// ==UserScript==
// @name         超星学习通自动答题 - 终极适配版
// @namespace    http://tampermonkey.net/
// @version      1.9.2
// @description  DeepSeek搜题 + 自动翻页 + 进度监控 + 全题型适配 + 暂停功能
// @author       dmhnb6
// @match        *://mooc1.chaoxing.com/mooc-ans/mooc2/work/dowork*
// @grant        GM_xmlhttpRequest
// @connect      api.deepseek.com
// ==/UserScript==

(function() {
    'use strict';

    // ======== 用户配置区 ========
    const API_KEY = '您的_DEEPSEEK_API_KEY'; 
    const DELAY = 100; // 每题基础间隔（毫秒）
    // ===========================

    let isPaused = false;
    let isRunning = false;
    let currentIdx = 0; // 全局进度变量：支持暂停后继续和重新开始
    const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));

    // UI 组件变量
    let progressBar, progressText, statusLabel, startBtn, pauseBtn;

    // 创建 UI 控制面板
    function createUI() {
        const panel = document.createElement('div');
        panel.style = "position:fixed;top:10px;left:50%;transform:translateX(-50%);z-index:10000;width:420px;background:#fff;padding:15px;border-radius:10px;box-shadow:0 4px 15px rgba(0,0,0,0.3);font-family:sans-serif;border:1px solid #ddd;";
        panel.innerHTML = `
            <div style="margin-bottom:10px;font-weight:bold;color:#333;display:flex;justify-content:space-between;">
                <span>学习通答题助手 v1.9.2</span>
                <span id="auto-status-label" style="color:#f39c12;font-size:12px;">待命</span>
            </div>
            <div style="width:100%;background:#eee;border-radius:5px;height:10px;overflow:hidden;margin-bottom:10px;">
                <div id="auto-progress-bar" style="width:0%;height:100%;background:#4CAF50;transition:width 0.3s;"></div>
            </div>
            <div style="display:flex;justify-content:space-between;align-items:center;">
                <span id="auto-progress-text" style="font-size:12px;color:#666;">准备就绪</span>
                <div>
                    <button id="auto-pause-btn" style="padding:5px 10px;background:#e74c3c;color:#fff;border:none;border-radius:4px;cursor:pointer;margin-right:5px;display:none;">暂停</button>
                    <button id="auto-start-btn" style="padding:5px 15px;background:#2ecc71;color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:bold;">开始自动答题</button>
                </div>
            </div>
        `;
        document.body.appendChild(panel);

        progressBar = document.getElementById('auto-progress-bar');
        progressText = document.getElementById('auto-progress-text');
        statusLabel = document.getElementById('auto-status-label');
        startBtn = document.getElementById('auto-start-btn');
        pauseBtn = document.getElementById('auto-pause-btn');

        // 开始/重新开始按钮点击事件
        startBtn.onclick = () => {
            if (!isRunning) {
                currentIdx = 0; // 重新开始时将索引归零
                isRunning = true;
                isPaused = false;
                startBtn.style.display = 'none';
                pauseBtn.style.display = 'inline-block';
                pauseBtn.innerText = '暂停';
                pauseBtn.style.background = '#e74c3c';
                startSolve();
            }
        };

        // 暂停/恢复按钮点击事件
        pauseBtn.onclick = () => {
            isPaused = !isPaused;
            pauseBtn.innerText = isPaused ? '恢复' : '暂停';
            pauseBtn.style.background = isPaused ? '#f1c40f' : '#e74c3c';
            statusLabel.innerText = isPaused ? '已暂停' : '运行中';
        };
    }

