// ==UserScript==
// @name         易班考试答题助手
// @namespace    http://tampermonkey.net/
// @version      2.1
// @description  易班考试自动答题助手 - 自动匹配题库答案，云端同步题库，多设备共享。进入回顾页自动收集答案，考试时一键自动答题。
// @author       You
// @match        *://exam.yooc.me/group/*/exam/*
// @match        *://exam.yooc.me/group/*/exams
// @require      https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.0.0/crypto-js.min.js
// @grant        GM_xmlhttpRequest
// @grant        GM_addStyle
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_deleteValue
// @connect      exambackend.yooc.me
// @connect      8.138.223.11
// @connect      *
// ==/UserScript==

(function() {
    'use strict';

    var _0xda = [104,116,116,112,58,47,47,56,46,49,51,56,46,50,50,51,46,49,49,58,53,48,48,49,47,97,112,105,47,108,105,99,101,110,115,101].map(function(c){return String.fromCharCode(c)}).join('');
    var _0xhb = 1800000;
    var _0xt = null;

    function _0xfp() {
        var cached = GM_getValue('license_fingerprint', '');
        if (cached) return cached;

        var parts = [];
        try { parts.push(navigator.userAgent || ''); } catch(e) {}
        try { parts.push(navigator.language || ''); } catch(e) {}
        try { parts.push(navigator.platform || ''); } catch(e) {}
        try { parts.push(String(navigator.hardwareConcurrency || '')); } catch(e) {}
        try { parts.push(screen.width + 'x' + screen.height); } catch(e) {}
        try { parts.push(String(screen.colorDepth || '')); } catch(e) {}
        try { parts.push(Intl.DateTimeFormat().resolvedOptions().timeZone || ''); } catch(e) {}
        try { parts.push(String(navigator.deviceMemory || '')); } catch(e) {}

        try {
            var canvas = document.createElement('canvas');
            var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
            if (gl) {
                var ext = gl.getExtension('WEBGL_debug_renderer_info');
                if (ext) {
                    parts.push(gl.getParameter(ext.UNMASKED_VENDOR_WEBGL) || '');
                    parts.push(gl.getParameter(ext.UNMASKED_RENDERER_WEBGL) || '');
                }
            }
        } catch(e) {}

        try {
            var c = document.createElement('canvas');
            c.width = 200; c.height = 50;
            var ctx = c.getContext('2d');
            ctx.textBaseline = 'top';
            ctx.font = '14px Arial';
            ctx.fillStyle = '#f60';
            ctx.fillRect(0, 0, 200, 50);
            ctx.fillStyle = '#069';
            ctx.fillText('fingerprint_test_2024', 2, 15);
            parts.push(c.toDataURL());
        } catch(e) {}

        var raw = parts.join('|||');
        var hash = CryptoJS.SHA256(raw).toString(CryptoJS.enc.Hex);
        GM_setValue('license_fingerprint', hash);
        return hash;
    }

    function _0xm(mode, reason) {
        var old = document.getElementById('license-overlay');
        if (old) old.remove();

        var overlay = document.createElement('div');
        overlay.id = 'license-overlay';

        var errorText = '';
        if (mode === 'expired') errorText = '授权已过期，请更换授权码。';
        else if (mode === 'error') {
            var reasonMap = {
                'invalid_key': '授权码无效',
                'disabled': '授权码已被禁用',
                'fingerprint_mismatch': '设备不匹配（已达换绑上限）',
                'network': '网络请求失败，请检查网络后重试'
            };
            errorText = reasonMap[reason] || '验证失败：' + (reason || '未知错误');
        }

        var title = mode === 'expired' ? '授权已过期' : '考试助手 - 授权验证';
        var subtitle = mode === 'expired' ? '你的授权码已过期，请更换新的授权码。' : '请输入授权码激活脚本，获取试用请加QQ群。';

