// ==UserScript==
// @name         AES云上授课助手
// @namespace    https://scriptcat.org/
// @version      1.0.110-Release
// @description  AES云上授课助手1.0.110正式版 - 针对出头科技云上教学系统的自动刷课脚本，修复反暂停、倍速锁定、CSP拦截等问题
// @Tag          网课自动化
// @author       绫白
// @match        https://csjs.web2.superchutou.com/*
// @match        https://*.superchutou.com/*
// @grant        GM_notification
// @grant        GM_log
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @grant        GM_addStyle
// @run-at       document-end
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    // ==================== 配置项 ====================
    const CONFIG = {
        playbackRate: 1.5,
        autoMute: true,
        enableBackgroundPlay: true,
        checkInterval: 2000,
        startWaitTime: 2000,
        nextVideoDelay: 2000,
        showNotification: true,
        debug: true
    };

    // ==================== 工具函数 ====================
    function log(message, type = 'info') {
        const prefix = '[AES助手]';
        const timestamp = new Date().toLocaleTimeString();
        const fullMessage = `${prefix} [${timestamp}] ${message}`;
        if (CONFIG.debug) {
            const styles = { info: 'color: #2196F3', success: 'color: #4CAF50', warn: 'color: #FF9800', error: 'color: #F44336' };
            console.log(`%c${fullMessage}`, styles[type] || styles.info);
        }
        GM_log(fullMessage, type);
    }

    function notify(title, text, timeout = 5000) {
        if (CONFIG.showNotification) GM_notification({ title, text, timeout });
        log(`${title}: ${text}`, 'success');
    }

    // ==================== 全局CSS提取 (解决CSP拦截) ====================
    const PANEL_CSS = `
        /* 【调整】全局字体应用汉仪文黑85W，并保留系统字体作为兼容回退 */
        #aes-panel { position: fixed; top: 80px; right: 20px; width: 320px; background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%); border-radius: 16px; box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4); z-index: 999999; font-family: '汉仪文黑85W', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: #fff; overflow: hidden; transition: all 0.3s ease; user-select: none; }
        #aes-panel.collapsed { width: 50px; height: 50px; border-radius: 50%; cursor: pointer; }
        #aes-panel.collapsed .panel-content { display: none; }
        #aes-panel.collapsed .panel-header { padding: 0; justify-content: center; border-radius: 50%; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
        #aes-panel.collapsed .panel-title { display: none; }
        #aes-panel.collapsed .toggle-btn { display: none; }
        #aes-panel.collapsed .collapsed-icon { display: flex !important; }
        .panel-header { background: linear-gradient(90deg, #667eea 0%, #764ba2 100%); padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; cursor: move; }
        .panel-title { font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 6px; }
        .panel-title::before { content: '⚡'; }
        .collapsed-icon { display: none; font-size: 22px; align-items: center; justify-content: center; width: 100%; height: 100%; }
        .toggle-btn { background: rgba(255,255,255,0.2); border: none; color: #fff; width: 24px; height: 24px; border-radius: 8px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; font-size: 16px; line-height: 1; }
        .toggle-btn:hover { background: rgba(255,255,255,0.3); }
        .panel-content { padding: 16px; }
        .status-card { background: rgba(255,255,255,0.08); border-radius: 12px; padding: 12px; margin-bottom: 12px; }
        .status-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
        .status-label { font-size: 12px; color: #888; }
        .status-value { font-size: 13px; font-weight: 500; display: flex; align-items: center; gap: 4px; }
        .status-running { color: #4CAF50; }
        .status-stopped { color: #ff9800; }
        .status-dot { width: 8px; height: 8px; border-radius: 50%; background: #4CAF50; animation: pulse 1.5s infinite; }
        .status-dot.stopped { background: #ff9800; animation: none; }
        @keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
        .progress-bar { height: 6px; background: rgba(255,255,255,0.1); border-radius: 3px; overflow: hidden; margin: 8px 0; }
        .progress-fill { height: 100%; background: linear-gradient(90deg, #4CAF50, #8BC34A); border-radius: 3px; transition: width 0.3s ease; }
        .progress-text { display: flex; justify-content: space-between; font-size: 11px; color: #888; }
        .video-info { background: rgba(255,255,255,0.05); border-radius: 8px; padding: 10px; margin-top: 8px; }
        .video-title { font-size: 13px; font-weight: 500; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .video-index { font-size: 11px; color: #888; }
        .control-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
        .ctrl-btn { background: rgba(255,255,255,0.1); border: none; color: #fff; padding: 10px 6px; border-radius: 10px; cursor: pointer; transition: all 0.2s; font-size: 16px; }
        .ctrl-btn:hover { background: rgba(255,255,255,0.2); transform: translateY(-1px); }
        .ctrl-btn.active { background: linear-gradient(135deg, #4CAF50, #8BC34A); }
        .ctrl-btn:disabled { opacity: 0.5; cursor: not-allowed; }
        .speed-section { margin-bottom: 12px; }
        .speed-header { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 12px; }
        .speed-current { color: #667eea; font-weight: 600; }
        .speed-buttons { display: flex; gap: 6px; }
        .speed-btn { flex: 1; background: rgba(255,255,255,0.1); border: none; color: #fff; padding: 8px 4px; border-radius: 8px; cursor: pointer; font-size: 12px; transition: all 0.2s; }
        .speed-btn:hover { background: rgba(255,255,255,0.2); }
        .speed-btn.active { background: linear-gradient(135deg, #667eea, #764ba2); }
        .stats-row { display: flex; justify-content: space-around; padding: 12px 0; border-top: 1px solid rgba(255,255,255,0.1); }
        .stat-item { text-align: center; }
        .stat-value { font-size: 18px; font-weight: 600; color: #fff; }
        .stat-label { font-size: 10px; color: #888; margin-top: 2px; }
        .stat-value.highlight { color: #4CAF50; }
        .footer-credit { text-align: center; padding: 10px 0 6px; border-top: 1px solid rgba(255,255,255,0.08); margin-top: 8px; }
        .footer-credit-text { font-size: 10px; color: #555; line-height: 1.5; }
        /* 【调整】PowerBy重点显示：更纯正的蓝色，并加粗 */
        .footer-credit-text span { color: #4facfe; font-weight: bold; }
    `;

