// ==UserScript==
// @name         东财培训自动学习助手
// @namespace    http://tampermonkey.net/
// @version      1.3.2
// @description  课程自动播放助手 - 全自动循环学习
// @author       齐
// @match        *://trahljkj.edufe.cn/*
// @grant        GM_registerMenuCommand
// @grant        GM_addStyle
// @run-at       document-end
// ==/UserScript==

(function () {
    'use strict';

    // =============== 配置 ===============
    var CONFIG = {
        checkInterval: 3000,
        returnDelay: 2000,
        startDelay: 3000,
        completedThreshold: 100,
        popupCheckInterval: 2000,
        allCompletedStopCount: 3,
        heartbeatInterval: 3000,
        pageDetectInterval: 1000,
        resumeRetryDelay: 800,
        panelDefaultWidth: 400,          // 宽度改为 400px
        logMinHeight: 100,
        logMaxHeightRatio: 0.8,
        videoMonitorInterval: 1000,
    };

    // =============== 状态 ===============
    var enabled            = true;
    var allCompletedCount  = 0;
    var currentPageType    = 'unknown';
    var popupRetryCount    = 0;
    var timers = { check: null, scan: null, popup: null, heartbeat: null, pageDetect: null, videoMonitor: null };
    var videoControlInstance = null;
    var panel              = null;
    var isInitialized      = false;
    var pageObserver       = null;
    var lastVideoSrc       = '';
    var lastVideoDuration  = 0;
    var isReinitializing   = false;

    var dash = {
        chapterCompleted: 0,
        chapterTotal: 0,
        chapterTitle: '',
        lastChapterCompleted: 0,
        endedCount: 0,
        autoDetectChapters: true,
    };

    // =============== 工具函数 ===============
    function formatTime(date) {
        var h = String(date.getHours()).padStart(2, '0');
        var m = String(date.getMinutes()).padStart(2, '0');
        var s = String(date.getSeconds()).padStart(2, '0');
        return h + ':' + m + ':' + s;
    }

    function pad2(n) { return String(Math.floor(n)).padStart(2, '0'); }
    function formatDuration(totalSec) {
        if (totalSec <= 0) return '0:00';
        var h = Math.floor(totalSec / 3600);
        var m = Math.floor((totalSec % 3600) / 60);
        var s = Math.floor(totalSec % 60);
        if (h > 0) return h + ':' + pad2(m) + ':' + pad2(s);
        return m + ':' + pad2(s);
    }

    // =============== 面板创建（移除章节进度区域，宽度450） ===============
    var CSS = ''
    + '#dc-panel{position:fixed;top:10px;left:10px;z-index:999999;'
    + 'width:' + CONFIG.panelDefaultWidth + 'px;background:#fff;border:1px solid #d0d7de;border-radius:12px;'
    + 'font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;'
    + 'font-size:13px;color:#333;box-shadow:0 4px 20px rgba(0,0,0,0.1);user-select:none;min-width:400px;}\n'
    + '#dc-panel *{box-sizing:border-box;margin:0;padding:0;}\n'
    + '#dc-header{cursor:move;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;'
    + 'border-bottom:1px solid #d0d7de;background:#f6f8fa;border-radius:12px 12px 0 0;}\n'
    + '#dc-title{font-size:14px;font-weight:600;color:#24292f;}\n'
    + '#dc-status{padding:2px 10px;border-radius:10px;font-size:11px;font-weight:600;letter-spacing:0.5px;}\n'
    + '#dc-status.playing{background:#dafbe1;color:#1a7f37;}\n'
    + '#dc-status.paused{background:#ffebe9;color:#cf222e;}\n'
    + '#dc-status.stopped{background:#f0f0f0;color:#656d76;}\n'
    + '#dc-body{padding:12px 16px 8px;}\n'
    + '.dc-section{margin-bottom:10px;}\n'
    + '.dc-section-title{font-size:11px;color:#656d76;text-transform:uppercase;letter-spacing:1px;margin-bottom:6px;'
    + 'display:flex;align-items:center;gap:6px;}\n'
    + '.dc-section-title::after{content:"";flex:1;height:1px;background:#d0d7de;}\n'
    + '#dc-progress-bar{height:8px;background:#e8eaed;border-radius:4px;overflow:hidden;margin-bottom:8px;}\n'
    + '#dc-progress-fill{height:100%;background:linear-gradient(90deg,#2da44e,#4ac26b);border-radius:4px;'
    + 'transition:width 0.5s ease;width:0%;}\n'
    + '#dc-progress-fill.done{background:linear-gradient(90deg,#1f6feb,#58a6ff);}\n'
    + '#dc-time-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px;}\n'
    + '#dc-current-time{font-size:22px;font-weight:700;color:#24292f;font-variant-numeric:tabular-nums;}\n'
    + '#dc-total-time{font-size:22px;font-weight:400;color:#8c959f;font-variant-numeric:tabular-nums;}\n'
    + '#dc-eta{font-size:12px;color:#656d76;text-align:right;}\n'
    + '#dc-eta span{color:#8250df;font-weight:500;}\n'
    + '#dc-eta.done span{color:#1a7f37;}\n'
    + '#dc-log{max-height:500px;overflow-y:auto;font-size:14px;line-height:1.8;color:#333;'
    + 'padding:10px 12px;background:#fff;border:1px solid #d0d7de;border-radius:8px;}\n'
    + '#dc-log .log-row{display:flex;gap:8px;align-items:flex-start;padding:2px 0;}\n'
    + '#dc-log .log-row:hover{background:#f0f6fc;border-radius:3px;}\n'
    + '#dc-log .log-time{color:#57606a;flex-shrink:0;font-size:13px;font-variant-numeric:tabular-nums;white-space:nowrap;}\n'
    + '#dc-log .log-icon{flex-shrink:0;}\n'
    + '#dc-log .log-msg{color:#24292f;word-break:break-all;font-weight:500;}\n'
    + '#dc-log::-webkit-scrollbar{width:7px;}\n'
    + '#dc-log::-webkit-scrollbar-thumb{background:#d0d7de;border-radius:4px;}\n'
    + '#dc-log::-webkit-scrollbar-track{background:#f6f8fa;}\n'
    + '#dc-resize-handle{position:absolute;right:0;top:0;bottom:0;width:8px;cursor:ew-resize;z-index:10;}\n'
    + '#dc-resize-handle:hover{background:rgba(31,111,235,0.1);}\n'
    + '#dc-resize-vertical{height:8px;cursor:ns-resize;background:transparent;border-top:1px solid #d0d7de;'
    + 'border-radius:0 0 12px 12px;transition:background 0.15s;}\n'
    + '#dc-resize-vertical:hover{background:rgba(31,111,235,0.1);}\n'
    + '#dc-toggle-btn{cursor:pointer;padding:2px 8px;border-radius:4px;background:#f0f0f0;'
    + 'font-size:13px;color:#656d76;line-height:1.4;border:none;}\n'
    + '#dc-toggle-btn:hover{background:#ddf4ff;color:#1f6feb;}\n';

