// ==UserScript==
// @name         UOOCauto
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  UOOC优课联盟，视频自动二倍速播放，离开页面继续播放，自动回答视频中途弹出问题；目前执行的时候页面可能比较奇怪，但是可以无视；如果视频一开始处于停止状态，可以手动点击播放；【有问题可以进行反馈】
// @author       cc
// @include      *
// @grant        none
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';
    const jsName = 'UOOCauto.js';
    const host = window.location.host;
    if (host == 'www.uooc.net.cn') {
        console.log(`excute ${jsName}`);
        let recursive = () => {
            let extraTime = 0;
            let video = document.querySelector('#player_html5_api');
            if (video) {
                video.playbackRate = 2;
                video.autoplay = true;
                let quizLayer = document.querySelector('#quizLayer');
                if (quizLayer) {
                    let sourcc = JSON.parse(document.querySelector('div[uooc-video]').getAttribute('source'));
                    let quizList = sourcc.quiz;
                    let quizIndex = 0;
                    let currentTime = video.currentTime;
                    for (let i = 0; i < quizList.length; i++) {
                        if (Math.abs(eval((quizList[i].set_time) - currentTime)) <= 5) {
                            quizIndex = i;
                            break;
                        };
                    };
                    let quizAnswer = eval(quizList[quizIndex].answer);
                    let quizOptions = quizLayer.querySelector('div.ti-alist');
                    for (let ans of quizAnswer) {
                        let labelIndex = ans.charCodeAt() - 'A'.charCodeAt();
                        quizOptions.children[labelIndex].click();
                    }; // end for
                    quizLayer.querySelector('button').click();
                    extraTime = 1000;
                }; // end if
                if (video.paused && !video.ended) {
                    try {
                        video.play();
                    } catch (e) {
                        // do nothing
                    }
                }; // end if
            }; // end if
            setTimeout(recursive, 250 + extraTime);
        }; // end recursive
        recursive();
    }
})();