// ==UserScript==
// @name         上海开放大学/上开自动刷视频【可加速及自动下一页】
// @namespace    https://l.shou.org.cn/
// @namespace   一心向善
// @version      1.7
// @description  上海开放大学相关视频自动学习自动看视频程序【可加速及自动下一页】【需要答题及合作联系群主】。
// @author       user
// @match        https://l.shou.org.cn/study/learnCatalogNew.aspx*
// @match        https://l.shou.org.cn/study/directory.aspx*
// @match        https://l.shou.org.cn/study/activity-preview.aspx*
// @match        https://l.shou.org.cn/activity-middle/Playback*
// @match        https://l.shou.org.cn/study/play.aspx*
// @run-at       document-idle
// @noframes
// @icon         https://www.google.com/s2/favicons?sz=64&domain=shou.org.cn
// @grant        none
// @license All Rights Reserved
// ==/UserScript==

/*
 * ==================== 平台接口（已实测抓取） ====================
 * A. 学习目录视频（directory.aspx，DPlayer / HTML5 video）
 *    1) 单元与播放地址（返回 ldoc.shou.org.cn 带 token 的 mp4）：
 *       POST /study/action-directory-getCell
 *    2) 每 60 秒学习进度 + 完播上报：
 *       POST /study/action-directory-CellLeaveLog
 *       { logId, cellId, videoEndTime, videoLengthTime, playbackSpeed }
 *    3) 完成标记：
 *       POST /study/action-student-signLearned  { cellId, videoLength }
 *
 * B. 学习活动-直播课回看（activity-middle/Playback，videojs）
 *    1) 开始：POST /activity-middle/api/course-activity-process/play-back-view-log-start
 *       { activityId, videoStartTime, timestamp, playRate } -> r.result 即 logId
 *    2) 每 60 秒 / 结束：POST .../play-back-view-log-end
 *       { logId, videoEndTime, timestamp }（需请求头 Authorization: Bearer <JWT>）
 *    3) 播放地址：GET ./api/resource-process/transfer-file/<activityId>
 *
 * C. 学习活动-录播课回放（study/play.aspx?url=...）
 *    每 60 秒：POST /study/action-preview-recordJoinInfoForUrl { url }
 *    注：部分旧录像服务端解密失败，页面视频源为 “Decrypt Failed!”，脚本自动跳过。
 *
 * 脚本不伪造任何进度：所有计时/上报仍由平台页面自身的 JS 完成。
 * ================================================================
 */

(function () {
    'use strict';

    if (window.__SHOU_AUTO_DASH__) return;
    window.__SHOU_AUTO_DASH__ = true;

    var STATE_KEY = 'SHOU_AUTO_STUDY_V2';
    var CFG_KEY = 'SHOU_AUTO_STUDY_CFG_V1';
    var DEF_CFG = { muted: true, dwellSec: 60, embed: true };

    var path = location.pathname;
    var isCatalog = /learnCatalogNew\.aspx$/i.test(path);
    var isDirectory = /directory\.aspx$/i.test(path);
    var isActivityPreview = /activity-preview\.aspx$/i.test(path);
    var isPlayback = /\/activity-middle\/Playback/i.test(path);
    var isPlayAs = /play\.aspx$/i.test(path);

    /* ---------------- 基础工具 ---------------- */

    function loadState() {
        try { return JSON.parse(localStorage.getItem(STATE_KEY) || 'null'); } catch (e) { return null; }
    }
    function saveStateNow() {
        try { localStorage.setItem(STATE_KEY, JSON.stringify(ENGINE.st)); } catch (e) {}
    }
    var saveTimer = null;
    function saveState() {
        if (saveTimer) return;
        saveTimer = setTimeout(function () { saveTimer = null; saveStateNow(); }, 600);
    }
    function loadCfg() {
        var c = {};
        try { c = JSON.parse(localStorage.getItem(CFG_KEY) || '{}'); } catch (e) {}
        var out = {};
        for (var k in DEF_CFG) out[k] = DEF_CFG[k];
        for (var k2 in c) out[k2] = c[k2];
        return out;
    }
    function saveCfg(c) {
        try { localStorage.setItem(CFG_KEY, JSON.stringify(c)); } catch (e) {}
    }
    function esc(s) {
        return String(s == null ? '' : s).replace(/[&<>"']/g, function (m) {
            return ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' })[m];
        });
    }
    function qs() { return new URLSearchParams(location.search); }
    function courseKey() {
        var p = qs();
        return p.get('CourseOpenId') || p.get('courseOpenId') || p.get('minorCourseOpenId') || p.get('minorcourseopenid') || '';
    }
    function ts() {
        var d = new Date();
        function p(n) { return n < 10 ? '0' + n : '' + n; }
        return p(d.getHours()) + ':' + p(d.getMinutes()) + ':' + p(d.getSeconds());
    }

    var ENGINE = { st: null, stage: null, poll: null, listeners: [], token: 0 };

