// ==UserScript==
// @name         三合一：自动展开 + 滚动记忆 + 回顶/刷新/DeepSeek
// @namespace    https://github.com/merged-scripts
// @version      2.3.0
// @description  自动展开隐藏内容（常用网站）、记录滚动位置并恢复、回顶/刷新/DeepSeek按钮（半透明靠右，Via优化）
// @author       耗子Sky & airbash (整合优化)
// @match        *://*/*
// @run-at       document-start
// @grant        none
// @license      GPL-3.0
// ==/UserScript==

(function() {
    'use strict';

    // ==================== 用户配置区 ====================
    const CONFIG = {
        ENABLE_DEEPSEEK_BTN: true,   // 是否显示 DeepSeek 跳转按钮
        DEEPSEEK_URL: 'https://chat.deepseek.com/', // DeepSeek 目标地址
        SCROLL_THRESHOLD: 200,        // 滚动超过此值显示浮动按钮
    };

    // ==================== 公共工具函数 ====================
    const now = Date.now || function() { return new Date().getTime(); };

    // 节流函数
    function throttle(func, wait, options) {
        var timeout, context, args, result;
        var previous = 0;
        if (!options) options = {};

        var later = function() {
            previous = options.leading === false ? 0 : now();
            timeout = null;
            result = func.apply(context, args);
            if (!timeout) context = args = null;
        };

        var throttled = function() {
            var _now = now();
            if (!previous && options.leading === false) previous = _now;
            var remaining = wait - (_now - previous);
            context = this;
            args = arguments;
            if (remaining <= 0 || remaining > wait) {
                if (timeout) {
                    clearTimeout(timeout);
                    timeout = null;
                }
                previous = _now;
                result = func.apply(context, args);
                if (!timeout) context = args = null;
            } else if (!timeout && options.trailing !== false) {
                timeout = setTimeout(later, remaining);
            }
            return result;
        };

        throttled.cancel = function() {
            clearTimeout(timeout);
            previous = 0;
            timeout = context = args = null;
        };

        return throttled;
    }

    // 向页面注入样式（带 ID 去重）
    function addStyleOnce(css, id) {
        if (id && document.getElementById(id)) return;
        const style = document.createElement('style');
        if (id) style.id = id;
        style.textContent = css;
        document.head.appendChild(style);
        return style;
    }

    // 各功能专用样式注入（避免冲突）
    const addStyle_Scroll = (css) => addStyleOnce(css, 'scroll-memory-style');
    const addStyle_AutoUnfold = (css) => addStyleOnce(css, 'auto-unfold-style');
    const addStyle_Buttons = (css) => addStyleOnce(css, 'buttons-style');

    // 条件等待执行（轮询直到条件满足或超时）
    function runNeed(condition, fn, option = { count: 20, delay: 200, failFn: () => {} }, ...args) {
        if (typeof condition !== 'function' || typeof fn !== 'function') return;
        let ok = false;
        let count = 0;
        const maxCount = option.count || 20;
        const delay = option.delay || 200;
        const failFn = option.failFn || (() => {});
        function check() {
            if (condition.call(this, count + 1)) {
                fn.apply(this, args);
            } else if (++count < maxCount) {
                setTimeout(check, delay);
            } else {
                failFn();
            }
        }
        check();
    }