    // ==================== UI面板类 ====================
    class ControlPanel {
        constructor(manager) {
            this.manager = manager;
            this.panel = null;
            this.isCollapsed = false;
            this.isDragging = false;
            this.dragOffset = { x: 0, y: 0 };
            this.updateTimer = null;
            this.init();
        }

        init() {
            GM_addStyle(PANEL_CSS);
            this.createPanel();
            this.bindEvents();
            this.startUpdate();
            log('控制面板已创建(安全模式)', 'success');
        }

        createPanel() {
            const container = document.createElement('div');
            container.id = 'aes-panel-container';
            container.innerHTML = `
                <div id="aes-panel">
                    <div class="panel-header">
                        <span class="panel-title">AES云上授课助手</span>
                        <span class="collapsed-icon">⚡</span>
                        <button class="toggle-btn" id="toggle-btn">−</button>
                    </div>
                    <div class="panel-content">
                        <div class="status-card">
                            <div class="status-header">
                                <span class="status-label">运行状态</span>
                                <span class="status-value status-running" id="status-text">
                                    <span class="status-dot" id="status-dot"></span>
                                    <span id="status-label">运行中</span>
                                </span>
                            </div>
                            <div class="progress-bar">
                                <div class="progress-fill" id="progress-fill" style="width: 0%"></div>
                            </div>
                            <div class="progress-text">
                                <span id="current-time">00:00</span>
                                <span id="progress-percent">0%</span>
                                <span id="total-time">00:00</span>
                            </div>
                            <div class="video-info">
                                <div class="video-title" id="video-title">加载中...</div>
                                <div class="video-index" id="video-index">第 0/0 个视频</div>
                            </div>
                        </div>
                        <div class="control-grid">
                            <button class="ctrl-btn active" id="btn-play" title="播放/暂停">▶</button>
                            <button class="ctrl-btn" id="btn-prev" title="上一课">⏮</button>
                            <button class="ctrl-btn" id="btn-next" title="下一课">⏭</button>
                            <button class="ctrl-btn" id="btn-mute" title="静音">🔊</button>
                        </div>
                        <div class="speed-section">
                            <div class="speed-header">
                                <span>播放速度</span>
                                <span class="speed-current" id="speed-display">1.5x</span>
                            </div>
                            <div class="speed-buttons">
                                <button class="speed-btn" data-speed="1">1x</button>
                                <button class="speed-btn" data-speed="1.25">1.25x</button>
                                <button class="speed-btn active" data-speed="1.5">1.5x</button>
                                <button class="speed-btn" data-speed="2">2x</button>
                                <button class="speed-btn" data-speed="3">3x</button>
                            </div>
                        </div>
                        <div class="stats-row">
                            <div class="stat-item">
                                <div class="stat-value highlight" id="stat-completed">0</div>
                                <div class="stat-label">已完成</div>
                            </div>
                            <div class="stat-item">
                                <div class="stat-value" id="stat-remaining">0</div>
                                <div class="stat-label">剩余</div>
                            </div>
                            <div class="stat-item">
                                <div class="stat-value" id="stat-percent">0%</div>
                                <div class="stat-label">总进度</div>
                            </div>
                        </div>
                        <div class="footer-credit">
                            <div class="footer-credit-text">由<span>智谱清言</span>与<span>ScriptCat</span>及创作者<span>绫白</span>共同驱动</div>
                        </div>
                    </div>
                </div>
            `;
            document.body.appendChild(container);
            this.panel = document.getElementById('aes-panel');
        }