    function createPanel() {
        if (document.getElementById('dc-panel')) return;
        GM_addStyle(CSS);
        var div = document.createElement('div');
        div.id = 'dc-panel';
        div.innerHTML =
            '<div id="dc-resize-handle"></div>' +
            '<div id="dc-header">' +
            '<span id="dc-title">🎓 东北财经在线教育学习助手 by齐</span>' +
            '<span id="dc-status" class="stopped">⏳ 就绪</span>' +
            '<button id="dc-toggle-btn">−</button>' +
            '</div>' +
            '<div id="dc-body">' +
            '<div class="dc-section">' +
            '<div class="dc-section-title">📊 视频播放进度</div>' +
            '<div id="dc-progress-bar"><div id="dc-progress-fill"></div></div>' +
            '<div id="dc-time-row">' +
            '<span id="dc-current-time">--:--</span>' +
            '<span id="dc-total-time">--:--</span>' +
            '</div>' +
            '<div id="dc-eta">⏰ 预计 <span>--:--</span> 结束</div>' +
            '</div>' +
            '<div class="dc-section">' +
            '<div class="dc-section-title">📋 事件日志</div>' +
            '<div id="dc-log"><span style="color:#57606a;font-size:14px;">等待启动...</span></div>' +
            '</div>' +
            '</div>' +
            '<div id="dc-resize-vertical"></div>';
        document.body.appendChild(div);

        // 宽度拖拽
        var resizeHandle = div.querySelector('#dc-resize-handle');
        var resizing = false, resizeStartX = 0, resizeStartW = 0;
        resizeHandle.addEventListener('mousedown', function (e) {
            e.preventDefault();
            e.stopPropagation();
            resizing = true;
            resizeStartX = e.clientX;
            resizeStartW = div.offsetWidth;
            div.style.transition = 'none';
            document.body.style.cursor = 'ew-resize';
            function onResizeMove(ev) {
                if (!resizing) return;
                var newW = resizeStartW + (ev.clientX - resizeStartX);
                newW = Math.max(400, Math.min(newW, window.innerWidth - 20));
                div.style.width = newW + 'px';
            }
            function onResizeUp() {
                resizing = false;
                div.style.transition = '';
                document.body.style.cursor = '';
                document.removeEventListener('mousemove', onResizeMove);
                document.removeEventListener('mouseup', onResizeUp);
            }
            document.addEventListener('mousemove', onResizeMove);
            document.addEventListener('mouseup', onResizeUp);
        });

