// ==UserScript==
// @name         磁力链接增强器
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  识别、复制、解析磁力链接，支持一键复制hash和转换为下载链接
// @author       YourName
// @match        *://*/*
// @grant        GM_setClipboard
// @grant        GM_xmlhttpRequest
// @connect      *
// @run-at       document-idle
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    // ==================== 配置 ====================
    const CONFIG = {
        // 识别关键字（可自定义添加更多）
        keywords: ['magnet:', 'magnet:?', 'xt=urn:btih:'],
        // 样式配置
        style: {
            buttonBg: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
            buttonHoverBg: 'linear-gradient(135deg, #764ba2 0%, #667eea 100%)',
            buttonColor: '#fff',
            buttonRadius: '4px',
            buttonFontSize: '12px',
            buttonPadding: '4px 10px',
            badgeBg: '#ff6b6b',
            badgeColor: '#fff'
        }
    };

    // ==================== 工具函数 ====================

    /**
     * 从磁力链接提取 info hash
     */
    function extractInfoHash(magnet) {
        const match = magnet.match(/xt=urn:btih:([a-fA-F0-9]{32,40})/i);
        return match ? match[1].toUpperCase() : null;
    }

    /**
     * 从磁力链接提取显示名称
     */
    function extractName(magnet) {
        const match = magnet.match(/dn=([^&]+)/i);
        return match ? decodeURIComponent(match[1]) : '未知文件';
    }

    /**
     * 复制到剪贴板
     */
    function copyToClipboard(text, button) {
        GM_setClipboard(text);
        const originalText = button.textContent;
        button.textContent = '已复制 ✓';
        button.style.background = '#51cf66';
        setTimeout(() => {
            button.textContent = originalText;
            button.style.background = '';
        }, 1500);
    }

    /**
     * 显示通知
     */
    function showNotification(message, type = 'success') {
        const notification = document.createElement('div');
        notification.textContent = message;
        notification.style.cssText = `
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 12px 24px;
            background: ${type === 'success' ? '#51cf66' : type === 'error' ? '#ff6b6b' : '#339af0'};
            color: white;
            border-radius: 8px;
            font-size: 14px;
            z-index: 999999;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            animation: slideIn 0.3s ease;
        `;

        const style = document.createElement('style');
        style.textContent = `
            @keyframes slideIn {
                from { transform: translateX(100%); opacity: 0; }
                to { transform: translateX(0); opacity: 1; }
            }
        `;
        document.head.appendChild(style);
        document.body.appendChild(notification);

        setTimeout(() => {
            notification.style.animation = 'slideIn 0.3s ease reverse';
            setTimeout(() => notification.remove(), 300);
        }, 2000);
    }

    /**
     * 格式化文件大小
     */
    function formatSize(bytes) {
        if (!bytes) return '未知';
        const units = ['B', 'KB', 'MB', 'GB', 'TB'];
        let i = 0;
        while (bytes >= 1024 && i < units.length - 1) {
            bytes /= 1024;
            i++;
        }
        return `${bytes.toFixed(2)} ${units[i]}`;
    }

    // ==================== 样式注入 ====================
    function injectStyles() {
        const css = `
            /* 磁力链接容器样式 */
            .magnet-enhance-wrapper {
                display: inline-flex;
                align-items: center;
                gap: 8px;
                flex-wrap: wrap;
                margin: 4px 0;
            }

            /* 原始磁力链接样式 */
            .magnet-enhance-link {
                color: #3b82f6 !important;
                text-decoration: none !important;
                border-bottom: 1px dashed #3b82f6 !important;
                word-break: break-all;
                transition: all 0.2s;
            }

            .magnet-enhance-link:hover {
                color: #2563eb !important;
                border-bottom-color: #2563eb !important;
                background: rgba(59, 130, 246, 0.1);
            }

            /* 按钮通用样式 */
            .magnet-btn {
                display: inline-flex;
                align-items: center;
                gap: 4px;
                padding: ${CONFIG.style.buttonPadding};
                font-size: ${CONFIG.style.buttonFontSize};
                color: ${CONFIG.style.buttonColor};
                background: ${CONFIG.style.buttonBg};
                border: none;
                border-radius: ${CONFIG.style.buttonRadius};
                cursor: pointer;
                transition: all 0.2s;
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
                white-space: nowrap;
            }

            .magnet-btn:hover {
                background: ${CONFIG.style.buttonHoverBg};
                transform: translateY(-1px);
                box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
            }

            .magnet-btn:active {
                transform: translateY(0);
            }

            /* 按钮图标 */
            .magnet-btn svg {
                width: 14px;
                height: 14px;
                fill: currentColor;
            }

            /* 按钮组 */
            .magnet-btn-group {
                display: inline-flex;
                gap: 4px;
            }

            /* Hash 显示标签 */
            .magnet-hash-badge {
                display: inline-block;
                padding: 2px 8px;
                background: rgba(255, 107, 107, 0.15);
                color: #ff6b6b;
                border-radius: 4px;
                font-family: monospace;
                font-size: 11px;
                max-width: 120px;
                overflow: hidden;
                text-overflow: ellipsis;
            }

