <button id="tplus-scan-btn" class="tplus-btn tplus-scan-btn">1. 扫描链接</button>
            <button id="tplus-fetch-btn" class="tplus-btn tplus-fetch-btn" disabled>2. 获取真实链接</button>
            <button id="tplus-copy-btn" class="tplus-btn tplus-copy-btn" disabled>3. 复制全部</button>
            <div id="tplus-link-container"></div>
            <div id="tplus-status" class="tplus-status">准备就绪</div>
        `;

        // 多种追加方式确保面板显示
        const appendMethods = [
            () => document.body.appendChild(panel),
            () => document.documentElement.appendChild(panel),
            () => {
                const container = document.createElement('div');
                container.id = 'tplus-container';
                container.appendChild(panel);
                document.body.appendChild(container);
            }
        ];

        for (const method of appendMethods) {
            try {
                method();
                break;
            } catch(e) {
                console.log('Panel append method failed, trying next');
            }
        }

        // 添加事件监听
        document.getElementById('tplus-scan-btn').addEventListener('click', scanLinks);
        document.getElementById('tplus-fetch-btn').addEventListener('click', fetchLinks);
        document.getElementById('tplus-copy-btn').addEventListener('click', copyLinks);

        // 最终检查面板是否存在
        setTimeout(() => {
            if (!document.getElementById('tplus-download-panel')) {
                console.error('Panel still not found, using last resort');
                document.write('<div id="tplus-download-panel"></div>');
                document.getElementById('tplus-download-panel').innerHTML = panel.innerHTML;
            }
        }, 1000);
    }

    // 存储链接数据
    let links = [];

    // 扫描链接
    function scanLinks() {
        updateStatus('正在扫描链接...');
        const scanBtn = document.getElementById('tplus-scan-btn');
        scanBtn.disabled = true;

        // 多种选择器尝试
        const selectors = [
            'a[href*="/product/goods/download-version"]',
            'a[onclick*="download"]',
            'a:contains("下载该版本")'
        ];

        let foundLinks = [];
        for (const selector of selectors) {
            if (foundLinks.length === 0) {
                foundLinks = [...document.querySelectorAll(selector)];
            }
        }

        if (foundLinks.length === 0) {
            updateStatus('未找到下载链接，请刷新页面重试');
            scanBtn.disabled = false;
            return;
        }

        links = foundLinks.map(link => ({
            element: link,
            url: link.href,
            realUrl: null,
            status: '待获取'
        }));

        displayLinks();
        document.getElementById('tplus-fetch-btn').disabled = false;
        scanBtn.disabled = false;
        updateStatus(`找到 ${links.length} 个下载链接`);
    }

    // 显示链接
    function displayLinks() {
        const container = document.getElementById('tplus-link-container');
        container.innerHTML = '';

        links.forEach((link, index) => {
            const linkDiv = document.createElement('div');
            linkDiv.style.margin = '5px 0';
            linkDiv.style.padding = '5px';
            linkDiv.style.borderBottom = '1px dashed #eee';
            linkDiv.innerHTML = `
                <div>链接 ${index + 1}: <span style="font-weight:bold;">${link.status}</span></div>
                <div style="font-size:12px; word-break:break-all;">${link.realUrl || link.url}</div>
            `;
            container.appendChild(linkDiv);
        });
    }

    // 获取真实链接
    function fetchLinks() {
        const fetchBtn = document.getElementById('tplus-fetch-btn');
        fetchBtn.disabled = true;
        updateStatus('开始获取真实链接...');

        let completed = 0;
        links.forEach((link, index) => {
            setTimeout(() => {
                GM_xmlhttpRequest({
                    method: 'GET',
                    url: link.url,
                    headers: {
                        'X-Requested-With': 'XMLHttpRequest',
                        'Referer': window.location.href
                    },
                    onload: function(response) {
                        const finalUrl = response.finalUrl || response.responseURL;
                        if (finalUrl && finalUrl !== link.url) {
                            link.realUrl = finalUrl;
                            link.status = '获取成功';
                        } else {
                            link.status = '获取失败';
                        }
                        completed++;
                        displayLinks();
                        
                        if (completed === links.length) {
                            fetchBtn.disabled = false;
                            document.getElementById('tplus-copy-btn').disabled = false;
                            updateStatus(`完成！成功: ${links.filter(l => l.status === '获取成功').length}/${links.length}`);
                        }
                    },
                    onerror: function() {
                        link.status = '获取失败';
                        completed++;
                        displayLinks();
                        
                        if (completed === links.length) {
                            fetchBtn.disabled = false;
                            document.getElementById('tplus-copy-btn').disabled = false;
                            updateStatus(`完成！成功: ${links.filter(l => l.status === '获取成功').length}/${links.length}`);
                        }
                    }
                });
            }, index * 1500); // 间隔1.5秒
        });
    }

    // 复制链接
    function copyLinks() {
        const urls = links.map(link => link.realUrl || link.url).join('\n');
        GM_setClipboard(urls);
        updateStatus('已复制所有链接到剪贴板');
        GM_notification({
            title: '复制成功',
            text: '所有链接已复制',
            timeout: 2000
        });
    }

    // 更新状态
    function updateStatus(msg) {
        const statusEl = document.getElementById('tplus-status');
        if (statusEl) statusEl.textContent = msg;
    }

    // 多重初始化保障
    function init() {
        // 方法1: DOMContentLoaded
        if (document.readyState !== 'loading') {
            createPanel();
        } else {
            document.addEventListener('DOMContentLoaded', createPanel);
        }
        
        // 方法2: load事件
        window.addEventListener('load', createPanel);
        
        // 方法3: 定时检查
        let retries = 0;
        const checkInterval = setInterval(() => {
            if (document.getElementById('tplus-download-panel') || retries > 5) {
                clearInterval(checkInterval);
            } else {
                createPanel();
                retries++;
            }
        }, 1000);
    }

    // 启动
    init();
})();