// ==UserScript==
// @name         生态环境云课堂自动学习助手v2.9
// @namespace    http://onlinelearning.21tb.com/
// @version      2.9
// @description  自动关弹窗、自动进我的课程、自动选未学必修、自动播放切章节、自动答题，静音后台运行
// @author       study_bot
// @match        *://onlinelearning.21tb.com/*
// @grant        none
// @run-at       document-idle
// @tag          教育,学习,自动化
// @license MIT
// ==/UserScript==

(function() {
    'use strict';
    const CHECK_INTERVAL = 4000;
    const ACTION_COOLDOWN = 10000;
    let lastActionTime = 0;

    function log(msg) {
        try { console.log(`[自动学习v2.9] ${new Date().toLocaleTimeString()} ${msg}`); } catch(e) {}
    }

    // 1. 关所有弹窗
    function closePopups() {
        try {
            document.querySelectorAll('.el-dialog__close, .el-message-box__close, .close-btn, .el-icon-close').forEach(b => { try{b.click()}catch(e){} });
        } catch(e) {}
    }

    // 2. 视频静音播放
    function playVideo() {
        try {
            document.querySelectorAll('video').forEach(v => {
                v.muted = true; v.volume = 0; v.playbackRate = 1;
                if (v.paused) v.play().catch(()=>{});
            });
        } catch(e) {}
    }

    // 3. 首页自动点"我的课程"
    function goToCourseList() {
        const now = Date.now();
        if (now - lastActionTime < ACTION_COOLDOWN) return;
        try {
            if (location.pathname.includes('/student/index')) {
                const myCourse = [...document.querySelectorAll('a, div, span')].find(el => 
                    el.innerText && el.innerText.trim() === '我的课程' && el.offsetParent !== null
                );
                if (myCourse) {
                    log('在首页，点击进入我的课程');
                    myCourse.click();
                    lastActionTime = now;
                }
            }
        } catch(e) {}
    }

    // 4. 课程列表自动选未学习必修
    function pickNextCourse() {
        const now = Date.now();
        if (now - lastActionTime < ACTION_COOLDOWN) return;
        try {
            const cards = [...document.querySelectorAll('[class*=course-item], [class*=card], .list-item')];
            for (let card of cards) {
                const txt = card.innerText;
                if (txt.includes('必修') && !txt.includes('已完成') && !txt.includes('100%')) {
                    log('点击未学习必修课程: ' + txt.slice(0,40));
                    card.click();
                    lastActionTime = now;
                    return;
                }
            }
        } catch(e) {}
    }

    // 5. 播放页自动点下一节
    function clickNextSection() {
        const now = Date.now();
        if (now - lastActionTime < ACTION_COOLDOWN) return;
        try {
            const nextBtn = [...document.querySelectorAll('button, div')].find(el => 
                el.innerText && el.innerText.trim() === '下一节' && el.offsetParent !== null
            );
            if (nextBtn) { log('点击下一节'); nextBtn.click(); lastActionTime = now; return; }
            const unDone = [...document.querySelectorAll('span, div')].filter(el => 
                el.innerText && el.innerText.trim() === '未完成' && el.offsetParent !== null
            );
            for (let el of unDone) {
                let parent = el.parentElement;
                for (let i=0;i<6;i++) {
                    if (!parent) break;
                    if (parent.tagName === 'LI' || parent.tagName === 'A' || parent.onclick) {
                        log('选择未完成章节'); parent.click(); lastActionTime = now; return;
                    }
                    parent = parent.parentElement;
                }
            }
        } catch(e) {}
    }

    // 6. 自动答题
    async function autoAnswer() {
        try {
            const questions = document.querySelectorAll('[class*=question]');
            if (!questions.length) return;
            log(`检测到${questions.length}道题，开始作答`);
            for (let q of questions) {
                const opts = q.querySelectorAll('label, .option-item, .el-radio, .el-checkbox');
                const unsel = [...opts].filter(o => !o.classList.contains('is-checked'));
                if (unsel.length) { unsel[Math.floor(Math.random()*unsel.length)].click(); await new Promise(r=>setTimeout(r,200)); }
            }
            await new Promise(r=>setTimeout(r,1000));
            const allDone = [...questions].every(q => q.querySelectorAll('.is-checked').length > 0);
            if (allDone) {
                const submit = [...document.querySelectorAll('button')].find(b => b.innerText.includes('提交'));
                if (submit) submit.click();
            }
        } catch(e) {}
    }

    // 7. 主循环
    async function loop() {
        closePopups();
        playVideo();
        goToCourseList();
        if (location.href.includes('course_manage_user_pc')) pickNextCourse();
        else clickNextSection();
        if (document.body.innerText.includes('单选题')) await autoAnswer();
        setTimeout(loop, CHECK_INTERVAL);
    }

    log('自动学习v2.9启动：首页自动进课程、自动选未学课程');
    setTimeout(loop, 2000);
})();