            /* 展开/收起区块 */
            .magnet-expand-panel {
                width: 100%;
                margin-top: 8px;
                padding: 12px;
                background: #f8f9fa;
                border-radius: 8px;
                border: 1px solid #e9ecef;
            }

            .magnet-expand-header {
                display: flex;
                align-items: center;
                justify-content: space-between;
                cursor: pointer;
                margin-bottom: 8px;
            }

            .magnet-expand-title {
                font-weight: 600;
                color: #495057;
            }

            .magnet-expand-icon {
                transition: transform 0.2s;
            }

            .magnet-expand-icon.open {
                transform: rotate(180deg);
            }

            .magnet-expand-content {
                display: none;
            }

            .magnet-expand-content.show {
                display: block;
            }

            /* 信息行 */
            .magnet-info-row {
                display: flex;
                align-items: center;
                gap: 12px;
                padding: 6px 0;
                border-bottom: 1px solid #e9ecef;
                font-size: 13px;
            }

            .magnet-info-row:last-child {
                border-bottom: none;
            }

            .magnet-info-label {
                color: #868e96;
                min-width: 70px;
            }

            .magnet-info-value {
                color: #212529;
                word-break: break-all;
            }

            /* 搜索链接 */
            .magnet-search-link {
                color: #3b82f6;
                text-decoration: none;
                margin-right: 12px;
            }

            .magnet-search-link:hover {
                text-decoration: underline;
            }
        `;

        const style = document.createElement('style');
        style.id = 'magnet-enhance-styles';
        style.textContent = css;
        document.head.appendChild(style);
    }

    // ==================== SVG 图标 ====================
    const icons = {
        copy: `<svg viewBox="0 0 24 24"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg>`,
        hash: `<svg viewBox="0 0 24 24"><path d="M17 4h-3V2h-4v2H7v2h10V4zm-5 8h2v2h-2v-2zm0 4h2v2h-2v-2zm-4-4h2v2H8v-2zm0 4h2v2H8v-2zm-4 0h2v2H4v-2zm0-4H4v2h2v-2zm0 4H4v2h2v-2z"/></svg>`,
        download: `<svg viewBox="0 0 24 24"><path d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z"/></svg>`,
        search: `<svg viewBox="0 0 24 24"><path d="M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z"/></svg>`,
        chevron: `<svg viewBox="0 0 24 24"><path d="M7.41 8.59L12 13.17l4.59-4.58L18 10l-6 6-6-6 1.41-1.41z"/></svg>`,
        link: `<svg viewBox="0 0 24 24"><path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/></svg>`
    };

    // ==================== 创建按钮 ====================
    function createCopyButton(magnet, text = '复制链接') {
        const btn = document.createElement('button');
        btn.className = 'magnet-btn magnet-copy-btn';
        btn.innerHTML = `${icons.copy}<span>${text}</span>`;
        btn.addEventListener('click', (e) => {
            e.preventDefault();
            e.stopPropagation();
            copyToClipboard(magnet, btn);
        });
        return btn;
    }

    function createHashButton(hash) {
        const btn = document.createElement('button');
        btn.className = 'magnet-btn magnet-hash-btn';
        btn.innerHTML = `${icons.hash}<span>Hash</span>`;
        btn.title = '复制 Info Hash';
        btn.addEventListener('click', (e) => {
            e.preventDefault();
            e.stopPropagation();
            copyToClipboard(hash, btn);
            showNotification(`已复制 Hash: ${hash}`);
        });
        return btn;
    }

    function createSearchButton(magnet) {
        const name = extractName(magnet);
        const hash = extractInfoHash(magnet);
        const btn = document.createElement('button');
        btn.className = 'magnet-btn magnet-search-btn';
        btn.innerHTML = `${icons.search}<span>搜索</span>`;
        btn.title = '在线搜索资源';

        btn.addEventListener('click', (e) => {
            e.preventDefault();
            e.stopPropagation();

            const searchUrl = hash
                ? `https://itorrents.org/torrent/${hash}.torrent`
                : `https://www.google.com/search?q=${encodeURIComponent(name)}`;

            window.open(searchUrl, '_blank');
        });
        return btn;
    }

    // ==================== 处理纯文本磁力链接 ====================
    function processTextNode(textNode) {
        const text = textNode.textContent;
        const magnetRegex = /magnet:\?[^<>\"\s]+/g;
        const matches = text.match(magnetRegex);

        if (!matches || matches.length === 0) return;

        const fragment = document.createDocumentFragment();
        let lastIndex = 0;

        matches.forEach((magnet, index) => {
            const startIndex = text.indexOf(magnet, lastIndex);

            // 添加匹配前的文本
            if (startIndex > lastIndex) {
                fragment.appendChild(document.createTextNode(text.substring(lastIndex, startIndex)));
            }

            // 创建磁力链接包装器
            const wrapper = document.createElement('span');
            wrapper.className = 'magnet-enhance-wrapper';

