// ==UserScript==
// @name         生态环境云课堂自动学习助手
// @namespace    http://onlinelearning.21tb.com/
// @version      3.1
// @description  全国生态环境执法培训云课堂全自动学习：学完一门自动切下一门必修，自动关弹窗、自动播放切章节、自动答完题，静音后台运行
// @author       study_bot
// @match        *://onlinelearning.21tb.com/*
// @grant        none
// @run-at       document-idle
// @noframes
// @tag          教育,学习,自动化,网课,云课堂
// @license MIT
// ==/UserScript==

(function() {
    'use strict';
    const CONFIG = {
        checkInterval: 5000,
        actionCooldown: 12000,
    };
    const state = {
        lastActionTime: 0,
        visitedCourses: new Set(JSON.parse(localStorage.getItem('visitedCourses') || '[]')),
    };

    function log(msg) { console.log(`[自动学习v3.1] ${new Date().toLocaleTimeString()} | ${msg}`); }

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

    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) {}
    }

    // 首页自动进我的课程
    function goCourseList() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (location.pathname.includes('/student/index')) {
                const btn = [...document.querySelectorAll('a, div, span')].find(el => el.innerText?.trim() === '我的课程' && el.offsetParent);
                if (btn) { log('进入我的课程'); btn.click(); state.lastActionTime = now; }
            }
        } catch(e) {}
    }

    // 课程列表自动选未学必修
    function pickNextCourse() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (!location.href.includes('course_manage_user_pc')) return;
            const cards = [...document.querySelectorAll('[class*=card], [class*=item]')];
            for (let c of cards) {
                const t = c.innerText || '';
                if (t.includes('必修') && !t.includes('已完成') && !t.includes('100%') && !state.visitedCourses.has(t.slice(0,20))) {
                    log('点击未学必修: ' + t.split('\n')[0]);
                    c.click(); state.visitedCourses.add(t.slice(0,20));
                    localStorage.setItem('visitedCourses', JSON.stringify([...state.visitedCourses]));
                    state.lastActionTime = now; return;
                }
            }
        } catch(e) {}
    }

    // 播放页切下一节
    function nextSection() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (!location.href.includes('courseLearning/play')) return;
            const nextBtn = [...document.querySelectorAll('button, div')].find(el => el.innerText?.trim() === '下一节' && el.offsetParent);
            if (nextBtn) { log('点下一节'); nextBtn.click(); state.lastActionTime = now; return; }
            // 找未完成章节点
            const unDone = [...document.querySelectorAll('span, div')].filter(el => el.innerText?.trim() === '未完成' && el.offsetParent);
            for (let el of unDone) {
                let p = el.parentElement;
                for (let i=0;i<6;i++) {
                    if (!p) break;
                    if (p.tagName === 'LI' || p.tagName === 'A') { p.click(); state.lastActionTime = now; log('点未完成章节'); return; }
                    p = p.parentElement;
                }
            }
            // 当前课程所有章节学完，自动回课程列表选下一门
            const noNext = [...document.querySelectorAll('button')].find(b => b.innerText?.includes('下一节') && b.disabled);
            if (noNext || document.body.innerText.includes('本课程学习完成')) {
                log('当前课程已学完，返回课程列表');
                history.back(); state.lastActionTime = now;
            }
        } catch(e) {}
    }

    // 自动答题
    async function answerQuiz() {
        try {
            const qs = document.querySelectorAll('[class*=question]');
            if (!qs.length) return;
            log(`检测到${qs.length}题，开始作答`);
            for (let q of qs) {
                const opts = q.querySelectorAll('label, .option, .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 = [...qs].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(); log('所有题答完提交'); }
            }
        } catch(e) {}
    }

    async function loop() {
        closePopups(); playVideo(); goCourseList(); pickNextCourse(); nextSection();
        if (document.body.innerText.includes('单选题')) await answerQuiz();
        setTimeout(loop, CONFIG.checkInterval);
    }
    log('v3.1启动：学完一门自动切下一门必修');
    setTimeout(loop, 3000);
})();