// ==UserScript==
// @name         课程作业自动答题 + 点击交卷（仅一次）
// @namespace    http://tampermonkey.net/
// @version      0.0.1
// @description  自动勾选答案，然后自动点击一次交卷按钮（不处理确认弹窗）
// @match        https://kc.jxjypt.cn/paper/start*
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    function waitForJQuery(callback) {
        if (window.jQuery) {
            callback(window.jQuery);
        } else {
            setTimeout(() => waitForJQuery(callback), 100);
        }
    }

    waitForJQuery(function($) {
        // 创建浮动日志面板
        const panel = $(`
            <div id="autoAnswerPanel" style="position:fixed; bottom:20px; right:20px; z-index:99999;
                background:#fff; border-radius:8px; box-shadow:0 2px 12px rgba(0,0,0,0.2);
                padding:12px; width:200px; text-align:center; font-family:微软雅黑,sans-serif;">
                <div style="margin-bottom:8px; font-weight:bold; color:#2c3e50;">🤖 自动答题助手</div>
                <div id="answerLog" style="font-size:12px; color:#666; max-height:150px; overflow-y:auto; text-align:left;"></div>
            </div>
        `).appendTo('body');

        function log(msg) {
            $('#answerLog').prepend(`<div>${new Date().toLocaleTimeString()} - ${msg}</div>`);
            if ($('#answerLog div').length > 20) $('#answerLog div:last').remove();
        }

        // 从解析区获取答案字母
        function getAnswerFromSolution($question) {
            const $solution = $question.find('.solution');
            if (!$solution.length) return null;
            const answerText = $solution.find('.right').text().trim();
            if (!answerText) return null;
            const match = answerText.match(/[A-D]/i);
            return match ? match[0].toUpperCase() : null;
        }

        // 自动答题
        function autoAnswer() {
            log('开始扫描题目...');
            let success = 0, fail = 0;
            $('.m-question').each(function(idx) {
                const $q = $(this);
                const questionText = $q.find('.sub-dotitle pre').text().trim();
                const ans = getAnswerFromSolution($q);
                if (!ans) {
                    log(`❌ 第${idx+1}题 未找到答案`);
                    fail++;
                    return;
                }
                const $opt = $q.find(`dd[data-value="${ans}"]`);
                if (!$opt.length) {
                    log(`⚠️ 第${idx+1}题 答案${ans}无对应选项`);
                    fail++;
                    return;
                }
                $opt.click();
                $opt[0].dispatchEvent(new Event('click', { bubbles: true }));
                log(`✅ 第${idx+1}题 已选 ${ans}`);
                success++;
            });
            log(`答题完成：成功 ${success}，失败 ${fail}`);
            return success;
        }

        // 只点击一次交卷按钮，不处理弹窗
        let submitted = false;  // 确保只执行一次
        function clickSubmitOnce() {
            if (submitted) return;
            const $btn = $('#btn_submit');
            if (!$btn.length) {
                log('❌ 未找到交卷按钮');
                return;
            }
            submitted = true;
            log('点击交卷按钮（仅一次）');
            $btn.click();
            $btn[0].dispatchEvent(new Event('click', { bubbles: true }));
            log('交卷按钮已点击，请手动确认弹窗（如有）');
        }

        // 入口：自动答题，然后点击交卷
        let autoExecuted = false;
        function run() {
            if (autoExecuted) return;
            autoExecuted = true;
            log('自动流程启动...');
            setTimeout(() => {
                autoAnswer();
                // 答题完成后延迟 1.5 秒再点击交卷
                setTimeout(() => {
                    clickSubmitOnce();
                }, 1500);
            }, 1000);
        }

        run();
        log('脚本已加载，将自动答题并点击一次交卷按钮');
    });
})();