// ==UserScript==
// @name         生态环境云课堂自动学习助手
// @namespace    http://onlinelearning.21tb.com/
// @version      3.0
// @description  全国生态环境执法培训云课堂全自动学习：自动关弹窗、自动进课程、自动选未学必修、自动播放切章节、自动答完所有题提交，静音后台运行不打扰工作
// @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';
    // 配置
    const CONFIG = {
        checkInterval: 5000,
        actionCooldown: 12000,
        maxRetries: 5,
    };
    const state = {
        lastActionTime: 0,
        retryCount: 0,
        visitedCourses: new Set(JSON.parse(localStorage.getItem('visitedCourses') || '[]')),
    };

    function log(msg) {
        try { console.log(`[云课堂自动学习v3.0] ${new Date().toLocaleTimeString()} | ${msg}`); } catch(e) {}
    }

    // 1. 关闭所有弹窗
    function closeAllPopups() {
        try {
            // 所有关闭按钮
            document.querySelectorAll('.el-dialog__close, .el-message-box__close, .close-btn, .el-icon-close, .el-dialog__headerbtn').forEach(btn => {
                try { btn.click(); } catch(e){}
            });
            // 关闭遮罩层
            document.querySelectorAll('.el-dialog__wrapper').forEach(modal => {
                try { if (modal.style.display !== 'none') modal.click(); } catch(e){}
            });
        } catch(e) {}
    }

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

    // 3. 首页自动进入我的课程
    function goToMyCourses() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (location.pathname.includes('/student/index')) {
                const navBtn = [...document.querySelectorAll('a, div, span, .nav-item')].find(el => 
                    el.innerText && el.innerText.trim() === '我的课程' && el.offsetParent !== null
                );
                if (navBtn) {
                    log('首页：点击进入我的课程');
                    navBtn.click();
                    state.lastActionTime = now;
                }
            }
        } catch(e) {}
    }

    // 4. 课程列表页自动选择未学习必修课程
    function pickNextUnfinishedCourse() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (!location.href.includes('course_manage_user_pc')) return;
            // 获取所有课程卡片
            const cards = [...document.querySelectorAll('[class*=course-card], [class*=item-card], .list-item, .course-item')];
            for (let card of cards) {
                const text = card.innerText || '';
                // 跳过已完成的、已经点过的
                if (text.includes('已完成') || text.includes('100%') || state.visitedCourses.has(text.slice(0,20))) continue;
                // 只选必修课
                if (text.includes('必修') && !text.includes('完成')) {
                    log('找到未学习必修课程: ' + text.split('\n')[0]);
                    card.click();
                    state.visitedCourses.add(text.slice(0,20));
                    localStorage.setItem('visitedCourses', JSON.stringify([...state.visitedCourses]));
                    state.lastActionTime = now;
                    return;
                }
            }
        } catch(e) {}
    }

    // 5. 播放页自动切下一节/未完成章节
    function switchToNextSection() {
        const now = Date.now();
        if (now - state.lastActionTime < CONFIG.actionCooldown) return;
        try {
            if (!location.href.includes('courseLearning/play')) return;
            // 先找绿色"下一节"按钮
            const nextBtn = [...document.querySelectorAll('button, div, .btn')].find(el => 
                el.innerText && el.innerText.trim() === '下一节' && el.offsetParent !== null
            );
            if (nextBtn) {
                log('点击下一节');
                nextBtn.click();
                state.lastActionTime = now;
                return;
            }
            // 找右侧未完成章节
            const unDoneNodes = [...document.querySelectorAll('span, div')].filter(el => 
                el.innerText && el.innerText.trim() === '未完成' && el.offsetParent !== null
            );
            for (let el of unDoneNodes) {
                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();
                        state.lastActionTime = now;
                        return;
                    }
                    parent = parent.parentElement;
                }
            }
        } catch(e) {}
    }

    // 6. 自动答题（答完所有题再提交）
    async function autoAnswerQuiz() {
        try {
            const questions = document.querySelectorAll('[class*=question-item], [class*=topic]');
            if (!questions.length) return;
            log(`检测到${questions.length}道测试题，开始作答`);
            for (let q of questions) {
                const options = q.querySelectorAll('label, .option, .el-radio, .el-checkbox-item');
                const unselected = [...options].filter(o => !o.classList.contains('is-checked'));
                if (unselected.length) {
                    unselected[Math.floor(Math.random() * unselected.length)].click();
                    await new Promise(r => setTimeout(r, 250));
                }
            }
            await new Promise(r => setTimeout(r, 1000));
            // 确认所有题都选完才提交
            const allAnswered = [...questions].every(q => q.querySelectorAll('.is-checked').length > 0);
            if (allAnswered) {
                const submitBtn = [...document.querySelectorAll('button')].find(b => b.innerText.includes('提交'));
                if (submitBtn) {
                    log('所有题目作答完成，提交答卷');
                    submitBtn.click();
                    state.retryCount = 0;
                }
            }
        } catch(e) {}
    }

    // 7. 主循环
    async function mainLoop() {
        closeAllPopups();
        ensureVideoPlaying();
        goToMyCourses();
        pickNextUnfinishedCourse();
        switchToNextSection();
        if (document.body.innerText.includes('单选题') || document.body.innerText.includes('多选题')) {
            await autoAnswerQuiz();
        }
        setTimeout(mainLoop, CONFIG.checkInterval);
    }

    log('v3.0稳定版启动：自动学习所有必修课程');
    setTimeout(mainLoop, 3000);
})();