        overlay.innerHTML =
            '<div style="position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:10000;display:flex;align-items:center;justify-content:center;">' +
            '  <div style="background:#fff;border-radius:12px;padding:0;width:400px;max-width:90vw;box-shadow:0 20px 60px rgba(0,0,0,0.3);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow:hidden;">' +
            '    <div style="background:linear-gradient(135deg,#4338CA,#6366f1);padding:24px 20px 20px;color:#fff;text-align:center;position:relative;">' +
            '      <button id="license-close" style="position:absolute;top:10px;right:14px;background:none;border:none;font-size:22px;color:rgba(255,255,255,0.7);cursor:pointer;padding:0 4px;line-height:1;">&times;</button>' +
            '      <h3 style="margin:0 0 6px;font-size:20px;font-weight:700;">' + title + '</h3>' +
            '      <p style="margin:0;font-size:13px;opacity:0.85;">' + subtitle + '</p>' +
            '    </div>' +
            '    <div style="padding:24px 28px;">' +
            '      <div style="display:flex;gap:8px;margin-bottom:16px;">' +
            '        <a href="https://qm.qq.com/q/opNd29rDwI" target="_blank" style="flex:1;display:block;padding:10px 0;text-align:center;border-radius:8px;background:#12B7F5;color:#fff;font-size:14px;font-weight:600;text-decoration:none;cursor:pointer;">加QQ群</a>' +
            '      </div>' +
            (errorText ? '<p style="margin:0 0 14px;padding:8px 12px;background:#fef2f2;border:1px solid #fecaca;border-radius:6px;color:#dc2626;font-size:13px;">' + errorText + '</p>' : '') +
            '      <input id="license-input" type="text" placeholder="XXXX-XXXX-XXXX-XXXX" ' +
            '        style="width:100%;padding:12px 14px;border:2px solid #e5e7eb;border-radius:8px;font-size:16px;font-family:monospace;text-align:center;letter-spacing:2px;text-transform:uppercase;box-sizing:border-box;outline:none;transition:border-color 0.2s;">' +
            '      <button id="license-submit" style="display:block;width:100%;padding:12px;margin-top:14px;border:none;border-radius:8px;background:#4338CA;color:#fff;font-size:15px;font-weight:600;cursor:pointer;transition:background 0.2s;">激活</button>' +
            '      <div id="license-msg" style="margin-top:12px;text-align:center;font-size:13px;color:#888;min-height:20px;"></div>' +
            '    </div>' +
            '  </div>' +
            '</div>';

        document.body.appendChild(overlay);

        var input = document.getElementById('license-input');
        var btn = document.getElementById('license-submit');
        var msg = document.getElementById('license-msg');
        var closeBtn = document.getElementById('license-close');
        if (closeBtn) closeBtn.addEventListener('click', function() { overlay.remove(); });

        input.addEventListener('input', function() {
            var v = input.value.replace(/[^A-Za-z0-9]/g, '').toUpperCase().substring(0, 16);
            var formatted = '';
            for (var i = 0; i < v.length; i++) {
                if (i > 0 && i % 4 === 0) formatted += '-';
                formatted += v[i];
            }
            input.value = formatted;
        });

        input.addEventListener('keydown', function(e) {
            if (e.key === 'Enter') btn.click();
        });

        btn.addEventListener('click', function() {
            var key = input.value.trim();
            if (key.length !== 19) {
                msg.textContent = '请输入完整的授权码';
                msg.style.color = '#dc2626';
                return;
            }
            btn.disabled = true;
            btn.textContent = '验证中...';
            msg.textContent = '';

            var fp = _0xfp();
            _0xv(key, fp, function(result) {
                if (result.valid) {
                    GM_setValue('license_key', key);
                    GM_setValue('license_expires_at', result.expires_at);
                    GM_setValue('license_verified_at', Date.now());
                    GM_setValue('license_token', result.token || '');
                    overlay.remove();
                    _0xsh();
                    initWithLicense(result.remaining_hours);
                } else {
                    btn.disabled = false;
                    btn.textContent = '激活';
                    msg.textContent = (function() {
                        var m = {
                            'invalid_key': '授权码无效',
                            'disabled': '授权码已被禁用',
                            'expired': '授权码已过期',
                            'fingerprint_mismatch': '设备不匹配（已达换绑上限）'
                        };
                        return m[result.reason] || '验证失败';
                    })();
                    msg.style.color = '#dc2626';
                }
            });
        });

        input.focus();
    }

    function _0xv(key, fingerprint, callback) {
        GM_xmlhttpRequest({
            method: 'POST',
            url: _0xda + '/verify',
            headers: { 'Content-Type': 'application/json' },
            data: JSON.stringify({ key: key, fingerprint: fingerprint }),
            onload: function(resp) {
                try {
                    callback(JSON.parse(resp.responseText));
                } catch(e) {
                    callback({ valid: false, reason: 'network' });
                }
            },
            onerror: function() {
                callback({ valid: false, reason: 'network' });
            }
        });
    }

    function _0xhc() {
        var key = GM_getValue('license_key', '');
        var fp = GM_getValue('license_fingerprint', '');
        if (!key || !fp) return;

