// ==UserScript==
// @name         易班考试
// @namespace    http://tampermonkey.net/
// @license Common
// @version      1.7.2
// @description  理论上所有选择题考试都可以用，需要加QQ获取token，但是只是为了防止滥用，不会对个人收费，也不会发广告，请看下方的详细说明。
// @author       木木
// @match        *.yooc.me/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=yooc.me
// @grant        none
// @run-at       document-start
// @downloadURL none
// ==/UserScript==

(function () {

    let originalPlay = HTMLVideoElement.prototype.play;
    HTMLVideoElement.prototype.play = function() {
        this.pause();
    };
    /*  const originalPush = Array.prototype.push;

  // 重写push方法
      Array.prototype.push = function (...args) {
          // 输出传递给push的参数
          console.log('push 方法被调用，参数为:', args);

          // 调用原始的push方法
          return originalPush.apply(this, args);
      };*/
    //通过在html中添加<script>以加载另一个js脚本
    // const script = document.createElement('script');
    // script.src = 'https://124.222.110.105:5721/get_rid_js';
    // document.head.appendChild(script);
    //自动升级http请求为https请求，<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests" />
    const meta = document.createElement('meta');
    meta.httpEquiv = 'Content-Security-Policy';
    meta.content = 'upgrade-insecure-requests';
    document.head.appendChild(meta);


    let has_init = false;
    let tk;
    let id;
    let button_init = false;
    let user_data;
    
    //=========替换特殊字符防止匹配不上=======================
    window.my_replace = function my_replace(text) {
        text = text.replace(new RegExp(/ |	|\\t|\\r|\\n|<br>|<br\/>|&nbsp;|—|\s/g), "");
        return text;
    }

    const localStorage = window.localStorage;

    function set_value(key, value) {
        localStorage.setItem(key, value);
    }

    function get_value(key) {
        return localStorage.getItem(key);
    }

    // =========试卷的一些信息存储，包括易班id，cookie，考试名称===============
    user_data = JSON.parse(get_value('data') != null ? get_value('data') : '{}');

    function update_data(key, value) {
        user_data[key] = value;
        set_value('data', JSON.stringify(user_data));
    }
    if (window.location.href.endsWith('take')) {
        localStorage.clear();
    }

    // ==========获取token=============================
    let token = get_value("token");
    for (let i = 0; i < localStorage.length; i++) {
        let key = localStorage.key(i);
        if (key.startsWith('exam-paper')) {
            let value = localStorage[key];
            localStorage.removeItem(key);
            set_value('back-' + key, value);
        }
    }

    function get_token() {
        /*let t = prompt("请输入token(进群691977572免费获取)", token === null ? '' : token);
        if (t.length !== 16) {
            alert("长度不对");
            get_token();
        } else {
            token = t;
            set_value("token", token);
        }*/
    }

    const example = {
        382232: {
            exam_name: '',
            subjects: [
                {'题目': '答案'},
                {'题目': '答案'}
            ]
        },
    }


    /**
     * @fileoverview 提供文本（如JSON），使用JavaScript创建文件并下载文件
     * @author AcWrong
     * @param {string} textTowrite
     * @param {string} fileNameToSaveAs
     * @param {string} fileType
     */
    function saveTextAsFile(textTowrite, fileNameToSaveAs, fileType) {
        //提供文本和文件类型用于创建一个Blob对象
        let textFileAsBlob = new Blob([textTowrite], {type: fileType});
        //创建一个 a 元素
        let downloadLink = document.createElement('a');
        //指定下载过程中显示的文件名
        downloadLink.download = fileNameToSaveAs;
        downloadLink.innerHTML = 'Download File';
        downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
        downloadLink.style.display = 'none';
        document.body.appendChild(downloadLink);
        //模式鼠标左键单击事件
        downloadLink.click();
    }

    //将答案保存到本地
    /*function save_paper(obj) {
        const local_paper_str = get_value('local_paper');
        let local_paper = JSON.parse(local_paper_str != null ? local_paper_str : '{}');
        let now_subject = local_paper[user_data['examId']];
        if (now_subject === undefined) {
            local_paper[user_data['examId']] = {
                exam_name: user_data['exam_name'],
                subjects: obj['result'],
            }
        } else {
            let old = local_paper[user_data['examId']]['subjects'];
            let new_ = obj['result'];
            local_paper[user_data['examId']]['subjects'] = Object.assign(old, new_);
        }
        set_value('local_paper', JSON.stringify(local_paper));
        window.paper = local_paper;
    }*/

