// ==UserScript==
// @name         生态环境云课堂自动学习助手
// @namespace    http://onlinelearning.21tb.com/
// @version      3.9
// @description  全国生态环境执法培训云课堂全自动学习：自动识别未完成必修、静音播放、自动切换章节、自动关弹窗、课后题全答完提交、学完自动切下一门
// @author       study_bot
// @match        *://onlinelearning.21tb.com/*
// @grant        none
// @run-at       document-idle
// @tag          教育,学习,自动化,网课,云课堂
// ==/UserScript==
(function() {
    'use strict';
    const CONFIG = { checkInterval: 4000, actionCooldown: 15000 };
    const state = {
        lastActionTime: 0,
        visitedCourses: new Set(JSON.parse(localStorage.getItem('visitedCourses') || '[]'))
    };
    function log(msg) { console.log(`[自动学习v3.9] ${new Date().toLocaleTimeString()} | ${msg}`); }
    function getAllDocs() {
        const docs = [document];
        document.querySelectorAll('iframe').forEach(fr => {
            try { if (fr.contentDocument) docs.push(fr.contentDocument); } catch(e) {}
        });
        return docs;
    }
    function closePopups() {
        getAllDocs().forEach(doc => {
            try {
                doc.querySelectorAll('button[aria-label="Close"], .el-dialog__close, .el-icon-close').forEach(btn => { if (btn.offsetParent) btn.click(); });
                [...doc.querySelectorAll('button')].forEach(btn => {
                    const t = (btn.innerText || '').trim();
                    if (btn.offsetParent && (t === '关闭窗口' || t === '知道了' || t === '关 闭')) { btn.click(); log('关闭弹窗'); }
                });
                doc.querySelectorAll('.el-dialog__wrapper, .el-overlay').forEach(m => { if (getComputedStyle(m).display !== 'none') m.click(); });
            } catch(e) {}
        });
    }
    function playVideo() {
        getAllDocs().forEach(doc => {
            doc.querySelectorAll('video').forEach(v => {
                v.muted = true; v.volume = 0; v.playbackRate = 1.0;
                if (v.paused) v.play().catch(()=>{});
            });
        });
    }
    function pickNextCourse() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        getAllDocs().forEach(doc => {
            try {
                if (!doc.location.href.includes('course_manage_user_pc')) return;
                const cards = [...doc.querySelectorAll('div, button')].filter(el => {
                    if (!el.innerText || !el.offsetParent) return false;
                    const t = el.innerText;
                    return t.includes('必修') && t.includes('学习进度') && t.includes('0.0%') && !t.includes('已完成') && t.length < 300;
                });
                for (let c of cards) {
                    const key = c.innerText.slice(0,40);
                    if (!state.visitedCourses.has(key)) {
                        log('自动选未完成必修课: ' + c.innerText.split('\n')[0]);
                        c.click();
                        state.visitedCourses.add(key);
                        localStorage.setItem('visitedCourses', JSON.stringify([...state.visitedCourses]));
                        state.lastActionTime = now;
                        return;
                    }
                }
            } catch(e) {}
        });
    }
    function nextSection() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        getAllDocs().forEach(doc => {
            try {
                if (!doc.location.href.includes('courseLearning/play')) return;
                const nextBtn = [...doc.querySelectorAll('button')].find(el => (el.innerText || '').trim() === '下一节' && el.offsetParent && !el.disabled);
                if (nextBtn) { nextBtn.click(); state.lastActionTime = now; log('点击下一节'); return; }
                const unDoneBtns = [...doc.querySelectorAll('button')].filter(el => (el.innerText || '').trim() === '未完成' && el.offsetParent);
                if (unDoneBtns.length > 0) {
                    log(`发现${unDoneBtns.length}个未完成章节，点击第一个`);
                    unDoneBtns[0].click();
                    state.lastActionTime = now;
                    return;
                }
                const closeBtn = [...doc.querySelectorAll('button')].find(el => (el.innerText || '').trim() === '关 闭' && el.offsetParent);
                if (closeBtn && !doc.body.innerText.includes('未完成')) {
                    log('本课程全部学完，关闭返回课程列表');
                    closeBtn.click();
                    state.lastActionTime = now;
                }
            } catch(e) {}
        });
    }
    async function answerQuiz() {
        getAllDocs().forEach(async doc => {
            try {
                const qs = doc.querySelectorAll('[class*=question-item], [class*=quiz-item]');
                if (!qs.length) return;
                log(`检测到${qs.length}道题，开始作答`);
                for (let q of qs) {
                    const opts = q.querySelectorAll('label, .el-radio, .el-checkbox-item');
                    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,300)); }
                }
                await new Promise(r=>setTimeout(r,1500));
                const allDone = [...qs].every(q => q.querySelectorAll('.is-checked').length > 0);
                if (allDone) {
                    const submit = [...doc.querySelectorAll('button')].find(b => b.innerText?.includes('提交') && b.offsetParent);
                    if (submit) { submit.click(); log('全部题目答完，提交试卷'); }
                }
            } catch(e) {}
        });
    }
    async function loop() {
        closePopups(); playVideo(); pickNextCourse(); nextSection();
        const hasQuiz = getAllDocs().some(d => d.body.innerText.includes('单选题') || d.querySelectorAll('[class*=question-item]').length > 0);
        if (hasQuiz) await answerQuiz();
        setTimeout(loop, CONFIG.checkInterval);
    }
    log('v3.9启动：永久自动学习，刷新不失效');
    setTimeout(loop, 3000);
})();