    /* ---------------- 队列构建 ---------------- */

    function buildQueue() {
        var items = [];
        var seen = {};
        var coid = courseKey();

        var cont = document.getElementById('process_container');
        if (cont) {
            var rows = cont.querySelectorAll('tr.dynamic_topic');
            for (var i = 0; i < rows.length; i++) {
                var resList = rows[i].querySelectorAll('.sh-res');
                for (var j = 0; j < resList.length; j++) {
                    var res = resList[j];
                    var a = res.querySelector('a');
                    if (!a) continue;
                    var type = ((res.querySelector('.sh-res-b') || {}).textContent || '').replace(/[\s()]/g, '');
                    var href = a.getAttribute('href') || '';
                    var cellId = a.getAttribute('data-id') || '';
                    if (!cellId) {
                        try {
                            var q = new URLSearchParams(href.split('?')[1] || '');
                            cellId = q.get('cellId') || q.get('cellid') || '';
                        } catch (e) {}
                    }
                    if (!cellId || seen[cellId]) continue;
                    seen[cellId] = true;

                    var url;
                    if (/\/study\/directory\.aspx/i.test(href)) {
                        url = new URL(href, location.origin).href;
                    } else {
                        url = location.origin + '/study/directory.aspx?CourseOpenId=' + encodeURIComponent(coid) +
                            '&minorcourseopenid=' + encodeURIComponent(coid) + '&cellId=' + encodeURIComponent(cellId);
                    }
                    items.push({
                        kind: 'cell',
                        type: type || '资源',
                        name: a.getAttribute('title') || a.textContent.trim(),
                        key: cellId,
                        url: url
                    });
                }
            }
        }

        var actTb = document.getElementById('tb_activities');
        if (actTb) {
            var trs = actTb.querySelectorAll('tr');
            for (var k = 0; k < trs.length; k++) {
                var alink = trs[k].querySelector('a');
                if (!alink) continue;
                var actUrl;
                try { actUrl = new URL(alink.getAttribute('href'), location.origin); } catch (e) { continue; }
                var activityId = actUrl.searchParams.get('activityId');
                if (!activityId || seen[activityId]) continue;
                seen[activityId] = true;
                items.push({
                    kind: 'activity',
                    type: '学习活动',
                    name: alink.textContent.trim(),
                    key: activityId,
                    url: actUrl.href
                });
            }
        }
        return items;
    }

    function newState(items) {
        var status = [];
        var progress = [];
        for (var i = 0; i < items.length; i++) { status.push('pending'); progress.push(0); }
        return {
            v: 2,
            catalogUrl: location.href,
            courseKey: courseKey(),
            items: items,
            idx: 0,
            running: false,
            status: status,
            progress: progress,
            logs: []
        };
    }

    /* ---------------- 控制台 UI ---------------- */

    function $(s, r) { return (r || document).querySelector(s); }

    function addLog(msg) {
        var st = ENGINE.st;
        if (!st) return;
        st.logs.push('[' + ts() + '] ' + msg);
        if (st.logs.length > 150) st.logs = st.logs.slice(st.logs.length - 150);
        var box = $('#shou-log');
        if (box) { box.textContent = st.logs.join('\n'); box.scrollTop = box.scrollHeight; }
        saveState();
    }

    function setStatus(i, s) {
        if (ENGINE.st) ENGINE.st.status[i] = s;
        saveState();
        updateSummary();
    }
    function setProgress(i, pct) {
        pct = Math.max(0, Math.min(100, Math.round(pct)));
        if (ENGINE.st) ENGINE.st.progress[i] = pct;
        var el = document.getElementById('shou-pct-' + i);
        if (el) el.textContent = pct + '%';
        saveState();
    }

    function statusIcon(s) {
        return s === 'done' ? '✔' : s === 'running' ? '▶' : s === 'skipped' ? '✖' : '·';
    }
    function statusColor(s) {
        return s === 'done' ? '#2e7d32' : s === 'running' ? '#1876d2' : s === 'skipped' ? '#c62828' : '#999';
    }

    function renderList() {
        var box = $('#shou-list');
        var st = ENGINE.st;
        if (!box || !st) return;
        var html = '';
        for (var i = 0; i < st.items.length; i++) {
            var it = st.items[i];
            var s = st.status[i] || 'pending';
            var bg = s === 'running' ? '#eaf3fd' : (i % 2 ? '#fff' : '#fafbfc');
            html += '<div class="shou-row" data-i="' + i + '" title="双击从此项开始自动连播" ' +
                'style="display:flex;align-items:center;gap:6px;padding:4px 8px;cursor:pointer;' +
                'border-bottom:1px solid #f0f2f5;background:' + bg + ';">' +
                '<span style="flex:0 0 14px;color:' + statusColor(s) + ';font-weight:600;">' + statusIcon(s) + '</span>' +
                '<span style="flex:0 0 auto;color:#888;font-size:11px;">' + (i + 1) + '</span>' +
                '<span style="flex:0 0 auto;color:#1876d2;font-size:11px;border:1px solid #d6e6f7;border-radius:3px;padding:0 3px;">' +
                esc(it.type) + '</span>' +
                '<span style="flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:12px;" title="' +
                esc(it.name) + '">' + esc(it.name) + '</span>' +
                '<span id="shou-pct-' + i + '" style="flex:0 0 34px;text-align:right;color:#666;font-size:11px;">' +
                ((st.progress[i] || 0) ? st.progress[i] + '%' : '') + '</span></div>';
        }
        box.innerHTML = html;
        scrollCurrent();
    }