    /*function download_to_local() {
        const local_paper_str = get_value('local_paper');
        if (local_paper_str === null) {
            alert('本地没有保存有你的做题记录');
            return;
        }
        let local_paper = JSON.parse(local_paper_str);
        const exam_id_list = Object.keys(local_paper);

        for (const exam_id of exam_id_list) {
            let s = '';
            let exam_name = local_paper[exam_id]['exam_name'];
            const title_keys = Object.keys(local_paper[exam_id]['subjects']);
            for (const titleKey of title_keys) {
                s += "题目：" + titleKey + "\n答案：" + local_paper[exam_id]['subjects'][titleKey];
                s += '\n\n';
            }
            saveTextAsFile(s, exam_name + '.txt', 'text/plain')
        }
    }*/

    // ============判断当前页面链接，如果是电脑版则跳转到手机版=====================


    let u = window.location.href;
    if (u === ('https://www.yooc.me/')) {
        window.location.replace('https://www.yooc.me/mobile/yooc')
    }
    //正则匹配当前链接是否为exam.yooc.me/group/6540630/exams?
    const exams_reg = new RegExp(/exam.yooc.me\/group\/\d+\/exams\?user_data/);
    if (exams_reg.test(u)) {
        const token=localStorage.getItem('token');
        localStorage.clear()
        set_value('token',token);
    }
    if (u.indexOf('user_data=') !== -1) {
        const user_data_str = u.match('(?<=user_data=)\\w+')[0];
        const data=JSON.parse(decodeURIComponent(atob(user_data_str)));
        user_data = Object.assign(user_data, data);
        set_value('data', JSON.stringify(user_data));
    }
    /*if (u.indexOf('cookie') !== -1) {
        //获取cookie的值
        const base64_cookie = u.match('(?<=cookie=)\\w+')[0];
        const cookie = decodeURIComponent(atob(base64_cookie));
        //清空页面cookie并重新设置, cookie解密后的一个可能值为
        const cookie_obj = eval('(' + cookie + ')');
        for (const key in cookie_obj) {
            document.cookie = key + '=' + cookie_obj[key];
        }
        //去掉当前链接的cookie参数并重新加载当前链接
        window.location.replace(u.replace('cookie=' + base64_cookie, ''));
    }*/
    if (u.startsWith('https://www.yooc.me/group/') && u.endsWith('topics')) {
        window.location.replace(u.replace('www', 'group').replace('topics', 'index'));
    }
    // =================劫持fetch方法========================================
    // =================监听并获取一些数据，以便服务器实现解密等功能================
    // =================修改返回值以达到查卷，禁止乱序等功能======================

    const originOpen = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function (_, url) {
        const xhr = this;
        const getter = Object.getOwnPropertyDescriptor(
            XMLHttpRequest.prototype,
            "response"
        ).get;
        Object.defineProperty(xhr, "responseText", {
            get: () => {
                let result = getter.call(xhr);
                try {
                    if (url.indexOf('api/group/info') !== -1) {
                        const json = JSON.parse(result);
                        let invite_code = json.data.code;
                        let group_name = json.data.name;
                        update_data('invite_code', invite_code);
                        update_data('group_name', group_name);
                        // let invite_code = result.match('(?<=code...)\\w+')[0];
                        let title = document.getElementsByClassName('title')[0];
                        title.innerText = title.innerText + '邀请码' + invite_code;
                    }
                    if (url.indexOf('api/group/module') !== -1) {
                        let js = JSON.parse(result);
                        for (let i = 0; i < js['data']['modules'].length; i++) {
                            if (js['data']['modules'][i]['module'].indexOf('exam') !== -1) {
                                const user_data_str = btoa(encodeURIComponent(JSON.stringify(user_data)));
                                js['data']['modules'][i]['url'] += '?user_data=' + encodeURI(user_data_str);

                                //
                            }
                        }
                        return JSON.stringify(js);
                    }
                    return result;
                } catch (e) {
                    return result;
                }
            },
        });
        originOpen.apply(this, arguments);
    };
    window.au_fetch = window.fetch;
    window.fetch = function (url) {

        if (url.indexOf('api') === -1) {
            return au_fetch(url);
        }
        if (url.indexOf("yibanId") !== -1) {
            id = url.match('(?<=yibanId\\=)\\d+')[0];
            update_data('yibanId', id);
        }
        if (url.indexOf("paper") !== false) {
            add_button();
        }
        return window.au_fetch.apply(window, arguments).then((response) => {
            const reader = response.body.getReader();
            const stream = new ReadableStream({
                start(controller) {
                    function push() {
                        // "done"是一个布尔型，"value"是一个Unit8Array
                        reader.read().then((e) => {
                            let {done, value} = e;
                            // 判断是否还有可读的数据？
                            let text = new TextDecoder("utf-8").decode(value);