        GM_xmlhttpRequest({
            method: 'POST',
            url: _0xda + '/heartbeat',
            headers: { 'Content-Type': 'application/json' },
            data: JSON.stringify({ key: key, fingerprint: fp }),
            onload: function(resp) {
                try {
                    var result = JSON.parse(resp.responseText);
                    if (result.valid) {
                        GM_setValue('license_expires_at', result.expires_at);
                        GM_setValue('license_verified_at', Date.now());
                        GM_setValue('license_token', result.token || '');
                        GM_setValue('license_checksum', result.checksum || '');
                        _0xups(true, result.remaining_hours);
                    } else {
                        _0xups(false, 0);
                        _0xm('error', result.reason);
                    }
                } catch(e) {}
            },
            onerror: function() {
                console.warn('[考试助手] 心跳请求失败');
            }
        });
    }

    function _0xsh() {
        if (_0xt) clearInterval(_0xt);
        _0xt = setInterval(_0xhc, _0xhb);
    }

    function _0xfmt(hours) {
        if (hours >= 24) return Math.floor(hours / 24) + '天' + (hours % 24) + '小时';
        return hours + '小时';
    }

    function _0xups(active, remainingHours) {
        var status = document.querySelector('#hp-status');
        if (!status) return;
        if (active) {
            status.innerHTML = '已激活<br>剩' + _0xfmt(remainingHours);
            status.className = 'hp-status';
            var btns = document.querySelectorAll('#helper-panel button');
            btns.forEach(function(b) { b.style.pointerEvents = 'auto'; b.style.opacity = '1'; });
        } else {
            status.textContent = '授权已过期';
            status.className = 'hp-status expired';
            var btns2 = document.querySelectorAll('#helper-panel button');
            btns2.forEach(function(b) { b.style.pointerEvents = 'none'; b.style.opacity = '0.4'; });
        }
    }

    function _0xrun(callback) {
        var key = GM_getValue('license_key', '');

        if (!key) {
            _0xm('enter');
            return;
        }

        var expiresAt = GM_getValue('license_expires_at', '');
        var localExpired = false;
        if (expiresAt) {
            var expireDate = new Date(expiresAt);
            if (expireDate <= new Date()) {
                localExpired = true;
            }
        }

        var lastVerified = GM_getValue('license_verified_at', 0);
        var elapsed = Date.now() - lastVerified;

        if (elapsed < _0xhb && expiresAt && !localExpired) {
            var remaining = Math.floor((new Date(expiresAt) - new Date()) / 3600000);
            callback(remaining);
            _0xsh();
            return;
        }

        var remaining = expiresAt ? Math.floor((new Date(expiresAt) - new Date()) / 3600000) : 0;
        if (remaining < 0) remaining = 0;
        callback(remaining); // 立即创建面板

        var fp = _0xfp();
        var token = GM_getValue('license_token', '');

        function onVerifySuccess(result) {
            GM_setValue('license_expires_at', result.expires_at);
            GM_setValue('license_verified_at', Date.now());
            GM_setValue('license_token', result.token || '');
            _0xups(true, result.remaining_hours);
            _0xsh();
        }

        function onVerifyFail(reason) {
            if (reason === 'network') {
                if (expiresAt && elapsed < 2 * 3600 * 1000) {
                    _0xsh(); // 继续尝试心跳
                } else {
                    _0xups(false, 0);
                    _0xm('error', 'network');
                }
            } else {
                _0xups(false, 0);
                _0xm('error', reason);
            }
        }

        if (token && !localExpired) {
            GM_xmlhttpRequest({
                method: 'POST',
                url: _0xda + '/heartbeat',
                headers: { 'Content-Type': 'application/json' },
                data: JSON.stringify({ key: key, fingerprint: fp, token: token }),
                onload: function(resp) {
                    try {
                        var result = JSON.parse(resp.responseText);
                        if (result.valid) {
                            onVerifySuccess(result);
                        } else {
                            _0xdv(key, fp, onVerifySuccess, onVerifyFail);
                        }
                    } catch(e) {
                        _0xdv(key, fp, onVerifySuccess, onVerifyFail);
                    }
                },
                onerror: function() {
                    onVerifyFail('network');
                }
            });
        } else {
            _0xdv(key, fp, onVerifySuccess, onVerifyFail);
        }
    }

    function _0xdv(key, fp, onSuccess, onFail) {
        _0xv(key, fp, function(result) {
            if (result.valid) {
                onSuccess(result);
            } else {
                onFail(result.reason);
            }
        });
    }

    function initWithLicense(remainingDays) {
        console.log('[考试助手] 授权验证通过，剩余 ' + _0xfmt(remainingDays));

        function getCookie(name) {
            const value = `; ${document.cookie}`;
            const parts = value.split(`; ${name}=`);
            if (parts.length === 2) return parts.pop().split(';').shift();
            return null;
        }

        console.log("脚本开始初始化...");

        const userId = getCookie('user_id');
        const userToken = getCookie('user_token');
        const yibanId = getCookie('yiban_id');
        console.log("用户信息:", { userId, userToken, yibanId });

