// ==UserScript==
// @name         强国学习
// @namespace    ttglad
// @version      1.0.4
// @description  问题反馈位置： https://github.com/ttglad/learning/issues 。 强国学习自动答题，目前实现 每日答题，每周答题，专项答题(操作方法更新为：打开答题页面后，手动刷新下自动开启)
// @license MIT
// @author       ttglad
// @match        https://www.xuexi.cn
// @match        https://www.xuexi.cn/*
// @match        https://pc.xuexi.cn/points/exam-practice.html*
// @match        https://pc.xuexi.cn/points/exam-weekly-detail.html*
// @match        https://pc.xuexi.cn/points/exam-paper-detail.html*
// @match        https://pc.xuexi.cn/points/my-study.html*
// @match        https://pc.xuexi.cn/points/exam-index.html*
// @grant        none
// @downloadURL https://update.greasyfork.icu/scripts/436835/%E5%BC%BA%E5%9B%BD%E5%AD%A6%E4%B9%A0.user.js
// @updateURL https://update.greasyfork.icu/scripts/436835/%E5%BC%BA%E5%9B%BD%E5%AD%A6%E4%B9%A0.meta.js
// ==/UserScript==
window.onload = function () {

    var WaitingTime = 10, setTimeoutFunc = null, ManageType = 'auto', isManual = false;

    function getAnswers() {
        var answerChoseNum = 0, answerArray = [], match_num = {}, max = 0, timeAfter = 0;
        isManual = false;
        if (document.querySelector(".q-header") == null) {
            if (document.querySelector(".ant-btn.action.ant-btn-primary") != null) {
                chrome.runtime.sendMessage({"method": "askComplete"});
                return;
            } else {
                setTimeoutFunc = setTimeout(getAnswers, parseInt(Math.random() * 1000 + 1000));
                return;
            }
        }
        var questionTitle = document.querySelector(".q-header");
        if (questionTitle == null) {
            return;
        }
        var questionType = questionTitle.innerText.substr(0, 3);
        if (document.querySelector(".q-footer .tips") != null) {
            document.querySelector(".q-footer .tips").click();
        } else {
            answerSubmit(1);
            return;
        }
        document.querySelectorAll('.line-feed [color=red]').forEach(function (a, b, c) {
            let i = a.innerText;
            if (i != "") answerArray.push(i);
        });

        // 如果 答案为空，则找到全部提示内容
        if (answerArray.length == 0) {
            document.querySelectorAll('.line-feed > font').forEach(function (a, b, c) {
                let i = a.innerText;
                if (i != "") answerArray.push(i);
            });

            if (answerArray.length == 0) {
                document.querySelectorAll('.line-feed').forEach(function (a, b, c) {
                    let i = a.innerText;
                    if (i != "") answerArray.push(i);
                });
            }
        }
        switch (questionType) {
            case "单选题":
                timeAfter = 1;
            case "多选题":
                answerChoseNum = document.querySelectorAll('.q-answers .chosen').length;
                if (answerChoseNum <= 0) {
                    document.querySelectorAll('.q-answer').forEach(function (a, b, c) {
                        var answerSelect = a.innerHTML.split('. ').slice(-1)[0];
                        var answerIsRight = false;
                        var answerMatches = 0;
                        var isChosen = false;
                        var answerJoinString = answerArray.join('');

                        // 转换符号，
                        answerSelect = answerSelect.replace(/\(/g, "（").replace(/\)/g, "）");
                        answerJoinString = answerJoinString.replace(/\(/g, "（").replace(/\)/g, "）");

