// ==UserScript==
// @name         山东教师研修2026-播放与章节助手
// @namespace    local.qlteacher.helper
// @version      3.0.0
// @description  自动正常播放、完成后切换视频章节；遇到题目提醒人工处理。
// @match        https://yxjc.qlteacher.com/project/gz2026/*
// @match        https://yxjc.qlteacher.com/learning/gz2026/*
// @match        https://player.qlteacher.com/learning/*
// @grant        GM_getValue
// @grant        GM_setValue
// @run-at       document-end
// @noframes
// ==/UserScript==

(() => {
    'use strict';
    const LIST = 'https://yxjc.qlteacher.com/project/gz2026/lesson/learn';
    const KEY = 'qlteacher2026.worker.v3';
    const id = `${Date.now()}-${Math.random().toString(36).slice(2)}`;
    const isPlayer = location.hostname === 'player.qlteacher.com';
    const isList = location.pathname === '/project/gz2026/lesson/learn';
    let running = false, busy = false, nextAction = 0, lastPlay = 0;
    let lastUrl = location.href, completionSince = 0, pending = false;
    const finished = new Set();
    const panel = document.createElement('div');
    panel.style.cssText = 'position:fixed;right:16px;bottom:16px;z-index:2147483647;background:#fff;color:#222;border:1px solid #aaa;border-radius:10px;padding:12px;max-width:320px;font:14px/1.6 sans-serif;box-shadow:0 2px 12px #0003';
    const status = document.createElement('div');
    const button = document.createElement('button');
    button.textContent = '启动助手';
    panel.append(status, button);
    document.body.append(panel);
    const say = text => { status.textContent = text; };
    const text = e => (e?.innerText || '').replace(/\s+/g, '').trim();
    const visible = e => !!e && e.getClientRects().length > 0 && getComputedStyle(e).visibility !== 'hidden';
    const lease = () => GM_getValue(KEY, null);
    const active = value => value && Date.now() - value.time < 120000;
    function release() {
        if (lease()?.id === id) GM_setValue(KEY, null);
    }
    function stop(message) {
        running = false;
        release();
        button.textContent = '启动助手';
        say(message);
    }
    function start() {
        const owner = lease();
        if (active(owner) && owner.id !== id) {
            say('另一个标签页正在处理课程，请先在那里停止助手。');
            return;
        }
        running = true;
        GM_setValue(KEY, { id, time: Date.now(), pending: false });
        button.textContent = '停止助手';
        say('已启动');
    }
    button.onclick = () => running ? stop('已停止助手；视频可自行暂停。') : start();
    say('待启动；请先禁用旧脚本，避免两个脚本同时操作。');

    // 列表点击会打开新页。仅允许这个新播放器接管一次，避免重复开课。
    if (isPlayer || (!isList && location.hostname === 'yxjc.qlteacher.com')) {
        const owner = lease();
        if (active(owner) && owner.pending) {
            running = true;
            pending = !isPlayer;
            GM_setValue(KEY, { id, time: Date.now(), pending: !isPlayer });
            button.textContent = '停止助手';
        }
    }

    function questionVisible() {
        return [...document.querySelectorAll('input[type="radio"],input[type="checkbox"],.ant-radio,.ant-checkbox')]
            .some(e => visible(e) || visible(e.closest('label')))
            || [...document.querySelectorAll('.segmented-text-ellipsis')].some(e => visible(e) && text(e) === '测试题');
    }
    function click(el) {
        nextAction = Date.now() + 6000;
        el.click();
    }
    async function tick() {
        if (!running || busy) return;
        busy = true;
        try {
            const owner = lease();
            if (active(owner) && owner.id !== id) {
                running = false;
                button.textContent = '启动助手';
                say('已交由新课程标签页处理。');
                return;
            }
            GM_setValue(KEY, { id, time: Date.now(), pending });
            if (location.href !== lastUrl) {
                lastUrl = location.href;
                completionSince = 0;
                nextAction = Date.now() + 4000;
            }
            if (Date.now() < nextAction) return;
            if (isList) {
                if (pending) {
                    stop('新课程未接管，请检查是否被拦截弹窗，或在播放器页启动助手。');
                    return;
                }
                const buttons = [...document.querySelectorAll('button')].filter(e => visible(e) && !e.disabled);
                const target = buttons.find(e => text(e) === '继续学习') || buttons.find(e => text(e) === '开始学习');
                if (!target) { say('未找到待学习按钮，请核对课程状态。'); return; }
                pending = true;
                GM_setValue(KEY, { id, time: Date.now(), pending: true });
                nextAction = Date.now() + 60000;
                target.click();
                say('正在打开课程，等待播放器接管……');
                return;
            }
            if (!isPlayer) { say('等待平台自动跳转到播放器……'); return; }
            if (questionVisible()) {
                document.querySelector('video')?.pause();
                say('发现题目，请自行作答；完成后助手会继续。');
                return;
            }
            if ([...document.querySelectorAll('.ant-modal,.ant-modal-confirm,.ant-drawer-open')].some(visible)) {
                say('发现弹窗，请先处理弹窗。');
                return;
            }
            const complete = [...document.querySelectorAll('.count-down')].some(e => visible(e) && /^已完成(?:学习)?$/.test(text(e)));
            if (complete) {
                if (!completionSince) completionSince = Date.now();
                if (Date.now() - completionSince < 3000) return;
                const rows = [...document.querySelectorAll('li.ant-list-item')].filter(e => e.querySelector('[aria-label="play-circle"]') && e.querySelector('ellipsis[title]'));
                const title = document.querySelector('h1')?.innerText.trim();
                const index = rows.findIndex(e => e.querySelector('ellipsis')?.getAttribute('title') === title);
                if (index < 0) { stop('本节已完成，但无法定位当前章节，请人工确认。'); return; }
                finished.add(title);
                const next = rows.slice(index + 1).find(e => !finished.has(e.querySelector('ellipsis').getAttribute('title')));
                if (next) {
                    say('本节已完成，切换下一视频章节……');
                    completionSince = 0;
                    click(next);
                } else {
                    stop('本课程视频章节已完成，请核对资料或测试要求，再返回列表启动下一课。');
                    const back = document.createElement('a');
                    back.href = LIST;
                    back.textContent = '返回课程列表';
                    panel.append(back);
                }
                return;
            }
            completionSince = 0;
            const video = document.querySelector('video');
            if (!video) { say('等待视频加载；非视频内容请人工处理。'); return; }
            if (video.error) { say('视频加载失败，请检查网络。'); return; }
            if (video.ended) { say('视频已结束，等待平台确认完成。'); return; }
            if (video.paused && Date.now() - lastPlay > 8000) {
                lastPlay = Date.now();
                video.muted = true;
                try { await video.play(); }
                catch { say('浏览器阻止自动播放，请手动点击一次播放。'); return; }
            }
            say(video.paused ? '等待播放……' : '正常速度静音播放中；遇题目会提醒。');
        } catch (error) {
            say(`处理失败：${error.message}`);
            console.error('[研修助手]', error);
            nextAction = Date.now() + 8000;
        } finally { busy = false; }
    }
    setInterval(tick, 1500);
})();