// ==UserScript==
// @name         盐城师范学院专业技术人员继续教育平台(盐城人才在线)视频解锁
// @namespace    https://yctc.ycrczx.com/
// @version      2.0
// @description  解除视频快进限制、自动播放、秒杀最后3秒
// @author       Marvis
// @match        https://yctc.ycrczx.com/video/*
// @grant        none
// @run-at       document-start
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    // ========== 策略1：拦截 seeking 事件，阻止网站将播放位置弹回 ==========
    function unlockSeek() {
        const videos = document.querySelectorAll('video');
        videos.forEach(video => {
            // 劫持 addEventListener，阻止 seeking 相关的事件监听
            const origAddEventListener = EventTarget.prototype.addEventListener;
            const blockedEvents = ['seeking', 'seeked', 'timeupdate'];
            EventTarget.prototype.addEventListener = function(type, listener, options) {
                if (this instanceof HTMLVideoElement && blockedEvents.includes(type)) {
                    console.log('[解锁脚本] 已拦截视频事件监听:', type);
                    return;
                }
                return origAddEventListener.call(this, type, listener, options);
            };

            // 直接给已有 video 解除限制
            video.addEventListener = function() {};
            video.removeAttribute('disableRemotePlayback');
            video.controls = true;
        });
    }

    // ========== 策略2：清除网站的 seeking 限制逻辑 ==========
    function overrideSeekRestriction() {
        // 代理 video 的 currentTime setter，阻止被重置
        const videoProto = HTMLMediaElement.prototype;
        const origCurrentTimeDescriptor = Object.getOwnPropertyDescriptor(videoProto, 'currentTime');

        Object.defineProperty(videoProto, 'currentTime', {
            get: function() {
                return origCurrentTimeDescriptor.get.call(this);
            },
            set: function(value) {
                // 允许任意设置播放位置
                return origCurrentTimeDescriptor.set.call(this, value);
            },
            configurable: true,
            enumerable: true
        });
    }

    // ========== 策略3：定时解除视频限制 ==========
    function keepUnlocking() {
        setInterval(() => {
            document.querySelectorAll('video').forEach(video => {
                // 移除可能限制播放的属性
                video.removeAttribute('disableRemotePlayback');
                video.controls = true;

                // 移除内联事件
                video.onseeking = null;
                video.onseeked = null;
                video.ontimeupdate = null;

                // 确保播放速率不受限
                if (video.playbackRate !== 1) {
                    // 允许用户自行调整倍速
                }
            });
        }, 1000);
    }

    // ========== 策略4：捕获并阻止限制脚本 ==========
    function blockRestrictionScripts() {
        // 使用 MutationObserver 监听新增的 video 元素
        const observer = new MutationObserver(mutations => {
            mutations.forEach(mutation => {
                mutation.addedNodes.forEach(node => {
                    if (node.nodeName === 'VIDEO') {
                        node.onseeking = null;
                        node.onseeked = null;
                        node.ontimeupdate = null;
                        node.controls = true;
                    }
                    if (node.querySelectorAll) {
                        node.querySelectorAll('video').forEach(v => {
                            v.onseeking = null;
                            v.onseeked = null;
                            v.ontimeupdate = null;
                            v.controls = true;
                        });
                    }
                });
            });
        });

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

    // ========== 策略5：覆盖 HTMLMediaElement 的 onseeking ==========
    function overrideOnSeeking() {
        const videoProto = HTMLMediaElement.prototype;
        let origOnSeekingDescriptor;
        try {
            origOnSeekingDescriptor = Object.getOwnPropertyDescriptor(videoProto, 'onseeking');
        } catch(e) {}

        if (origOnSeekingDescriptor && origOnSeekingDescriptor.set) {
            const origSetter = origOnSeekingDescriptor.set;
            Object.defineProperty(videoProto, 'onseeking', {
                get: function() { return null; },
                set: function(fn) {
                    console.log('[解锁脚本] 已拦截 onseeking 赋值');
                    // 不执行任何操作，阻止设置限制
                },
                configurable: true
            });
        }
    }

    // ========== 新增功能：自动播放最后3秒并显示秒杀提示 ==========
    function autoPlayLast3Seconds() {
        const videos = document.querySelectorAll('video');
        videos.forEach(video => {
            // 等待视频元数据加载
            if (video.readyState < 1) {
                video.addEventListener('loadedmetadata', () => {
                    playLast3Seconds(video);
                });
            } else {
                playLast3Seconds(video);
            }
        });
    }

    function playLast3Seconds(video) {
        const duration = video.duration;
        if (duration > 3) {
            video.currentTime = duration - 3;
            video.play().catch(e => console.log('[解锁脚本] 自动播放失败:', e));
            console.log(`[解锁脚本] 自动跳转至最后3秒 (${duration-3}s)`);
        }
    }

    // ========== 新增功能：在页面左下角显示秒杀提示 ==========
    function showKillMessage() {
        const msgDiv = document.createElement('div');
        msgDiv.id = 'video-kill-message';
        msgDiv.innerHTML = '秒杀中......';
        Object.assign(msgDiv.style, {
            position: 'fixed',
            left: '10px',
            bottom: '10px',
            zIndex: '999999',
            background: '#ff4444',
            color: 'white',
            padding: '8px 16px',
            borderRadius: '4px',
            fontSize: '14px',
            fontWeight: 'bold',
            boxShadow: '0 2px 8px rgba(0,0,0,0.3)',
            opacity: '0.9',
            fontFamily: 'Arial, sans-serif'
        });
        document.body.appendChild(msgDiv);
    }

    // ========== 执行所有策略 ==========
    function init() {
        overrideSeekRestriction();
        overrideOnSeeking();
        showKillMessage(); // 显示秒杀提示

        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', () => {
                unlockSeek();
                blockRestrictionScripts();
                keepUnlocking();
                autoPlayLast3Seconds();
                console.log('[解锁脚本] 视频快进与进度条限制已解除，自动播放最后3秒');
            });
        } else {
            unlockSeek();
            blockRestrictionScripts();
            keepUnlocking();
            autoPlayLast3Seconds();
            console.log('[解锁脚本] 视频快进与进度条限制已解除，自动播放最后3秒');
        }

        // 监听新视频元素
        const observer = new MutationObserver(mutations => {
            mutations.forEach(mutation => {
                mutation.addedNodes.forEach(node => {
                    if (node.nodeName === 'VIDEO' || (node.querySelectorAll && node.querySelectorAll('video').length > 0)) {
                        autoPlayLast3Seconds();
                    }
                });
            });
        });
        observer.observe(document.documentElement, { childList: true, subtree: true });
    }

    init();
})();