                        isChosen = Boolean(a.className.indexOf("chosen") != -1);
                        answerIsRight = (answerSelect.indexOf(answerJoinString) != -1 || answerJoinString.indexOf(answerSelect) != -1) && answerJoinString != "";
                        if (answerIsRight && questionType == '单选题') {
                            answerIsRight = (answerJoinString.length == answerSelect.length ? true : false);
                        }
                        if (answerIsRight && !isChosen) {
                            a.click();
                            answerChoseNum++;
                        }
                        if (!answerIsRight) {
                            answerMatches += getAnswerMatches(answerJoinString, a.innerHTML);
                            match_num[answerMatches] = a
                        }
                    })
                    if (answerChoseNum == 0) {
                        for (let i in match_num) {
                            max = Number(max) >= Number(i) ? Number(max) : Number(i);
                        }
                        match_num[max].click();
                        answerChoseNum++;
                        isManual = true;
                    }
                    manualManage();
                    timeAfter = timeAfter == 0 ? 2500 : 1500;
                }
                break;
            case "填空题":
                var inpus = document.querySelectorAll('.q-body input');
                var inputs_e = document.querySelectorAll('.q-body input[value=""]');
                answerChoseNum = inpus.length - inputs_e.length;
                if (inputs_e.length > 0) {
                    var ev = new Event('input', {bubbles: true});
                    inpus.forEach(function (a, b, c) {
                        if (answerArray[0] == undefined) {
                            isManual = true;
                            let a = document.querySelector(".q-body").innerText;
                            let n = parseInt(Math.random() * 2 + 2);
                            let i = parseInt(Math.random() * (a.length - n - 1));
                            answerArray[0] = a.substr(i, n);
                        }
                        var value = "";
                        if (c.length == 1)
                            value = answerArray.join('');
                        else
                            value = b < answerArray.length ? answerArray[b] : answerArray[0];
                        if (a.value == "") {
                            a.setAttribute("value", value);
                            a.dispatchEvent(ev);
                            answerChoseNum++;
                        }
                    })
                    manualManage();
                    timeAfter = 3500;
                }
                break;
        }
        setTimeoutFunc = setTimeout(function () {
            answerSubmit(answerChoseNum)
        }, parseInt(Math.random() * 1500 + timeAfter));
    }

    function answerSubmit(answerChoseNum = 0) {
        if (answerChoseNum > 0 && ManageType == 'auto') {
            !document.querySelector(".next-btn").disabled ? document.querySelector(".next-btn").click() : document.querySelector(".submit-btn").click();
            setTimeoutFunc = setTimeout(getAnswers, parseInt(Math.random() * 1000 + 2000));
        }
    }

    function getAnswerMatches(a = '', b = '') {
        let c = 0;
        for (let i = 0; i < b.length; i++) {
            if (a.indexOf(b.substr(i, 1)) != -1) {
                c++;
            }
        }
        return c;
    }

    function manualManage() {
        if (document.querySelector("#my_ms") != null || !isManual) return;
        let ds_c = 0;
        let ds_t = null;
        ManageType = "wait";
        let e = document.createElement("div");
        e.id = "my_ms";
        e.innerHTML = "此题无完全匹配答案，已填写(选择)一个相对最匹配的答案(可能是错误的)。你可以点击下面按钮切换到手动做题并修正答案后再次点击按钮切换到自动做题。<br><span id='my_ds'>若 <span id='my_ds_c'>" + WaitingTime + "</span> 秒无操作则继续自动做题</span><br>";
        e.style.color = 'red';
        e.style.fontSize = '20px';
        e.style.textAlign = 'center';
        document.querySelector(".header-row").appendChild(e);
        let b = document.createElement("button");
        b.style.color = 'green';
        b.style.fontSize = '24px';
        b.style.textAlign = 'center';
        b.style.marginTop = '10px';
        b.value = 'auto';
        b.innerText = '切换到手动做题';
        b.onclick = function () {
            document.querySelector("#my_ds").innerHTML = '';
            if (ds_t != null) {
                clearInterval(ds_t);
                ds_t = null;
            }
            if (this.value == 'auto') {
                this.value = 'manual';
                ManageType = "manual";
                b.innerText = '切换到自动做题';
                this.style.color = 'red';
            } else {
                this.value = 'auto';
                ManageType = 'auto';
                b.innerText = '切换到手动做题';
                this.style.color = 'green';
                document.querySelector("#my_ms").remove();
                getAnswers();
            }
        }
        e.appendChild(b);
        ds_t = setInterval(function () {
            ds_c++;
            document.querySelector("#my_ds_c").innerText = WaitingTime - ds_c;
            if (ds_c >= WaitingTime) {
                document.querySelector("#my_ms").remove();
                clearInterval(ds_t);
                ds_t = null;
                ManageType = 'auto';
                answerSubmit(1);
            }
        }, 1000);

    }

    setTimeoutFunc = setTimeout(getAnswers, parseInt(Math.random() * 1000 + 2000));

}