// ==UserScript==
// @name         大连理工大学视频倍速+自动切换脚本
// @run-at       document-start
// @version      0.3
// @description  大连理工大学视频倍速+自动切换脚本
// @author       cangxun
// @match        https://learn.open.com.cn/StudentCenter/CourseWare/ShowResource*
// @icon         https://www.google.com/s2/favicons?domain=open.com.cn
// @grant        unsafeWindow
// ==/UserScript==
'use strict';
(function () {
  var rate = 16; //倍速调节,最多16
  var autoNext = true; //是否自动下一个 true为自动，false为不自动
  //可能会出现不自动下一个，重播的情况，需要退出账号后重新登录。请确保网络质量！！
  //----------------------以下为逻辑代码-----------------------------------
  let hookSetInterval = unsafeWindow.setInterval;
  unsafeWindow.setInterval = function (a, b) {
    return hookSetInterval(a, b / rate);
  }

  function addCookie(objName, objValue, objHours) {
    var str = objName + "=" + escape(objValue);
    if (objHours > 0) {
      var date = new Date();
      var ms = objHours * 3600 * 1000;
      date.setTime(date.getTime() + ms);
      str += "; expires=" + date.toGMTString();
    }
    document.cookie = str;
  }
  unsafeWindow.onload = function () {
    //去除暂停广告
    addCookie("qrcode_show_s", 0, 0);
    let iframe = unsafeWindow.document.getElementById('ifr');
    let iframeUrl = iframe.src;
    iframe.onload = function () {
      let videoObj;
      let videoLoad = unsafeWindow.setInterval(function () {
        videoObj = iframe.contentWindow.document.querySelector('video');
        if (videoObj) {
            videoObj.volume = 0;
          videoObj.onloadedmetadata = function () {
            videoObj.playbackRate = rate;
            videoObj.volume = 0;
            console.log("资源加载完成，开始播放！");
           videoObj.play();
            unsafeWindow.clearInterval(videoLoad);
            videoObj.addEventListener('pause', () => {
              if (videoObj.ended) {
                if (autoNext) {
                  document.getElementsByClassName('icon-open-next')[0].click();
                  console.log("自动播放下一个！");
                } else {
                  console.log("当前视频已完成学习！");
                }
              } else if (videoObj.paused) {
                videoObj.play();
                console.log('暂停后继续播放！');
              }
            });
          };
          videoObj.load();
        }
      }, 3000 * rate);
    }
    iframe.src = iframeUrl;
  }
})();