    function scrollCurrent() {
        var st = ENGINE.st;
        if (!st) return;
        var box = $('#shou-list');
        if (!box) return;
        var row = $('.shou-row[data-i="' + st.idx + '"]', box);
        if (!row) return;
        var rb = row.getBoundingClientRect();
        var bb = box.getBoundingClientRect();
        if (rb.top < bb.top || rb.bottom > bb.bottom) {
            box.scrollTop += (rb.top - bb.top) - 8;
        }
    }

    function updateSummary() {
        var st = ENGINE.st;
        if (!st) return;
        var n = st.items.length;
        var done = 0, skipped = 0;
        for (var i = 0; i < n; i++) {
            if (st.status[i] === 'done') done++;
            else if (st.status[i] === 'skipped') skipped++;
        }
        var sum = $('#shou-sum');
        if (sum) sum.textContent = '总进度 ' + (done + skipped) + '/' + n + '（完成 ' + done + '，跳过 ' + skipped + '）';
        var bar = $('#shou-bar-i');
        if (bar) bar.style.width = (n ? ((done + skipped) / n * 100) : 0) + '%';
        var cur = $('#shou-cur');
        if (cur) {
            if (!n) cur.textContent = '正在识别课程目录…';
            else if (st.idx >= n) cur.textContent = '全部任务已结束';
            else cur.textContent = (st.running ? '正在执行 ' : '待执行 ') + (st.idx + 1) + '/' + n + ' · ' + st.items[st.idx].name;
        }
        var startBtn = $('#shou-b-start');
        if (startBtn) startBtn.textContent = st.running ? '执行中…' : '开始/继续';
    }

    function buildDash() {
        if (document.getElementById('shou-dash')) return;
        var d = document.createElement('div');
        d.id = 'shou-dash';
        d.style.cssText = 'position:fixed;right:16px;top:16px;z-index:2147483645;width:390px;' +
            'max-height:calc(100vh - 32px);display:flex;flex-direction:column;background:#fff;' +
            'border:1px solid #dfe3e8;border-radius:12px;box-shadow:0 10px 28px rgba(0,0,0,.18);' +
            'font:13px/1.55 -apple-system,BlinkMacSystemFont,"Microsoft YaHei",Arial,sans-serif;color:#333;overflow:hidden;';
        d.innerHTML =
            '<div style="background:linear-gradient(90deg,#1876d2,#2f8ee0);color:#fff;padding:9px 12px;' +
            'font-weight:600;display:flex;justify-content:space-between;align-items:center;">' +
            '<span>上开自动学习【答题及合作联系群主】</span>' +
            '<span id="shou-min" style="cursor:pointer;font-weight:400;font-size:12px;opacity:.9;">收起</span></div>' +
            '<div id="shou-body" style="padding:8px 12px 10px;display:flex;flex-direction:column;min-height:0;">' +
            '<div id="shou-sum" style="font-size:12px;color:#555;">总进度 0/0</div>' +
            '<div style="height:6px;background:#eef1f4;border-radius:3px;margin:6px 0 8px;overflow:hidden;">' +
            '<i id="shou-bar-i" style="display:block;height:100%;width:0;background:#1876d2;transition:width .3s;"></i></div>' +
            '<div id="shou-cur" style="font-size:12px;color:#1876d2;margin-bottom:8px;white-space:nowrap;' +
            'overflow:hidden;text-overflow:ellipsis;">识别中…</div>' +
            '<div style="display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px;align-items:center;">' +
            '<button id="shou-b-start" style="flex:1;background:#1876d2;color:#fff;border:0;border-radius:6px;' +
            'padding:6px 8px;cursor:pointer;">开始/继续</button>' +
            '<button id="shou-b-pause" style="background:#f1f1f1;border:0;border-radius:6px;padding:6px 8px;cursor:pointer;">暂停</button>' +
            '<button id="shou-b-reset" style="background:#fbe9e7;color:#c62828;border:0;border-radius:6px;padding:6px 8px;cursor:pointer;">重置</button>' +
            '</div>' +
            '<div style="display:flex;gap:12px;flex-wrap:wrap;margin-bottom:8px;align-items:center;font-size:12px;color:#555;">' +
            '<label><input type="checkbox" id="shou-c-embed"> 内嵌播放（不跳页）</label>' +
            '<label><input type="checkbox" id="shou-c-mute"> 静音</label>' +
            '<label>文档/链接 <input id="shou-c-dwell" type="number" min="5" step="5" style="width:54px;"> 秒</label>' +
            '</div>' +
            '<div style="font-size:12px;color:#888;margin-bottom:4px;">任务列表（自动滚动；双击任意项从该项开始自动连播）</div>' +
            '<div id="shou-list" style="overflow-y:auto;max-height:30vh;border:1px solid #eef1f4;border-radius:6px;background:#fafbfc;"></div>' +
            '<div style="font-size:12px;color:#888;margin:8px 0 4px;">播放日志（自动滚动）</div>' +
            '<div id="shou-log" style="height:92px;overflow-y:auto;background:#0f1419;color:#c9d1d9;' +
            'font:11px/1.5 Consolas,Menlo,monospace;border-radius:6px;padding:6px 8px;white-space:pre-wrap;"></div>' +
            '<div style="margin-top:8px;padding:8px 10px;border-radius:6px;background:linear-gradient(90deg,#c62828,#e53935);' +
            'color:#fff;font-weight:700;font-size:14px;text-align:center;line-height:1.65;letter-spacing:.5px;' +
            'box-shadow:0 2px 10px rgba(198,40,40,.35);">答题或批量合作，联系Q：640105435<br>' +
            'Q群1：949193546｜Q群2：756253160</div>' +
            '</div>';
        document.body.appendChild(d);

