// ==UserScript==
// @name         极致网课助手
// @namespace    http://workbuddy.local/
// @version      2.0.0
// @description  自动播放视频、自动答题。支持 Chrome / Edge / Firefox / 夸克
// @author       WorkBuddy
// @match        *://*.chaoxing.com/*
// @match        *://*.edu.cn/*
// @match        *://*.xueyinonline.com/*
// @match        *://*.zhihuishu.com/*
// @match        *://*.icourse163.org/*
// @match        *://*.icve.com.cn/*
// @match        *://*.zjy2.icve.com.cn/*
// @match        *://*.mooc.icve.com.cn/*
// @match        *://*.course.icve.com.cn/*
// @grant        none
// @run-at       document-idle
// ==UserScript==

(function() {
    'use strict';
    const host = location.hostname;
    let platform = 'unknown';
    if (/\\.chaoxing\\.com$/.test(host) || host.endsWith('.edu.cn') || host.endsWith('.xueyinonline.com')) platform = 'cx';
    else if (/\\.zhihuishu\\.com$/.test(host)) platform = 'zhs';
    else if (/\\.icourse163\\.org$/.test(host)) platform = 'icourse';
    else if (/\\.zjy2\\.icve\\.com\\.cn$/.test(host)) platform = 'zjy';
    else if (/\\.mooc\\.icve\\.com\\.cn$/.test(host)) platform = 'mooc';
    else if (/\\.course\\.icve\\.com\\.cn$/.test(host)) platform = 'course';

    const cfg = {
        autoPlay: true, playSpeed: 1.5, skipAds: true,
        autoNext: true, autoAnswer: true,
        token: '791e4efc2b2f43f2879aa39696937fc2',
        apiEndpoint: 'https://tk.enncy.cn/query'
    };

    const log = (...a) => console.log('[极致网课助手]', ...a);
    const sleep = ms => new Promise(r => setTimeout(r, ms));

    function qsd(sel, doc = document) {
        let el = doc.querySelector(sel);
        if (el) return el;
        for (const iframe of doc.querySelectorAll('iframe')) {
            try { const sub = iframe.contentDocument || iframe.contentWindow?.document; if (sub) { el = qsd(sel, sub); if (el) return el; } } catch(e) {}
        }
        return null;
    }

    function findVideo() {
        if (platform === 'icourse') return document.querySelector('.mooc-video-player video, video');
        return qsd('video');
    }

    function setSpeed(v, s) {
        if (!v) return;
        try { v.playbackRate = s; } catch(e) {}
        try { const p = window.videojs && window.videojs(v.id || v); if (p && typeof p.playbackRate === 'function') p.playbackRate(s); } catch(e) {}
    }

    async function answerQuestion() {
        if (!cfg.autoAnswer) return;
        const title = qsd('.question-text, .question, [class*="question"]')?.textContent?.trim();
        if (!title) return;
        const opts = [];
        document.querySelectorAll('input[type="radio"], input[type="checkbox"], .option').forEach(el => {
            const t = (el.textContent || el.value || '').trim();
            if (t) opts.push(t);
        });
        log('题目:', title.substring(0, 50));
        try {
            const res = await new Promise((resolve, reject) => {
                const xhr = new XMLHttpRequest();
                xhr.open('POST', cfg.apiEndpoint);
                xhr.setRequestHeader('Content-Type', 'application/json');
                xhr.onload = () => { try { resolve(JSON.parse(xhr.responseText)); } catch(e) { reject(e); } };
                xhr.onerror = () => reject(new Error('请求失败'));
                xhr.send(JSON.stringify({token: cfg.token, title, options: opts.join('\\n'), type: 'single', v: '2'}));
            });
            if (res.code === 0) { log('搜不到答案'); return; }
            const answer = res.data?.answer;
            if (!answer) return;
            log('答案:', answer);
            await sleep(500);
            const answers = answer.split('#');
            const optionEls = document.querySelectorAll('input[type="radio"], input[type="checkbox"], .option');
            for (const ans of answers) {
                const target = ans.trim().toUpperCase();
                for (const el of optionEls) {
                    const text = (el.textContent || el.value || '').trim().toUpperCase();
                    if (text.startsWith(target) || text.includes(target)) {
                        if (el.tagName === 'INPUT') { el.checked = true; el.dispatchEvent(new Event('change', {bubbles: true})); }
                        else el.click();
                        log('已选:', target);
                        break;
                    }
                }
            }
            await sleep(500);
            const submitBtn = qsd('.submit, .submit-btn, #submit, [class*="submit"]');
            if (submitBtn) { submitBtn.click(); log('已提交'); }
        } catch(e) { log('答题失败:', e); }
    }

    function nextChapter() {
        switch(platform) {
            case 'cx': {
                const chs = document.querySelectorAll('.posCatalog_level .posCatalog_select');
                if (!chs.length) return false;
                let idx = -1;
                chs.forEach((c,i) => { if (c.classList.contains('posCatalog_active')) idx = i; });
                if (idx < 0 || idx >= chs.length - 1) return false;
                const next = chs[idx+1];
                (next.querySelector('.posCatalog_name') || next).click();
                return true;
            }
            case 'zhs': {
                const list = document.querySelectorAll('#chapterList li');
                if (!list.length) return false;
                let idx = -1;
                list.forEach((li,i) => { if (li.classList.contains('active')) idx = i; });
                if (idx < 0 || idx >= list.length - 1) return false;
                list[idx+1].click();
                return true;
            }
            case 'icourse': {
                const pts = document.querySelectorAll('.sourceList .f-icon.lsicon[data-cid]');
                if (!pts.length) return false;
                let idx = -1;
                pts.forEach((p,i) => { if (p.classList.contains('learned')) idx = i; });
                if (idx < 0 || idx >= pts.length - 1) return false;
                pts[idx+1].click();
                return true;
            }
            case 'zjy':
            case 'mooc':
            case 'course': {
                const cur = qsd('.s_pointerct');
                if (!cur) return false;
                let next = cur.nextElementSibling;
                if (!next) {
                    const p = cur.parentElement;
                    if (p) { next = p.nextElementSibling; if (next) next = next.querySelector('.s_pointerct') || next; }
                }
                if (next) { next.click(); return true; }
                return false;
            }
            default: return false;
        }
    }

    async function main() {
        log('平台识别中...');
        const video = findVideo();
        if (video) {
            log('找到视频，设置速度', cfg.playSpeed);
            setSpeed(video, cfg.playSpeed);
            if (cfg.autoPlay) video.play().catch(e => log('播放失败:', e));
            video.addEventListener('ended', async () => {
                log('视频完毕，切换下一节');
                await sleep(2000);
                nextChapter();
            });
            if (cfg.skipAds) {
                video.addEventListener('timeupdate', () => {
                    if (video.currentTime < 5) video.playbackRate = cfg.playSpeed;
                });
            }
        }
        await answerQuestion();
        let lastUrl = location.href;
        const obs = new MutationObserver(() => {
            if (location.href !== lastUrl) {
                lastUrl = location.href;
                log('页面变化，重新答题');
                setTimeout(() => answerQuestion(), 1500);
            }
        });
        obs.observe(document.body, { childList: true, subtree: true });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', main);
    } else { main(); }
})();