// ==UserScript==
// @name                易班自动答题 ᴘʀᴏᴡʟ
// @namespace           https://bbs.tampermonkey.net.cn/
// @version             1.8
// @description         通过解密网页答题内存做到百分百正确率
// @author              Prowl
// @match               https://exam.yooc.me/group/*/exam/*/take
// @match               https://www.yooc.me/group/*/exam/*/detail
// @run-at              document-end
// @require             https://cdn.staticfile.org/limonte-sweetalert2/11.0.1/sweetalert2.all.min.js
// @require             https://cdn.bootcss.com/crypto-js/3.1.9-1/crypto-js.min.js
// @original-script     https://scriptcat.org/script-show-page/958/
// ==/UserScript==



//是否自动下一题  1 开启  2 关闭  0 询问
var autoNext = 0

Swal = Swal || window.Swal


if (origin == 'https://www.yooc.me') {
    location.href = "https://exam.yooc.me" + location.pathname.slice(0, -6) + 'take'
}

if (autoNext == 0) {
  Swal.fire({
    title: "答题模式",
    text: "是否开启自动答题？",
    icon: "warning",
    showCancelButton: true,
    confirmButtonColor: "#DD6B55",
    confirmButtonText: "确定",
    cancelButtonText: "取消"
  }).then((result) => {
    autoNext = result.isConfirmed ? 1 : 2;
    checkForH3();
  });
} else {
  checkForH3();
}


function wait() {
  start()
  var buttons = document.querySelectorAll('.size-n.round');
  buttons.forEach(function(button) {
    button.addEventListener('click', function(e) {
      setTimeout(function() {
        start();
      }, 300);
    });
  });
}


let flag = false;

function checkForH3() {
  try {
    let h3 = document.querySelector('h3 > div').innerHTML.replace(/[\r\n]/g, "");
    if (h3) {
      flag = true;
      wait();
      return;
    }
  } catch(e) {}
  if (!flag) {
    setTimeout(checkForH3, 1000);
  }
}

const Base64 = function () {
    var _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    this.encode = function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;
        input = _utf8_encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
                _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
                _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
        }
        return output;
    }

    this.decode = function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = _keyStr.indexOf(input.charAt(i++));
            enc2 = _keyStr.indexOf(input.charAt(i++));
            enc3 = _keyStr.indexOf(input.charAt(i++));
            enc4 = _keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = _utf8_decode(output);
        return output;
    }

    var _utf8_encode = function (string) {
        string = string.replace(/\r\n/g, "\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utfText += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }
        return utftext;
    }

    // private method for UTF-8 decoding  
    var _utf8_decode = function (utftext) {
        var string = "";
        var i = 0;
        var c = 0;
        var c1 = 0;
        var c2 = 0;
        while (i < utftext.length) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if ((c > 191) && (c < 224)) {
                c1 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6) | (c1 & 63));
                i += 2;
            } else {
                c1 = utftext.charCodeAt(i + 1);
                c2 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(((c & 15) << 12) | ((c1 & 63) << 6) | (c2 & 63));
                i += 3;
            }
        }
        return string;
    }
}


function getyibanid() {
  let value = "; " + document.cookie;
  let parts = value.split("; " + "yiban_id" + "=");
  if (parts.length === 2) {
    return parts.pop().split(";").shift();
  }
}

const CryptoDecrypt = (word,cbckey) => {
    const key = CryptoJS.enc.Utf8.parse(cbckey) ;
    const iv = CryptoJS.enc.Utf8.parse('42e07d2f7199c35d');
    const srcs = CryptoJS.enc.Base64.parse(word);
    const decrypt = CryptoJS.AES.decrypt({ ciphertext: srcs }, key, {
        iv: iv,
        mode: CryptoJS.mode.CBC,
        padding: CryptoJS.pad.Pkcs7
    });
    const decryptedStr = decrypt.toString(CryptoJS.enc.Utf8);
    return decryptedStr;
};



function start() {
    let key = ''
    for (var i = 0; i < localStorage.length; i++) {
        if (localStorage.key(i).indexOf("exam-paper-") != -1) {
            key = localStorage.key(i)
        }
    }
    let exam_paper = JSON.parse(localStorage.getItem(key)).value.paper
    const decode = (str) => {
        //let result = (decodeURI(new Base64().decode(str.split("").reverse().join(''))).split("yooc@admin")[0] || "")CryptoJS.enc.Utf8.parse(
        let cbckey = CryptoJS.MD5('yooc@admin'+getyibanid()).toString().substring(8, 24)
        result = CryptoDecrypt(str,cbckey)
        console.log('数据库解密中:\nKEY:'+cbckey+'\nIV:42e07d2f7199c35d\n原始数据:'+str+'\n返回数据:'+result)
        return (result)
    }