    // 调用 DeepSeek API
    async function getAIResponse(question, options, type) {
        let sys = "你是一个助手。";
        if (type === "单选题" || type === "判断题") sys = "只回答案字母或'正确'/'错误'，不解释。";
        else if (type === "多选题") sys = "只回答正确字母组合，如ABC，不解释。";
        else if (type === "填空题") sys = "多空答案用###分隔，不解释。";
        else if (type === "简答题") sys = "提供精炼答案内容。";

        return new Promise((resolve) => {
            GM_xmlhttpRequest({
                method: "POST",
                url: "https://api.deepseek.com/chat/completions",
                headers: { "Content-Type": "application/json", "Authorization": `Bearer ${API_KEY}` },
                data: JSON.stringify({
                    model: "deepseek-chat",
                    messages: [{ role: "system", content: sys }, { role: "user", content: `题型:${type}\n题目:${question}\n${options ? '选项:' + options : ''}` }],
                    temperature: 0.1
                }),
                onload: (res) => {
                    try { resolve(JSON.parse(res.responseText).choices[0].message.content.trim()); } catch { resolve(null); }
                },
                onerror: () => resolve(null)
            });
        });
    }

    async function startSolve() {
        const sheetItems = document.querySelectorAll('.topicNumber_list li');
        const total = sheetItems.length;

        // 使用外部作用域的 currentIdx 实现断点续答
        for (; currentIdx < total; currentIdx++) {
            // 暂停检查点
            while (isPaused) {
                await sleep(300);
            }

            // 更新进度 UI
            const percent = Math.floor(((currentIdx + 1) / total) * 100);
            progressBar.style.width = `${percent}%`;
            progressText.innerText = `${currentIdx + 1} / ${total} (${percent}%)`;

            const item = sheetItems[currentIdx];
            statusLabel.innerText = `跳转至第 ${currentIdx + 1} 题...`;
            item.click();
            await sleep(200); 

            const qId = item.getAttribute('data');
            const q = document.querySelector(`.questionLi[data="${qId}"]`) || document.querySelector('.questionLi');
            
            if (q) {
                const type = q.getAttribute('typeName') || "单选题";
                const titleEl = q.querySelector('h3.mark_name');
                const questionText = titleEl ? titleEl.innerText.replace(/\s+/g, ' ').trim() : "";
                
                statusLabel.innerText = `正在搜题: 第 ${currentIdx + 1} 题...`;

                if (type === "填空题" || type === "简答题") {
                    const response = await getAIResponse(questionText, null, type);
                    if (response) {
                        const answers = type === "填空题" ? response.split('###') : [response];
                        const editors = q.querySelectorAll('textarea[id^="answer"]');
                        for (let idx = 0; idx < editors.length; idx++) {
                            const editorId = editors[idx].id;
                            if (window.unsafeWindow && window.unsafeWindow.UE) {
                                try {
                                    const ue = window.unsafeWindow.UE.getEditor(editorId);
                                    ue.ready(() => { 
                                        ue.setContent(answers[idx] || answers[0]);
                                        if (window.unsafeWindow.loadEditorAnswerd) window.unsafeWindow.loadEditorAnswerd(qId, type === "填空题" ? 2 : 4);
                                    });
                                } catch(e) {}
                            }
                        }
                    }
                } else {
                    const optionElements = q.querySelectorAll('.answerBg');
                    let opts = Array.from(optionElements).map(opt => opt.innerText.trim()).join(' | ');
                    const result = await getAIResponse(questionText, opts, type);
                    if (result) {
                        const resUpper = result.toUpperCase();
                        optionElements.forEach(opt => {
                            const letter = opt.querySelector('[class*="num_option"]')?.innerText.trim().toUpperCase();
                            if (letter && resUpper.includes(letter)) {
                                if (opt.getAttribute('aria-checked') !== 'true') opt.click();
                            } else if ((resUpper.includes("正确") || resUpper === "A") && opt.innerText.includes("正确")) {
                                opt.click();
                            } else if ((resUpper.includes("错误") || resUpper === "B") && opt.innerText.includes("错误")) {
                                opt.click();
                            }
                        });
                    }
                }
            }
            
            statusLabel.innerText = `第 ${currentIdx + 1} 题已完成，休息中...`;
            await sleep(DELAY + Math.random() * 200);
        }

        // 运行结束后的重置逻辑
        isRunning = false;
        statusLabel.innerText = "全部作答完成";
        pauseBtn.style.display = 'none';
        startBtn.style.display = 'inline-block';
        startBtn.innerText = '重新开始'; 
        alert("作答完毕，请人工检查后提交。\n（多次运行可提高正确率）");
    }

    window.addEventListener('load', () => setTimeout(createUI, 2000));
})();