// ==UserScript==
// @name         重庆智慧教育平台 自动刷课助手
// @namespace    https://www.cqooc.com/
// @version      1.2.1
// @description  在 cqooc.com 学习页自动完成课件观看（快速 / 真实时长 / 自动连播三种模式）
// @author       dsh
// @license      MIT
// @match        https://www.cqooc.com/*
// @match        https://*.cqooc.com/*
// @noframes
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(function () {
  'use strict';

  // ---------------- 基础工具 ----------------
  const API = location.origin + '/api';
  const SALT = '_2Cqooc&#(*@&(';
  const RESP_KEY = '0$0H_3p4$567890F0Kd0?123456789$@';
  const RESP_IV = '0012345900000678';
  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

  // ---------------- 登录态读取 ----------------
  // 站点用 store2 把 token 存在 localStorage["SQLP"]（JSON 字符串），cookie 只作兜底
  function normalizeToken(raw) {
    if (raw === null || raw === undefined || raw === '') return '';
    let v = raw;
    try { v = JSON.parse(raw); } catch (e) { /* 非 JSON，按原文用 */ }
    if (typeof v === 'string') return v;
    return typeof raw === 'string' ? raw : '';
  }

  function readToken() {
    try {
      const v = normalizeToken(localStorage.getItem('SQLP'));
      if (v) return { token: v, from: 'localStorage' };
    } catch (e) { /* 隐私模式可能抛错 */ }
    try {
      const v = normalizeToken(sessionStorage.getItem('SQLP'));
      if (v) return { token: v, from: 'sessionStorage' };
    } catch (e) { /* ignore */ }
    try {
      const m = document.cookie.match(/(?:^|;\s*)SQLP=([^;]+)/);
      if (m) {
        const v = normalizeToken(decodeURIComponent(m[1]));
        if (v) return { token: v, from: 'cookie' };
      }
    } catch (e) { /* ignore */ }
    return { token: '', from: '' };
  }

