// ==UserScript==
// @name         易班考试
// @namespace    http://tampermonkey.net/
// @license Common
// @version      1.1.8
// @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，不会收费，也不会发广告，请看下方的详细说明。
// @author       木木
// @match        https://exam.yooc.me/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=yooc.me
// @grant        none
// @run-at       document-start
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';

    function my_replace(text) {
        text = text.replace(new RegExp(/( |	|[\r\n])|\s+|\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);
    }

    let token = get_value("token");
    localStorage.clear();
    if (token !== undefined) set_value("token", token); else get_token();

    function get_token() {
        let t = prompt("请输入token(加2995653687发token五个字母获取)", token === undefined ? '' : token);
        if (t.length !== 16) {
            alert("长度不对");
            get_token();
        } else {
            token = t;
            set_value("token", token);
        }
    }


    // let local_str = get_value("tk");
    // if (typeof (local_str) !== "undefined") {
    //         tk = JSON.parse(local_str);
    //     } else {
    //         tk = JSON.parse("{}");
    //     }
    let tk;
    let id;
    // let examuser_id;
    let hook_fetch = window.fetch;
    window.fetch = async function (...args) {
        if (args[0].indexOf("paper") !== -1) {
            id = args[0].slice(args[0].indexOf("yibanId=") + 8)
            // examuser_id = args[0].slice(args[0].indexOf("examuserId=") + 11, args[0].indexOf("&"));
            return await hook_fetch(...args).then((oriRes) => {
                let hookRes = oriRes.clone()
                hookRes.text().then(res => {
                    /*res = my_replace(res);
                    let js = JSON.parse(res);
                    // decode_res(js);
                    js["id"] = id;
                    js["token"] = token;
                    get_answer(js);*/
                })
                return oriRes
            })
        }
        return hook_fetch(...args)
    }

    /*function get_answer(res) {
        const httpRequest = new XMLHttpRequest();
        httpRequest.open('POST', 'http://127.0.0.1:8000/', true);
        httpRequest.setRequestHeader("Content-type", "application/json");
        httpRequest.send(JSON.stringify(res));
        httpRequest.onreadystatechange = function () {
            if (httpRequest.readyState === 4 && httpRequest.status === 200) {
                tk = JSON.parse(httpRequest.responseText);
                console.log(tk);
            }
        };
    }*/

    /*function reverseString(str) {
        if (str === '') return ''; else return reverseString(str.substr(1)) + str.charAt(0);
    }*/

    /*function decode_res(res) {
        for (let i = 0; i < res['data'].length; i++) {
            for (let j = 0; j < res['data'][i]['subjects'].length; j++) {
                let one = res['data'][i]['subjects'][j];
                let an_str = decode(one["answer"])
                let an_list = []
                let ans = an_str.match(/\d/g);
                for (let k = 0; k < ans.length; k++) {
                    an_list.push(my_replace(one['option'][parseInt(ans[k])][0]));
                }
                tk[my_replace(one['title'][0])] = an_list;
            }
        }
    }*/

    function add_button() {
        if (!document.getElementsByTagName("ul").length > 0) {
            setTimeout(function () {
                add_button();
            }, 1000);
            return;
        }
        let ul = document.getElementsByTagName("ul");
        let bottom = ul[1];
        let last = bottom.getElementsByTagName("li")[0].children[0];
        let next = bottom.getElementsByTagName("li")[3].children[0];
        let jiaojuan_p = document.getElementsByClassName("pr-s")[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 (has_done) {
                alert("你已经点过了，如果没反应请稍后，或者刷新页面,重复点击会导致多选题出现错误。");
                return
            }
            has_done = true;
            let res;
            for (let i = 0; i < localStorage.length; i++) {
                if (localStorage.key(i).startsWith("exam-paper")) {
                    res = JSON.parse(my_replace(localStorage.getItem(localStorage.key(i))));
                    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");
            } else {
                res['token'] = token;
                res['id'] = id;
                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);
                        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，请明天再试，或者输入新的token');
                                get_token();
                            } else {
                                alert(result['msg']);
                            }
                            return;
                        }
                        tk = result['result'];
                        // console.log(result);
                        let span = bottom.getElementsByTagName("span");
                        let count_text = span[0].innerText;
                        let count_list = count_text.split("/");
                        for (let i = 0; i < count_list[0]; i++) {
                            last.click();
                        }

                        if (parseInt(count_list[1]) === result['answers'].length) {
                            for (let i = 0; i < count_list[1]; i++) {
                                let body = h3.parentElement.children[1].children[0];
                                let ans_l = body.getElementsByTagName("li");
                                for (let j = 0; j < ans_l.length; j++) {
                                    let an_str = my_replace(ans_l[j].children[1].innerText.slice(2));
                                    // console.log(an_str);
                                    if (result['answers'][i].indexOf(an_str) !== -1) {
                                        ans_l[j].click();
                                    }
                                }
                                next.click();
                            }
                        } else {
                            for (let i = 0; i < parseInt(count_list[1]) - parseInt(count_list[0]) + 1; i++) {
                                let title = my_replace(h3.getElementsByTagName("div")[0].innerText);
                                let ans = tk[title];
                                let body = h3.parentElement.children[1].children[0];
                                let ans_l = body.getElementsByTagName("li");
                                if (typeof (ans) !== "undefined") {
                                    for (let j = 0; j < ans_l.length; j++) {
                                        let an_str = my_replace(ans_l[j].children[1].innerText.slice(2));
                                        if (ans.indexOf(an_str) !== -1) {
                                            ans_l[j].click();
                                        }
                                    }
                                }
                                next.click();
                            }
                        }


                    }
                }
            }


        };
        jiaojuan_p.appendChild(bt);
    }

    window.onload = function () {
        console.log(window.location.href);
        if (window.location.href.endsWith('exams')) {
            const httpRequest = new XMLHttpRequest();
            httpRequest.open('GET', 'https://124.222.110.105:5721/times/' + token, true);
            httpRequest.send();
            httpRequest.onreadystatechange = function () {
                if (httpRequest.readyState === 4 && httpRequest.status === 200) {
                    const times_json = JSON.parse(httpRequest.responseText);
                    if (!times_json['ok']) {
                        alert('未输入token或者token不存在，你可以在稍后的界面输入（请先确保你有token）');
                    } else if (times_json['times'] <= 0) {
                        alert('token使用次数已用尽（你可以继续自己考试）');
                    } else {
                        alert('服务器连接成功，剩余次数' + times_json['times']);
                    }
                } else if(httpRequest.readyState === 4) {
                    alert('查询剩余次数失败，可能是服务器G了，可能脚本不会正常工作');
                }
            }
        }
        if (window.location.href.endsWith('take')) add_button();
    }
})();