        bindEvents() {
            document.getElementById('toggle-btn').addEventListener('click', (e) => { e.stopPropagation(); this.toggleCollapse(); });
            this.panel.querySelector('.panel-header').addEventListener('dblclick', () => this.toggleCollapse());
            
            const header = this.panel.querySelector('.panel-header');
            header.addEventListener('mousedown', (e) => {
                if (this.isCollapsed) return;
                this.isDragging = true;
                const rect = this.panel.getBoundingClientRect();
                this.dragOffset.x = e.clientX - rect.left;
                this.dragOffset.y = e.clientY - rect.top;
                this.panel.style.transition = 'none';
            });
            document.addEventListener('mousemove', (e) => {
                if (!this.isDragging) return;
                this.panel.style.left = Math.max(0, e.clientX - this.dragOffset.x) + 'px';
                this.panel.style.top = Math.max(0, e.clientY - this.dragOffset.y) + 'px';
                this.panel.style.right = 'auto';
            });
            document.addEventListener('mouseup', () => { this.isDragging = false; this.panel.style.transition = ''; });

            document.getElementById('btn-play').addEventListener('click', () => this.manager.togglePlay());
            document.getElementById('btn-prev').addEventListener('click', () => this.manager.playPrevVideo());
            document.getElementById('btn-next').addEventListener('click', () => this.manager.playNextVideo());
            document.getElementById('btn-mute').addEventListener('click', () => this.manager.toggleMute());

            document.querySelectorAll('.speed-btn').forEach(btn => {
                btn.addEventListener('click', () => {
                    const speed = parseFloat(btn.dataset.speed);
                    this.manager.setSpeed(speed);
                    this.updateSpeedButtons(speed);
                });
            });
        }

        toggleCollapse() {
            this.isCollapsed = !this.isCollapsed;
            this.panel.classList.toggle('collapsed', this.isCollapsed);
            document.getElementById('toggle-btn').textContent = this.isCollapsed ? '+' : '−';
        }

        updateSpeedButtons(speed) {
            document.querySelectorAll('.speed-btn').forEach(btn => btn.classList.toggle('active', parseFloat(btn.dataset.speed) === speed));
            document.getElementById('speed-display').textContent = speed + 'x';
        }

        startUpdate() { this.updateTimer = setInterval(() => this.updateDisplay(), 500); }

        updateDisplay() {
            const video = this.manager.video;
            if (!video) return;
            const currentTime = video.currentTime || 0;
            const duration = video.duration || 0;
            const progress = duration > 0 ? (currentTime / duration * 100) : 0;
            const isPaused = video.paused;

            const statusDot = document.getElementById('status-dot');
            const statusLabel = document.getElementById('status-label');
            const playBtn = document.getElementById('btn-play');
            
            if (isPaused) {
                statusDot.classList.add('stopped'); statusLabel.textContent = '已暂停'; playBtn.textContent = '▶'; playBtn.classList.remove('active');
            } else {
                statusDot.classList.remove('stopped'); statusLabel.textContent = '运行中'; playBtn.textContent = '⏸'; playBtn.classList.add('active');
            }

            document.getElementById('progress-fill').style.width = progress + '%';
            document.getElementById('current-time').textContent = this.manager.formatTime(currentTime);
            document.getElementById('total-time').textContent = this.manager.formatTime(duration);
            document.getElementById('progress-percent').textContent = progress.toFixed(0) + '%';