            // 创建链接元素
            const link = document.createElement('a');
            link.className = 'magnet-enhance-link';
            link.href = magnet;
            link.textContent = magnet.length > 60 ? magnet.substring(0, 57) + '...' : magnet;
            link.title = magnet;
            link.target = '_blank';

            wrapper.appendChild(link);

            // 提取 hash 并显示
            const hash = extractInfoHash(magnet);
            if (hash) {
                const badge = document.createElement('span');
                badge.className = 'magnet-hash-badge';
                badge.textContent = hash.substring(0, 8) + '...';
                badge.title = '完整 Hash: ' + hash;
                wrapper.appendChild(badge);
            }

            // 添加按钮组
            const btnGroup = document.createElement('span');
            btnGroup.className = 'magnet-btn-group';

            btnGroup.appendChild(createCopyButton(magnet, '复制'));
            if (hash) {
                btnGroup.appendChild(createHashButton(hash));
            }
            btnGroup.appendChild(createSearchButton(magnet));

            wrapper.appendChild(btnGroup);

            // 添加分隔符（如果不是最后一个）
            if (index < matches.length - 1) {
                const separator = document.createTextNode(' ');
                fragment.appendChild(wrapper);
                fragment.appendChild(separator);
            } else {
                fragment.appendChild(wrapper);
            }

            lastIndex = startIndex + magnet.length;
        });

        // 添加剩余文本
        if (lastIndex < text.length) {
            fragment.appendChild(document.createTextNode(text.substring(lastIndex)));
        }

        textNode.parentNode.replaceChild(fragment, textNode);
    }

    // ==================== 处理已有 href 的磁力链接 ====================
    function processMagnetLinks() {
        const links = document.querySelectorAll('a[href^="magnet:"]');

        links.forEach(link => {
            // 避免重复处理
            if (link.dataset.magnetEnhanced) return;
            link.dataset.magnetEnhanced = 'true';

            const magnet = link.getAttribute('href');
            const hash = extractInfoHash(magnet);
            const name = extractName(magnet);

            // 更新显示文本
            if (!link.textContent || link.textContent === magnet) {
                link.textContent = name !== '未知文件' ? name : (magnet.length > 50 ? magnet.substring(0, 47) + '...' : magnet);
            }

            link.classList.add('magnet-enhance-link');

            // 创建包装器
            const wrapper = document.createElement('span');
            wrapper.className = 'magnet-enhance-wrapper';
            link.parentNode.insertBefore(wrapper, link);
            wrapper.appendChild(link);

            // 添加 hash 标签
            if (hash) {
                const badge = document.createElement('span');
                badge.className = 'magnet-hash-badge';
                badge.textContent = hash.substring(0, 8) + '...';
                badge.title = '完整 Hash: ' + hash;
                wrapper.appendChild(badge);
            }

            // 添加按钮组
            const btnGroup = document.createElement('span');
            btnGroup.className = 'magnet-btn-group';
            btnGroup.appendChild(createCopyButton(magnet, '复制'));
            if (hash) {
                btnGroup.appendChild(createHashButton(hash));
            }
            btnGroup.appendChild(createSearchButton(magnet));
            wrapper.appendChild(btnGroup);
        });
    }

    // ==================== 主处理函数 ====================
    function processPage() {
        injectStyles();
        processMagnetLinks();

        // 处理纯文本中的磁力链接
        const walker = document.createTreeWalker(
            document.body,
            NodeFilter.SHOW_TEXT,
            {
                acceptNode: function(node) {
                    // 跳过已有磁力链接的节点
                    if (node.parentNode.closest('.magnet-enhance-wrapper')) {
                        return NodeFilter.FILTER_REJECT;
                    }
                    // 跳过 script 和 style
                    if (['SCRIPT', 'STYLE', 'TEXTAREA', 'INPUT'].includes(node.parentNode.tagName)) {
                        return NodeFilter.FILTER_REJECT;
                    }
                    // 检查是否包含磁力链接
                    if (CONFIG.keywords.some(kw => node.textContent.includes(kw))) {
                        return NodeFilter.FILTER_ACCEPT;
                    }
                    return NodeFilter.FILTER_REJECT;
                }
            }
        );

        const textNodes = [];
        while (walker.nextNode()) {
            textNodes.push(walker.currentNode);
        }

        textNodes.forEach(processTextNode);
    }

    // ==================== 初始化 ====================
    function init() {
        // 等待 DOM 加载完成
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', processPage);
        } else {
            // 延迟执行，确保页面渲染完成
            setTimeout(processPage, 500);
        }

        // 监听动态加载的内容（MutationObserver）
        const observer = new MutationObserver((mutations) => {
            let shouldProcess = false;
            mutations.forEach(mutation => {
                if (mutation.addedNodes.length > 0) {
                    shouldProcess = true;
                }
            });
            if (shouldProcess) {
                setTimeout(processPage, 300);
            }
        });

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

    // 启动
    init();
})();