    const getanswer = (sectionName, title) => {
        for (let i in exam_paper) {
            if (sectionName == exam_paper[i].sectionName) {
                let subjects = exam_paper[i].subjects
                for (let i in subjects) {
                    if (title == subjects[i].title[0].replace(/[\r\n]/g, "")) {
                        let question = subjects[i]
                        let answer = decode(question.answer)
                        answer = JSON.parse('[' + String(answer) + ']')
                        answer = eval('[' + String(answer) + ']')
                        let all_answer = []
                        for (let i = 0; i < answer.length; i++) {
                            all_answer.push(question.option[answer[i]][0])
                        }
                        return (all_answer)
                    }
                }
            }
        }
    }

    const getinputanswer = (sectionName, title) => {
        for (let i in exam_paper) {
            if (sectionName == exam_paper[i].sectionName) {
                let subjects = exam_paper[i].subjects
                for (let i in subjects) {
                    let l_title = subjects[i].title[0].split('{input}').join('').replace(/\s*/g, "").replace(/<.*?>/ig, "").replace(/[\r\n]/g, "")
                    if (title == l_title) {
                        let question = subjects[i]
                        let answer = decode(question.answer)
                        answer = JSON.parse('[' + String(answer) + ']')[0]
                        return (answer)
                    }
                }
            }
        }
    }

    const select = (sectionName) => {
        let title = document.querySelector('h3 > div').innerHTML.replace(/[\r\n]/g, "")
        console.log('题目:'+title)
        let r_answer = getanswer(sectionName, title)
        console.log('答案:'+r_answer)
        Array.from(document.querySelectorAll('body>div>div>div>main>main>div>div>div>div>div>ul>li')).forEach((answer) => {
            try {
                for (let i = 0; i < r_answer.length; i++) {
                    let t_answer = answer.getElementsByClassName('flex-auto')[0]
                    if (r_answer[i] == t_answer.innerHTML.slice(2)) {
                        if (answer.className.slice(-2) != '_c') {
                            answer.click()
                            var event = document.createEvent('HTMLEvents');
                            event.initEvent("click", false, false);
                            answer.dispatchEvent(event)
                        }
                    }
                }
            } catch (err) {
                console.log(err.message)
                autoNext = 0
                Swal.fire({
                    title: "未能找到数据",
                    text: "是否刷新页面重新获取？",
                    type: "warning",
                    showCancelButton: true,
                    confirmButtonColor: "#DD6B55",
                    confirmButtonText: "确定",
                    cancelButtonText: "取消"
                }).then((isConfirm) => {
                    if (isConfirm.value) {
                        localStorage.clear()
                        location.reload()
                    } else {
                        return
                    }
                });
            }
        });
    }

    const input = (sectionName) => {
        let question = document.querySelector('h3 > div > div')
        let title = question.textContent.replace(/\s*/g, "").replace(/[\r\n]/g, "")
        console.log('题目:'+title)
        let r_answer = getinputanswer(sectionName, title)
        console.log('答案:'+r_answer)
        try {
            for (let i = 0; i < r_answer.length; i++) {
                if (Array.isArray(r_answer[i])) {
                    question.getElementsByTagName('input')[i].value = r_answer[i][0]
                } else {
                    question.getElementsByTagName('input')[i].value = r_answer[i]
                }
                var event = document.createEvent('HTMLEvents');
                event.initEvent("input", false, false);
                question.getElementsByTagName('input')[i].dispatchEvent(event)
            }
        } catch (err) {
            console.log(err.message)
            //Swal.fire('未能找到数据，正在重新获取')
            //localStorage.clear()
            //location.reload()
        }
    }


    const u = undefined
    let whetherinput = document.getElementsByClassName('exam-input')
    let sectionName = document.querySelector('h2').innerHTML
    if (sectionName == u) {
        sectionName = ""
    }
    if (whetherinput[0] == u) {
        select(sectionName)
    } else {
        input(sectionName)
    }


    //自动答题
    let timeoutId;
    function stopAutoNext() {
    clearTimeout(timeoutId);
    }

    function startAutoNext() {
    timeoutId = setTimeout(function () {
        document.getElementsByClassName('size-n round')[1].click();
    }, 1000);
    }

    if (autoNext == 1) {
    startAutoNext();
    } else {
    stopAutoNext();
    }
};