            const videoItems = this.manager.getAllVideoItems();
            const currentIndex = this.manager.currentVideoIndex + 1;
            const total = videoItems.length;
            if (videoItems[this.manager.currentVideoIndex]) {
                document.getElementById('video-title').textContent = videoItems[this.manager.currentVideoIndex].textContent?.trim().split('时长')[0] || '';
            }
            document.getElementById('video-index').textContent = `第 ${currentIndex}/${total} 个视频`;
            document.getElementById('stat-completed').textContent = this.manager.currentVideoIndex;
            document.getElementById('stat-remaining').textContent = total - this.manager.currentVideoIndex;
            document.getElementById('stat-percent').textContent = total > 0 ? ((this.manager.currentVideoIndex / total) * 100).toFixed(0) + '%' : '0%';

            const muteBtn = document.getElementById('btn-mute');
            muteBtn.textContent = video.muted ? '🔇' : '🔊';
            muteBtn.classList.toggle('active', video.muted);
        }

        destroy() {
            if (this.updateTimer) clearInterval(this.updateTimer);
            document.getElementById('aes-panel-container')?.remove();
        }
    }

    // ==================== 核心管理类 ====================
    class AutoPlayManager {
        constructor() {
            this.video = null;
            this.isPlaying = false;
            this.isCompleted = false;
            this.checkTimer = null;
            this.currentVideoIndex = -1;
            this.totalVideos = 0;
            this.panel = null;
            this.observer = null; 
            this.init();
        }

        init() {
            log('AES智能云上刷课助手 v1.1 稳定版启动', 'info');
            const savedRate = GM_getValue('playbackRate');
            if (savedRate) CONFIG.playbackRate = savedRate;
            const savedMute = GM_getValue('autoMute');
            if (savedMute !== undefined) CONFIG.autoMute = savedMute;

            this.registerMenuCommands();
            if (CONFIG.enableBackgroundPlay) this.setupAntiPause(); 
            this.setupRouteListener();
            this.panel = new ControlPanel(this);
            this.tryInitPlayer();
        }

        registerMenuCommands() {
            GM_registerMenuCommand('▶️ 开始/暂停', () => this.togglePlay());
            GM_registerMenuCommand('⏭️ 下一课', () => this.playNextVideo());
            GM_registerMenuCommand('📊 查看进度', () => this.showProgress());
        }

        setupAntiPause() {
            try {
                Object.defineProperty(document, 'hidden', { get: () => false, configurable: true });
                Object.defineProperty(document, 'visibilityState', { get: () => 'visible', configurable: true });
            } catch (e) {}

            const forcePlay = () => {
                if (this.video && this.isPlaying && this.video.paused && !this.video.ended) {
                    this.video.play().catch(() => {});
                }
            };

            document.addEventListener('visibilitychange', forcePlay);
            window.addEventListener('blur', forcePlay);
            document.addEventListener('mouseleave', forcePlay);
        }

        setupRouteListener() {
            let lastHash = location.hash;
            window.addEventListener('hashchange', () => {
                if (location.hash !== lastHash) {
                    lastHash = location.hash;
                    log('页面切换: ' + location.hash, 'info');
                    this.onRouteChange();
                }
            });
        }

        onRouteChange() {
            this.isCompleted = false;
            this.isPlaying = false;
            this.currentVideoIndex = -1;
            if (this.checkTimer) { clearInterval(this.checkTimer); this.checkTimer = null; }
            if (this.observer) { this.observer.disconnect(); this.observer = null; } 
            setTimeout(() => {
                this.updateCurrentVideoIndex();
                this.tryInitPlayer();
            }, 2000);
        }

        getAllVideoItems() {
            return Array.from(document.querySelectorAll('ul.ant-list-items > div > a'));
        }

        getCurrentVideoId() {
            const match = location.hash.match(/#\/video\/([^/]+)/);
            return match ? match[1] : null;
        }

        updateCurrentVideoIndex() {
            const videoItems = this.getAllVideoItems();
            const currentId = this.getCurrentVideoId();
            this.totalVideos = videoItems.length;
            if (currentId) {
                videoItems.forEach((item, index) => {
                    if ((item.getAttribute('href') || '').includes(currentId)) this.currentVideoIndex = index;
                });
            }
            log(`当前视频索引: ${this.currentVideoIndex + 1}/${this.totalVideos}`, 'info');
        }

        tryInitPlayer() {
            if (!location.hash.includes('/video/')) return;
            log('正在查找视频播放器...', 'info');