        var hs = document.createElement('style');
        hs.textContent = '.shou-row:hover{background:#f2f7fd !important;}';
        document.head.appendChild(hs);

        var cfg = loadCfg();
        $('#shou-c-embed').checked = cfg.embed;
        $('#shou-c-mute').checked = cfg.muted;
        $('#shou-c-dwell').value = cfg.dwellSec;
        $('#shou-c-embed').addEventListener('change', function () {
            cfg.embed = this.checked; saveCfg(cfg);
            addLog(cfg.embed ? '已切换：内嵌播放' : '已切换：跳转模式（下个任务生效）');
        });
        $('#shou-c-mute').addEventListener('change', function () {
            cfg.muted = this.checked; saveCfg(cfg);
        });
        $('#shou-c-dwell').addEventListener('change', function () {
            cfg.dwellSec = Math.max(5, parseInt(this.value, 10) || 60);
            this.value = cfg.dwellSec; saveCfg(cfg);
        });
        $('#shou-min').addEventListener('click', function () {
            var body = $('#shou-body');
            var hidden = body.style.display === 'none';
            body.style.display = hidden ? 'flex' : 'none';
            this.textContent = hidden ? '收起' : '展开';
        });
        $('#shou-b-start').addEventListener('click', onStart);
        $('#shou-b-pause').addEventListener('click', onPause);
        $('#shou-b-reset').addEventListener('click', onReset);
        $('#shou-list').addEventListener('dblclick', function (e) {
            var row = e.target && e.target.closest ? e.target.closest('.shou-row') : null;
            if (!row) return;
            var i = parseInt(row.getAttribute('data-i'), 10);
            if (isNaN(i)) return;
            jumpTo(i);
        });
    }

    function renderAll() {
        renderList();
        updateSummary();
        var log = $('#shou-log');
        if (log && ENGINE.st) log.textContent = (ENGINE.st.logs || []).join('\n');
        if (log) log.scrollTop = log.scrollHeight;
    }

    /* ---------------- 内嵌播放器 ---------------- */

    function ensureStage() {
        if (ENGINE.stage && ENGINE.stage.parentNode) return ENGINE.stage;
        var s = document.createElement('iframe');
        s.id = 'shou-stage';
        s.setAttribute('allow', 'autoplay; fullscreen');
        s.style.cssText = 'position:fixed;left:16px;bottom:16px;width:900px;height:600px;transform:scale(.5);' +
            'transform-origin:bottom left;border:2px solid #1876d2;border-radius:8px;background:#000;' +
            'z-index:2147483644;box-shadow:0 8px 24px rgba(0,0,0,.28);';
        document.body.appendChild(s);
        ENGINE.stage = s;
        return s;
    }

    function clearWatch() {
        if (ENGINE.poll) { clearInterval(ENGINE.poll); ENGINE.poll = null; }
        ENGINE.hook = null;
        for (var i = 0; i < ENGINE.listeners.length; i++) {
            var l = ENGINE.listeners[i];
            try { l[0].removeEventListener(l[1], l[2]); } catch (e) {}
        }
        ENGINE.listeners = [];
    }
    function listen(t, f, o) {
        try { t.addEventListener(f, o); ENGINE.listeners.push([t, f, o]); } catch (e) {}
    }

