// ==UserScript==
// @name         生态环境云课堂自动学习助手
// @namespace    http://onlinelearning.21tb.com/
// @version      3.3
// @description  全国生态环境执法培训云课堂全自动学习：精准关弹窗、自动循环学完所有必修，静音后台运行，修复重复选课/弹窗识别bug
// @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: 4000,
        actionCooldown: 12000,
        storageKey: 'studyBotVisitedCourses'
    };
    const state = {
        lastActionTime: 0,
        visitedCourses: new Set(JSON.parse(localStorage.getItem(CONFIG.storageKey) || '[]')),
        courseCompleted: false
    };

    function log(msg) { try { console.log(`[自动学习v3.3] ${new Date().toLocaleTimeString()} | ${msg}`); } catch(e) {} }
    function isVisible(el) { return el && el.offsetParent !== null || (getComputedStyle(el).position === 'fixed' && getComputedStyle(el).display !== 'none'); }
    function saveVisited() { localStorage.setItem(CONFIG.storageKey, JSON.stringify([...state.visitedCourses])); }

    // 1. 精准关弹窗
    function closePopups() {
        try {
            document.querySelectorAll('button[aria-label="Close"], .el-dialog__close, .modal-close, .el-icon-close, .close-icon').forEach(btn => {
                try { if (isVisible(btn)) btn.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, .nav-link')].find(el => 
                    el.innerText?.trim() === '我的课程' && isVisible(el)
                );
                if (btn) { log('首页自动进入我的课程'); btn.click(); state.lastActionTime = now; }
            }
        } catch(e) {}
    }

    // 4. 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;
            // 精准选课程卡片
            const cards = [...document.querySelectorAll('.course-card, .item-card, .course-item, [class*="course-list"] [class*="card"]')];
            for (let c of cards) {
                const t = c.innerText || '';
                if (t.includes('必修') && !t.includes('已完成') && !t.includes('100%')) {
                    const courseName = t.split('\n')[0].trim();
                    if (state.visitedCourses.has(courseName)) continue;
                    log(`进入未学必修课程: ${courseName}`);
                    c.click();
                    state.visitedCourses.add(courseName);
                    saveVisited();
                    state.lastActionTime = now;
                    return;
                }
            }
        } catch(e) {}
    }

    // 5. 播放页切章节
    function nextSection() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (!location.href.includes('courseLearning/play')) return;
            // 找下一节按钮
            const nextBtn = [...document.querySelectorAll('button')].find(el => 
                el.innerText?.trim() === '下一节' && isVisible(el) && !el.disabled
            );
            if (nextBtn) { log('点击下一节'); nextBtn.click(); state.lastActionTime = now; return; }
            // 找右侧未完成章节
            const unDone = [...document.querySelectorAll('span, div')].filter(el => 
                el.innerText?.trim() === '未完成' && isVisible(el)
            );
            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.onclick) {
                        log('点击未完成章节');
                        p.click(); state.lastActionTime = now; return;
                    }
                    p = p.parentElement;
                }
            }
            // 确认课程全部学完才返回列表
            if (document.body.innerText.includes('恭喜你完成本课程')) {
                log('当前课程全部学完，返回列表选下一门');
                state.courseCompleted = true;
                setTimeout(() => history.back(), 2000);
                state.lastActionTime = now;
            }
        } catch(e) {}
    }

    // 6. 自动答题（提高正确率）
    async function answerQuiz() {
        try {
            const qs = document.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 qText = q.innerText || '';
                const opts = q.querySelectorAll('label, .el-radio, .el-checkbox-item, .option');
                const unsel = [...opts].filter(o => !o.classList.contains('is-checked'));
                if (!unsel.length) continue;
                // 判断题优先选"正确"
                if (qText.includes('正确') && qText.includes('错误')) {
                    const right = unsel.find(o => o.innerText.includes('正确'));
                    if (right) { right.click(); await new Promise(r=>setTimeout(r,200)); continue; }
                }
                // 其他题随机选
                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') && isVisible(b));
                if (submit) { log('所有题目作答完成，提交答卷'); submit.click(); }
            }
        } catch(e) {}
    }

    // 主循环
    async function loop() {
        closePopups();
        playVideo();
        goCourseList();
        pickNextCourse();
        nextSection();
        if (document.body.innerText.includes('单选题') || document.body.innerText.includes('判断题')) {
            await answerQuiz();
        }
        setTimeout(loop, CONFIG.checkInterval);
    }

    log('v3.3修复版启动：精准弹窗识别、高正确率答题、不重复选课');
    setTimeout(loop, 2000);
})();