// ==UserScript==
// @name         chaoxing学习通，自动两倍速刷视频，禁止自动暂停，自动下一章
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  此脚本仅适用于 mooc1.chaoxing.com 这个网址
// @author       glitchboyl
// @match        *://mooc1.chaoxing.com/*
// @icon         https://www.google.com/s2/favicons?domain=chaoxing.com
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    function fn() {
        const videos = [];
        const flags = new Proxy([], {
          get(target, key, receiver) {
            return Reflect.get(target, key, receiver);
          },
          set(target, key, value, receiver) {
            const result = Reflect.set(target, key, value, receiver);
            if (target.every((f) => f)) {
              document.querySelector(".jb_btn.prev_next.next")?.click()
              setTimeout(() => window.reload(), 500)
            }
            return result;
          },
        });
        const frames =
          Array.from(window?.frames?.[3]?.document.querySelectorAll("iframe") || []);
        Promise.all(
          frames?.map((frame) => {
            return new Promise((resolve) => {
              setTimeout(() => {
              const video =
                    frame.contentWindow.document.getElementById(
                      "video_html5_api"
                    );
                  if (video) {
                    flags.push(false);
                    videos.push(video);
                    resolve();
                  }
              }, 800)
            });
          })
        ).then(() => {
          let i = 0;
          function play() {
            const video = videos[i];
            if (!video) return;
            video.volume = 0;
            video.autoplay = true;
            video.defaultPlaybackRate = 2;
            video.playbackRate = 2;

            video.onpause = () =>
              !video.ended && setTimeout(() => video.play());
            video.onended = () => {
              flags[i] = true;
              video.onwaiting = null;
              video.onpause = null;
              clearInterval(timer);
              if (i < videos.length) {
                i++;
                play();
              }
            };
            let timer = setInterval(() => {
              if (!video.paused) video.play();
            }, 1000);
            video.play();
          }
          play();
        });
      }
      window.onload = fn;
})();