    function neutralizeFrame() {
        try {
            var w = ENGINE.stage && ENGINE.stage.contentWindow;
            if (w) {
                w.onbeforeunload = null;
                w.onunload = null;
                try { w.onbeforeunload_handler = null; w.onunload_handler = null; } catch (e) {}
            }
        } catch (e) {}
    }
    function hardenFrame() {
        try {
            var w = ENGINE.stage && ENGINE.stage.contentWindow;
            if (!w || !w.document) return false;
            w.alert = function (m) { addLog('[站内提示] ' + String(m)); };
            w.confirm = function () { return true; };
            w.open = function () { return null; };
            w.onbeforeunload = null;
            w.onunload = null;
            return true;
        } catch (e) { return false; }
    }

    function navigateStage(url, cb) {
        var token = ++ENGINE.token;
        neutralizeFrame();
        ENGINE.stage.onload = function () {
            if (token !== ENGINE.token) return;
            hardenFrame();
            cb();
        };
        ENGINE.stage.src = url;
    }

    function iframeVideoSrc(v) {
        if (!v) return '';
        var s = v.querySelector('source');
        var src = (s && s.getAttribute('src')) || v.currentSrc || v.src || '';
        return src;
    }

    function getFrameDoc() {
        try {
            var d = ENGINE.stage && ENGINE.stage.contentDocument;
            return d || null;
        } catch (e) { return null; }
    }

    function embedRejected(i) {
        var cfg = loadCfg();
        cfg.embed = false;
        saveCfg(cfg);
        addLog('⚠ 站点拒绝内嵌加载，已自动切换为跳转模式');
        jumpGo(ENGINE.st, i);
    }

    /* ---------------- 后台保活 ---------------- */

    function activeVideo() {
        try {
            var d = getFrameDoc();
            if (d) { var v = d.querySelector('video'); if (v) return v; }
        } catch (e) {}
        try { return document.querySelector('video'); } catch (e) { return null; }
    }

    function isPageHidden() {
        if (document.hidden) return true;
        try { var d = getFrameDoc(); return !!(d && d.hidden); } catch (e) { return false; }
    }

    function runSoon(fn, delay) {
        if (isPageHidden()) { try { fn(); } catch (e) {} return; }
        setTimeout(fn, delay);
    }
    /* 页面在后台时直接把流程转到下一项，避免被浏览器节流的 setTimeout 拖慢 */
    function goNext(i, delay) {
        runSoon(function () { processItem(i + 1); }, delay);
    }
    function jumpNextSoon(st, delay) {
        runSoon(function () { jumpNext(st); }, delay);
    }

    var HEART = null;
    function startHeartbeat() {
        if (HEART) return;
        try {
            var code = 'setInterval(function(){postMessage(1)},2000);';
            var burl = URL.createObjectURL(new Blob([code], { type: 'text/javascript' }));
            HEART = new Worker(burl);
            HEART.onmessage = function () {
                if (!ENGINE.st || !ENGINE.st.running) return;
                if (ENGINE.hook) { try { ENGINE.hook(); } catch (e) {} }
                var v = activeVideo();
                if (!v || v.ended || v.readyState < 1) return;
                if (Math.abs(v.playbackRate - 1) > 0.01) { try { v.playbackRate = 1; } catch (e) {} }
                if (v.paused) {
                    try { v.play(); } catch (e) {}
                    addLog('检测到后台被暂停，已自动恢复播放');
                }
            };
        } catch (e) { HEART = null; }
    }

    document.addEventListener('visibilitychange', function () {
        var st = ENGINE.st;
        if (!st || !st.running) return;
        var v = activeVideo();
        if (v && !v.ended) {
            try { v.playbackRate = 1; } catch (e) {}
            if (v.paused) { try { v.play(); } catch (e) {} }
        }
        if (document.hidden) addLog('已切到后台：继续 1 倍速播放，播完自动下一项');
        else addLog('已回到前台：继续跟随当前任务');
    });

    /* ---------------- 播放 ---------------- */

    function playVideo(v, i, label) {
        var cfg = loadCfg();
        clearWatch();
        startHeartbeat();

        try { v.playbackRate = 1; } catch (e) {}
        if (cfg.muted) { try { v.muted = true; } catch (e) {} }

        var lockRate = function () {
            if (Math.abs(v.playbackRate - 1) > 0.01) { try { v.playbackRate = 1; } catch (e) {} }
        };
        listen(v, 'ratechange', lockRate);

        var w = ENGINE.stage.contentWindow;
        try { if (w.dp && typeof w.dp.play === 'function') w.dp.play(); } catch (e) {}
        try { if (w.player && typeof w.player.play === 'function') w.player.play(); } catch (e) {}
        try { v.play(); } catch (e) {}

        var done = false;
        var finish = function () {
            if (done) return;
            done = true;
            clearWatch();
            setStatus(i, 'done');
            setProgress(i, 100);
            addLog('完成（' + (i + 1) + '）' + label);
            scrollCurrent();
            goNext(i, 2200);
        };

        var tick = function () {
            if (done) return;
            var d = v.duration;
            if (d && isFinite(d) && d > 0) {
                setProgress(i, Math.min(99, v.currentTime / d * 100));
                if (v.currentTime >= d - 1.2) finish();
            }
        };

        listen(v, 'ended', finish);
        listen(v, 'timeupdate', tick);
        listen(v, 'error', function () {
            if (done) return;
            addLog('⚠ 视频加载失败，10 秒后跳过');
            setTimeout(function () {
                if (done) return;
                done = true;
                clearWatch();
                setStatus(i, 'skipped');
                goNext(i, 600);
            }, 10000);
        });