  function getToken() {
    return readToken().token;
  }

  // ---------------- MD5（浏览器内置无 md5，这里带一份实现） ----------------
  const md5 = (function () {
    function safeAdd(x, y) {
      const lsw = (x & 0xffff) + (y & 0xffff);
      const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
      return (msw << 16) | (lsw & 0xffff);
    }
    function bitRotateLeft(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)); }
    function md5cmn(q, a, b, x, s, t) { return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b); }
    function md5ff(a, b, c, d, x, s, t) { return md5cmn((b & c) | (~b & d), a, b, x, s, t); }
    function md5gg(a, b, c, d, x, s, t) { return md5cmn((b & d) | (c & ~d), a, b, x, s, t); }
    function md5hh(a, b, c, d, x, s, t) { return md5cmn(b ^ c ^ d, a, b, x, s, t); }
    function md5ii(a, b, c, d, x, s, t) { return md5cmn(c ^ (b | ~d), a, b, x, s, t); }
    function binlMD5(x, len) {
      x[len >> 5] |= 0x80 << (len % 32);
      x[(((len + 64) >>> 9) << 4) + 14] = len;
      let a = 1732584193, b = -271733879, c = -1732584194, d = 271733878;
      for (let i = 0; i < x.length; i += 16) {
        const olda = a, oldb = b, oldc = c, oldd = d;
        a = md5ff(a, b, c, d, x[i], 7, -680876936); d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);
        c = md5ff(c, d, a, b, x[i + 2], 17, 606105819); b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);
        a = md5ff(a, b, c, d, x[i + 4], 7, -176418897); d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);
        c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341); b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);
        a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416); d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);
        c = md5ff(c, d, a, b, x[i + 10], 17, -42063); b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);
        a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682); d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);
        c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290); b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);
        a = md5gg(a, b, c, d, x[i + 1], 5, -165796510); d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);
        c = md5gg(c, d, a, b, x[i + 11], 14, 643717713); b = md5gg(b, c, d, a, x[i], 20, -373897302);
        a = md5gg(a, b, c, d, x[i + 5], 5, -701558691); d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);
        c = md5gg(c, d, a, b, x[i + 15], 14, -660478335); b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);
        a = md5gg(a, b, c, d, x[i + 9], 5, 568446438); d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);
        c = md5gg(c, d, a, b, x[i + 3], 14, -187363961); b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);
        a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467); d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);
        c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473); b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);
        a = md5hh(a, b, c, d, x[i + 5], 4, -378558); d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);
        c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562); b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);
        a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060); d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);
        c = md5hh(c, d, a, b, x[i + 7], 16, -155497632); b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);
        a = md5hh(a, b, c, d, x[i + 13], 4, 681279174); d = md5hh(d, a, b, c, x[i], 11, -358537222);
        c = md5hh(c, d, a, b, x[i + 3], 16, -722521979); b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);
        a = md5hh(a, b, c, d, x[i + 9], 4, -640364487); d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);
        c = md5hh(c, d, a, b, x[i + 15], 16, 530742520); b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);
        a = md5ii(a, b, c, d, x[i], 6, -198630844); d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);
        c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905); b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);
        a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571); d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);
        c = md5ii(c, d, a, b, x[i + 10], 15, -1051523); b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);
        a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359); d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);
        c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380); b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);
        a = md5ii(a, b, c, d, x[i + 4], 6, -145523070); d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);
        c = md5ii(c, d, a, b, x[i + 2], 15, 718787259); b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);
        a = safeAdd(a, olda); b = safeAdd(b, oldb); c = safeAdd(c, oldc); d = safeAdd(d, oldd);
      }
      return [a, b, c, d];
    }
    function binl2rstr(input) {
      let output = '';
      for (let i = 0; i < input.length * 32; i += 8) output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xff);
      return output;
    }
    function rstr2binl(input) {
      const output = [];
      for (let i = 0; i < input.length * 8; i += 8) output[i >> 5] |= (input.charCodeAt(i / 8) & 0xff) << (i % 32);
      return output;
    }
    function rstrMD5(s) { return binl2rstr(binlMD5(rstr2binl(s), s.length * 8)); }
    function rstr2hex(input) {
      const hexTab = '0123456789abcdef';
      let output = '';
      for (let i = 0; i < input.length; i++) {
        const x = input.charCodeAt(i);
        output += hexTab.charAt((x >>> 4) & 0x0f) + hexTab.charAt(x & 0x0f);
      }
      return output;
    }
    function str2rstrUTF8(input) { return unescape(encodeURIComponent(input)); }
    return function (s) { return rstr2hex(rstrMD5(str2rstrUTF8(s))); };
  })();

  // ---------------- AES-256-CBC 解密（WebCrypto，自包含，不依赖页面 CryptoJS） ----------------
  function b64ToBytes(b64) {
    const bin = atob(String(b64));
    const out = new Uint8Array(bin.length);
    for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
    return out;
  }

  async function aesDecrypt(b64) {
    const c = typeof crypto !== 'undefined' ? crypto : (typeof window !== 'undefined' ? window.crypto : null);
    if (!c || !c.subtle) throw new Error('当前浏览器不支持 WebCrypto');
    const enc = new TextEncoder();
    const key = await c.subtle.importKey('raw', enc.encode(RESP_KEY), { name: 'AES-CBC' }, false, ['decrypt']);
    const plain = await c.subtle.decrypt({ name: 'AES-CBC', iv: enc.encode(RESP_IV) }, key, b64ToBytes(b64));
    return JSON.parse(new TextDecoder().decode(plain));
  }

  function sign(path, ts) {
    const token = getToken();
    const p = path.startsWith('/pub/') ? path.split('?')[0] : '';
    const raw = p ? '/api' + p + '**2ooc&#(?^&(' + ts : token + SALT + ts;
    return md5(raw);
  }

