// ==UserScript==
// @name         简化版超级链接获取器（支持拖拽和折叠）
// @namespace    http://tampermonkey.net/
// @version      3.3
// @description  右键点击时智能获取链接并显示在可拖拽的框中，可编辑链接并跳转，支持折叠展开
// @match        https://linux.do/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    GM_addStyle(`
        #super-link-status {
            position: fixed;
            top: 10px;
            right: 10px;
            z-index: 10000;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 5px;
            border-radius: 50%;
            font-size: 12px;
            display: flex;
            align-items: center;
            cursor: move;
            transition: all 0.3s ease;
        }
        #super-link-status.expanded {
            border-radius: 4px;
            padding: 5px 10px;
        }
        #super-link-status input {
            width: 0;
            padding: 0;
            border: none;
            background: transparent;
            color: white;
            transition: all 0.3s ease;
        }
        #super-link-status.expanded input {
            width: 300px;
            margin-right: 5px;
            padding: 2px 5px;
            border: 1px solid #ccc;
            background: white;
            color: black;
        }
        #super-link-status button {
            display: none;
            padding: 2px 5px;
            background: #28a745;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        #super-link-status.expanded button {
            display: inline-block;
        }
        #toggle-button {
            width: 30px;
            height: 30px;
            background: #28a745;
            border: none;
            border-radius: 50%;
            color: white;
            font-size: 20px;
            cursor: pointer;
            outline: none;
        }
    `);

    // 创建状态显示框
    const statusBox = document.createElement('div');
    statusBox.id = 'super-link-status';
    statusBox.innerHTML = `
        <button id="toggle-button">+</button>
        <input type="text" id="super-link-edit" placeholder="右键点击获取链接...">
        <button id="super-jump-button">跳转</button>
    `;
    document.body.appendChild(statusBox);

    const toggleButton = document.getElementById('toggle-button');
    const linkEdit = document.getElementById('super-link-edit');
    const jumpButton = document.getElementById('super-jump-button');

    toggleButton.addEventListener('click', function() {
        statusBox.classList.toggle('expanded');
        toggleButton.textContent = statusBox.classList.contains('expanded') ? '-' : '+';
    });

    // 添加拖拽功能
    let isDragging = false;
    let dragOffsetX, dragOffsetY;

    statusBox.addEventListener('mousedown', function(e) {
        if (e.target === statusBox || e.target === toggleButton) {
            isDragging = true;
            dragOffsetX = e.clientX - statusBox.getBoundingClientRect().left;
            dragOffsetY = e.clientY - statusBox.getBoundingClientRect().top;
        }
    });

    document.addEventListener('mousemove', function(e) {
        if (isDragging) {
            statusBox.style.left = (e.clientX - dragOffsetX) + 'px';
            statusBox.style.top = (e.clientY - dragOffsetY) + 'px';
            statusBox.style.right = 'auto';
        }
    });

    document.addEventListener('mouseup', function() {
        isDragging = false;
    });

    // 超级链接检测函数
    function superDetectLink(element) {
        // 检查href属性
        if (element.href) {
            return element.href;
        }

        // 检查所有可能包含链接的属性
        const potentialAttributes = ['src', 'data-href', 'data-url', 'data-link'];
        for (let attr of potentialAttributes) {
            if (element.hasAttribute(attr)) {
                const value = element.getAttribute(attr);
                if (value && value.match(/^(https?:\/\/|\/)/)) {
                    return value;
                }
            }
        }

        // 检查所有data-*属性
        for (let attr of element.attributes) {
            if (attr.name.startsWith('data-') && attr.value.match(/^(https?:\/\/|\/)/)) {
                return attr.value;
            }
        }

        // 检查onclick属性
        const onclickAttr = element.getAttribute('onclick');
        if (onclickAttr) {
            const match = onclickAttr.match(/['"]((https?:\/\/|\/)[^'"]+)['"]/);
            if (match) {
                return match[1];
            }
        }

        // 检查内部文本是否包含URL
        const text = element.textContent;
        const urlMatch = text.match(/https?:\/\/[^\s]+/);
        if (urlMatch) {
            return urlMatch[0];
        }

        return null;
    }

    // 递归搜索链接
    function recursivelySearchForLink(element) {
        const link = superDetectLink(element);
        if (link) {
            return link;
        }

        for (let child of element.children) {
            const childLink = recursivelySearchForLink(child);
            if (childLink) {
                return childLink;
            }
        }

        return null;
    }

    // 右键点击事件处理函数
    document.addEventListener('contextmenu', function(e) {
        e.preventDefault(); // 禁用默认右键菜单

        const clickedElement = document.elementFromPoint(e.clientX, e.clientY);
        let content = '';
        
        if (clickedElement) {
            content = recursivelySearchForLink(clickedElement) || '';
        }

        if (!content) {
            content = `在 (${e.pageX}, ${e.pageY}) 处没有找到链接`;
        } else if (!content.endsWith('/activity/topics')) {
            content += '/activity/topics';
        }

        linkEdit.value = content;
        if (!statusBox.classList.contains('expanded')) {
            statusBox.classList.add('expanded');
            toggleButton.textContent = '-';
        }
    });

    // 跳转按钮功能
    jumpButton.addEventListener('click', function() {
        const url = linkEdit.value.trim();
        if (url) {
            window.open(url, '_blank');
        } else {
            alert('请输入有效的链接！');
        }
    });
})();