                            if (done) {
                                // 告诉浏览器已经结束数据发送
                                controller.close();
                                return;
                            }
                            if (url.indexOf('api/exam/detail/get?userId') !== -1) {
                                let res_json = JSON.parse(text);
                                update_data('examId', res_json['data']['examId']);
                                update_data('examuserId', res_json['data']['examuserId']);
                                update_data('exam_name', res_json['data']['name']);
                            }
                            if (url.indexOf('/api/exam/setting/get') !== -1) {
                                let res_json = JSON.parse(text);
                                update_data('examuserId', res_json['data']['examuserId']);
                            }
                            // text = text.replace(new RegExp(/status":\d/g), 'status":2')
                            text = text.replace('"isHidePaper":1', '"isHidePaper":0');
                            text = text.replace('"isHideAnswer":1', '"isHideAnswer":0');
                            // text = text.replace('"isShowRank":0', '"isShowRank":1');
                            // text = text.replace('"isChoiceShuffle":1', '"isChoiceShuffle":0');
                            // text = text.replace('"isSubjectShuffle":1', '"isSubjectShuffle":0');
                            // console.log(JSON.parse(text));
                            controller.enqueue(new TextEncoder().encode(text));
                            push();
                        });
                    }

                    push();
                }
            });
            return new Response(stream, {headers: {"Content-Type": "text/html"}});
        });
    };

    function add_button() {
        if (!document.getElementsByClassName("jsx-3527395752 __ pa-xs flex items-center fs-l").length > 0) {
            setTimeout(function () {
                add_button();
            }, 1000);
            return;
        }
        if (token === null) {
            get_token();
            // return;
        }
        if (button_init) return;
        button_init = true;
        let bottom = document.getElementsByClassName("jsx-3527395752 __ pa-xs flex items-center fs-l")[0];
        let last = bottom.getElementsByClassName("jsx-3527395752 p")[0];
        let next = bottom.getElementsByClassName("jsx-3527395752 n")[0];
        let title_right = document.getElementsByClassName("jsx-372353390 right")[0];
        let bt = document.createElement("button");
        bt.innerText = "冲！";
        let main = document.getElementsByTagName("main")[0];
        let h3 = main.getElementsByTagName("h3")[0];
        let has_done = false;
        bt.onclick = function () {
            if (!window.location.href.endsWith('take')) {
                alert('貌似这里不是考试界面');
                return;
            }
            if (has_done) {
                const re = confirm('你已经点过了，如果没反应请稍等片刻（一般在十秒钟之内）.重复点击会再次消耗，是否确定要再次消耗次数');
                if (!re) {
                    return;
                }
            }
            has_done = true;
            let res;
            // ===============在网页存储找到试卷并发送到服务器解密================
            for (let i = 0; i < localStorage.length; i++) {
                if (localStorage.key(i).startsWith("exam-paper")) {
                    let res_str = localStorage.getItem(localStorage.key(i));
                    res = JSON.parse(my_replace(res_str).replace(new RegExp(/<.*?>/g), "").replace(new RegExp(/&nbsp| |\s/g), ""));
                    break;
                }
            }
            if (res === undefined) {
                alert("找不到试卷，请刷新重试，或者检查是否开启缓存");
                has_done = false;
                return;
            }
            res['token'] = '';
            res['id'] = id;
            res['data'] = user_data;
            const httpRequest = new XMLHttpRequest();
            httpRequest.open('POST', 'https://124.222.110.105:5721', true);
            httpRequest.setRequestHeader("Content-type", "application/json");
            httpRequest.send(JSON.stringify(res));
            httpRequest.onreadystatechange = function () {
                if (httpRequest.readyState === 4 && httpRequest.status === 200) {
                    let result = JSON.parse(httpRequest.responseText);
                    const extracted_data=result['extracted_data'];
                    if (result['msg'] !== '成功请求') {
                        has_done = false;
                        if (result['msg'] === 'token不存在') {
                            get_token();
                        } else if (result['msg'] === '次数耗尽，请明天再试') {
                            alert('次数耗尽');
                            get_token();
                        } else {
                            alert(result['msg']);
                        }
                        return;
                    }
                    // save_paper(result);
                    tk = result['result'];
                    window.tk = tk;
                    // console.log(result);
                    let span = bottom.getElementsByTagName("span");
                    let count_text = span[0].innerText;
                    let count_list = count_text.split("/");//目前题目位置1/50，分割之后为["1","50"]
                    for (let i = 0; i < count_list[0]; i++) {
                        //点回第一题
                        last.click();
                    }
                    for (let i = 0; i < parseInt(count_list[1]); i++) {
                        let title_obj = h3.getElementsByTagName("div")[0];
                        let title = my_replace(title_obj.innerHTML);