    // ==================== 功能1：自动展开隐藏内容（前置，精简优化） ====================
    (function() {
        // ---------- 站点规则定义 ----------
        // 精简后保留常用网站，合并相似规则，保证核心功能
        const websites = [
            {
                name: 'CSDN',
                match: /blog\.csdn\.net|ask\.csdn\.net|download\.csdn\.net|wenku\.csdn\.net/,
                handles: [
                    { type: 'click', selector: '.hide-preCode-bt' },
                    { type: 'display', selector: '.hide-article-box, .btn_mod, .readall_box, .expandBtn, .fl, .unfold-font, .el-button--text, .text-all' },
                    { type: 'height', selector: '.article_content, .normal-style' },
                    { type: 'click', selector: '.btn_comment_readmore, .ic_ask_down_reeow' }
                ]
            },
            {
                name: '简书',
                match: /jianshu\.com\/p/,
                handles: [
                    { type: 'display', selector: '.collapse-tips' },
                    { type: 'height', selector: '.collapse-free-content' },
                    { type: 'overflow', selector: 'body' }
                ],
                custom: () => {
                    addStyle_AutoUnfold('.collapse-free-content::after { height: 0 !important; }');
                }
            },
            {
                name: '知乎',
                match: /zhihu\.com\/question/,
                handles: [
                    { type: 'display', selector: '.ContentItem-rightButton' },
                    { type: 'height', selector: '.RichContent-inner--collapsed' }
                ],
                custom: () => {
                    addStyle_AutoUnfold(`
                        .RichContent--unescapable.is-collapsed .RichContent-inner { mask-image: unset !important; }
                        .RichContent.is-collapsed { cursor: unset !important; }
                    `);
                }
            },
            {
                name: '百度知道/经验/百科/贴吧/文库/百家号',
                match: /(zhidao|jingyan|baike|tieba|wk|tanbi|easylearn|baijiahao|mbd)\.baidu\.com/,
                handles: [
                    { type: 'display', selector: '.read-whole-mask, .w-detail-display-btn, .wgt-best-mask, .wgt-answers-mask, #show-hide-container, .show-answer-dispute, .replace_tip, .blur-bg, .continue-read-wrap, .shiti-answer .mask, .oPadding, .foldMaskWrapper, [class^=foldMaskWrapper-]' },
                    { type: 'height', selector: '.exp-content-container, .w-detail-container, .best-text, .answer-text, .replace_div, .reader-copy, .shiti-answer .analysis-text, .question-cont .tigan, .mainContent, #mainContentContainer, #dynamicItem' },
                    { type: 'click', selector: '.more-img-opt, .layout-icons_down-arrow, .j_lzl_m' },
                    { type: 'classList', selector: '.answer', remove: 'answer-hide answer-dispute-hide' }
                ],
                custom: () => {
                    // 百度百科加载更多
                    const btn = document.querySelector('.yx-load-more-inner');
                    if (btn) btn.dispatchEvent(new Event('tap'));
                    // 百度文库边距修复
                    const foldPager = document.querySelector('.fold-pager');
                    if (foldPager) foldPager.style.marginTop = '0';
                    const readView = document.querySelector('#read-view');
                    if (readView) readView.setAttribute('scrolling', 'yes');
                }
            },
            {
                name: '新浪/网易/搜狐/腾讯/凤凰/澎湃新闻',
                match: /(sina\.cn|3g\.163\.com|sohu\.com\/a|view\.inews\.qq\.com|ifeng\.com|thepaper\.cn)/,
                handles: [
                    { type: 'display', selector: '.look_more, .show_article, .lookall-box, [class^=show-more_outer__], [class^=show-more-article_cover__], [class^=index_more_], [class^=index_tip_], .showall, #clickForMore' },
                    { type: 'height', selector: '.s_card, article, #mp-editor, [class^=show-more_height-not-full__], [class^=index_main_content_], .article, .newsdetail_body' }
                ],
                custom: () => {
                    // 搜狐特殊处理
                    const artLookAll = document.querySelector('#artLookAll');
                    if (artLookAll) artLookAll.click();
                }
            },
            {
                name: '今日头条/东方资讯/丁香园',
                match: /(toutiao\.com\/article|mini\.eastday\.com|dxy\.cn)/,
                handles: [
                    { type: 'display', selector: '.toggle-button-container, .content-shadow, .Unfolded-btn, [class^=contentWrapBottom___], .show-all' },
                    { type: 'height', selector: '.content, .article-content, .dicussion-text, [class^=contentWrap___], .article__content' }
                ]
            },
            {
                name: 'B站专栏/动态',
                match: /bilibili\.com\/(opus|space)/,
                handles: [
                    { type: 'display', selector: '.opus-read-more' },
                    { type: 'classList', selector: '.opus-module-content', remove: 'limit show-read-text' }
                ],
                custom: () => {
                    document.querySelectorAll('.folded').forEach(el => el.className = 'bili-rich-text__content');
                    document.querySelectorAll('.bili-rich-text__action').forEach(el => el.innerText = '收起');
                }
            },
            {
                name: '微博/豆瓣',
                match: /weibo\.com\/ttarticle|douban\.com/,
                handles: [
                    { type: 'height', selector: '.WB_editor_iframe_new, .note-content' },
                    { type: 'display', selector: '.btn_line, .oia-readall' }
                ],
                custom: () => {
                    // 豆瓣简介展开
                    const introP = document.querySelector('.subject-intro p');
                    if (introP) {
                        const data = introP.getAttribute('data-content');
                        if (data) introP.innerText = data;
                    }
                    // 豆瓣评论展开
                    document.querySelectorAll('.LinesEllipsis-readmore, .expand, .a_show_full, .fold-switch')
                        .forEach(el => el.click());
                }
            },
            {
                name: '云开发者社区（阿里/腾讯/华为）',
                match: /developer\.aliyun\.com|cloud\.tencent\.com|huaweicloud\.csdn\.net/,
                handles: [
                    { type: 'height', selector: '.article-hide-content, .com-markdown-collpase-main, .cdc-expand-area__main, .user-article' },
                    { type: 'display', selector: '.article-hide-box, .com-markdown-collpase-toggle, .cdc-expand-area__toggle, .article-show-more' }
                ]
            },
            {
                name: '汽车之家/太平洋电脑/中关村在线/游民星空',
                match: /autohome\.com\.cn|pconline\.com\.cn|zol\.com\.cn|gamersky\.com/,
                handles: [
                    { type: 'display', selector: '#continue_reading, #continue_reading_new, .show_article, .unfold-article-btn, .gsAreaContextOpen' },
                    { type: 'height', selector: '#topicContentSection, .art-content, .article-content, #gsAreaContext' },
                    { type: 'classList', selector: '.fn-hide', remove: 'fn-hide' }
                ]
            },
            {
                name: '东方财富/喜马拉雅/代码随想录',
                match: /eastmoney\.com|m\.ximalaya\.com|programmercarl\.com/,
                handles: [
                    { type: 'display', selector: '.fold-btn, .fold-arrow, .fold-mask, .my_ad_wrap, #foldup_box, #read-more-wrap' },
                    { type: 'height', selector: '#articleContent, #text-content, #content, .stretch-box, #container' }
                ],
                custom: () => {
                    // 喜马拉雅移除展开按钮
                    const stretchMore = document.querySelector('.stretch-more');
                    if (stretchMore?.parentElement) stretchMore.parentElement.remove();
                }
            }
        ];

