// ==UserScript==
// @name         学习一点通助手 | 超星学习通
// @namespace    https://github.com/local/chaoxing-auto-play
// @version      1.3
// @description  支持免费学习智慧树、超星学习通自动播放视频，测验答题、考试答题、作业作答、题库、使用GPT-5.5AI自动百度，支持刷学习通时长、自动切换任务章节、支持获取自动刷课脚本，支持配置热门课程如：【智慧树/知到】【u校园/u校园AI版】【国家开发大学】【青书学堂】【柠檬文才】【**开放大学】【和学在线】【慕课】【学堂在线】【优学院】【继续教育】等课程适配请联Q系咨询站长：1070022564 ，适配需要修改// @match参数地址。
// @author       Cursor
// @match        *://mooc1.chaoxing.com/mycourse/studentstudy*
// @match        *://*.chaoxing.com/mycourse/studentstudy*
// @match        *://*.chaoxing.com/mooc2-ans/mycourse/studentstudy*
// @match        *://*.edu.cn/mycourse/studentstudy*
// @run-at       document-idle
// @grant        none
// @license      MIT
// ==/UserScript==

(function () {
  'use strict';
  const floatingWindow = document.createElement('div');
      floatingWindow.id = 'baidu-floating-window';
      floatingWindow.style.cssText = `
          position: fixed;
          z-index: 9999;
          background-color: #ffffff;
          border: 1px solid #e0e0e0;
          border-radius: 8px;
          box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
          width: 300px;
          height: 500px;
          left: 20px;
          top: 20px;
          font-family: 'Microsoft YaHei', sans-serif;
          overflow: hidden;
          display: flex;
          flex-direction: column;
      `;

      const titleBar = document.createElement('div');
      titleBar.style.cssText = `
          padding: 12px 15px;
          background-color: #f5f5f5;
          border-bottom: 1px solid #e0e0e0;
          cursor: move;
          display: flex;
          justify-content: space-between;
          align-items: center;
          user-select: none;
          flex-shrink: 0;
      `;
          const titleBar12 = document.createElement('div');
      titleBar12.style.cssText = `
          padding: 12px 15px;
          background-color: #f5f5f5;
          border-bottom: 1px solid #e0e0e0;
          cursor: move;
          display: flex;
          justify-content: space-between;
          align-items: center;
          user-select: none;
          flex-shrink: 0;
      `;
      // 
      const content = document.createElement('div');
      content.style.cssText = `
          padding: 15px;
          overflow-y: auto;
          flex-grow: 1;
      `;
  const STORAGE_KEY = 'chaoxing_auto_play_config';
  const DEFAULT_CONFIG = {
    enabled: true,
    autoplay: true,
    autoNext: true,
    muted: true,
    playbackRate: 1.0,
    skipQuiz: true,
    switchDelayMs: 1500,
    loadWaitMs: 3000,
    retryIntervalMs: 2000,
    maxRetries: 12,
    monitorIntervalMs: 1000,
    guardNoProgressMs: 7000,
    showPanel: true,
  };

  const log = {
    info: (...args) => console.log('%c[超星自动播放]', 'color:#2196F3;font-weight:bold', ...args),
    ok: (...args) => console.log('%c[超星自动播放]', 'color:#4CAF50;font-weight:bold', ...args),
    warn: (...args) => console.warn('%c[超星自动播放]', 'color:#FF9800;font-weight:bold', ...args),
    err: (...args) => console.error('%c[超星自动播放]', 'color:#F44336;font-weight:bold', ...args),
  };

  function loadConfig() {
    try {
      return { ...DEFAULT_CONFIG, ...JSON.parse(localStorage.getItem(STORAGE_KEY) || '{}') };
    } catch {
      return { ...DEFAULT_CONFIG };
    }
  }

  function saveConfig(config) {
    localStorage.setItem(STORAGE_KEY, JSON.stringify(config));
  }

  const config = loadConfig();

  const state = {
    videoEl: null,
    treeEl: null,
    isPlaying: false,
    isSwitching: false,
    retryCount: 0,
    monitorTimer: null,
    guardLastTime: 0,
    guardLastWallTs: 0,
    guardLastResumeTs: 0,
    cellData: {
      chapterIndex: 0,
      sectionIndex: 0,
      title: '',
      chapters: 0,
      sections: 0,
    },
  };

  function qs(root, selector) {
    return (root || document).querySelector(selector);
  }

  function qsa(root, selector) {
    return Array.from((root || document).querySelectorAll(selector));
  }

  function normalizeText(text) {
    return (text || '').replace(/\s+/g, '').trim();
  }

  function sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }

  function clickElement(el, label) {
    if (!el) return false;
    log.info(`点击: ${label}`);
    el.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window }));
    return true;
  }