        // 纵向拖拽
        var verticalHandle = div.querySelector('#dc-resize-vertical');
        var logEl = div.querySelector('#dc-log');
        var isVerticalResizing = false;
        var resizeStartY = 0;
        var resizeStartHeight = 0;
        verticalHandle.addEventListener('mousedown', function (e) {
            e.preventDefault();
            e.stopPropagation();
            isVerticalResizing = true;
            resizeStartY = e.clientY;
            var currentMaxH = parseInt(window.getComputedStyle(logEl).maxHeight, 10);
            if (isNaN(currentMaxH) || currentMaxH <= 0) currentMaxH = 500;
            resizeStartHeight = currentMaxH;
            document.body.style.cursor = 'ns-resize';
            function onResizeMove(ev) {
                if (!isVerticalResizing) return;
                var deltaY = ev.clientY - resizeStartY;
                var newHeight = resizeStartHeight + deltaY;
                var minH = CONFIG.logMinHeight;
                var maxH = Math.floor(window.innerHeight * CONFIG.logMaxHeightRatio);
                newHeight = Math.max(minH, Math.min(maxH, newHeight));
                logEl.style.maxHeight = newHeight + 'px';
            }
            function onResizeUp() {
                isVerticalResizing = false;
                document.body.style.cursor = '';
                document.removeEventListener('mousemove', onResizeMove);
                document.removeEventListener('mouseup', onResizeUp);
            }
            document.addEventListener('mousemove', onResizeMove);
            document.addEventListener('mouseup', onResizeUp);
        });

        // 拖动标题
        var header = div.querySelector('#dc-header');
        var toggleBtn = div.querySelector('#dc-toggle-btn');
        var body = div.querySelector('#dc-body');
        var isDragging = false, dragX = 0, dragY = 0;
        toggleBtn.addEventListener('click', function (e) {
            e.stopPropagation();
            var hide = body.style.display !== 'none';
            body.style.display = hide ? 'none' : 'block';
            toggleBtn.textContent = hide ? '□' : '−';
        });
        header.addEventListener('mousedown', function (e) {
            if (e.target === toggleBtn || e.target === resizeHandle || e.target === verticalHandle) return;
            isDragging = true;
            var rect = div.getBoundingClientRect();
            dragX = e.clientX - rect.left;
            dragY = e.clientY - rect.top;
            div.style.opacity = '0.85';
            function onMove(ev) {
                if (!isDragging) return;
                var x = ev.clientX - dragX;
                var y = ev.clientY - dragY;
                div.style.left = Math.max(0, Math.min(x, window.innerWidth - div.offsetWidth)) + 'px';
                div.style.top = Math.max(0, Math.min(y, window.innerHeight - 30)) + 'px';
            }
            function onUp() {
                isDragging = false;
                div.style.opacity = '1';
                document.removeEventListener('mousemove', onMove);
                document.removeEventListener('mouseup', onUp);
            }
            document.addEventListener('mousemove', onMove);
            document.addEventListener('mouseup', onUp);
        });
        panel = div;
    }

    // =============== 仪表盘更新函数 ===============
    function setStatus(el, cls, text) {
        if (!el) return;
        el.className = cls;
        el.textContent = text;
    }
    function trimLog(logEl) {
        if (!logEl) return;
        var rows = logEl.querySelectorAll('.log-row');
        while (rows.length > 30) {
            rows[0].parentNode.removeChild(rows[0]);
            rows = logEl.querySelectorAll('.log-row');
        }
    }
    function dashLog(icon, msg) {
        var logEl = document.querySelector('#dc-log');
        if (!logEl) return;
        var time = formatTime(new Date());
        var row = document.createElement('div');
        row.className = 'log-row';
        row.innerHTML = '<span class="log-time">' + time + '</span>' +
                        '<span class="log-icon">' + icon + '</span>' +
                        '<span class="log-msg">' + msg + '</span>';
        if (logEl.firstChild && logEl.firstChild.tagName === 'SPAN') logEl.innerHTML = '';
        logEl.appendChild(row);
        trimLog(logEl);
        logEl.scrollTop = logEl.scrollHeight;
    }
    function dashLogNoTime(icon, msg) {
        var logEl = document.querySelector('#dc-log');
        if (!logEl) return;
        var row = document.createElement('div');
        row.className = 'log-row';
        row.innerHTML = '<span class="log-time" style="visibility:hidden;">00:00:00</span>' +
                        '<span class="log-icon">' + icon + '</span>' +
                        '<span class="log-msg">' + msg + '</span>';
        if (logEl.firstChild && logEl.firstChild.tagName === 'SPAN') logEl.innerHTML = '';
        logEl.appendChild(row);
        trimLog(logEl);
        logEl.scrollTop = logEl.scrollHeight;
    }

    function updateProgress(currentSec, durationSec, paused) {
        var pct = durationSec > 0 ? Math.min(100, Math.round(currentSec / durationSec * 100)) : 0;
        var fill = document.querySelector('#dc-progress-fill');
        var curEl = document.querySelector('#dc-current-time');
        var totEl = document.querySelector('#dc-total-time');
        var statusEl = document.querySelector('#dc-status');
        var etaEl = document.querySelector('#dc-eta');
        var etaSpan = document.querySelector('#dc-eta span');
        if (fill) {
            fill.style.width = pct + '%';
            fill.className = (pct >= 100) ? 'done' : '';
        }
        if (curEl) curEl.textContent = formatDuration(currentSec);
        if (totEl) totEl.textContent = formatDuration(durationSec);
        if (pct >= 100) {
            setStatus(statusEl, 'stopped', '✅ 已完成');
        } else if (paused) {
            setStatus(statusEl, 'paused', '⏸ 暂停中');
        } else {
            setStatus(statusEl, 'playing', '▶ 播放中');
        }
        if (etaEl && etaSpan) {
            if (pct >= 100) {
                etaEl.className = 'done';
                etaSpan.textContent = '已完成';
            } else if (durationSec > 0 && currentSec > 0 && !paused) {
                var remainingSec = Math.max(0, durationSec - currentSec);
                var etaDate = new Date(Date.now() + remainingSec * 1000);
                var etaH = etaDate.getHours();
                var etaM = String(etaDate.getMinutes()).padStart(2, '0');
                etaSpan.textContent = etaH + ':' + etaM;
                etaEl.className = '';
            } else if (paused) {
                etaSpan.textContent = '已暂停';
                etaEl.className = '';
            } else {
                etaSpan.textContent = '--:--';
                etaEl.className = '';
            }
        }
    }