  async function api(path, { method = 'GET', params, body } = {}) {
    const qs = params ? '?' + new URLSearchParams(
      Object.entries(params).filter(([, v]) => v !== undefined && v !== null).map(([k, v]) => [k, String(v)])
    ).toString() : '';
    const ts = String(Date.now());
    const token = getToken();
    const headers = { ts, sg: sign(path, ts), Accept: 'application/json, text/plain, */*' };
    if (token) headers.SQLP = token;
    if (body !== undefined) headers['Content-Type'] = 'application/json;charset=UTF-8';
    const res = await fetch(API + path + qs, {
      method, headers, credentials: 'include',
      body: body === undefined ? undefined : JSON.stringify(body),
    });
    const text = await res.text();
    let data;
    try { data = JSON.parse(text); } catch { throw new Error('非 JSON 响应: ' + text.slice(0, 120)); }
    if (data.encryption && typeof data.result === 'string' && (data.code === 200 || data.code === 2000)) {
      try {
        data.result = await aesDecrypt(data.result);
      } catch (e) {
        log('响应解密失败: ' + e.message);
      }
    }
    if (data.code === 401) throw new Error('登录已失效，请重新登录 www.cqooc.com');
    return data;
  }

  // ---------------- 数据抓取 ----------------
  function pickCourses(res) {
    const r = res && res.result;
    if (Array.isArray(r)) return r;
    for (const k of ['list', 'records', 'rows', 'data', 'content']) {
      if (r && Array.isArray(r[k])) return r[k];
    }
    return [];
  }

  function walkLessons(tree) {
    const out = [];
    (tree || []).forEach((ch) => {
      (ch.ZLJH || []).forEach((sec) => {
        (sec.KJJH || []).forEach((kj) => {
          if (String(kj.ZT) === '4') return;
          out.push({
            KJID: kj.ID != null ? kj.ID : kj.KJID,
            name: kj.KJMC || kj.NR || kj.MC || '',
            lx: String(kj.LX != null ? kj.LX : ''),
            jd: Number(kj.JD || 0),
            zid: sec.ZJID,
            section: sec.ZJMC || sec.ZJXH || '',
          });
        });
      });
    });
    return out;
  }

  const isCourseware = (lx) => !['2', '5', '6'].includes(lx); // 2测试 5任务 6考试

  // ---------------- 刷课逻辑 ----------------
  const state = { running: false, stop: false, courses: [], lessons: [], current: null };

  async function loadCourses() {
    const res = await api('/student/my/course/list', { params: { pageNum: 1, pageSize: 100 } });
    if (res.code !== 200) throw new Error('获取课程失败: ' + (res.message || res.code));
    state.courses = pickCourses(res);
    return state.courses;
  }

  async function loadLessons(kcid) {
    const res = await api('/student/course/chapter/full/list', { params: { KCID: kcid } });
    if (res.code !== 200) throw new Error('获取章节失败: ' + (res.message || res.code));
    state.lessons = walkLessons(res.result).filter((l) => isCourseware(l.lx));
    return state.lessons;
  }

  async function watchLesson(kcid, lesson, mode) {
    const st = await api('/student/course/lesson/start', { method: 'PUT', params: { KCID: kcid, KJID: lesson.KJID } });
    if (st.code !== 200) throw new Error('start 失败: ' + (st.message || st.code));
    const r = st.result || {};
    const zsc = Number(r.ZSC || 0);
    const ybsc = Number(r.YBSC || 0);
    const bc = Number(r.BC || 15) || 15;
    if (ybsc < 0) return { skipped: true, done: true };
    if (!zsc || zsc < 0) return { skipped: true };
    log(`  开始 ${lesson.name} 时长=${zsc}s 已播=${Math.max(0, ybsc)}s`);
    let n = 0;
    if (mode === 'fast') {
      const targets = [...new Set([0.25, 0.5, 0.75, 1].map((f) => Math.min(zsc, Math.max(1, Math.round(zsc * f)))))];
      for (const t of targets) {
        if (state.stop) return { stopped: true };
        await api('/student/course/lesson/record', { method: 'PUT', params: { KCID: kcid, KJID: lesson.KJID, DQJD: t } });
        n++;
        await sleep(300);
      }
    } else {
      const step = Math.max(1, Math.min(bc, 60));
      let pos = Math.max(0, Math.floor(ybsc));
      while (pos < zsc - 1 && !state.stop) {
        pos = Math.min(pos + step, zsc - 1);
        await api('/student/course/lesson/record', { method: 'PUT', params: { KCID: kcid, KJID: lesson.KJID, DQJD: pos } });
        n++;
        await sleep(Math.min(step * 1000, 60000));
      }
    }
    if (state.stop) return { stopped: true };
    const fin = await api('/student/course/lesson/finish', { method: 'PUT', params: { KCID: kcid, KJID: lesson.KJID } });
    return { n, fin };
  }