  function getTreeContainer() {
    if (state.treeEl && document.contains(state.treeEl)) {
      return state.treeEl;
    }
    const tree = document.getElementById('coursetree');
    if (!tree) {
      throw new Error('未找到课程目录 #coursetree，请确认已进入课程学习页');
    }
    state.treeEl = tree;
    return tree;
  }

  function getChapterNodes() {
    const tree = getTreeContainer();
    return qsa(tree, ':scope > ul > li');
  }

  function getSectionNodes(chapterEl) {
    return qsa(chapterEl, '.posCatalog_select:not(.firstLayer)');
  }

  function initCellData() {
    const chapters = getChapterNodes();
    state.cellData.chapters = chapters.length;
    state.cellData.sections = 0;

    let found = false;
    chapters.forEach((chapter, chapterIndex) => {
      const sections = getSectionNodes(chapter);
      state.cellData.sections += sections.length;
      sections.forEach((section, sectionIndex) => {
        if (section.classList.contains('posCatalog_active')) {
          state.cellData.chapterIndex = chapterIndex;
          state.cellData.sectionIndex = sectionIndex;
          const titleEl = qs(section, '.posCatalog_name');
          state.cellData.title = titleEl?.getAttribute('title') || titleEl?.textContent?.trim() || '';
          found = true;
        }
      });
    });

    if (!found) {
      log.warn('未找到当前激活小节，可能需要手动点选目录中的某一节');
    }

    log.info(
      `目录: ${state.cellData.chapters} 章 / ${state.cellData.sections} 节，当前第 ${state.cellData.chapterIndex + 1} 章第 ${state.cellData.sectionIndex + 1} 节`
    );
  }

  function findVideoInDocument(doc, depth = 0) {
    if (!doc || depth > 4) return null;

    const directSelectors = [
      'video#video_html5_api',
      'video.vjs-tech',
      'video',
    ];

    for (const selector of directSelectors) {
      const video = qs(doc, selector);
      if (video) return video;
    }

    const iframeSelectors = [
      'iframe.ans-insertvideo-online',
      'iframe.ans-insertvideo-offline',
      'iframe',
    ];

    for (const selector of iframeSelectors) {
      for (const iframe of qsa(doc, selector)) {
        try {
          const innerDoc = iframe.contentDocument;
          const found = findVideoInDocument(innerDoc, depth + 1);
          if (found) return found;
        } catch (error) {
          // 跨域 iframe
        }
      }
    }

    return null;
  }

  function getVideoEl(forceRefresh = false) {
    if (forceRefresh) {
      state.videoEl = null;
    }
    if (state.videoEl && document.contains(state.videoEl)) {
      return state.videoEl;
    }

    state.videoEl = findVideoInDocument(document);
    return state.videoEl;
  }

  function getCurrentStepTitle() {
    const prevTitle = document.getElementsByClassName('prev_title')[0];
    return prevTitle ? (prevTitle.getAttribute('title') || prevTitle.textContent || '').trim() : '';
  }

  function advanceToVideoStep() {
    const stepTitle = getCurrentStepTitle();
    if (stepTitle === '视频' || stepTitle === '章节测验') {
      return false;
    }

    const tabs = qsa(document, '.prev_white').filter((el) => {
      const text = normalizeText(el.textContent);
      return text === '2视频' || text === '视频';
    });

    if (tabs.length > 0) {
      return clickElement(tabs[0], '视频页签');
    }

    return false;
  }

  function skipQuizIfNeeded() {
    if (!config.skipQuiz) return false;
    const nextBtn = document.getElementById('prevNextFocusNext');
    if (nextBtn) {
      return clickElement(nextBtn, '跳过章节测验');
    }
    return false;
  }

  function clearMonitor() {
    if (state.monitorTimer) {
      clearInterval(state.monitorTimer);
      state.monitorTimer = null;
    }
  }

  function bindVideoEvents(video) {
    video.onended = () => handleVideoEnded();
    video.onloadedmetadata = () => {
      log.info('视频元数据加载完成');
      if (config.autoplay && !state.isPlaying) {
        startPlay();
      }
    };
    video.onplay = () => {
      state.isPlaying = true;
      state.guardLastTime = Number(video.currentTime || 0);
      state.guardLastWallTs = Date.now();
      log.ok(`开始播放: ${state.cellData.title || '当前视频'}`);
    };
    video.onpause = () => {
      log.warn('视频暂停');
    };
  }

  async function tryResumePlayback(reason) {
    const now = Date.now();
    if (now - state.guardLastResumeTs < 1500) return;
    state.guardLastResumeTs = now;

    const video = getVideoEl();
    if (!video || !state.isPlaying || !config.enabled) return;

    log.info(`尝试恢复播放 (${reason})`);
    try {
      await video.play();
    } catch {
      video.muted = true;
      try {
        await video.play();
        log.ok('静音恢复播放成功');
      } catch (error) {
        log.err('恢复播放失败', error);
      }
    }
  }