        ENGINE.poll = setInterval(function () {
            if (!ENGINE.st || !ENGINE.st.running) return;
            if (done) return;
            if (v.paused && !v.ended) { try { v.play(); } catch (e) {} }
            tick();
        }, 1000);

        addLog('播放中（1 倍速）：' + label);
        updateSummary();
    }

    function dwellThenNext(i, it) {
        var cfg = loadCfg();
        var total = cfg.dwellSec;
        var start = Date.now();
        addLog('[' + it.type + '] 无视频，停留 ' + total + ' 秒计时后自动下一个：' + it.name);
        ENGINE.poll = setInterval(function () {
            if (!ENGINE.st || !ENGINE.st.running) return;
            var elapsed = (Date.now() - start) / 1000;
            setProgress(i, Math.min(99, elapsed / total * 100));
            if (elapsed >= total) {
                clearWatch();
                setStatus(i, 'done');
                setProgress(i, 100);
                addLog('完成（' + (i + 1) + '）' + it.name);
                goNext(i, 800);
            }
        }, 1000);
    }

    /* ---------------- 内嵌引擎 ---------------- */

    function processItem(i) {
        var st = ENGINE.st;
        if (!st) return;
        if (i >= st.items.length) {
            st.running = false;
            st.idx = i;
            saveStateNow();
            clearWatch();
            neutralizeFrame();
            if (ENGINE.stage) ENGINE.stage.src = 'about:blank';
            addLog('全部任务结束（' + st.items.length + '/' + st.items.length + '）');
            renderAll();
            return;
        }
        st.idx = i;
        st.status[i] = 'running';
        saveStateNow();
        renderList();
        updateSummary();

        var it = st.items[i];
        addLog('开始（' + (i + 1) + '/' + st.items.length + '）[' + it.type + '] ' + it.name);

        if (!loadCfg().embed) {
            jumpGo(st, i);
            return;
        }

        stopPoll();
        ensureStage();
        startHeartbeat();
        if (it.kind === 'cell') openCell(it, i);
        else openActivity(it, i);
    }

    function stopPoll() {
        clearWatch();
    }

    function openCell(it, i) {
        navigateStage(it.url, function () {
            var start = Date.now(), nulls = 0, stopped = false;
            var step = function () {
                if (stopped || !ENGINE.st || !ENGINE.st.running) return;
                var d = getFrameDoc();
                if (!d) {
                    if (++nulls >= 16) { stop(); embedRejected(i); }
                    return;
                }
                nulls = 0;
                var v = d.querySelector('video');
                var src = iframeVideoSrc(v);
                if (v && src && !/Decrypt Failed/i.test(src)) {
                    stop();
                    playVideo(v, i, '目录视频：' + it.name);
                    return;
                }
                if (Date.now() - start >= 10000) {
                    stop();
                    dwellThenNext(i, it);
                }
            };
            var stop = function () {
                stopped = true;
                clearInterval(ENGINE.poll); ENGINE.poll = null;
                if (ENGINE.hook === step) ENGINE.hook = null;
            };
            ENGINE.hook = step;
            ENGINE.poll = setInterval(step, 500);
        });
    }

    function openActivity(it, i) {
        navigateStage(it.url, function () {
            var start = Date.now(), nulls = 0, stopped = false;
            var step = function () {
                if (stopped || !ENGINE.st || !ENGINE.st.running) return;
                var d = getFrameDoc();
                if (!d) {
                    if (++nulls >= 16) { stop(); embedRejected(i); }
                    return;
                }
                nulls = 0;
                var w = ENGINE.stage.contentWindow;
                var links = d.querySelectorAll('a[href]');
                var target = null;
                for (var j = 0; j < links.length; j++) {
                    if (/\/activity-middle\/Playback/i.test(links[j].getAttribute('href') || '')) { target = links[j]; break; }
                }
                if (!target) {
                    for (var k = 0; k < links.length; k++) {
                        var h = links[k].getAttribute('href') || '';
                        if (/\/study\/play\.aspx/i.test(h) && /回放|回看/.test(links[k].textContent)) { target = links[k]; break; }
                    }
                }
                if (target) {
                    stop();
                    var url = new URL(target.getAttribute('href'), (w && w.location ? w.location.origin : location.origin)).href;
                    addLog('进入回看：' + it.name);
                    openPlayback(url, i, it);
                    return;
                }
                if (Date.now() - start >= 10000) {
                    stop();
                    addLog('该活动暂无可用回看，跳过');
                    setStatus(i, 'skipped');
                    runSoon(function () { processItem(i + 1); }, 800);
                }
            };
            var stop = function () {
                stopped = true;
                clearInterval(ENGINE.poll); ENGINE.poll = null;
                if (ENGINE.hook === step) ENGINE.hook = null;
            };
            ENGINE.hook = step;
            ENGINE.poll = setInterval(step, 500);
        });
    }