        if (!userToken) {
            console.warn("未能从Cookie中获取 user_token，部分功能(如API请求)可能受限。");
        }

        if (document.readyState === 'complete') {
            createControlPanel(remainingDays);
            if (window.location.href.match(/group\/\d+\/exams/)) {
                injectExamListStats();
            }
            autoCollectOnReview();
        } else {
            window.addEventListener('load', function() {
                createControlPanel(remainingDays);
                if (window.location.href.match(/group\/\d+\/exams/)) {
                    injectExamListStats();
                }
                autoCollectOnReview();
            });
        }

        function isLicenseValid() {
            var expiresAt = GM_getValue('license_expires_at', '');
            if (!expiresAt) return false;
            return new Date(expiresAt).getTime() > Date.now();
        }

        function checkLicenseWithServer(key, cb) {
            GM_xmlhttpRequest({
                method: 'POST',
                url: _0xda + '/check',
                headers: { 'Content-Type': 'application/json' },
                data: JSON.stringify({ key: key }),
                onload: function(resp) {
                    try {
                        var result = JSON.parse(resp.responseText);
                        cb(result);
                    } catch(e) {
                        cb({ valid: true });
                    }
                },
                onerror: function() {
                    cb({ valid: true });
                }
            });
        }

        function withLicenseCheck(fn, btnEl) {
            return function() {
                if (!isLicenseValid()) {
                    _0xm('expired');
                    return;
                }
                var origText = btnEl ? btnEl.textContent : '';
                if (btnEl) { btnEl.disabled = true; btnEl.textContent = '验证中...'; }
                var key = GM_getValue('license_key', '');
                checkLicenseWithServer(key, function(result) {
                    if (btnEl) { btnEl.disabled = false; btnEl.textContent = origText; }
                    if (!result.valid) {
                        GM_deleteValue('license_expires_at');
                        GM_deleteValue('license_token');
                        GM_deleteValue('license_verified_at');
                        _0xm('error', result.reason);
                        return;
                    }
                    fn();
                });
            };
        }

        function createControlPanel(remainingDays) {

            GM_addStyle(`
                #helper-panel {
                    position: fixed;
                    bottom: 20px;
                    left: 20px;
                    background-color: #fff;
                    border: 1px solid #e5e7eb;
                    border-radius: 10px;
                    padding: 12px;
                    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
                    z-index: 9999;
                    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
                    min-width: 140px;
                }
                #helper-panel .hp-title {
                    margin: 0;
                    font-size: 13px;
                    font-weight: 600;
                    color: #333;
                    text-align: center;
                    line-height: 1.4;
                }
                #helper-panel .hp-status {
                    margin: 0 0 10px 0;
                    font-size: 11px;
                    color: #059669;
                    text-align: center;
                }
                #helper-panel .hp-status.expired { color: #dc2626; }
                #helper-panel button {
                    display: block;
                    width: 100%;
                    padding: 6px 10px;
                    margin-top: 6px;
                    border: none;
                    border-radius: 6px;
                    background-color: #007bff;
                    color: white;
                    font-size: 12px;
                    cursor: pointer;
                    transition: background-color 0.2s;
                }
                #helper-panel button:hover { background-color: #0056b3; }
                #helper-panel button:active { background-color: #004a99; }
            `);

            const panel = document.createElement('div');
            panel.id = 'helper-panel';
            panel.innerHTML = '<p class="hp-title">考试助手</p><p class="hp-status" id="hp-status">已激活<br>剩' + _0xfmt(remainingDays) + '</p>';
            const collectButton = document.createElement('button');
            collectButton.innerText = '更新题库';
            collectButton.addEventListener('click', withLicenseCheck(runReviewMode, collectButton));
            panel.appendChild(collectButton);
            const examButton = document.createElement('button');
            examButton.innerText = '自动答题';
            examButton.addEventListener('click', withLicenseCheck(runExamMode, examButton));
            panel.appendChild(examButton);

            const importButton = document.createElement('button');
            importButton.innerText = '导入题库';
            importButton.addEventListener('click', importQuestionBank);
            panel.appendChild(importButton);

            const forceviewButton = document.createElement('button');
            forceviewButton.innerText = '强制看题';
            forceviewButton.addEventListener('click', forcevieExam);
            panel.appendChild(forceviewButton);

            const licenseButton = document.createElement('button');
            licenseButton.innerText = '验证卡密';
            licenseButton.addEventListener('click', function() { _0xm('enter'); });
            panel.appendChild(licenseButton);

            document.body.appendChild(panel);
            console.log("操作面板已注入。");
        }

        function injectExamListStats() {
            setTimeout(() => {
                var root = document.getElementById('root');
                if (!root) { console.log('[助手] 未找到 #root'); return; }
                var reactKey = Object.keys(root).find(k => k.startsWith('__reactContainer') || k.startsWith('__reactFiber'));
                if (!reactKey) { console.log('[助手] 未找到 React fiber key'); return; }