  async function run(mode) {
    if (state.running) return;
    state.running = true; state.stop = false;
    try {
      log('扫描课程...');
      const courses = await loadCourses();
      log(`共 ${courses.length} 门课程`);
      for (const c of courses) {
        if (state.stop) break;
        const kcid = c.KCID || c.KC_ID;
        if (!kcid) continue;
        const title = c.KCMC || c.KCM || '';
        log(`课程：${title} (${kcid})`);
        const lessons = await loadLessons(kcid);
        const todo = lessons.filter((l) => l.jd < 90);
        log(`  课件 ${lessons.length} 个，待完成 ${todo.length} 个`);
        for (const l of todo) {
          if (state.stop) break;
          try {
            const res = await watchLesson(kcid, l, mode);
            if (res.skipped) log(`  跳过 ${l.name}（无时长）`);
            else if (res.stopped) break;
            else log(`  完成 ${l.name} 上报${res.n}次 finish=${res.fin && res.fin.code}`);
          } catch (e) {
            log(`  失败 ${l.name}: ${e.message}`);
          }
        }
      }
      log('全部结束');
    } catch (e) {
      log('出错: ' + e.message);
    } finally {
      state.running = false;
    }
  }

  // ---------------- 自动连播（真实播放器模式） ----------------
  // 依据学习页 DOM：.courseware-row 为课件行，.active 为当前课件；video 为播放器
  const auto = { on: false, timer: null, rate: 2, bound: new WeakSet(), noVideoSince: null, advancing: false };

  function nextCoursewareRow() {
    const rows = Array.from(document.querySelectorAll('.courseware-row'));
    if (!rows.length) return null;
    const active = document.querySelector('.courseware-row.active');
    let idx = active ? rows.indexOf(active) : -1;
    for (let i = idx + 1; i < rows.length; i++) {
      if (!rows[i].querySelector('.lock-tag')) return rows[i];
    }
    return null;
  }

  function scheduleAdvance(reason) {
    if (auto.advancing) return;
    auto.advancing = true;
    setTimeout(() => {
      auto.advancing = false;
      if (!auto.on) return;
      const row = nextCoursewareRow();
      if (!row) {
        log('已到最后一节，自动连播结束');
        stopAuto();
        return;
      }
      const name = row.querySelector('.courseware-name');
      log(`→ 下一节：${name ? name.textContent.trim() : '(未命名)'}`);
      row.click();
      auto.noVideoSince = Date.now();
    }, 1800);
  }

  function autoTick() {
    if (!auto.on) return;
    if (!document.querySelector('.course-study-container')) return; // 不在学习页
    const v = document.querySelector('video');
    if (v) {
      auto.noVideoSince = null;
      v.muted = true;
      if (Math.abs(v.playbackRate - auto.rate) > 0.01) v.playbackRate = auto.rate;
      if (!auto.bound.has(v)) {
        auto.bound.add(v);
        v.addEventListener('ended', () => scheduleAdvance('ended'));
      }
      if (v.paused && !v.ended && v.readyState >= 2 && !v.dataset.ckResumed) {
        v.dataset.ckResumed = '1';
        v.play().catch(() => {});
      }
    } else if (auto.noVideoSince === null) {
      auto.noVideoSince = Date.now();
    }
    // 非视频类课件（文档/任务）或加载失败：8 秒后跳过
    if (!v && auto.noVideoSince && Date.now() - auto.noVideoSince > 8000) {
      log('当前课件无播放器，跳过');
      auto.noVideoSince = null;
      scheduleAdvance('no-video');
    }
  }

  function startAuto(rate) {
    if (auto.on) return;
    auto.on = true;
    auto.rate = rate;
    auto.noVideoSince = null;
    log(`自动连播已开启（${rate}x，静音）`);
    auto.timer = setInterval(autoTick, 1000);
    autoTick();
  }

  function stopAuto() {
    auto.on = false;
    if (auto.timer) clearInterval(auto.timer);
    auto.timer = null;
    log('自动连播已停止');
  }