    function openPlayback(url, i, it) {
        navigateStage(url, function () {
            var start = Date.now(), nulls = 0, stopped = false;
            var step = function () {
                if (stopped || !ENGINE.st || !ENGINE.st.running) return;
                var d = getFrameDoc();
                if (!d) {
                    if (++nulls >= 16) { stop(); embedRejected(i); }
                    return;
                }
                nulls = 0;
                var v = d.querySelector('video');
                var src = iframeVideoSrc(v);
                if (v && src && !/Decrypt Failed/i.test(src)) {
                    stop();
                    playVideo(v, i, '活动回看：' + it.name);
                    return;
                }
                if (Date.now() - start >= 12000) {
                    stop();
                    addLog('回放无可用视频或加密源解密失败（Decrypt Failed），跳过');
                    setStatus(i, 'skipped');
                    runSoon(function () { processItem(i + 1); }, 800);
                }
            };
            var stop = function () {
                stopped = true;
                clearInterval(ENGINE.poll); ENGINE.poll = null;
                if (ENGINE.hook === step) ENGINE.hook = null;
            };
            ENGINE.hook = step;
            ENGINE.poll = setInterval(step, 500);
        });
    }

    /* ---------------- 跳转模式（备用） ---------------- */

    function jumpGo(st, idx) {
        st.idx = idx;
        if (idx >= st.items.length) {
            st.running = false;
            saveStateNow();
            location.href = st.catalogUrl;
            return;
        }
        saveStateNow();
        location.href = st.items[idx].url;
    }
    function jumpNext(st) {
        jumpGo(st, st.idx + 1);
    }

    function getJumpItem(st) {
        if (!st || !st.running || !st.items) return null;
        var it = st.items[st.idx];
        if (!it) return null;
        var p = qs();
        if (isDirectory) return (it.kind === 'cell' && p.get('cellId') === it.key) ? it : null;
        if (isActivityPreview) return (it.kind === 'activity' && p.get('activityId') === it.key) ? it : null;
        if (isPlayback) {
            var aid = p.get('activityId');
            return (it.kind === 'activity' && (!aid || aid === it.key)) ? it : null;
        }
        if (isPlayAs) return (it.kind === 'activity') ? it : null;
        return null;
    }

    function jumpWireVideo(v, i, st) {
        var cfg = loadCfg();
        startHeartbeat();
        var done = false;
        var lock = function () { if (Math.abs(v.playbackRate - 1) > 0.01) { try { v.playbackRate = 1; } catch (e) {} } };
        lock();
        v.addEventListener('ratechange', lock);
        if (cfg.muted) { try { v.muted = true; } catch (e) {} }

        var finish = function () {
            if (done) return;
            done = true;
            setStatus(i, 'done');
            setProgress(i, 100);
            addLog('完成（' + (i + 1) + '）' + st.items[i].name);
            jumpNextSoon(st, 2200);
        };
        var check = function () {
            if (done) return;
            if (v.duration && isFinite(v.duration) && v.currentTime >= v.duration - 1.2) finish();
        };
        v.addEventListener('ended', finish);
        v.addEventListener('timeupdate', check);
        var tick = setInterval(function () {
            if (done) return;
            if (v.paused && !v.ended) { try { v.play(); } catch (e) {} }
            check();
        }, 1000);
        try { v.play(); } catch (e) {}
    }

    function runJumpPage() {
        var st = loadState();
        if (!st || !st.running || loadCfg().embed) return;
        var it = getJumpItem(st);
        if (!it) return;
        ENGINE.st = st;
        var i = st.idx;
        startHeartbeat();