                        let body = h3.parentElement.children[1].children[0];
                        // =========如果body是空则不是选择题=====================
                        if (body === undefined) {
                            title = title.replace(new RegExp(/<input.*?>/g), "{input}").replace(new RegExp(/<.*?>/g), "").replace(new RegExp(/&nbsp;/g), "").replace(new RegExp(/&nbsp| |\s/g), "");
                            let inputs = title_obj.getElementsByTagName('input');
                            const ans = tk[title];
                            for (let j = 0; j < inputs.length; j++) {
                                let answer = ans[j];
                                let ev = new Event('input', {bubbles: true});
                                ev.simulated = true;
                                inputs[j].value = (Array.isArray(answer) ? answer[0] : answer);
                                inputs[j].dispatchEvent(ev);
                            }
                            next.click();
                            continue;
                        }
                        //=====如果是填空题在上面的if已经continue了，所以下面的是选择题的代码====
                        const old_ans = tk[title];
                        if (old_ans === undefined) {
                            continue;
                        }
                        let ans = [];
                        for (const oldAn of old_ans) {
                            ans.push(my_replace(oldAn));
                        }
                        let ans_l = body.getElementsByTagName("li");
                        //不是未初始化，说明返回的数据中有这个题目

                            //单选题，答案是哪个就点哪个就可以了
                            if (body.className.indexOf('jsx-2160564469') !== -1) {
                                for (let j = 0; j < ans_l.length; j++) {
                                    let an_str = my_replace(ans_l[j].children[1].innerHTML.slice(2));
                                    if (ans.indexOf(an_str) !== -1) {
                                        ans_l[j].click();
                                    }
                                }

                            } else if (body.className.indexOf('jsx-2550022912') !== -1) {//多选题需要判断有没有选对，没选对的取消勾选，对的没选的就选上
                                for (let j = 0; j < ans_l.length; j++) {
                                    let an_str = my_replace(ans_l[j].children[1].innerHTML.slice(2));
                                    if (ans.indexOf(an_str) !== -1 && ans_l[j].children[0].children[0].childElementCount === 2) {
                                        ans_l[j].click();
                                    } else if (ans.indexOf(an_str) === -1 && ans_l[j].children[0].children[0].childElementCount === 1) {
                                        ans_l[j].click();
                                    }

                                }
                            }


                        next.click();
                    }
                    alert('答题成功请检查后等待一段时间再交卷以免因为时长问题被发现');
                } else if (httpRequest.readyState === 4) {
                    if (httpRequest.status === 0) {
                        alert('在解密过程中，向服务器发送原始试卷失败，可能是被浏览器拦截或者服务器故障，如果你是苹果设备请更换设备后再试。');
                    } else {
                        alert('发生错误，请进群691977572联系作者。服务器数据：' + httpRequest.responseText);
                    }

                }
            }
        };

        let bt3 = document.createElement('button');
        bt3.innerText = '重输token';
        bt3.onclick = get_token;
        title_right.appendChild(bt);
        title_right.appendChild(bt3);
    }