  // ---------------- UI ----------------
  let logBox, logLines = [];
  function log(msg) {
    const line = `[${new Date().toLocaleTimeString()}] ${msg}`;
    logLines.push(line);
    if (logLines.length > 200) logLines.shift();
    if (logBox) logBox.textContent = logLines.join('\n');
    console.log('[cqooc]', msg);
  }

  function buildPanel() {
    const wrap = document.createElement('div');
    wrap.id = 'cqooc-helper';
    wrap.innerHTML = `
      <div class="ck-hd">📚 自动刷课 <span class="ck-close">×</span></div>
      <div class="ck-bd">
        <div class="ck-row">
          <button data-act="scan">扫描课程</button>
          <button data-act="fast">快速刷课</button>
          <button data-act="real">真实播放刷课</button>
          <button data-act="stop">停止</button>
        </div>
        <div class="ck-row">
          <label>倍速
            <select data-act="rate">
              <option>1</option><option selected>2</option><option>4</option>
            </select>
          </label>
          <button data-act="auto">自动连播 ▶</button>
          <span class="ck-hint">在本页打开要刷的课件后点此</span>
        </div>
        <div class="ck-stat"></div>
        <pre class="ck-log"></pre>
      </div>`;
    const style = document.createElement('style');
    style.textContent = `
      #cqooc-helper{position:fixed;right:16px;bottom:16px;width:420px;max-height:70vh;z-index:999999;
        background:#fff;border:1px solid #d9d9d9;border-radius:8px;box-shadow:0 6px 24px rgba(0,0,0,.18);
        font:12px/1.6 -apple-system,"Microsoft YaHei",sans-serif;display:flex;flex-direction:column}
      #cqooc-helper .ck-hd{padding:8px 12px;background:#1890ff;color:#fff;border-radius:8px 8px 0 0;
        display:flex;justify-content:space-between;font-weight:600}
      #cqooc-helper .ck-close{cursor:pointer}
      #cqooc-helper .ck-bd{padding:10px;display:flex;flex-direction:column;gap:8px;min-height:0}
      #cqooc-helper .ck-row{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
      #cqooc-helper .ck-hint{color:#999;font-size:11px}
      #cqooc-helper button{padding:4px 10px;border:1px solid #d9d9d9;border-radius:4px;background:#fafafa;cursor:pointer}
      #cqooc-helper button:hover{color:#1890ff;border-color:#1890ff}
      #cqooc-helper .ck-log{flex:1;overflow:auto;max-height:40vh;margin:0;background:#f6f8fa;
        padding:6px;border-radius:4px;white-space:pre-wrap;word-break:break-all}
    `;
    document.head.appendChild(style);
    document.body.appendChild(wrap);
    logBox = wrap.querySelector('.ck-log');
    wrap.querySelector('.ck-close').onclick = () => wrap.remove();
    wrap.querySelector('[data-act="scan"]').onclick = async () => {
      try {
        const cs = await loadCourses();
        log(`共 ${cs.length} 门课程：` + cs.map((c) => c.KCMC || c.KCM || c.KCID).join('、'));
      } catch (e) { log(e.message); }
    };
    wrap.querySelector('[data-act="fast"]').onclick = () => run('fast');
    wrap.querySelector('[data-act="real"]').onclick = () => run('real');
    wrap.querySelector('[data-act="stop"]').onclick = () => { state.stop = true; log('已请求停止'); };
    wrap.querySelector('[data-act="auto"]').onclick = (e) => {
      if (auto.on) { stopAuto(); e.target.textContent = '自动连播 ▶'; return; }
      const sel = wrap.querySelector('[data-act="rate"]');
      startAuto(Number(sel.value) || 2);
      e.target.textContent = '停止连播 ■';
    };
    const tk = readToken();
    log(`就绪，token=${tk.token ? '已检测到（' + tk.from + '）' : '未检测到（请先登录）'}`);
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', buildPanel);
  else buildPanel();

  // 调试 / 自动化测试入口
  try { window.__CQOOC_HELPER = { api, sign, md5, aesDecrypt, getToken, loadCourses, loadLessons, watchLesson, run, state, startAuto, stopAuto, autoTick, nextCoursewareRow, auto }; } catch (e) { /* ignore */ }
})();