            const findVideo = () => {
                let v = document.querySelector('#CuPlayer video') || document.querySelector('.vjs-tech') || document.querySelector('video');
                if (!v) {
                    try {
                        const iframes = document.querySelectorAll('iframe');
                        for (let iframe of iframes) {
                            if (iframe.contentDocument) {
                                v = iframe.contentDocument.querySelector('video');
                                if (v) break;
                            }
                        }
                    } catch (e) { /* 跨域iframe会报错，忽略 */ }
                }
                return v;
            };

            if (findVideo()) {
                this.video = findVideo();
                this.onPlayerReady();
                return;
            }

            this.observer = new MutationObserver((mutations, obs) => {
                const v = findVideo();
                if (v) {
                    obs.disconnect(); 
                    this.observer = null;
                    this.video = v;
                    this.onPlayerReady();
                }
            });

            this.observer.observe(document.body, {
                childList: true,
                subtree: true
            });

            setTimeout(() => {
                if (this.observer) {
                    this.observer.disconnect();
                    this.observer = null;
                    if (!this.video) log('未找到视频播放器(超时)', 'error');
                }
            }, 15000);
        }

        onPlayerReady() {
            log('视频播放器已就绪', 'success');
            this.updateCurrentVideoIndex();
            this.lockPlaybackRate(this.video); 
            if (CONFIG.autoMute) this.video.muted = true;
            this.setupVideoEvents();
            setTimeout(() => this.startAutoPlay(), CONFIG.startWaitTime);
        }

        lockPlaybackRate(videoElement) {
            try {
                Object.defineProperty(HTMLVideoElement.prototype, 'playbackRate', {
                    get: function() { return this._aes_rate || 1.0; },
                    set: function(val) {
                        if (this._aes_setting) {
                            this._aes_rate = val;
                            this._aes_setting = false;
                        } else {
                            this._aes_rate = CONFIG.playbackRate;
                        }
                        Object.getOwnPropertyDescriptor(HTMLMediaElement.prototype, 'playbackRate').set.call(this, this._aes_rate);
                    },
                    configurable: true
                });
                videoElement._aes_setting = true;
                videoElement.playbackRate = CONFIG.playbackRate;
                log(`已启用倍速防护锁: ${CONFIG.playbackRate}x`, 'success');
            } catch (e) {
                log('倍速防护锁安装失败，启用降级防护', 'warn');
                videoElement.addEventListener('ratechange', () => {
                    if (Math.abs(videoElement.playbackRate - CONFIG.playbackRate) > 0.01) {
                        videoElement.playbackRate = CONFIG.playbackRate;
                    }
                });
                videoElement.playbackRate = CONFIG.playbackRate;
            }
        }

        applyPlaybackRate() {
            if (this.video) {
                this.video._aes_setting = true; 
                this.video.playbackRate = CONFIG.playbackRate;
            }
        }

        setupVideoEvents() {
            if (!this.video) return;
            this.video.addEventListener('play', () => { this.isPlaying = true; });
            this.video.addEventListener('pause', () => {
                if (!this.video.ended && this.isPlaying) {
                    setTimeout(() => {
                        if (this.video && this.video.paused && !this.video.ended) this.video.play().catch(() => {});
                    }, 300);
                }
            });
            this.video.addEventListener('ended', () => this.onVideoEnded());
            this.video.addEventListener('error', () => {
                log('视频播放错误，尝试重载', 'error');
                setTimeout(() => { if (this.video) { this.video.load(); this.video.play().catch(() => {}); } }, 3000);
            });
        }

        startAutoPlay() {
            if (!this.video) { this.tryInitPlayer(); return; }
            this.applyPlaybackRate();
            if (CONFIG.autoMute) this.video.muted = true;
            
            this.video.play().then(() => {
                this.isPlaying = true;
                notify('刷课已开始', `第 ${this.currentVideoIndex + 1}/${this.getAllVideoItems().length} 个视频`);
                this.startStatusCheck();
            }).catch(err => {
                log('自动播放失败，强制静音重试: ' + err.message, 'error');
                this.video.muted = true;
                this.video.play().catch(() => log('请手动点击播放一次以激活', 'error'));
            });
        }

        stopAutoPlay() {
            if (this.checkTimer) { clearInterval(this.checkTimer); this.checkTimer = null; }
            if (this.video) this.video.pause();
            this.isPlaying = false;
            notify('刷课已停止', '脚本已暂停运行');
        }

