// ==UserScript==
// @name         NNNU加权平均成绩一键查询
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  一键计算令人伤心的加权平均成绩
// @author       卢本伟
// @match        *://jw.nnnu.edu.cn/jsxsd/kscj/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function addButton() {
        const searchForm = document.querySelector("#kscjQueryForm #search-form-content");
        // const searchForm = document.getElementById("search-form-content") || document.body;
        if (!searchForm) return;

        // 创建按钮
        const btn = document.createElement("button");
        btn.textContent = "一键计算加权平均成绩";
        btn.style.marginLeft = "10px";
        btn.style.background = "#4CAF50";
        btn.style.color = "white";
        btn.style.padding = "6px 12px";
        btn.style.border = "none";
        btn.style.borderRadius = "5px";
        btn.style.cursor = "pointer";


        btn.onclick = async () => {
            const semesters = ["2024-2025-1", "2024-2025-2"];
            const grades = [];

            for (const semester of semesters) {
                const formData = new FormData();
                formData.append("kksj", semester);

                try {
                    const res = await fetch("/jsxsd/kscj/cjcx_list", {
                        method: "POST",
                        body: formData,
                        credentials: "include"
                    });
                    const html = await res.text();
                    const parser = new DOMParser();
                    const doc = parser.parseFromString(html, "text/html");
                    const table = doc.querySelector("#dataList");
                    if (!table) continue;

                    const rows = table.querySelectorAll("tr");
                    rows.forEach(row => {
                        const cells = row.querySelectorAll("td");
                        if (cells.length < 10) return;
                        if (cells[1].innerText.trim() !== semester) return;

                        grades.push({
                            semester: semester,
                            courseNum: cells[0].innerText.trim(),
                            courseName: cells[3].innerText.trim(),
                            score: cells[4].innerText.trim(),
                            credit: cells[6].innerText.trim()
                        });
                    });
                } catch (err) {
                    console.error(err);
                }
            }

            if (grades.length > 0) {
                // 先按学期分类
                const semesterMap = {};
                grades.forEach(g => {
                    if (!semesterMap[g.semester]) semesterMap[g.semester] = [];
                    semesterMap[g.semester].push(g);
                });

                // 计算总绩点（优不参与）
                let totalScore = 0;
                let totalCredit = 0;
                grades.forEach(g => {
                    const score = parseFloat(g.score);
                    const credit = parseFloat(g.credit);
                    if (!isNaN(score) && !isNaN(credit) && g.score !== "优") {
                        totalScore += score * credit;
                        totalCredit += credit;
                    }
                });
                const gpa = (totalCredit > 0 ? (totalScore / totalCredit).toFixed(3) : "0.00");

                // 美化表格样式
                let htmlTable = `
                <div style="font-family: Arial, sans-serif; padding: 20px;">
                    <h2 style="text-align:center; color:#4CAF50;">加权平均成绩：${gpa}</h2>
                    <div style="text-align:center; color:#888; font-size:17px; margin-bottom:5px;">区区${gpa}分，拿什么跟我权辉抗衡？这点分数就别用工具了，老老实实自己动手算吧，也算是锻炼一下脑子了</div>
                    <table border="1" cellpadding="8" cellspacing="0" style="border-collapse: collapse; width: 100%; text-align: center;">
                        <thead style="background-color: #4CAF50; color: white;">
                            <tr>
                                <th>学期</th>
                                <th>ID</th>
                                <th>课程名称</th>
                                <th>成绩</th>
                                <th>学分</th>
                                <th>是否参与计算</th>
                            </tr>
                        </thead>
                        <tbody>
                `;

                for (const semester in semesterMap) {
                    semesterMap[semester].forEach(g => {
                        const participate = g.score === "优" ? "❌" : "✅";
                        htmlTable += `
                        <tr style="background-color:#f9f9f9;">
                            <td>${g.semester}</td>
                            <td>${g.courseNum}</td>
                            <td>${g.courseName}</td>
                            <td>${g.score}</td>
                            <td>${g.credit}</td>
                            <td>${participate}</td>
                        </tr>`;
                    });
                }

                htmlTable += `
                        </tbody>
                    </table>
                </div>
                `;

                const newWindow = window.open();
                newWindow.document.write(htmlTable);
                newWindow.document.close();

            } else {
                alert("未找到成绩数据");
            }
        };

        searchForm.appendChild(btn);
    }

    window.addEventListener("load", addButton);
})();