        // ---------- 核心展开逻辑 ----------
        let unfoldTimer = null;
        let unfoldAttempts = 0;
        const MAX_ATTEMPTS = 30;

        // 执行单次展开
        function performUnfold() {
            const url = location.href;
            for (const site of websites) {
                if (!site.match.test(url)) continue;

                // 执行自定义函数
                if (site.custom) {
                    try { site.custom(); } catch(e) {}
                }

                if (!site.handles) continue;

                for (const handle of site.handles) {
                    const elements = document.querySelectorAll(handle.selector);
                    elements.forEach(el => {
                        switch (handle.type) {
                            case 'display':
                                el.style.display = 'none';
                                break;
                            case 'height':
                                el.style.setProperty('height', 'auto', 'important');
                                el.style.setProperty('max-height', 'none', 'important');
                                break;
                            case 'overflow':
                                el.style.setProperty('overflow', 'visible', 'important');
                                break;
                            case 'classList':
                                if (handle.remove) {
                                    handle.remove.split(' ').forEach(cls => el.classList.remove(cls));
                                }
                                break;
                            case 'click':
                                if (el && el.getAttribute('data-unfolded') !== '1') {
                                    el.click();
                                    el.setAttribute('data-unfolded', '1');
                                }
                                break;
                        }
                    });
                }
            }
        }

        // 使用 requestAnimationFrame 轮询展开（优化性能）
        function scheduleUnfold() {
            if (unfoldAttempts > MAX_ATTEMPTS) return;
            performUnfold();
            unfoldAttempts++;
            unfoldTimer = requestAnimationFrame(scheduleUnfold);
        }

        // 启动展开
        function startUnfold() {
            scheduleUnfold();
            // 页面完全加载后额外执行几次确保动态内容
            window.addEventListener('load', () => {
                performUnfold();
                setTimeout(performUnfold, 300);
                setTimeout(performUnfold, 800);
            });
        }

        // 监听 SPA 页面 URL 变化重新展开
        let lastUrl = location.href;
        const urlObserver = new MutationObserver(() => {
            if (location.href !== lastUrl) {
                lastUrl = location.href;
                unfoldAttempts = 0; // 重置计数
                performUnfold();
            }
        });
        urlObserver.observe(document, { subtree: true, childList: true });

        // 启动
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', startUnfold);
        } else {
            startUnfold();
        }
    })();

    // ==================== 功能2：记录页面滚动位置 ====================
    (function() {
        const STORAGE_KEY = 'lemonScrollBox_v3';
        let currentBoxObj = {};