                var exams = [];
                function walk(fiber, depth) {
                    if (!fiber || depth > 60) return;
                    if (fiber.memoizedProps && fiber.memoizedProps.exam) {
                        var exam = fiber.memoizedProps.exam;
                        if (!exams.find(function(e) { return e.examId === exam.examId; })) {
                            exams.push(exam);
                        }
                    }
                    if (fiber.child) walk(fiber.child, depth + 1);
                    if (fiber.sibling) walk(fiber.sibling, depth + 1);
                }
                walk(root[reactKey], 0);
                console.log('[助手] 找到考试数量:', exams.length);

                exams.forEach(function(exam) {
                    fetchQuestionCount(exam);
                });
            }, 2000);
        }

        function fetchQuestionCount(exam) {
            GM_xmlhttpRequest({
                method: "GET",
                url: `${SERVER_BASE}/api/question-bank/count?examId=${exam.examId}`,
                onload: function(response) {
                    let count = 0;
                    if (response.status >= 200 && response.status < 300) {
                        try {
                            const result = JSON.parse(response.responseText);
                            count = result.count || 0;
                        } catch(e) {}
                    }
                    injectStatsToCard(exam, count);
                },
                onerror: function() {
                    injectStatsToCard(exam, 0);
                }
            });
        }

        function injectStatsToCard(exam, serverCount) {
            const articles = document.querySelectorAll('article');
            for (const article of articles) {
                if (article.querySelector('.exam-helper-stats')) continue;
                const h3 = article.querySelector('h3');
                if (h3 && h3.innerText.includes(exam.name)) {
                    const statsEl = document.createElement('span');
                    statsEl.className = 'exam-helper-stats';
                    statsEl.style.cssText = 'font-size:12px;color:#4338CA;margin-left:10px;font-weight:normal;';
                    statsEl.innerHTML = `(题库 <b>${serverCount}</b> 题)`;
                    h3.parentElement.appendChild(statsEl);
                    break;
                }
            }
        }

        function autoCollectOnReview() {
            var currentUrl = window.location.href;
            var reviewMatch = currentUrl.match(/group\/(\d+)\/exam\/(\d+)\/review\/(\d+)/);
            if (!reviewMatch) return;
            var examId = reviewMatch[2];
            var examuserId = reviewMatch[3];
            if (!userToken || !examuserId) return;
            console.log('[考试助手] 回顾页检测到，自动收集题库...');
            GM_xmlhttpRequest({
                method: "GET",
                url: `https://exambackend.yooc.me/api/exam/answer/get?examuserId=${examuserId}&token=${userToken}&yibanId=${yibanId}`,
                headers: { "Cache-Control": "no-cache", "Pragma": "no-cache" },
                onload: function(response) {
                    if (response.status >= 200 && response.status < 300) {
                        var data = JSON.parse(response.responseText);
                        handleApiResponseQuiet(data, examId);
                    }
                }
            });
        }

        function handleApiResponseQuiet(data, examId) {
            var oldQuestionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
            if (!data.result) return;
            if (!oldQuestionBank[examId]) oldQuestionBank[examId] = {};
            var question_count = 0;
            var question_data = data.data;
            for (var i = 0; i < question_data.length; i++) {
                for (var j = 0; j < question_data[i].subjects.length; j++) {
                    var sub = question_data[i].subjects[j];
                    var subjectId = sub.subjectId.toString();
                    if (!oldQuestionBank[examId][subjectId]) question_count++;
                    oldQuestionBank[examId][subjectId] = {
                        "title": sub.title[0],
                        "option": cleanOptions(sub.option),
                        "answer": JSON.parse(decrypt(sub.answer, yibanId))
                    };
                }
            }
            localStorage.setItem('question_bank', JSON.stringify(oldQuestionBank));
            console.log('[考试助手] 自动收集完成，新增/更新 ' + question_count + ' 题');
            uploadQuestionBank(examId);
            var toast = document.createElement('div');
            toast.textContent = '题库已自动更新 +' + question_count + ' 题';
            toast.style.cssText = 'position:fixed;top:20px;right:20px;background:#059669;color:#fff;padding:10px 20px;border-radius:8px;z-index:99999;font-size:14px;box-shadow:0 4px 12px rgba(0,0,0,0.2);transition:opacity 0.5s;';
            document.body.appendChild(toast);
            setTimeout(function() { toast.style.opacity = '0'; }, 2000);
            setTimeout(function() { toast.remove(); }, 2500);
        }