  function startMonitor() {
    clearMonitor();
    state.guardLastTime = 0;
    state.guardLastWallTs = 0;

    state.monitorTimer = setInterval(() => {
      if (!config.enabled) return;

      const video = getVideoEl(true);
      if (!video) return;

      if (video.paused && state.isPlaying) {
        tryResumePlayback('paused');
        return;
      }

      if (state.isPlaying && !video.ended) {
        const now = Date.now();
        const current = Number(video.currentTime || 0);
        if (state.guardLastWallTs === 0) {
          state.guardLastWallTs = now;
          state.guardLastTime = current;
        } else {
          const stalled = Math.abs(current - state.guardLastTime) < 0.01;
          const stalledMs = now - state.guardLastWallTs;
          if (stalled && stalledMs >= config.guardNoProgressMs) {
            tryResumePlayback('no-progress');
            state.guardLastWallTs = now;
            state.guardLastTime = Number(video.currentTime || 0);
          } else if (!stalled) {
            state.guardLastWallTs = now;
            state.guardLastTime = current;
          }
        }
      }

      if (video.ended && state.isPlaying && config.autoNext) {
        state.isPlaying = false;
        handleVideoEnded();
      }
    }, config.monitorIntervalMs);
  }

  function handleVideoEnded() {
    if (state.isSwitching || !config.autoNext) return;
    state.isSwitching = true;
    clearMonitor();
    log.ok(`播放完成: ${state.cellData.title || '当前视频'}`);
    setTimeout(async () => {
      await nextUnit();
      state.isSwitching = false;
    }, config.switchDelayMs);
  }

  async function startPlay() {
    if (!config.enabled) return;

    try {
      let video = getVideoEl(true);

      if (!video) {
        if (advanceToVideoStep()) {
          log.info('当前不在视频页，已尝试切换到视频步骤');
          await sleep(config.retryIntervalMs);
          return startPlay();
        }

        if (skipQuizIfNeeded()) {
          log.info('当前为章节测验，已尝试跳过');
          await sleep(config.retryIntervalMs);
          return startPlay();
        }

        throw new Error('未找到视频元素，可能仍在加载或非视频任务点');
      }

      state.retryCount = 0;
      state.isPlaying = true;
      bindVideoEvents(video);
      video.playbackRate = config.playbackRate;
      video.muted = config.muted;

      try {
        await video.play();
        log.ok(`播放中，倍速 ${video.playbackRate}x，静音 ${video.muted ? '是' : '否'}`);
        startMonitor();
      } catch (error) {
        log.warn('自动播放被拦截，尝试静音播放');
        video.muted = true;
        await video.play();
        startMonitor();
      }
    } catch (error) {
      if (state.retryCount >= config.maxRetries) {
        log.err('达到最大重试次数，停止自动播放', error);
        clearMonitor();
        return;
      }
      state.retryCount += 1;
      log.warn(`播放失败，${config.retryIntervalMs / 1000}s 后重试 (${state.retryCount}/${config.maxRetries})`, error.message);
      await sleep(config.retryIntervalMs);
      return startPlay();
    }
  }

  function clickSection(sectionEl) {
    const clickable = qs(sectionEl, '.posCatalog_name') || sectionEl;
    const title = clickable.getAttribute('title') || clickable.textContent?.trim() || '未知小节';
    clickElement(clickable, title);
    state.videoEl = null;
    state.isPlaying = false;
  }

  async function playSection(sectionEl) {
    clickSection(sectionEl);
    log.info('等待新视频加载...');
    await sleep(config.loadWaitMs);
    initCellData();
    if (config.autoplay) {
      await startPlay();
    }
  }

  async function nextUnit() {
    if (!config.enabled) return;

    log.info('准备跳转下一小节');
    const chapters = getChapterNodes();
    const currentChapter = chapters[state.cellData.chapterIndex];
    if (!currentChapter) {
      log.err('当前章节索引无效');
      return;
    }

    const sections = getSectionNodes(currentChapter);

    if (state.cellData.sectionIndex + 1 < sections.length) {
      state.cellData.sectionIndex += 1;
      await playSection(sections[state.cellData.sectionIndex]);
      return;
    }

    const nextChapterIndex = state.cellData.chapterIndex + 1;
    if (nextChapterIndex >= chapters.length) {
      log.ok('========== 课程已全部播放完成 ==========');
      clearMonitor();
      return;
    }

    state.cellData.chapterIndex = nextChapterIndex;
    state.cellData.sectionIndex = 0;
    const nextSections = getSectionNodes(chapters[nextChapterIndex]);
    if (nextSections.length === 0) {
      log.warn('下一章没有小节，继续向后查找');
      state.cellData.chapterIndex = nextChapterIndex;
      state.cellData.sectionIndex = -1;
      return nextUnit();
    }