        // 获取元素的 XPath（简化版）
        function getXPath(element) {
            if (!element || element.nodeType !== 1) return '';
            if (element.id) return `//*[@id="${element.id}"]`;
            let paths = [];
            for (; element && element.nodeType === 1; element = element.parentNode) {
                let index = 0;
                for (let sibling = element.previousSibling; sibling; sibling = sibling.previousSibling) {
                    if (sibling.nodeType === 1 && sibling.nodeName === element.nodeName) index++;
                }
                const tagName = element.nodeName.toLowerCase();
                const pathIndex = index ? `[${index + 1}]` : '';
                paths.unshift(`${tagName}${pathIndex}`);
            }
            return '/' + paths.join('/');
        }

        function getScrollContainer() {
            return document.scrollingElement || document.documentElement;
        }

        function saveScrollPosition() {
            try {
                const container = getScrollContainer();
                if (!container) return;
                const url = location.href;
                const xpath = getXPath(container);
                currentBoxObj[url] = {
                    xpath: xpath,
                    pos: container.scrollTop,
                    id: container.id || '',
                    className: container.className || ''
                };
                localStorage.setItem(STORAGE_KEY, JSON.stringify(currentBoxObj));
            } catch(e) {}
        }

        function restoreScrollPosition() {
            try {
                const saved = localStorage.getItem(STORAGE_KEY);
                if (!saved) return;
                currentBoxObj = JSON.parse(saved);
                const url = location.href;
                const data = currentBoxObj[url];
                if (!data) return;

                runNeed(
                    () => {
                        let container = getScrollContainer();
                        if (data.xpath && data.xpath !== '/html') {
                            try {
                                const result = document.evaluate(data.xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
                                if (result.singleNodeValue) container = result.singleNodeValue;
                            } catch(e) {}
                        }
                        return container && container.scrollHeight > window.innerHeight;
                    },
                    () => {
                        let container = getScrollContainer();
                        try {
                            const result = document.evaluate(data.xpath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
                            if (result.singleNodeValue) container = result.singleNodeValue;
                        } catch(e) {}
                        if (container) {
                            setTimeout(() => { container.scrollTop = data.pos; }, 100);
                        }
                    },
                    { count: 10, delay: 300 }
                );
            } catch(e) {}
        }

        function initScrollMemory() {
            if (!localStorage.getItem(STORAGE_KEY)) {
                localStorage.setItem(STORAGE_KEY, '{}');
                currentBoxObj = {};
            } else {
                try { currentBoxObj = JSON.parse(localStorage.getItem(STORAGE_KEY)) || {}; } catch(e) { currentBoxObj = {}; }
            }

            const throttledSave = throttle(saveScrollPosition, 500);
            document.addEventListener('scroll', throttledSave, { passive: true });

            if (document.readyState === 'loading') {
                document.addEventListener('DOMContentLoaded', restoreScrollPosition);
            } else {
                restoreScrollPosition();
            }

            // 监听 URL 变化（SPA）
            let lastUrl = location.href;
            const observer = new MutationObserver(() => {
                if (location.href !== lastUrl) {
                    lastUrl = location.href;
                    restoreScrollPosition();
                }
            });
            observer.observe(document, { subtree: true, childList: true });
            window.addEventListener('popstate', restoreScrollPosition);
        }

        initScrollMemory();
    })();

    // ==================== 功能3：浮动按钮（回顶/刷新/DeepSeek） ====================
    (function() {
        const TOP_BTN_ID = 'merged-back-top-btn';
        const REFRESH_BTN_ID = 'merged-refresh-btn';
        const DEEPSEEK_BTN_ID = 'merged-deepseek-btn';