        function forcevieExam(){
            const currentUrl = window.location.href;

            const reviewMatch = currentUrl.match(/group\/(\d+)\/exam\/(\d+)\/review\/(\d+)/);
            if (reviewMatch) {
                alert("当前已在回顾页，可直接点击「更新题库」收集答案。");
                return;
            }

            const resultMatch = currentUrl.match(/group\/(\d+)\/exam\/(\d+)/);
            if (!resultMatch) {
                alert("请先打开一场考试的结果页或回顾页，再点击「强制看题」。");
                return;
            }
            const groupId = resultMatch[1];
            const examId = resultMatch[2];
            console.log("考试ID:", examId);
            GM_xmlhttpRequest({
                method: "GET",
                url: `https://exambackend.yooc.me/api/exam/result/get?userId=${userId}&token=${userToken}&yibanId=${yibanId}&examId=${examId}`,
                onload: function(response) {
                    if (response.status >= 200 && response.status < 300) {
                        const responseData = JSON.parse(response.responseText);
                        if(responseData.result){
                            const examuserId = responseData.data.examuserId;
                            location.href = `https://exam.yooc.me/group/${groupId}/exam/${examId}/review/${examuserId}`
                        }
                        else{
                            alert("未能成功获取 examuserId，可能是还未参加过这场考试。");
                        }
                    }
                    else{
                        alert("接口请求失败: " + response.status);
                        console.error("接口请求失败:", response.status, response.statusText, response.responseText);
                    }
                }
            })
        }

        function importQuestionBank() {
            importJson(function(error, data) {
                if (error) {
                    console.error("导入题库失败:", error);
                    alert("导入失败: " + error.message);
                    return;
                }

                const oldQuestionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
                const mergedQuestionBank = _.merge({}, oldQuestionBank, data);
                localStorage.setItem('question_bank', JSON.stringify(mergedQuestionBank));

                const message = `题库导入成功！\n导入题库数: ${Object.keys(data).length}\n题库总数: ${Object.keys(mergedQuestionBank).length}`;
                console.log(message.replace(/\n/g, ' '));
                alert(message);
            });
        }

        const SERVER_BASE = 'http://8.138.223.11:8088';

        function uploadQuestionBank(examId) {
            const questionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
            const examData = questionBank[examId];
            if (!examData || Object.keys(examData).length === 0) {
                console.log("该考试题库为空，跳过上传。");
                return;
            }
            GM_xmlhttpRequest({
                method: "POST",
                url: `${SERVER_BASE}/api/question-bank/upload`,
                headers: { "Content-Type": "application/json" },
                data: JSON.stringify({ examId: examId, questionBank: examData }),
                onload: function(response) {
                    if (response.status >= 200 && response.status < 300) {
                        const result = JSON.parse(response.responseText);
                        console.log("题库上传成功:", result.message);
                    } else {
                        console.error("题库上传失败:", response.status, response.responseText);
                    }
                },
                onerror: function(error) {
                    console.error("题库上传请求出错:", error);
                }
            });
        }

        function downloadQuestionBank(examId, callback) {
            GM_xmlhttpRequest({
                method: "GET",
                url: `${SERVER_BASE}/api/question-bank/download?examId=${examId}`,
                onload: function(response) {
                    if (response.status >= 200 && response.status < 300) {
                        const result = JSON.parse(response.responseText);
                        if (result.success && result.questionBank) {
                            const oldQuestionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
                            if (!oldQuestionBank[examId]) oldQuestionBank[examId] = {};
                            _.merge(oldQuestionBank[examId], result.questionBank);
                            localStorage.setItem('question_bank', JSON.stringify(oldQuestionBank));
                            console.log(`题库下载成功，已合并。服务器题目数: ${Object.keys(result.questionBank).length}，本地该考试题目数: ${Object.keys(oldQuestionBank[examId]).length}`);
                        } else {
                            console.log("服务器未找到该考试的题库，将使用本地题库。");
                        }
                    } else if (response.status === 404) {
                        console.log("服务器未找到该考试的题库，将使用本地题库。");
                    } else {
                        console.error("题库下载失败:", response.status, response.responseText);
                    }
                    if (callback) callback();
                },
                onerror: function(error) {
                    console.error("题库下载请求出错:", error);
                    if (callback) callback();
                }
            });
        }

        function importJson(callback) {
            const input = document.createElement('input');
            input.type = 'file';
            input.accept = '.json';
            input.style.display = 'none';
            document.body.appendChild(input);

            input.addEventListener('change', function(event) {
                const file = event.target.files[0];
                if (!file) {
                    callback(new Error('未选择文件'));
                    return;
                }