        togglePlay() { if (this.video) this.video.paused ? this.video.play().catch(() => {}) : this.video.pause(); }
        
        toggleMute() {
            if (!this.video) return;
            this.video.muted = !this.video.muted;
            CONFIG.autoMute = this.video.muted;
            GM_setValue('autoMute', CONFIG.autoMute);
        }

        setSpeed(speed) {
            CONFIG.playbackRate = speed;
            GM_setValue('playbackRate', speed);
            this.applyPlaybackRate();
            notify('速度已设置', `播放速度: ${speed}x`);
        }

        startStatusCheck() {
            if (this.checkTimer) clearInterval(this.checkTimer);
            this.checkTimer = setInterval(() => this.checkVideoStatus(), CONFIG.checkInterval);
        }

        checkVideoStatus() {
            if (!this.video) { this.tryInitPlayer(); return; }
            if (this.video.paused && !this.video.ended && this.isPlaying) this.video.play().catch(() => {});
        }

        onVideoEnded() {
            if (this.isCompleted) return;
            this.isCompleted = true;
            log('视频播放完成！', 'success');
            notify('课程已完成', `第 ${this.currentVideoIndex + 1}/${this.getAllVideoItems().length} 个视频播放完成`);
            if (this.checkTimer) { clearInterval(this.checkTimer); this.checkTimer = null; }
            setTimeout(() => this.playNextVideo(), CONFIG.nextVideoDelay);
        }

        playNextVideo() {
            this.updateCurrentVideoIndex();
            const videoItems = this.getAllVideoItems();
            if (videoItems.length === 0) { notify('切换失败', '未找到课程目录'); return; }
            
            const nextIndex = this.currentVideoIndex + 1;
            if (nextIndex >= videoItems.length) { notify('🎉 刷课完成！', '所有视频已播放完毕'); return; }

            const nextVideo = videoItems[nextIndex];
            const videoName = nextVideo.textContent?.trim().split('时长')[0] || `第${nextIndex + 1}个视频`;
            
            let currentHash = location.hash;
            nextVideo.click();
            
            setTimeout(() => {
                if (location.hash === currentHash) {
                    const href = nextVideo.getAttribute('href');
                    if (href) {
                        log('点击切换失效，执行强制Hash跳转', 'warn');
                        location.hash = href;
                    }
                }
            }, 500);

            notify('切换视频', `正在播放: ${videoName}`);
            this.isCompleted = false;
            this.isPlaying = false;
            this.video = null;
            setTimeout(() => { this.updateCurrentVideoIndex(); this.tryInitPlayer(); }, 3000);
        }

        playPrevVideo() {
            this.updateCurrentVideoIndex();
            const videoItems = this.getAllVideoItems();
            if (videoItems.length === 0) return;
            const prevIndex = this.currentVideoIndex - 1;
            if (prevIndex < 0) { notify('提示', '已经是第一个视频了'); return; }
            
            const prevVideo = videoItems[prevIndex];
            let currentHash = location.hash;
            prevVideo.click();
            setTimeout(() => {
                if (location.hash === currentHash) {
                    const href = prevVideo.getAttribute('href');
                    if (href) location.hash = href;
                }
            }, 500);

            this.isCompleted = false; this.isPlaying = false; this.video = null;
            setTimeout(() => { this.updateCurrentVideoIndex(); this.tryInitPlayer(); }, 3000);
        }

        showProgress() {
            const videoItems = this.getAllVideoItems();
            this.updateCurrentVideoIndex();
            const current = this.currentVideoIndex + 1;
            const total = videoItems.length;
            const percent = total > 0 ? ((current / total) * 100).toFixed(1) : 0;
            let timeInfo = this.video ? `\n当前: ${this.formatTime(this.video.currentTime)} / ${this.formatTime(this.video.duration)}` : '';
            notify('当前进度', `第 ${current}/${total} 个视频 (${percent}%)${timeInfo}`);
        }

        formatTime(seconds) {
            if (!seconds || isNaN(seconds)) return '00:00';
            const h = Math.floor(seconds / 3600);
            const m = Math.floor((seconds % 3600) / 60);
            const s = Math.floor(seconds % 60);
            return h > 0 ? `${h.toString().padStart(2, '0')}:${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}` : `${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`;
        }
    }

    // ==================== 启动 ====================
    if (document.readyState === 'complete') {
        new AutoPlayManager();
    } else {
        window.addEventListener('load', () => new AutoPlayManager());
    }
})();