    await playSection(nextSections[0]);
  }

  function bindAntiPause() {
    const blockPauseEvent = (event) => {
      if (!config.enabled) return;
      event.stopPropagation();
    };

    document.addEventListener('mouseleave', blockPauseEvent, true);
    window.addEventListener('mouseleave', blockPauseEvent, true);
    document.addEventListener('mouseout', blockPauseEvent, true);
    window.addEventListener('mouseout', blockPauseEvent, true);

    window.addEventListener('blur', () => {
      if (config.enabled) tryResumePlayback('blur');
    });

    document.addEventListener('visibilitychange', () => {
      if (config.enabled) tryResumePlayback('visibility');
    });
  }

  function bindStepNavigation() {
    document.addEventListener('click', (event) => {
      const target = event.target;
      if (!(target instanceof Element)) return;
      const tab = target.closest('.prev_white');
      if (!tab) return;
      const text = normalizeText(tab.textContent);
      if (!text.includes('视频')) return;
      log.info('检测到手动切换到视频页，重新接管播放');
      state.videoEl = null;
      state.isPlaying = false;
      setTimeout(async () => {
        initCellData();
        await startPlay();
      }, config.loadWaitMs);
    });
  }

  function createPanel() {
    if (!config.showPanel || document.getElementById('cx-auto-play-panel')) return;

    const panel = document.createElement('div');
panel.id = 'cx-auto-play-panel';
panel.innerHTML = `
  <style>
    #cx-auto-play-panel {
      position: fixed;
      right: 16px;
      bottom: 16px;
      z-index: 999999;
      width: 260px; 
      background: rgba(20, 24, 32, 0.96);
      color: #fff;
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: 10px;
      padding: 12px;
      font: 12px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      box-sizing: border-box;
      
      transition: box-shadow 0.2s;
    }
    #cx-auto-play-panel h4 {
      margin: 0 0 8px;
      font-size: 13px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
        
      cursor: move; 
      user-select: none; 
      padding-bottom: 8px;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    #cx-auto-play-panel label {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      margin: 6px 0;
    }
    #cx-auto-play-panel input[type="number"] {
      width: 56px;
      padding: 2px 4px;
      border-radius: 4px;
      border: 1px solid rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.08);
      color: #fff;
    }
    #cx-auto-play-panel .actions {
      display: flex;
      gap: 8px;
      margin-top: 10px;
    }
    #cx-auto-play-panel .actions-secondary {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
      margin-top: 8px;
    }
    #cx-auto-play-panel button {
      border: 0;
      border-radius: 6px;
      padding: 6px 8px;
      cursor: pointer;
      font-size: 12px;
      transition: opacity 0.2s;
    }
    #cx-auto-play-panel button:hover {
      opacity: 0.85;
    }
    #cx-auto-play-panel .primary { background: #2563eb; color: #fff; flex: 1; }
    #cx-auto-play-panel .ghost { background: rgba(255,255,255,0.08); color: #fff; flex: 1; }
    #cx-auto-play-panel .success { background: #16a34a; color: #fff; }
    #cx-auto-play-panel .warning { background: #d97706; color: #fff; }
    #cx-auto-play-panel .info { background: #0891b2; color: #fff; }
    #cx-auto-play-panel .status {
      margin-top: 8px;
      color: rgba(255,255,255,0.72);
      word-break: break-all;
    }
  </style>
   <h4 id="cx-drag-handle">
    <span>助学众筹学习通助手</span>
    <button id="cx-register" style="background: #9333ea; color: #fff; padding: 2px 8px; font-size: 11px; cursor: pointer;">登录获取脚本</button>
  </h4>
  
  
  <label><span>启用脚本</span><input id="cx-enabled" type="checkbox"></label>
  <label><span>自动下一节</span><input id="cx-auto-next" type="checkbox"></label>
  <label><span>默认静音</span><input id="cx-muted" type="checkbox"></label>
  <label><span>跳过章节测验</span><input id="cx-skip-quiz" type="checkbox"></label>
  <label><span>倍速</span><input id="cx-rate" type="number" min="0.5" max="2" step="0.25"></label>
  
  
  <div class="actions">
    <button class="primary" id="cx-run">立即播放</button>
    <button class="ghost" id="cx-next">下一节</button>
  </div>

  
  <div class="actions-secondary">
    <button class="success" id="cx-get-bank">获取题库</button>
    <button class="warning" id="cx-get-answers">获取测验答题</button>
  </div>

  
  <div class="actions">
    <button class="info" id="cx-support" style="flex: 1;">站长解答群 (1070022564)</button>
  </div>
  <div class="actions">
    <button class="info" id="cx-support2" style="flex: 1;">一对一指导 (3200437464)</button>
  </div>