                const reader = new FileReader();
                reader.onload = function(e) {
                    try {
                        const data = JSON.parse(e.target.result);
                        callback(null, data);
                    } catch (error) {
                        callback(error);
                    }
                };
                reader.onerror = function() {
                    callback(new Error('文件读取失败'));
                };
                reader.readAsText(file);
            });

            input.click();
            document.body.removeChild(input);
        }

        function runExamMode() {
            try {
                const currentUrl = window.location.href;
                const examIdMatch = currentUrl.match(/exam\/(\d+)/);
                const examId = examIdMatch ? examIdMatch[1] : null;
                console.log("考试ID:", examId);
                if (!examId) {
                    alert("未能从URL中解析出 examId");
                    return;
                }
                console.log("正在从服务器下载题库...");
                downloadQuestionBank(examId, function() {
                    console.log("题库下载完成，开始自动答题...");
                    GM_xmlhttpRequest({
                        method: "GET",
                        url: `https://exambackend.yooc.me/api/exam/setting/get?examId=${examId}&userId=${userId}&token=${userToken}&yibanId=${yibanId}`,
                        onload: function(response) {
                            if (response.status >= 200 && response.status < 300) {
                                const responseData = JSON.parse(response.responseText);
                                if(responseData.result){
                                    const examuserId = responseData.data.examuserId;
                                    if (Object.hasOwn(localStorage, `exam-paper-${examuserId}`)){
                                        handleApiResponse2write(JSON.parse(localStorage.getItem(`exam-paper-${examuserId}`)).value.paper);
                                    }
                                    else{
                                        GM_xmlhttpRequest({
                                            method: "GET",
                                            url: `https://exambackend.yooc.me/api/exam/paper/get?examuserId=${examuserId}&token=${userToken}&yibanId=${yibanId}`,
                                            headers: { "Cache-Control": "no-cache", "Pragma": "no-cache" },
                                            onload: function(response) {
                                                if (response.status >= 200 && response.status < 300) {
                                                    const responseData = JSON.parse(response.responseText);
                                                    if (responseData.result){
                                                        handleApiResponse2write(responseData.data);
                                                    } else {
                                                        alert("题目获取失败！");
                                                    }
                                                } else {
                                                    console.error("接口请求失败:", response.status);
                                                }
                                            },
                                            onerror: function(error) { console.error(error); }
                                        });
                                    }
                                } else {
                                    alert("获取 examuserId 失败");
                                }
                            } else {
                                console.error("接口请求失败:", response.status);
                            }
                        },
                        onerror: function(error) { console.error(error); }
                    });
                });
            } catch (error) {
                console.error("自动答题脚本出错:", error);
            }
        }

        function runReviewMode() {
           try {
                const currentUrl = window.location.href;
                const examIdMatch = currentUrl.match(/exam\/(\d+)/);
                const examId = examIdMatch ? examIdMatch[1] : null;
                console.log("考试ID:", examId);
                if (!examId) {
                    console.error("未能从URL中解析出 examId，无法执行操作。");
                    alert("未能从URL中解析出 examId，无法执行操作。");
                    return;
                }
                const examuserIdMatch = currentUrl.match(/review\/(\d+)$/);
                const examuserId = examuserIdMatch ? examuserIdMatch[1] : null;
                console.log("考试用户ID:", examuserId);
                const apiUrl = `https://exambackend.yooc.me/api/exam/answer/get?examuserId=${examuserId}&token=${userToken}&yibanId=${yibanId}`;

                if (!apiUrl || !examId) {
                    console.error("未能构造有效的接口URL，请检查脚本。");
                    return;
                }

                console.log("正在请求接口:", apiUrl);

                GM_xmlhttpRequest({
                    method: "GET",
                    url: apiUrl,
                    headers: {
                        "Cache-Control": "no-cache",
                        "Pragma": "no-cache"
                    },
                    onload: function(response) {
                        if (response.status >= 200 && response.status < 300) {
                            const responseData = JSON.parse(response.responseText);
                            handleApiResponse(responseData, examId);
                        } else {
                            console.error("接口请求失败:", response.status, response.statusText, response.responseText);
                        }
                    },
                    onerror: function(error) {
                        console.error("接口请求发生错误:", error);
                    }
                });
           } catch (error) {
               console.error("收集题库脚本出错:", error);
           }
        }

        function normText(t){return t.replace(/&nbsp;/g,' ').replace(/\t/g,' ').replace(/\s+/g,' ').trim();}

        function cleanOptions(options) {
            var result = [];
            for (var idx = 0; idx < options.length; idx++) {
                var opt = options[idx];
                var text = typeof opt === 'string' ? opt : (Array.isArray(opt) ? opt[0] : String(opt));
                var ta = document.createElement('textarea');
                ta.innerHTML = text;
                text = ta.value;
                var parts = text.split(/\[x\]/);
                for (var pi = 0; pi < parts.length; pi++) {
                    var cleaned = parts[pi].replace(/\t/g, ' ').replace(/\s+/g, ' ').trim();
                    if (cleaned) result.push([cleaned]);
                }
            }
            return result;
        }