        if (isDirectory) {
            var startDir = Date.now();
            var iv = setInterval(function () {
                var v = document.querySelector('video');
                var src = iframeVideoSrc(v);
                if (v && src && !/Decrypt Failed/i.test(src)) {
                    clearInterval(iv);
                    jumpWireVideo(v, i, st);
                    return;
                }
                if (Date.now() - startDir >= 8000) {
                    clearInterval(iv);
                    var cfg = loadCfg();
                    addLog('[' + it.type + '] 停留 ' + cfg.dwellSec + ' 秒后下一个：' + it.name);
                    var dwellStart = Date.now();
                    var dw = setInterval(function () {
                        if (Date.now() - dwellStart >= cfg.dwellSec * 1000) {
                            clearInterval(dw);
                            setStatus(i, 'done');
                            jumpNext(st);
                        }
                    }, 1000);
                }
            }, 1000);
        } else if (isActivityPreview) {
            var links = document.querySelectorAll('a[href]');
            var target = null;
            for (var j = 0; j < links.length; j++) {
                if (/\/activity-middle\/Playback/i.test(links[j].getAttribute('href') || '')) { target = links[j]; break; }
            }
            if (!target) {
                for (var k = 0; k < links.length; k++) {
                    var h = links[k].getAttribute('href') || '';
                    if (/\/study\/play\.aspx/i.test(h) && /回放|回看/.test(links[k].textContent)) { target = links[k]; break; }
                }
            }
            if (target) runSoon(function () { location.href = new URL(target.getAttribute('href'), location.origin).href; }, 1200);
            else runSoon(function () { setStatus(i, 'skipped'); jumpNext(st); }, 8000);
        } else if (isPlayback || isPlayAs) {
            var startPb = Date.now();
            var iv2 = setInterval(function () {
                var v = document.querySelector('video');
                var src = iframeVideoSrc(v);
                if (v && src && !/Decrypt Failed/i.test(src)) {
                    clearInterval(iv2);
                    jumpWireVideo(v, i, st);
                    return;
                }
                if (Date.now() - startPb >= 15000) {
                    clearInterval(iv2);
                    addLog('回放无可用视频/解密失败，跳过');
                    setStatus(i, 'skipped');
                    runSoon(function () { jumpNext(st); }, 800);
                }
            }, 1000);
        }
    }

    /* ---------------- 控制 ---------------- */

    function jumpTo(i) {
        var st = ENGINE.st;
        if (!st || !st.items || !st.items.length) return;
        if (i < 0 || i >= st.items.length) return;
        clearWatch();
        ENGINE.token++;
        st.idx = i;
        st.running = true;
        saveStateNow();
        renderList();
        updateSummary();
        addLog('↪ 双击跳转，从第 ' + (i + 1) + ' 项开始自动连播：' + st.items[i].name);
        scrollCurrent();
        if (!loadCfg().embed) { jumpGo(st, i); return; }
        processItem(i);
    }

    function onStart() {
        var st = ENGINE.st;
        if (!st) return;
        if (!st.items.length) {
            addLog('未识别到学习目录资源或学习活动，请确认已进入“学习目录”页');
            return;
        }
        if (st.idx >= st.items.length) {
            ENGINE.st = newState(buildQueue());
            ENGINE.st.running = true;
            saveStateNow();
            renderAll();
            processItem(0);
            return;
        }
        st.running = true;
        saveStateNow();
        updateSummary();
        addLog('▶ 开始/继续自动学习');

        if (!loadCfg().embed) { jumpGo(st, st.idx); return; }

        var w = ENGINE.stage && ENGINE.stage.contentWindow;
        var v = w && w.document.querySelector('video');
        var src = iframeVideoSrc(v);
        if (v && src && !/Decrypt Failed/i.test(src) && st.status[st.idx] === 'running') {
            playVideo(v, st.idx, '继续：' + st.items[st.idx].name);
        } else {
            processItem(st.idx);
        }
    }

    function onPause() {
        var st = ENGINE.st;
        if (!st) return;
        st.running = false;
        saveStateNow();
        clearWatch();
        try {
            var w = ENGINE.stage && ENGINE.stage.contentWindow;
            var v = w && w.document.querySelector('video');
            if (v) v.pause();
        } catch (e) {}
        addLog('⏸ 已暂停');
        updateSummary();
    }

    function onReset() {
        clearWatch();
        ENGINE.token++;
        neutralizeFrame();
        if (ENGINE.stage) {
            try { ENGINE.stage.src = 'about:blank'; } catch (e) {}
        }
        ENGINE.st = newState(buildQueue());
        saveStateNow();
        renderAll();
        addLog('已重置，全部任务归零');
    }

    /* ---------------- 入口 ---------------- */

    function initCatalog() {
        buildDash();
        var q = buildQueue();
        var st = loadState();
        if (!st || st.v !== 2 || !st.items || st.items.length !== q.length || st.courseKey !== courseKey()) {
            st = newState(q);
        } else {
            st.items = q; // 刷新链接
            if (!st.status || st.status.length !== q.length) st.status = newState(q).status;
            if (!st.progress || st.progress.length !== q.length) st.progress = newState(q).progress;
            if (!st.logs) st.logs = [];
        }
        ENGINE.st = st;
        saveStateNow();
        renderAll();
        if (st.running) {
            addLog('检测到未完成任务，自动继续…');
            runSoon(function () { processItem(st.idx); }, 800);
        }
    }

    if (isCatalog) {
        if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', initCatalog);
        else initCatalog();
    } else {
        var runOnReady = function () { runJumpPage(); };
        if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', runOnReady);
        else runOnReady();
    }
})();