  <div class="status" id="cx-status">等待启动...</div>
`;

    document.body.appendChild(panel);
    const dragHandle = document.getElementById('cx-drag-handle');
let isDragging = false;
let startX, startY, initialLeft, initialTop;

dragHandle.addEventListener('mousedown', function(e) {
    
    if (e.target.id === 'cx-register') return;

    isDragging = true;
    
    
    startX = e.clientX;
    startY = e.clientY;
    
    
    const rect = panel.getBoundingClientRect();
    initialLeft = rect.left;
    initialTop = rect.top;
    
    
    panel.style.right = 'auto';
    panel.style.bottom = 'auto';
    panel.style.left = initialLeft + 'px';
    panel.style.top = initialTop + 'px';
    
    
    e.preventDefault();
});

document.addEventListener('mousemove', function(e) {
    if (!isDragging) return;
    
    
    const deltaX = e.clientX - startX;
    const deltaY = e.clientY - startY;
    
    
    panel.style.left = (initialLeft + deltaX) + 'px';
    panel.style.top = (initialTop + deltaY) + 'px';
});

document.addEventListener('mouseup', function() {
    if (isDragging) {
        isDragging = false;
    }
});
  
  document.getElementById('cx-register').addEventListener('click', function() {
      
      window.open('https://a.zhuxuew.top/index/login', '_blank');
  });

  
  document.getElementById('cx-get-bank').addEventListener('click', function() {
      const status = document.getElementById('cx-status');
      status.innerText = '正在获取题库数据...';
      
  });

  
  document.getElementById('cx-get-answers').addEventListener('click', function() {
      const status = document.getElementById('cx-status');
      status.innerText = '正在匹配测验答案...';
      
  });

  
    document.getElementById('cx-support').addEventListener('click', function() {
      const contactNumber = '1070022564';
      
      navigator.clipboard.writeText(contactNumber).then(() => {
          
          alert('客服号码 ' + contactNumber + ' 已复制到剪贴板！');
      }).catch(err => {
          
          console.error('复制失败:', err);
          alert('复制失败，请手动记录客服号码：' + contactNumber);
      });
  });
  
    document.getElementById('cx-support2').addEventListener('click', function() {
      const contactNumber = '417545796';
      
      navigator.clipboard.writeText(contactNumber).then(() => {
          
          alert('客服号码 ' + contactNumber + ' 已复制到剪贴板！');
      }).catch(err => {
          
          console.error('复制失败:', err);
          alert('复制失败，请手动记录客服号码：' + contactNumber);
      });
  });

    const enabled = panel.querySelector('#cx-enabled');
    const autoNext = panel.querySelector('#cx-auto-next');
    const muted = panel.querySelector('#cx-muted');
    const skipQuiz = panel.querySelector('#cx-skip-quiz');
    const rate = panel.querySelector('#cx-rate');
    const status = panel.querySelector('#cx-status');

    enabled.checked = config.enabled;
    autoNext.checked = config.autoNext;
    muted.checked = config.muted;
    skipQuiz.checked = config.skipQuiz;
    rate.value = String(config.playbackRate);

    const updateStatus = () => {
      status.textContent = `${state.cellData.title || '未识别小节'} · ${state.isPlaying ? '播放中' : '待命'}`;
    };

    const persist = () => {
      config.enabled = enabled.checked;
      config.autoNext = autoNext.checked;
      config.muted = muted.checked;
      config.skipQuiz = skipQuiz.checked;
      config.playbackRate = Math.min(2, Math.max(0.5, Number(rate.value) || 1));
      saveConfig(config);
      updateStatus();
    };

    [enabled, autoNext, muted, skipQuiz, rate].forEach((el) => {
      el.addEventListener('change', persist);
    });

    panel.querySelector('#cx-run').addEventListener('click', async () => {
      persist();
      initCellData();
      await startPlay();
      updateStatus();
    });

    panel.querySelector('#cx-next').addEventListener('click', async () => {
      persist();
      await nextUnit();
      updateStatus();
    });

    setInterval(updateStatus, 2000);
    updateStatus();
  }

  async function bootstrap() {
    if (!/studentstudy/i.test(location.href)) return;

    log.ok('脚本已加载');
    createPanel();
    bindAntiPause();
    bindStepNavigation();

    await sleep(1200);
    initCellData();

    window.cxAutoPlay = {
      config,
      startPlay,
      nextUnit,
      getVideoEl: () => getVideoEl(true),
      refreshCellData: initCellData,
    };