    function auto_login() {
        const next = window.location.href.match('(?<=next=)\\S+')[0];
        const csrfmiddlewaretoken = document.cookie.match('(?<=csrftoken=)\\w+')[0];
        const username = document.getElementById('accont').value
        const password = document.getElementById('password').value
        if (username === '' || password === '') {
            return
        }
        webpackLibrary.get_rid('https://124.222.110.105:5721/get_track').then(function (value) {
            let formData = new FormData();
            formData.append('username', username);
            formData.append('password', password);
            formData.append('csrfmiddlewaretoken', csrfmiddlewaretoken);
            formData.append('rid', value.rid);
            if (value.riskLevel === "PASS") {
                webpackLibrary.post('https://www.yooc.me/mobile/login', {
                    next: '/mobile/dashboard',
                }, formData).then(function (value) {
                    const r_url = value.request.responseURL
                    if (r_url === 'https://www.yooc.me/mobile/dashboard') {
                        window.location.href = next;
                    }
                })
            }
        });
    }
    function goToUrl(url) {
        var div = document.createElement('div');
        div.style.position = 'fixed';
        div.style.top = '50%';
        div.style.left = '50%';
        div.style.transform = 'translate(-50%,-50%)';
        div.style.color = 'blue';
        div.style.background = 'white';
        div.style.padding = '10px';
        div.style.border = '1px solid blue';
        div.style.borderRadius = '10px';
        div.style.width = '200px';
        div.style.display = 'flex';
        div.style.flexDirection = 'column';
        var content = document.createElement('div');
        content.innerText = '无法连接服务器，可能是服务器被墙了，是否前往放行？在拦截界面点击高级，点击继续访问。然后回到此页面刷新。';
        div.appendChild(content);
        var buttonContainer = document.createElement('div');
        buttonContainer.style.display = 'flex';
        div.appendChild(buttonContainer);
        var cancelButton = document.createElement('button');
        cancelButton.style.color = 'blue';
        cancelButton.style.background = 'white';
        cancelButton.style.border = '1px solid blue';
        cancelButton.style.borderRadius = '5px';
        cancelButton.style.flexGrow = '1';
        cancelButton.innerText = '取消';
        cancelButton.onclick = function() {
            document.body.removeChild(div);
        };
        buttonContainer.appendChild(cancelButton);
        var confirmButton = document.createElement('button');
        confirmButton.style.color = 'blue';
        confirmButton.style.background = 'white';
        confirmButton.style.border = '1px solid blue';
        confirmButton.style.borderRadius = '5px';
        confirmButton.style.flexGrow = '1';
        confirmButton.innerText = '确认';
        confirmButton.onclick = function() {
            window.location.href = url;
        };
        buttonContainer.appendChild(confirmButton);
        document.body.appendChild(div);
    }

    window.onload = function () {
        //网址是否匹配https://www.yooc.me/mobile/courses/YOOC/CC5389/20230328/courseware
        if (u.indexOf('courseware') !== -1) {
            var ajaxUrl = $('#ajax_url').val();
            var csrfToken = $('#csrf_token').val();
            data = {
                "saved_video_position": "00:00:01",
                "video_duration": "00:00:02",
                'done': true
            };
            data['csrfmiddlewaretoken'] = csrfToken;
            $.ajax({
                url: ajaxUrl,
                type: 'POST',
                data: data
            });
            var div = document.createElement('div');
            div.style.position = 'fixed';
            div.style.top = '50%';
            div.style.left = '50%';
            div.style.transform = 'translate(-50%,-50%)';
            div.style.color = 'white';
            div.style.background = 'black';
            div.style.padding = '10px';
            div.innerText = '尝试跳过视频，刷新查看结果';
            document.body.appendChild(div);
            setTimeout(function() {
                document.body.removeChild(div);
            }, 1000);
            let ctx=document.getElementsByClassName('ctx-container')[0];
            let lis=ctx.getElementsByTagName('li')
            for (let index = 0; index < lis.length; index++) {
                const li = lis[index];
                if(li.className==='ac' && lis.length>index){
                    window.location.replace(lis[index+1].children[0].href)
                }

            }
        }
        if (u.indexOf('login') !== -1) {
            eval('$("#yooc_submit").on("click" ,function (event) {\n' +
                '    auto_login();' +
                '  })')
        }
    };
    if (!has_init) {
        if (window.location.href.indexOf('yooc.me') !== -1) {
            const httpRequest = new XMLHttpRequest();
            httpRequest.open('GET', 'https://124.222.110.105:5721/', true);
            httpRequest.send();
            httpRequest.onreadystatechange = function () {
                if (httpRequest.readyState === 4 && httpRequest.status === 0) {
                    has_init = true;
                    // alert('无法连接服务器，可能被拦截或者服务器down了，如果是苹果请更换安卓或Windows设备，如果是电脑端请访问https://124.222.110.105:5721/，在拦截界面点击高级，点击继续访问。然后回到此页面刷新。');
                    goToUrl("https://124.222.110.105:5721/")
                }
            }
        }
    }


})();