    // 章节信息仅通过日志输出，不更新DOM
    function updateChapterInfo(completed, total, title, silent) {
        if (!silent) {
            var prev = dash.lastChapterCompleted;
            if (completed > prev && prev > 0) {
                dashLog('✅', '第' + prev + '个章节播放完毕');
            }
            if (completed > prev && prev === 0 && completed > 0) {
                dashLog('✅', '第' + completed + '个章节播放完毕');
            }
        }
        dash.lastChapterCompleted = completed;
        dash.chapterCompleted = completed;
        dash.chapterTotal = total;
        dash.chapterTitle = title;
    }

    // =============== 页面类型识别 ===============
    function detectPageType() {
        var hasLearnBtn = false;
        var btns = document.querySelectorAll('button');
        for (var i = 0; i < btns.length; i++) {
            if (btns[i].textContent.trim() === '学习') { hasLearnBtn = true; break; }
        }
        var hasVideo = !!document.querySelector('video');
        if (hasLearnBtn) return 'list';
        if (hasVideo) return 'play';
        return 'unknown';
    }
    function findChapterTitle() {
        var sels = ['h1', 'h2', 'h3', '.title', '[class*="title"]', '[class*="chapter-name"]', '[class*="video-title"]'];
        for (var i = 0; i < sels.length; i++) {
            var el = document.querySelector(sels[i]);
            if (el && el.textContent.trim().length > 2 && el.textContent.trim().length < 200) {
                return el.textContent.trim();
            }
        }
        var items = document.querySelectorAll('.active, .current, [class*="active"], [class*="current"], [class*="playing"]');
        for (var j = 0; j < items.length; j++) {
            var t = items[j].textContent.trim();
            if (t.length > 2 && t.length < 200 && !/已完成|已学/.test(t)) return t;
        }
        return '';
    }
    function tryCountTotalFromDOM() {
        var allDivs = document.querySelectorAll('div');
        var bestDiv = null;
        var bestCount = 0;
        for (var i = 0; i < allDivs.length; i++) {
            var d = allDivs[i];
            var txt = d.textContent;
            var m = txt.match(/(\d+)\s*\/\s*(\d+)/);
            if (m && parseInt(m[2]) > parseInt(m[1])) {
                var children = d.querySelectorAll('li, [class*="item"], [class*="chapter"]');
                if (children.length >= 2 && children.length > bestCount) {
                    bestDiv = d;
                    bestCount = children.length;
                }
            }
        }
        if (bestCount >= 2) return bestCount;
        for (var j = 0; j < allDivs.length; j++) {
            var div = allDivs[j];
            var items = div.querySelectorAll('li, [class*="item"], [class*="chapter"]');
            if (items.length >= 2) {
                var doneCount = 0;
                for (var k = 0; k < items.length; k++) {
                    var itemText = items[k].textContent;
                    if (itemText.indexOf('已完成') !== -1 || itemText.indexOf('已学') !== -1 ||
                        /completed|done|finish/i.test(items[k].className || '')) {
                        doneCount++;
                    }
                }
                if (doneCount > 0 && items.length > bestCount) {
                    bestCount = items.length;
                }
            }
        }
        return bestCount >= 2 ? bestCount : 0;
    }

