// ==UserScript==
// @name         同创全自动学习助手（后台计时修复版）
// @namespace    http://tampermonkey.net/
// @version      5.0
// @description  强制后台播放 + 后台时长欺骗 + 自动下一节（修复计时不增长）
// @match        *://*.strong365.com/*
// @match        *://yun.strong365.com/*
// @grant        none
// @license MIT
// ==/UserScript==

(function() {
    'use strict';

    const CHECK_INTERVAL = 2000;        // 检测弹窗间隔(ms)
    const NEXT_KEYWORDS = ['学习下一节', '下一节', '继续学习', 'Next', '继续'];

    let video = null;
    let retryCount = 0;
    const MAX_RETRY = 30;

    // ---------- 核心伪装：让页面以为自己永远在前台 ----------
    function fakeVisibility() {
        // 覆盖 document.hidden
        const hiddenDescriptor = Object.getOwnPropertyDescriptor(Document.prototype, 'hidden');
        if (hiddenDescriptor) {
            Object.defineProperty(document, 'hidden', {
                get: () => false,
                configurable: true
            });
        } else {
            // 直接覆盖
            Object.defineProperty(document, 'hidden', { value: false, writable: false });
        }

        // 覆盖 document.visibilityState
        const visDescriptor = Object.getOwnPropertyDescriptor(Document.prototype, 'visibilityState');
        if (visDescriptor) {
            Object.defineProperty(document, 'visibilityState', {
                get: () => 'visible',
                configurable: true
            });
        } else {
            Object.defineProperty(document, 'visibilityState', { value: 'visible', writable: false });
        }

        // 重写 hasFocus()
        document.hasFocus = () => true;

        // 拦截 visibilitychange 事件，让它根本不触发回调
        document.addEventListener('visibilitychange', function(e) {
            e.stopImmediatePropagation();
        }, true);

        // 补充：某些页面可能通过 onfocus/onblur 检测，也阻止冒泡
        window.addEventListener('blur', e => e.stopImmediatePropagation(), true);
        window.addEventListener('focus', e => e.stopImmediatePropagation(), true);
    }

    // 定期重新伪装，防止页面动态复原
    function keepFaking() {
        fakeVisibility();
    }

    // ---------- 安全查找视频 ----------
    function findVideo() {
        try {
            const iframe = document.querySelector('.iframe-box iframe');
            if (iframe) {
                try {
                    const v = iframe.contentDocument.querySelector('video');
                    if (v) return v;
                } catch(e) {}
            }
            return document.querySelector('video');
        } catch(e) {
            return null;
        }
    }

    function ensureVideo() {
        if (!video || !document.contains(video)) {
            video = findVideo();
            if (video) console.log('🔄 视频重新捕获');
        }
        return video;
    }

    // ---------- 强制播放 ----------
    function forcePlay() {
        try {
            const v = ensureVideo();
            if (v && typeof v.play === 'function' && v.paused) {
                v.play().catch(err => console.warn('播放恢复失败:', err));
            }
        } catch(e) {}
    }

    // ---------- 自动点击“学习下一节” ----------
    function clickNextButton() {
        try {
            let doc = document;
            const iframe = document.querySelector('.iframe-box iframe');
            if (iframe) {
                try {
                    doc = iframe.contentDocument || iframe.contentWindow.document;
                } catch(e) {}
            }

            const allElements = doc.querySelectorAll(
                'button, a, input[type="button"], input[type="submit"], ' +
                '[role="button"], .btn, .button, .el-button, .el-btn, ' +
                'div[class*="btn"], span[class*="btn"], ' +
                '.next, .next-btn, .continue-btn, .submit-btn, .confirm-btn, ' +
                '.dialog-footer button, .modal-footer button, .el-dialog__footer button, ' +
                '.layui-layer-btn button, .layui-layer-btn a'
            );

            for (let el of allElements) {
                const text = (el.textContent || el.innerText || '').trim();
                if (!text) continue;

                const matched = NEXT_KEYWORDS.some(kw => text.toLowerCase().includes(kw.toLowerCase()));
                if (!matched) continue;

                // 由于我们伪装了可见性，按钮不应因 tab 隐藏而不可见，但仍检查尺寸
                const rect = el.getBoundingClientRect();
                if (rect.width === 0 && rect.height === 0) continue; // 真正不可见

                el.click();
                console.log('🎯 已自动点击“' + text + '”');
                setTimeout(() => { video = findVideo(); }, 500);
                return true;
            }
            return false;
        } catch(e) {
            return false;
        }
    }

    // ---------- 初始化 ----------
    function init() {
        // 立即执行一次伪装
        fakeVisibility();
        // 定期更新伪装，防止页面重置
        setInterval(keepFaking, 1000);

        const v = findVideo();
        if (!v) {
            if (retryCount++ < MAX_RETRY) {
                setTimeout(init, 1000);
            } else {
                console.warn('⚠️ 未找到视频元素，可能页面未完全加载');
            }
            return;
        }
        video = v;
        console.log('✅ 已捕获视频元素');

        // ---- 后台播放 ----
        setInterval(forcePlay, 500);
        window.addEventListener('blur', () => setTimeout(forcePlay, 100));

        // 拦截播放器 pause
        const playerNames = ['player', 'aliplayer', 'Aliplayer', 'videoPlayer'];
        playerNames.forEach(name => {
            if (window[name] && typeof window[name].play === 'function') {
                const origPause = window[name].pause;
                if (origPause) {
                    window[name].pause = function() {
                        if (document.hidden) { // 已被伪装，其实不会 true
                            console.log('🛡️ 拦截了播放器暂停请求');
                            return;
                        }
                        return origPause.apply(this, arguments);
                    };
                    console.log(`✅ 拦截了播放器对象 ${name}.pause`);
                }
            }
        });

        // 视频自身的 pause
        video.addEventListener('pause', function() {
            this.play().catch(() => {});
        });

        // iframe 重新加载
        const iframe = document.querySelector('.iframe-box iframe');
        if (iframe) {
            iframe.addEventListener('load', function() {
                console.log('🔄 iframe 重新加载');
                setTimeout(() => {
                    video = findVideo();
                    if (video) console.log('✅ 视频重新捕获成功');
                }, 1000);
            });
        }

        // ---- 自动点击下一节 ----
        setInterval(() => {
            clickNextButton();
        }, CHECK_INTERVAL);
        setTimeout(clickNextButton, 2000);

        console.log(`🎯 所有功能已启动（后台伪装 + 强制播放 + 每 ${CHECK_INTERVAL/1000} 秒检测下一节）`);
    }

    // 启动
    if (document.readyState === 'complete') {
        setTimeout(init, 1500);
    } else {
        window.addEventListener('load', () => setTimeout(init, 1500));
    }
})();