        // 注入样式（按钮尺寸33px，右距6px，垂直间距22px）
        const buttonStyles = `
            #${TOP_BTN_ID}, #${REFRESH_BTN_ID}, #${DEEPSEEK_BTN_ID} {
                position: fixed;
                right: 6px;
                width: 33px;
                height: 33px;
                border-radius: 50%;
                background-color: rgba(60, 60, 60, 0.5);
                backdrop-filter: blur(4px);
                -webkit-backdrop-filter: blur(4px);
                box-shadow: 0 2px 8px rgba(0,0,0,0.15);
                display: flex;
                align-items: center;
                justify-content: center;
                cursor: pointer;
                z-index: 9999;
                opacity: 0;
                transform: scale(0.8);
                transition: opacity 0.25s ease, transform 0.2s ease;
                pointer-events: none;
                border: 1px solid rgba(255,255,255,0.2);
            }
            #${TOP_BTN_ID} {
                top: 66.6vh;
            }
            #${REFRESH_BTN_ID} {
                top: calc(66.6vh + 33px + 22px);
            }
            #${DEEPSEEK_BTN_ID} {
                top: calc(66.6vh + 33px + 22px + 33px + 22px);
            }
            #${TOP_BTN_ID}.visible, #${REFRESH_BTN_ID}.visible, #${DEEPSEEK_BTN_ID}.visible {
                opacity: 1;
                transform: scale(1);
                pointer-events: auto;
            }
            /* 回顶箭头 */
            #${TOP_BTN_ID}::before {
                content: '';
                width: 10px;
                height: 10px;
                border-left: 2.2px solid white;
                border-bottom: 2.2px solid white;
                transform: rotate(135deg);
                margin-top: 4px;
            }
            /* 刷新图标（旋转环+箭头） */
            #${REFRESH_BTN_ID}::before {
                content: '';
                width: 14px;
                height: 14px;
                border: 2.2px solid white;
                border-right-color: transparent;
                border-radius: 50%;
                transform: rotate(-45deg);
                margin-top: 2px;
            }
            #${REFRESH_BTN_ID}::after {
                content: '';
                position: absolute;
                width: 0;
                height: 0;
                border-left: 5px solid transparent;
                border-right: 5px solid transparent;
                border-bottom: 6px solid white;
                transform: rotate(135deg) translate(8px, -2px);
                opacity: 0.9;
            }
            /* DeepSeek 按钮（DS 字母） */
            #${DEEPSEEK_BTN_ID} {
                font-weight: 600;
                font-size: 16px;
                color: white;
                font-family: Arial, sans-serif;
            }
            #${DEEPSEEK_BTN_ID}::before {
                content: 'DS';
                line-height: 1;
                text-shadow: 0 1px 2px rgba(0,0,0,0.2);
            }
            #${TOP_BTN_ID}:active, #${REFRESH_BTN_ID}:active, #${DEEPSEEK_BTN_ID}:active {
                background-color: rgba(80, 80, 80, 0.6);
                transform: scale(0.9);
            }
            @media (prefers-color-scheme: dark) {
                #${TOP_BTN_ID}, #${REFRESH_BTN_ID}, #${DEEPSEEK_BTN_ID} {
                    background-color: rgba(220, 220, 220, 0.2);
                    border-color: rgba(255,255,255,0.1);
                }
                #${TOP_BTN_ID}:active, #${REFRESH_BTN_ID}:active, #${DEEPSEEK_BTN_ID}:active {
                    background-color: rgba(255, 255, 255, 0.25);
                }
            }
        `;
        addStyle_Buttons(buttonStyles);

        // 创建按钮
        const topBtn = document.createElement('div');
        topBtn.id = TOP_BTN_ID;
        topBtn.setAttribute('aria-label', '回到顶部');
        document.body.appendChild(topBtn);

        const refreshBtn = document.createElement('div');
        refreshBtn.id = REFRESH_BTN_ID;
        refreshBtn.setAttribute('aria-label', '刷新页面');
        document.body.appendChild(refreshBtn);

        let deepseekBtn = null;
        if (CONFIG.ENABLE_DEEPSEEK_BTN) {
            deepseekBtn = document.createElement('div');
            deepseekBtn.id = DEEPSEEK_BTN_ID;
            deepseekBtn.setAttribute('aria-label', '跳转到 DeepSeek');
            document.body.appendChild(deepseekBtn);
        }

        // 显示/隐藏控制（requestAnimationFrame 防抖）
        let ticking = false;
        function updateButtonsVisibility() {
            const scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
            const shouldShow = scrollTop > CONFIG.SCROLL_THRESHOLD;
            const action = shouldShow ? 'add' : 'remove';
            topBtn.classList[action]('visible');
            refreshBtn.classList[action]('visible');
            if (deepseekBtn) deepseekBtn.classList[action]('visible');
            ticking = false;
        }

        function onScroll() {
            if (!ticking) {
                requestAnimationFrame(updateButtonsVisibility);
                ticking = true;
            }
        }

        window.addEventListener('scroll', onScroll, { passive: true });

        // 绑定事件
        topBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            window.scrollTo({ top: 0, behavior: 'smooth' });
        });

        refreshBtn.addEventListener('click', (e) => {
            e.stopPropagation();
            location.reload();
        });

        if (deepseekBtn) {
            deepseekBtn.addEventListener('click', (e) => {
                e.stopPropagation();
                window.location.href = CONFIG.DEEPSEEK_URL;
            });
        }

        // 初始化检查
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', updateButtonsVisibility);
        } else {
            updateButtonsVisibility();
        }

        // SPA 路由变化时重新检查
        let lastUrl = location.href;
        const observer = new MutationObserver(() => {
            if (location.href !== lastUrl) {
                lastUrl = location.href;
                setTimeout(updateButtonsVisibility, 100);
            }
        });
        observer.observe(document, { subtree: true, childList: true });
    })();

})();