    // =============== 列表页功能 ===============
    function findCourseCards() {
        var cards = [];
        var btns = document.querySelectorAll('button');
        btns.forEach(function (btn) {
            if (btn.textContent.trim() === '学习') {
                var card = btn.closest('div[class*="course"], div[class*="item"], li, div[class*="card"]') || btn.parentElement;
                cards.push({ button: btn, card: card });
            }
        });
        return cards;
    }
    function extractCourseInfo(cardData) {
        var card = cardData.card;
        var progress = 0, title = '';
        var pEl = card.querySelector('[class*="progress"] span, [class*="schedule"] span, [class*="percent"]');
        if (pEl) { var m = pEl.textContent.match(/(\d+(?:\.\d+)?)%/); if (m) progress = parseFloat(m[1]); }
        if (progress === 0) {
            card.querySelectorAll('span').forEach(function (sp) {
                if (/^\d+(?:\.\d+)?%$/.test(sp.textContent.trim())) progress = parseFloat(sp.textContent.trim());
            });
        }
        if (progress === 0) {
            var el = card.querySelector('[data-progress], [data-schedule]');
            if (el) { var v = el.getAttribute('data-progress') || el.getAttribute('data-schedule'); if (v) progress = parseFloat(v); }
        }
        if (progress === 0) {
            var m2 = card.textContent.match(/(\d+(?:\.\d+)?)%/); if (m2) progress = parseFloat(m2[1]);
        }
        var h3 = card.querySelector('h3, h2, .title, [class*="title"]');
        if (h3) title = h3.textContent.trim();
        if (!title) {
            card.querySelectorAll('div').forEach(function (d) {
                var t = d.textContent.trim();
                if (t.length > 5 && t.length < 150 && t.indexOf('%') === -1) title = t;
            });
        }
        if (!title) title = card.textContent.substring(0, 60).trim();
        return { button: cardData.button, card: card, progress: progress, title: title };
    }
    function scanAndEnterCourse() {
        if (!enabled) return;
        var cards = findCourseCards();
        if (cards.length === 0) { allCompletedCount = 0; return; }
        var courses = cards.map(extractCourseInfo);
        var allCompleted = true;
        for (var i = 0; i < courses.length; i++) {
            if (courses[i].progress < CONFIG.completedThreshold) { allCompleted = false; break; }
        }
        if (allCompleted) {
            allCompletedCount++;
            if (allCompletedCount >= CONFIG.allCompletedStopCount) {
                dashLog('✅', '所有课程已完成，停止巡检');
                enabled = false;
                setStatus(document.querySelector('#dc-status'), 'stopped', '✅ 全部完成');
                if (timers.scan) { clearInterval(timers.scan); timers.scan = null; }
            }
            return;
        }
        allCompletedCount = 0;
        for (var j = 0; j < courses.length; j++) {
            if (courses[j].progress < CONFIG.completedThreshold) {
                dashLog('🎯', '进入课程: ' + courses[j].title + ' (' + courses[j].progress + '%)');
                courses[j].button.click();
                return;
            }
        }
    }

    // =============== 章节完成检测 ===============
    function checkChapterCompletion() {
        if (!enabled) return;
        var completed = 0, total = 0;
        var targetList = null;
        var lists = document.querySelectorAll('ul, ol, div[class*="chapter-list"], div[class*="section-list"]');
        for (var i = 0; i < lists.length; i++) {
            var items = lists[i].querySelectorAll('li, div[class*="chapter-item"], div[class*="section-item"]');
            if (items.length >= 2) {
                var hasStatus = false;
                for (var t = 0; t < items.length; t++) {
                    if (items[t].querySelector('svg, i, [class*="icon"]') ||
                        items[t].textContent.indexOf('已完成') !== -1 ||
                        items[t].textContent.indexOf('已学') !== -1) { hasStatus = true; break; }
                }
                if (hasStatus) { targetList = lists[i]; break; }
            }
        }
        if (!targetList) {
            var divs = document.querySelectorAll('div');
            for (var k = 0; k < divs.length; k++) {
                if (divs[k].textContent.indexOf('已完成') !== -1 && divs[k].children.length > 1) {
                    targetList = divs[k]; break;
                }
            }
        }
        if (targetList) {
            var items = targetList.querySelectorAll('li, div[class*="chapter-item"], div[class*="section-item"], div[class*="item"]');
            if (items.length >= 1) {
                total = items.length;
                items.forEach(function (item) {
                    var greenSvg = item.querySelector('svg path[fill="#52c41a"], svg path[fill="#27ae60"], svg path[fill="#10b981"]');
                    var hasText = item.textContent.indexOf('已完成') !== -1 || item.textContent.indexOf('已学') !== -1;
                    var cls = item.className || '';
                    var hasCls = /completed|done|finish|checked/i.test(cls);
                    var aria = item.getAttribute('aria-checked') || item.getAttribute('data-status') || item.getAttribute('aria-selected');
                    var isAttr = (aria === 'true' || aria === 'completed' || aria === 'finished' || aria === 'selected');
                    var ds = item.getAttribute('data-status');
                    var isDs = ds && ['finished','completed','done'].indexOf(ds.toLowerCase()) !== -1;
                    if (greenSvg || hasText || hasCls || isAttr || isDs) completed++;
                });
            }
        }
        if (total === 0) {
            total = tryCountTotalFromDOM();
        }
        if (total === 0) {
            completed = dash.endedCount;
            total = 0;
        } else {
            if (dash.endedCount > completed) {
                completed = dash.endedCount;
                if (completed > total) completed = total;
            }
        }
        var chTitle = findChapterTitle();
        updateChapterInfo(completed, total, chTitle);
        if (total > 0 && completed >= total) {
            dashLog('📖', '所有章节已完成，等待评价弹窗...');
            if (timers.check) { clearInterval(timers.check); timers.check = null; }
        }
    }