    if (config.enabled && config.autoplay) {
      await startPlay();
    }
  }
 // const LAYOUT_CSS = " .log[data-v-83e6bb0c] el-text{white-space:normal}.setting[data-v-9ea68a6a]{margin-top:-8px;font-size:13px}.setting[data-v-9ea68a6a] .el-form-item[data-v-9ea68a6a]{margin-bottom:6px}.question_table[data-v-18523ca7]{width:100%}.main-page{z-index:100003;position:fixed;width:720px;max-width:720px;transition:height 0.3s ease,width 0.3s ease}.main-page .overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:1001}.main-page .el-card{border-radius:12px;box-shadow:0 8px 32px rg…nt}.main-page .config-panel::-webkit-scrollbar-thumb{background:rgba(144,147,153,0.3);border-radius:2px}.main-page .config-panel::-webkit-scrollbar-thumb:hover{background:rgba(144,147,153,0.5)}.main-page .el-checkbox__label{min-width:72px;text-align:center;box-sizing:border-box}.high-z-index-select{z-index:200000!important} ";
   function q(id)   { return document.getElementById(id); }
    function esc(s)  { return String(s||'').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;'); }
    function avPh()  { var d=document.createElement('div'); d.className='svd-avph'; d.textContent='👤'; return d; }

    function setStatus(m, c) {
        var e = q('svd-stattxt');
        if (!e) return;
        e.textContent = m;
        e.className = c || '';
    }
    function setProgress(r) {
        var b = q('svd-prog'), f = q('svd-progfill');
        if (!b || !f) return;
        if (r <= 0 || r >= 1) { b.style.display = 'none'; f.style.width = '0%'; }
        else { b.style.display = 'block'; f.style.width = (r * 100).toFixed(1) + '%'; }
    }
    function setBtnsEnabled(on) {
        var vb = q('svd-btn-v'), cb = q('svd-btn-c');
        if (!on) { if (vb) vb.disabled = true; if (cb) cb.disabled = true; return; }
        if (vb) vb.disabled = !!(videoInfo && videoInfo.isImagePost);
        if (cb) cb.disabled = !(videoInfo && videoInfo.coverUrl);
    }
    function sanitize(s) { return (s||'').replace(/[\\/:*?"<>|\r\n]/g,'_').trim().substring(0,80); }
  function _idbOp(mode, fn) {
        return new Promise(function(resolve) {
            var req = indexedDB.open('svd_fs_db', 1);
            req.onupgradeneeded = function(e) { e.target.result.createObjectStore('handles'); };
            req.onsuccess = function(e) { fn(e.target.result, resolve); };
            req.onerror   = function() { resolve(null); };
        });
    }
    function _idbSaveHandle(handle) {
        return _idbOp('readwrite', function(db, resolve) {
            var tx = db.transaction('handles', 'readwrite');
            tx.objectStore('handles').put(handle, 'dir');
            tx.oncomplete = function() { db.close(); resolve(true); };
            tx.onerror    = function() { db.close(); resolve(false); };
        });
    }
    function _idbLoadHandle() {
        return _idbOp('readonly', function(db, resolve) {
            var tx = db.transaction('handles', 'readonly');
            var gr = tx.objectStore('handles').get('dir');
            gr.onsuccess = function() { db.close(); resolve(gr.result || null); };
            gr.onerror   = function() { db.close(); resolve(null); };
        });
    }
    async function _restoreDirHandle() {
        try {
            var handle = await _idbLoadHandle();
            if (!handle) return;
            var perm = await handle.queryPermission({ mode: 'readwrite' });
            if (perm === 'granted') {
                dirHandle = handle;
                _applyDirHandleUI(handle.name, true);
            } else {
                GM_setValue('svd_last_dir_name', handle.name);
                _applyDirHandleUI(handle.name, false);
            }
        } catch(e) {}
    }
    function _applyDirHandleUI(name, authorized) {
        var d = q('svd-path-txt');
        if (!d) return;
        if (authorized) {
            d.textContent = '📁 ' + name + ' (已授权)';
            d.title = '目录:' + name;
        } else {
            d.textContent = '📁 ' + name + '(请点击按钮重新授权)';
        }
        d.classList.add('set');
    }
     function setupHotkeys() {
        document.addEventListener('keydown', function(e) {
            // Alt+D = 切换小窗显示
            if (e.altKey && !e.ctrlKey && !e.metaKey && (e.key === 'd' || e.key === 'D')) {
                e.preventDefault();
                toggleWindow();
            }
            
            if (e.altKey && !e.ctrlKey && !e.metaKey && (e.key === 's' || e.key === 'S')) {
                e.preventDefault();
                quickDownloadCurrent();
            }
        });
    }
    function toggleWindow() {
        var w = q('svd-win'), t = q('svd-trig');
        if (!w) return;
        if (w.style.display === 'none' || w.style.display === '') {
            w.style.display = 'flex';
            if (t) t.style.display = 'none';
        } else {
            w.style.display = 'none';
            if (t) t.style.display = 'flex';
        }
    }
    function setupMenuCommands() {
        try {
            if (typeof GM_registerMenuCommand !== 'function') return;
            GM_registerMenuCommand('🪟 显示/隐藏小窗 (Alt+D)', toggleWindow);
            GM_registerMenuCommand('⚡ 当前视频 (Alt+S)', quickDownloadCurrent);
            GM_registerMenuCommand('🔄 刷新视频信息', doRefresh);
        } catch(e) {}
    }
     function makeDraggable(el, handle) {
        var d = false, sx, sy, ox, oy;