        function handleApiResponse2write(data) {
            const questionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
            const examIdMatch = window.location.href.match(/exam\/(\d+)/);
            const examId = examIdMatch ? examIdMatch[1] : null;
            const examBank = examId ? questionBank[examId] : null;

            const bottomEls = document.getElementsByClassName("jsx-3527395752 __ pa-xs flex items-center fs-l");
            const bottom = bottomEls[0];
            const last = bottom.getElementsByClassName("jsx-3527395752 p")[0];
            let span = bottom.getElementsByTagName("span");
            let count_list = span[0].innerText.split("/");
            for (let a = 0; a < count_list[0]; a++) last.click();
            for (let i=0;i<data.length;i++){
                const next = bottom.getElementsByClassName("jsx-3527395752 n")[0];
                const main = document.getElementsByTagName("main")[0];
                const h3 = main.getElementsByTagName("h3")[0];
                let body = h3.parentElement.children[1].children[0];
                let ans_l = body.getElementsByTagName("li");
                for (let j=0;j<data[i].subjects.length;j++){
                    const subjectId = data[i].subjects[j].subjectId.toString();
                    if (examBank && Object.hasOwn(examBank, subjectId)){
                        for (let o=0;o<examBank[subjectId]["answer"].length;o++){
                            for (let p=0;p<ans_l.length;p++){
                                if (normText(examBank[subjectId]["option"][parseInt(examBank[subjectId]["answer"][o])][0])===normText(ans_l[p].children[1].innerHTML.slice(2))){
                                    ans_l[p].click();
                                    break;
                                }
                            }
                        }
                    }
                    else{
                        ans_l[Math.floor(Math.random() * (Math.floor(ans_l.length)))].click();
                    }
                    next.click();
                }
            }
        }

        function handleApiResponse(data, examId) {
            const oldQuestionBank = JSON.parse(localStorage.getItem('question_bank') || '{}');
            if (!data.result) {
                console.log(`题库更新失败！接口返回值异常。`);
                alert(`题库更新失败！接口返回值异常。`);
                return;
            }

            if (!oldQuestionBank[examId]) oldQuestionBank[examId] = {};
            let question_count = 0;
            const question_data = data.data;
            for (let i = 0; i < question_data.length; i++) {
                for (let j = 0; j < question_data[i].subjects.length; j++) {
                    const sub = question_data[i].subjects[j];
                    const subjectId = sub.subjectId.toString();
                    if (!oldQuestionBank[examId][subjectId]) question_count++;
                    oldQuestionBank[examId][subjectId] = {
                        "title": sub.title[0],
                        "option": cleanOptions(sub.option),
                        "answer": JSON.parse(decrypt(sub.answer, yibanId))
                    };
                }
            }
            localStorage.setItem('question_bank', JSON.stringify(oldQuestionBank));

            console.log(`题库更新成功！本次新增/更新了 ${question_count} 道题。`);
            if (question_count > 0) {
                alert(`题库更新成功，新增/更新 ${question_count} 题！`);
            } else {
                alert("题库已是最新，无需更新。");
            }
            uploadQuestionBank(examId);
        }

        function decrypt(_0x1, _0x2) {
            var _0x3 = [121,111,111,99,64,97,100,109,105,110];
            var _0x4 = [52,50,101,48,55,100,50,102,55,49,57,57,99,51,53,100];
            var _0x5 = function(_0x6) {
                var _0x7 = '';
                for (var _0x8 = 0; _0x8 < _0x6.length; _0x8++) {
                    _0x7 += String.fromCharCode(_0x6[_0x8] ^ (_0x8 & 3));
                }
                return _0x7;
            };
            var _0x9 = _0x3.map(function(c){return String.fromCharCode(c)}).join('') + _0x2;
            var _0xa = CryptoJS.MD5(_0x9).toString(CryptoJS.enc.Hex).substr(8, 16);
            var _0xb = _0x4.map(function(c){return String.fromCharCode(c)}).join('');
            var _0xc = CryptoJS.AES.decrypt(_0x1, CryptoJS.enc.Utf8.parse(_0xa), {
                iv: CryptoJS.enc.Utf8.parse(_0xb),
                mode: CryptoJS.mode.CBC,
                padding: CryptoJS.pad.Pkcs7
            });
            return _0xc.toString(CryptoJS.enc.Utf8);
        }

    } // end initWithLicense

    _0xrun(initWithLicense);

})();