    // =============== 弹窗检测 ===============
    function checkAndHandlePopup() {
        if (!enabled) return;
        var modal = null;
        var sels = ['.el-dialog', '.ant-modal', '.modal', '.dialog', 'div[role="dialog"]', 'div[class*="popup"]', 'div[class*="modal"]'];
        for (var s = 0; s < sels.length; s++) {
            var el = document.querySelector(sels[s]);
            if (el && (el.textContent.indexOf('评价') !== -1 || el.textContent.indexOf('评分') !== -1)) { modal = el; break; }
        }
        if (!modal) {
            var allDivs = document.querySelectorAll('div');
            for (var d = 0; d < allDivs.length; d++) {
                var t = allDivs[d].textContent;
                if (t.indexOf('请您对该课程进行评价') !== -1 || t.indexOf('课程评价') !== -1) { modal = allDivs[d]; break; }
            }
        }
        if (!modal) { popupRetryCount = 0; return; }
        var btns = modal.querySelectorAll('button');
        for (var b = 0; b < btns.length; b++) {
            var text = btns[b].textContent.trim();
            if (/^(好的|确定|确认|OK|是|我知道了)$/i.test(text)) {
                dashLog('💬', '自动关闭评价弹窗 (点击"' + text + '")');
                btns[b].click();
                dashLogNoTime('🔙', '2秒后返回列表页...');
                setTimeout(function () { goBack(); }, CONFIG.returnDelay);
                if (timers.popup) { clearInterval(timers.popup); timers.popup = null; }
                popupRetryCount = 0;
                return;
            }
        }
        if (btns.length > 0) {
            dashLog('💬', '尝试点击弹窗按钮...');
            btns[0].click();
            setTimeout(function () { goBack(); }, CONFIG.returnDelay);
            if (timers.popup) { clearInterval(timers.popup); timers.popup = null; }
            popupRetryCount = 0;
            return;
        }
        popupRetryCount++;
        if (popupRetryCount >= 10) {
            dashLog('⚠️', '弹窗按钮不可用，强制返回');
            goBack();
            if (timers.popup) { clearInterval(timers.popup); timers.popup = null; }
            popupRetryCount = 0;
        }
    }
    function goBack() {
        var sels = ['a[href*="plan"]', 'a[href*="return"]', 'a[class*="back"]', 'button[class*="back"]', '[class*="back-btn"]'];
        for (var i = 0; i < sels.length; i++) {
            var el = document.querySelector(sels[i]);
            if (el) { el.click(); return; }
        }
        var links = document.querySelectorAll('nav a, header a, .breadcrumb a');
        for (var j = 0; j < links.length; j++) {
            if (/返回|计划|列表/i.test(links[j].textContent)) { links[j].click(); return; }
        }
        if (window.history.length > 1) window.history.back();
    }

    // =============== 视频控制 ===============
    function setupVideoControl() {
        var video = document.querySelector('video');
        if (!video) { dashLog('⚠️', '未找到视频元素'); return null; }

        var destroyed       = false;
        var userInteracted  = false;
        var playStartTime   = null;
        var totalPlayTime   = 0;
        var lastDashUpdate  = 0;
        var lastDuration    = 0;

        var control = {
            video: video,
            eventListeners: [],
            heartbeatTimer: null,
            visibilityHandler: null,

            init: function () {
                dash.chapterCompleted = 0;
                dash.chapterTotal = 0;
                dash.lastChapterCompleted = 0;

                var dur = video.duration || 0;
                var cur = video.currentTime || 0;
                updateProgress(cur, dur, video.paused);

                var chTitle = findChapterTitle();
                if (chTitle) dash.chapterTitle = chTitle;
                updateChapterInfo(dash.endedCount, 0, dash.chapterTitle, true);

                dashLog('🎬', '视频就绪 | 总时长 ' + formatDuration(dur || 0));

                var playHandler = function () {
                    if (destroyed) return;
                    playStartTime = Date.now();
                    window.__dcPlayStart = Date.now();
                    lastDashUpdate = 0;
                    if (!userInteracted) {
                        dashLog('▶️', '开始播放' + (video.currentTime > 0 ? ' (从 ' + formatDuration(video.currentTime) + ' 处恢复)' : ''));
                    }
                    userInteracted = true;
                    updateProgress(video.currentTime, video.duration, false);
                };

                var pauseHandler = function () {
                    if (destroyed || !enabled) return;
                    if (video.ended) return;
                    var now = Date.now();
                    if (playStartTime) { totalPlayTime += (now - playStartTime) / 1000; playStartTime = null; }
                    updateProgress(video.currentTime, video.duration, true);
                    dashLogNoTime('⏸', '视频暂停 (' + formatDuration(video.currentTime) + ' / ' + formatDuration(video.duration) + ')');
                    setTimeout(function () {
                        if (!destroyed && enabled && !video.ended && video.paused) control.resumeByClick();
                    }, CONFIG.resumeRetryDelay);
                };

                var endedHandler = function () {
                    if (destroyed) return;
                    if (playStartTime) { totalPlayTime += (Date.now() - playStartTime) / 1000; playStartTime = null; }
                    updateProgress(video.duration, video.duration, false);
                    dash.endedCount++;
                    dashLog('🏁', '第' + dash.endedCount + '个章节播放完毕 | 时长 ' + formatDuration(totalPlayTime));
                    totalPlayTime = 0;
                    if (dash.chapterTotal === 0) {
                        updateChapterInfo(dash.endedCount, 0, dash.chapterTitle);
                    }
                    setTimeout(function () { checkChapterCompletion(); }, 500);
                };