        function startDrag(cx, cy) {
            d = true; sx = cx; sy = cy;
            var r = el.getBoundingClientRect(); ox = r.left; oy = r.top;
        }
        function applyDrag(cx, cy) {
            if (!d) return;
            el.style.left  = Math.max(0, Math.min(ox + cx - sx, window.innerWidth  - el.offsetWidth))  + 'px';
            el.style.top   = Math.max(0, Math.min(oy + cy - sy, window.innerHeight - el.offsetHeight)) + 'px';
            el.style.right = 'auto';
        }

        handle.addEventListener('mousedown', function(e) {
            if (e.target.classList.contains('svd-wbtn')) return;
            startDrag(e.clientX, e.clientY);
            document.addEventListener('mousemove', mv);
            document.addEventListener('mouseup', mu);
            e.preventDefault();
        });
        function mv(e) { applyDrag(e.clientX, e.clientY); }
        function mu() { d = false; document.removeEventListener('mousemove', mv); document.removeEventListener('mouseup', mu); }

        handle.addEventListener('touchstart', function(e) {
            if (e.target.classList.contains('svd-wbtn')) return;
            var t = e.touches[0]; startDrag(t.clientX, t.clientY);
            e.preventDefault();
        }, { passive: false });
        handle.addEventListener('touchmove', function(e) {
            var t = e.touches[0]; applyDrag(t.clientX, t.clientY);
            e.preventDefault();
        }, { passive: false });
        handle.addEventListener('touchend', function() { d = false; });
    }
    function tickCapture() {
        var dot = q('svd-capdot'), txt = q('svd-captxt');
        if (!dot || !txt) return;
        var cc = capturedCovers.length, hasInfoCover = !!(videoInfo && videoInfo.coverUrl);
        if (cc || hasInfoCover) {
            dot.className = 'svd-dot on'; txt.className = 'on';
            txt.textContent = hasInfoCover ? '封面已就绪' : ('已捕获 ' + cc + ' 张封面图');
        } else {
            dot.className = 'svd-dot'; txt.className = '';
            txt.textContent = '等待封面加载...';
        }
        if (videoInfo && !videoInfo.coverUrl && cc) {
            videoInfo.coverUrl = bestCover();
            patchCoverUI(videoInfo.coverUrl);
        }
    }

    function patchCoverUI(url) {
        var el = q('svd-f-cov'); if (!el || !url) return;
        if (!el.querySelector('img')) {
            var ci = new Image(); ci.className = 'svd-cimg'; ci.src = url;
            ci.addEventListener('click', function() { window.open(url, '_blank'); });
            el.innerHTML = ''; el.appendChild(ci);
        }
        var cb = q('svd-btn-c'); if (cb) cb.disabled = false;
    }

    function renderInfo(info) {
        if (!info) { setStatus('❌ 未能解析视频信息,请等视频播放后刷新', 'err'); return; }
        if (!isDownloading) videoInfo = info;

        q('svd-f-plt').textContent = info.platform;

        var ae = q('svd-f-aut'); ae.innerHTML = '';
        var ac = document.createElement('div'); ac.className = 'svd-ac';
        if (info.avatarUrl) {
            var ai = new Image(); ai.className = 'svd-av'; ai.src = info.avatarUrl;
            ai.onerror = function() { ai.replaceWith(avPh()); };
            ac.appendChild(ai);
        } else ac.appendChild(avPh());
        var nw = document.createElement('div');
        nw.innerHTML = '<div class="svd-aname">' + esc(info.author) + '</div>' + (info.authorId ? '<div class="svd-aid">@' + esc(info.authorId) + '</div>' : '');
        ac.appendChild(nw); ae.appendChild(ac);

        q('svd-f-time').textContent = info.createTime;
        q('svd-f-desc').textContent = info.desc || '无文案';

        var te = q('svd-f-tags'); te.innerHTML = '';
        if (info.topics && info.topics.length) {
            var tw = document.createElement('div'); tw.className = 'svd-tags';
            info.topics.forEach(function(t) { var sp = document.createElement('span'); sp.className = 'svd-tag'; sp.textContent = t; tw.appendChild(sp); });
            te.appendChild(tw);
        } else te.innerHTML = '<span class="svd-na">无话题标签</span>';

