// ==UserScript==
// @name         平顶山学院（青书学堂）自动学习脚本
// @namespace    http://tampermonkey.net/
// @version      2026-06-03
// @description  try to take over the world!
// @author       You
// @match        https://degree.qingshuxuetang.com/pdsu/Student/Course/CourseStudy*
// @match        https://degree.qingshuxuetang.com/pdsu/Student/Course/CourseShow*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=qingshuxuetang.com
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  const url = window.location.href;
  const MIN_STUDY_SECONDS = 5 * 60;
  const VIDEO_SELECTOR = "#vjs_video_3_html5_api";
  const TEXT_SELECTOR = "#easyXDM_default2872_provider";
  console.log("插件加载完成，等待界面渲染");

  const waitForCondition = (getResult) => {
    const result = getResult();

    if (result) {
      return Promise.resolve(result);
    }

    return new Promise((resolve) => {
      const observer = new MutationObserver(() => {
        const result = getResult();

        if (result) {
          observer.disconnect();
          resolve(result);
        }
      });

      observer.observe(document.documentElement, {
        childList: true,
        subtree: true,
      });
    });
  };

  const parseStudySeconds = (text) => {
    const hourMatch = text.match(/(\d+)\s*小时/);
    const minuteMatch = text.match(/(\d+)\s*分钟/);
    const secondMatch = text.match(/(\d+)\s*秒/);

    return (
      (hourMatch ? Number(hourMatch[1]) * 3600 : 0) +
      (minuteMatch ? Number(minuteMatch[1]) * 60 : 0) +
      (secondMatch ? Number(secondMatch[1]) : 0)
    );
  };

  const shouldEnterCourseware = (item) => {
    const mark = item.querySelector(".study_being");

    if (!mark) {
      return true;
    }

    const studiedSeconds = parseStudySeconds(mark.innerText);
    return studiedSeconds < MIN_STUDY_SECONDS;
  };

  const returnToStudyPage = () => {
    const backLink = document.querySelector(".back-link");

    if (backLink) {
      backLink.click();
      return;
    }

    history.back();
  };

  const waitForCoursewareElement = () =>
    waitForCondition(
      () =>
        document.querySelector(VIDEO_SELECTOR) ||
        document.querySelector(TEXT_SELECTOR)
    );

  const onPageLoad = async () => {
    console.log("页面加载完成，开始执行脚本");

    if (url.includes("CourseStudy")) {
      console.log("进入准备阶段");
      const items = await waitForCondition(() => {
        const list = document.querySelector("#list");
        const items = list ? list.querySelectorAll("li > a.node") : [];

        return items.length > 0 ? items : null;
      });

      console.log("获取到课程数量：", items.length);

      for (const item of items) {
        if (shouldEnterCourseware(item)) {
          const mark = item.querySelector(".study_being");
          const studiedSeconds = mark ? parseStudySeconds(mark.innerText) : 0;
          console.log(
            "点击未完成学习时长的视频：" +
              item.querySelector(".title").innerText +
              "，已学习：" +
              studiedSeconds +
              "秒"
          );
          item.click();
          return;
        }
      }
      console.log("所有视频均已播放完毕，结束脚本");
    } else if (url.includes("CourseShow")) {
      console.log("进入学习阶段");
      // 学习阶段
      const coursewareElement = await waitForCoursewareElement();

      if (coursewareElement.matches(TEXT_SELECTOR)) {
        console.log("检测到文本课件，等待5分钟后返回准备页面");
        setTimeout(() => {
          console.log("文本课件等待完成，返回准备页面");
          returnToStudyPage();
        }, MIN_STUDY_SECONDS * 1000);
        return;
      }

      const videoInterval = setInterval(() => {
        const video = document.querySelector(VIDEO_SELECTOR);

        if (!video) {
          console.log("视频元素暂时不可用，继续等待");
          return;
        }

        if (video.paused && video.currentTime === 0) {
          video.play();
          console.log("视频未播放，开始播放视频");
          return;
        }

        if (video.currentTime >= video.duration - 1) {
          console.log("视频播放结束，返回准备页面");
          clearInterval(videoInterval);
          returnToStudyPage();
        }

        if (video.playbackRate === 1) {
          console.log("将视频倍速设置为2倍速");
          video.playbackRate = 2;
        }

        console.log("视频正在播放，当前时间：" + video.currentTime);
      }, 3000);
    }
  };

  // 等待页面加载完成后执行
  if (document.readyState === "complete") {
    onPageLoad();
  } else {
    window.addEventListener("load", onPageLoad);
  }
})();