                var timeupdateHandler = function () {
                    if (destroyed) return;
                    var now = Date.now();
                    if (now - lastDashUpdate > 1500) {
                        lastDashUpdate = now;
                        updateProgress(video.currentTime, video.duration, video.paused);
                    }
                    if (video.duration > 0 && lastDuration === 0) {
                        lastDuration = video.duration;
                        updateProgress(video.currentTime, video.duration, video.paused);
                        dashLog('🎬', '视频元数据加载完成 | 总时长 ' + formatDuration(video.duration));
                    }
                };

                video.addEventListener('play',       playHandler);
                video.addEventListener('pause',      pauseHandler);
                video.addEventListener('ended',      endedHandler);
                video.addEventListener('timeupdate', timeupdateHandler);
                control.eventListeners.push({ event: 'play', handler: playHandler });
                control.eventListeners.push({ event: 'pause', handler: pauseHandler });
                control.eventListeners.push({ event: 'ended', handler: endedHandler });
                control.eventListeners.push({ event: 'timeupdate', handler: timeupdateHandler });

                var clickHandler = function () { if (!userInteracted) userInteracted = true; };
                document.addEventListener('click', clickHandler, true);
                control.eventListeners.push({ event: 'click', handler: clickHandler, capture: true, target: document });

                control.visibilityHandler = function () {
                    if (destroyed || !enabled) return;
                    if (!document.hidden) {
                        setTimeout(function () {
                            if (!destroyed && enabled && !video.ended && video.paused && userInteracted)
                                control.resumeByClick(true);
                        }, 600);
                    }
                };
                document.addEventListener('visibilitychange', control.visibilityHandler);

                control.heartbeatTimer = setInterval(function () {
                    if (destroyed || !enabled) return;
                    if (video.paused && !video.ended && userInteracted) {
                        video.muted = true;
                        control.simulateClick();
                        video.play().catch(function () {});
                    }
                    if (!video.paused) updateProgress(video.currentTime, video.duration, false);
                }, CONFIG.heartbeatInterval);

                setTimeout(function () {
                    if (!destroyed && enabled && video.paused && !video.ended) {
                        video.muted = true;
                        control.simulateClick();
                        video.play().catch(function () {});
                    }
                }, 1500);

                setStatus(document.querySelector('#dc-status'), 'playing', '▶ 播放中');
            },

            simulateClick: function () {
                try {
                    var rect = video.getBoundingClientRect();
                    var cx = rect.left + rect.width / 2;
                    var cy = rect.top + rect.height / 2;
                    ['mouseenter', 'mouseover', 'mousedown', 'mouseup', 'click'].forEach(function (type) {
                        video.dispatchEvent(new MouseEvent(type, {
                            bubbles: true, cancelable: true, view: window,
                            clientX: cx, clientY: cy, button: 0
                        }));
                    });
                    var touch = new Touch({
                        identifier: Date.now(), target: video,
                        clientX: cx, clientY: cy, pageX: cx, pageY: cy,
                        radiusX: 1, radiusY: 1, rotationAngle: 0, force: 1
                    });
                    video.dispatchEvent(new TouchEvent('touchstart', {
                        bubbles: true, cancelable: true, view: window,
                        touches: [touch], targetTouches: [touch], changedTouches: [touch]
                    }));
                    video.dispatchEvent(new TouchEvent('touchend', {
                        bubbles: true, cancelable: true, view: window,
                        touches: [], targetTouches: [], changedTouches: [touch]
                    }));
                } catch (e) {}
            },

            resumeByClick: function (silent) {
                if (destroyed || !enabled) return;
                var v = this.video;
                if (!v || v.ended || !v.paused) return;
                if (document.hidden && !userInteracted) return;
                v.muted = true;
                this.simulateClick();
                var self = this;
                v.play().then(function () {
                    if (!silent) dashLogNoTime('▶️', '恢复播放成功');
                    if (!playStartTime) playStartTime = Date.now();
                    updateProgress(v.currentTime, v.duration, false);
                }).catch(function (e) {
                    if (e.name === 'NotAllowedError') {
                        self.simulateClick();
                        v.play().catch(function () {});
                    }
                });
            },

            destroy: function () {
                destroyed = true;
                if (playStartTime && !video.ended) { totalPlayTime += (Date.now() - playStartTime) / 1000; playStartTime = null; }
                if (this.heartbeatTimer)   { clearInterval(this.heartbeatTimer); this.heartbeatTimer = null; }
                if (this.visibilityHandler) { document.removeEventListener('visibilitychange', this.visibilityHandler); this.visibilityHandler = null; }
                this.eventListeners.forEach(function (item) {
                    (item.target || video).removeEventListener(item.event, item.handler, item.capture || false);
                });
                this.eventListeners = [];
                dash.chapterCompleted = 0;
                dash.chapterTotal = 0;
                dash.lastChapterCompleted = 0;
            }
        };

        control.init();
        return control;
    }

    // =============== 页面切换调度 ===============
    function onPageTypeChange(newType, force) {
        if (!force && newType === currentPageType && isInitialized) return;

        clearAllTimers();
        currentPageType = newType;
        popupRetryCount = 0;

        if (!enabled) return;