        var ce = q('svd-f-cov'); ce.innerHTML = '';
        if (info.coverUrl) {
            var ci = new Image(); ci.className = 'svd-cimg'; ci.src = info.coverUrl; ci.title = '点击查看原图';
            ci.addEventListener('click', function() { window.open(info.coverUrl, '_blank'); });
            ci.onerror = function() { ce.innerHTML = '<div class="svd-cph">封面加载失败</div>'; };
            ce.appendChild(ci);
        } else ce.innerHTML = '<div class="svd-cph">封面加载中...</div>';

        var lbl = q('svd-content-lbl'); if (lbl) lbl.textContent = info.isImagePost ? '图片' : '视频';
        var ve = q('svd-f-vid'); ve.innerHTML = '';
        if (info.isImagePost) {
            if (info.images && info.images.length) buildImageGrid(ve, info);
            else ve.innerHTML = '<span class="svd-na">图文笔记(含背景音乐,无独立视频)</span>';
            var vbtn = q('svd-btn-v'); if (vbtn) vbtn.disabled = true;
        } else {
            if (info.videoUrl) {
                var vd = document.createElement('video'); vd.className = 'svd-vid'; vd.controls = true; vd.preload = 'metadata';
                if (info.coverUrl) vd.poster = info.coverUrl;
                vd.src = info.videoUrl; ve.appendChild(vd);
            } else ve.innerHTML = '<span class="svd-na">点击下载按钮自动捕获高清链接</span>';
        }

        var ue = q('svd-f-url');
        if (ue) {
            if (info.videoUrl) { ue.textContent = info.videoUrl.substring(0, 90) + (info.videoUrl.length > 90 ? '…' : ''); ue.className = 'svd-url found'; }
            else { ue.textContent = '点击下载按钮实时捕获'; ue.className = 'svd-url'; }
        }

        q('svd-btn-v').disabled = !!(info.isImagePost);
        q('svd-btn-c').disabled = !info.coverUrl;
        setStatus('✅ 视频信息加载完成', 'ok');
    }

    function buildImageGrid(container, info) {
        var grid = document.createElement('div'); grid.className = 'svd-imgrid';
        info.images.forEach(function(item, idx) {
            var url     = typeof item === 'string' ? item : item.url;
            var liveUrl = (typeof item === 'object' && item.liveUrl) ? item.liveUrl : null;
            var itemDiv = document.createElement('div'); itemDiv.className = 'svd-ig-item';
            var numLabel = document.createElement('span'); numLabel.className = 'svd-ig-idx'; numLabel.textContent = idx + 1;
            var img = new Image(); img.className = 'svd-igthumb'; img.src = url; img.loading = 'lazy';
            img.onerror = function() { itemDiv.style.background = '#f0f0f0'; img.style.opacity = '.3'; };
            var dlBtn = document.createElement('button'); dlBtn.className = 'svd-ig-dl'; dlBtn.title = '下载第' + (idx+1) + '张'; dlBtn.textContent = '⬇';
            (function(u, live, i) {
                dlBtn.addEventListener('click', function(e) {
                    e.stopPropagation();
                    if (live) doDownload(live, getFilename(info, 'image', i).replace(/\.(jpg|jpeg|png|webp)$/i, '.mp4'), '实况视频');
                    else doDownloadImage(u, getFilename(info, 'image', i));
                });
            })(url, liveUrl, idx);
            itemDiv.appendChild(img); itemDiv.appendChild(numLabel); itemDiv.appendChild(dlBtn);
            grid.appendChild(itemDiv);
        });
        container.appendChild(grid);

        var allBtn = document.createElement('button'); allBtn.className = 'svd-imgdl-all';
        allBtn.innerHTML = '⬇ 全部下载(' + info.images.length + '张)';
        allBtn.addEventListener('click', function() {
            if (imageDownloading) { setStatus('图片下载中,请稍候...', 'info'); return; }
            imageDownloading = true; allBtn.disabled = true;
            var total = info.images.length, done = 0;
            function scheduleNext(idx) {
                if (idx >= total) return;
                var item    = info.images[idx];
                var url     = typeof item === 'string' ? item : item.url;
                var liveUrl = (typeof item === 'object' && item.liveUrl) ? item.liveUrl : null;
                setTimeout(function() {
                    var finish = function() { done++; if (done >= total) { imageDownloading = false; allBtn.disabled = false; notify('批量完成', '共保存 ' + total + ' 个文件'); } };
                    if (liveUrl) { doDownload(liveUrl, getFilename(info, 'image', idx).replace(/\.(jpg|jpeg|png|webp)$/i, '.mp4'), '实况视频'); finish(); }
                    else doDownloadImage(url, getFilename(info, 'image', idx), finish);
                    scheduleNext(idx + 1);
                }, idx === 0 ? 0 : 300);
            }
            scheduleNext(0);
        });
        container.appendChild(allBtn);
    }
    
  bootstrap().catch((error) => {
    log.err('脚本启动失败', error);
  });
})();