        if (newType === 'list') {
            dashLog('📋', '进入列表页，启动课程扫描');
            setStatus(document.querySelector('#dc-status'), 'stopped', '📋 列表页');
            updateProgress(0, 0, true);
            setTimeout(function () {
                if (currentPageType === 'list' && enabled) {
                    scanAndEnterCourse();
                    timers.scan = setInterval(scanAndEnterCourse, 10000);
                }
            }, CONFIG.startDelay);
        } else if (newType === 'play') {
            var video = document.querySelector('video');
            if (video) {
                lastVideoSrc = video.src || video.getAttribute('src') || '';
                lastVideoDuration = video.duration || 0;
            }
            dashLog('🎬', '进入播放页');
            videoControlInstance = setupVideoControl();
            timers.check = setInterval(checkChapterCompletion, CONFIG.checkInterval);
            timers.popup = setInterval(checkAndHandlePopup, CONFIG.popupCheckInterval);
            if (timers.videoMonitor) clearInterval(timers.videoMonitor);
            timers.videoMonitor = setInterval(function () {
                if (!enabled || currentPageType !== 'play') return;
                var v = document.querySelector('video');
                if (!v) return;
                var currentSrc = v.src || v.getAttribute('src') || '';
                var currentDuration = v.duration || 0;
                if ((currentSrc && currentSrc !== lastVideoSrc) ||
                    (currentDuration > 0 && currentDuration !== lastVideoDuration)) {
                    lastVideoSrc = currentSrc;
                    lastVideoDuration = currentDuration;
                    updateProgress(v.currentTime || 0, currentDuration, v.paused);
                    if (!isReinitializing) {
                        isReinitializing = true;
                        dashLog('🔄', '检测到视频源/时长变化，重新初始化...');
                        if (videoControlInstance) {
                            videoControlInstance.destroy();
                            videoControlInstance = null;
                        }
                        videoControlInstance = setupVideoControl();
                        setTimeout(function () { isReinitializing = false; }, 500);
                    }
                }
            }, CONFIG.videoMonitorInterval);

            setTimeout(function () { checkChapterCompletion(); checkAndHandlePopup(); }, 1500);
        }
    }

    // =============== 页面检测 ===============
    function startPageDetection() {
        var lastUrl = location.href;

        function checkPage() {
            var newUrl = location.href;
            if (newUrl !== lastUrl) {
                lastUrl = newUrl;
                onPageTypeChange(detectPageType());
            } else {
                var type = detectPageType();
                if (type !== currentPageType) {
                    onPageTypeChange(type);
                } else if (type === 'play') {
                    var currentVideo = document.querySelector('video');
                    if (currentVideo) {
                        if (videoControlInstance && videoControlInstance.video !== currentVideo) {
                            onPageTypeChange('play', true);
                        }
                    }
                }
            }
        }

        window.addEventListener('popstate',  checkPage);
        window.addEventListener('hashchange', checkPage);
        timers.pageDetect = setInterval(checkPage, CONFIG.pageDetectInterval);

        pageObserver = new MutationObserver(function () {
            if (pageObserver._debounce) clearTimeout(pageObserver._debounce);
            pageObserver._debounce = setTimeout(function () {
                checkPage();
                pageObserver._debounce = null;
            }, 300);
        });
        pageObserver.observe(document.body, { childList: true, subtree: true, attributes: false });

        setTimeout(function () {
            onPageTypeChange(detectPageType());
            isInitialized = true;
        }, 1500);
    }

    function clearAllTimers() {
        Object.keys(timers).forEach(function (key) {
            if (timers[key]) { clearInterval(timers[key]); clearTimeout(timers[key]); timers[key] = null; }
        });
        if (videoControlInstance) { videoControlInstance.destroy(); videoControlInstance = null; }
        if (pageObserver) { pageObserver.disconnect(); pageObserver = null; }
    }

    // =============== 菜单 ===============
    function registerMenuCommands() {
        GM_registerMenuCommand('🔍 扫描未完成课程', function () {
            if (currentPageType === 'list') scanAndEnterCourse();
            else dashLog('⚠️', '当前不在列表页');
        });
        GM_registerMenuCommand('🔙 返回列表页', function () { goBack(); });
        GM_registerMenuCommand('🔄 重新启用', function () {
            if (!enabled) {
                enabled = true; allCompletedCount = 0; popupRetryCount = 0;
                dashLog('🚀', '已重新启用自动扫描');
                onPageTypeChange(detectPageType());
            } else { dashLog('📌', '脚本已处于启用状态'); }
        });
        GM_registerMenuCommand('⏯️ 切换启用', function () {
            enabled = !enabled;
            if (!enabled) {
                clearAllTimers();
                setStatus(document.querySelector('#dc-status'), 'stopped', '⏸ 已禁用');
                dashLog('⚠️', '脚本已禁用');
            } else {
                allCompletedCount = 0; popupRetryCount = 0;
                dashLog('🚀', '脚本已启用');
                onPageTypeChange(detectPageType());
            }
        });
    }

    // =============== 初始化 ===============
    function init() {
        createPanel();
        registerMenuCommands();
        dashLog('🚀', '东北财经在线教育学习助手 by齐 初始化完成');
        startPageDetection();
    }

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

})();