let originalData = [];
let updatedData = [];
let workbook;
let sheetName;
let skippedStudents = [];
// 导入学生名单
document.getElementById('excelFileInput').addEventListener('change', function (e) {
    var file = e.target.files[0];
    if (!file) {
        return;
    }
    var reader = new FileReader();
    reader.onload = function (e) {
        var data = new Uint8Array(e.target.result);
        workbook = XLSX.read(data, { type: 'array' });
        sheetName = workbook.SheetNames[0];
        var worksheet = workbook.Sheets[sheetName];
        originalData = XLSX.utils.sheet_to_json(worksheet);
        updatedData = JSON.parse(JSON.stringify(originalData));
        var displayDiv = document.getElementById('excelDataDisplay');
        // 添加表头
        displayDiv.innerHTML = '<div style="display: flex; justify-content: space-between;"><span>学号</span><span>姓名</span><span>积分</span></div>';
        updatedData.forEach(function (row) {
            var rowDiv = document.createElement('div');
            Object.keys(row).forEach(key => {
                var cellDiv = document.createElement('span');
                cellDiv.textContent = row[key] + ' ';
                rowDiv.appendChild(cellDiv);
            });
            displayDiv.appendChild(rowDiv);
        });
    };
    reader.readAsArrayBuffer(file);
});

// 点名按钮
document.getElementById('callButton').addEventListener('click', function () {
    // 去除上一次的高亮
    var displayDiv = document.getElementById('excelDataDisplay');
    Array.from(displayDiv.children).forEach(child => child.style.backgroundColor = '');

    // 过滤掉因上次回答问题得分超过2.5而跳过的学生
    let eligibleStudents = updatedData.filter(student => !skippedStudents.includes(student));

    // 计算总积分
    let totalPoints = eligibleStudents.reduce((acc, student) => {
        let pointsKey = Object.keys(student).find(key => key.includes('积分'));
        return acc + (pointsKey ? parseInt(student[pointsKey]) : 0);
    }, 0);

    // 确保总积分不为零
    if (totalPoints === 0) {
        // 如果总积分为零，可以随机选择一个学生或者采取其他处理方式
        let randomIndex = Math.floor(Math.random() * eligibleStudents.length);
        let selectedStudent = eligibleStudents[randomIndex];
        var displayDiv = document.getElementById('excelDataDisplay');
        var rows = Array.from(displayDiv.children).slice(1);
        var selectedRow = rows.find(row => row.querySelector('span').textContent.trim() === selectedStudent[Object.keys(selectedStudent)[0]]);
        selectedRow.style.backgroundColor = 'lightblue';
        // 获取选中行的学号和姓名并显示在主页面
        var studentInfo = selectedRow.querySelectorAll('span');
        var studentId = studentInfo[0].textContent.trim();
        var studentName = studentInfo[1].textContent.trim();
        var selectedStudentDiv = document.getElementById('selectedStudentInfo');
        selectedStudentDiv.innerHTML = `<p>点到的学生学号：${studentId}，姓名：${studentName}</p>`;
        return;
    }

    // 计算每个学生被选中的概率（总积分越高，被点到的概率越低）
    let probabilities = eligibleStudents.map(student => {
        let pointsKey = Object.keys(student).find(key => key.includes('积分'));
        let studentPoints = pointsKey ? parseInt(student[pointsKey]) : 0;
        return 1 / (studentPoints + 1) / totalPoints;
    });

    // 使用 Math.random 和 Date.now 作为种子
    let randomValue = Math.random() + Date.now() % 1000 / 1000;
    let cumulativeProbability = 0;
    let selectedStudent;
    for (let i = 0; i < eligibleStudents.length; i++) {
        cumulativeProbability += probabilities[i];
        if (randomValue < cumulativeProbability) {
            selectedStudent = eligibleStudents[i];
            break;
        }
    }

    if (selectedStudent) {
        var displayDiv = document.getElementById('excelDataDisplay');
        var rows = Array.from(displayDiv.children).slice(1);
        var selectedRow = rows.find(row => row.querySelector('span').textContent.trim() === selectedStudent[Object.keys(selectedStudent)[0]]);
        selectedRow.style.backgroundColor = 'lightblue';
        // 获取选中行的学号和姓名并显示在主页面
        var studentInfo = selectedRow.querySelectorAll('span');
        var studentId = studentInfo[0].textContent.trim();
        var studentName = studentInfo[1].textContent.trim();
        var selectedStudentDiv = document.getElementById('selectedStudentInfo');
        selectedStudentDiv.innerHTML = `<p>点到的学生学号：${studentId}，姓名：${studentName}</p>`;
    }
});

// 到达教室按钮
document.getElementById('arriveClassroom').addEventListener('click', function () {
    var displayDiv = document.getElementById('excelDataDisplay');
    var rows = Array.from(displayDiv.children).slice(1);
    if (rows.length > 0) {
        var selectedRow = rows.find(row => row.style.backgroundColor === 'lightblue');
        if (selectedRow) {
            var studentInfo = selectedRow.querySelectorAll('span');
            var studentId = studentInfo[0].textContent.trim();
            var studentName = studentInfo[1].textContent.trim();
            // 查找对应的学生并增加积分
            var student = updatedData.find(student => student[Object.keys(student)[0]] === studentId && student[Object.keys(student)[1]] === studentName);
            if (student) {
                let pointsKey = Object.keys(student).find(key => key.includes('积分'));
                if (pointsKey) {
                    student[pointsKey] = parseFloat(student[pointsKey]) + 1;
                    // 更新显示
                    var rowSpans = selectedRow.querySelectorAll('span');
                    rowSpans[rowSpans.length - 1].textContent = student[pointsKey];
                }
            }
        }
    }
});

// 准确重复所提问的问题
document.getElementById('repeatedQuestionYes').addEventListener('click', function () {
    var displayDiv = document.getElementById('excelDataDisplay');
    var rows = Array.from(displayDiv.children).slice(1);
    if (rows.length > 0) {
        var selectedRow = rows.find(row => row.style.backgroundColor === 'lightblue');
        if (selectedRow) {
            var studentInfo = selectedRow.querySelectorAll('span');
            var studentId = studentInfo[0].textContent.trim();
            var studentName = studentInfo[1].textContent.trim();
            // 查找对应的学生并增加积分
            var student = updatedData.find(student => student[Object.keys(student)[0]] === studentId && student[Object.keys(student)[1]] === studentName);
            if (student) {
                let pointsKey = Object.keys(student).find(key => key.includes('积分'));
                if (pointsKey) {
                    student[pointsKey] = parseFloat(student[pointsKey]) + 0.5;
                    // 更新显示
                    var rowSpans = selectedRow.querySelectorAll('span');
                    rowSpans[rowSpans.length - 1].textContent = student[pointsKey];
                }
            }
        }
    }
});

// 不能准确重复所提问的问题
document.getElementById('repeatedQuestionNo').addEventListener('click', function () {
    var displayDiv = document.getElementById('excelDataDisplay');
    var rows = Array.from(displayDiv.children).slice(1);
    if (rows.length > 0) {
        var selectedRow = rows.find(row => row.style.backgroundColor === 'lightblue');
        if (selectedRow) {
            var studentInfo = selectedRow.querySelectorAll('span');
            var studentId = studentInfo[0].textContent.trim();
            var studentName = studentInfo[1].textContent.trim();
            // 查找对应的学生并减少积分
            var student = updatedData.find(student => student[Object.keys(student)[0]] === studentId && student[Object.keys(student)[1]] === studentName);
            if (student) {
                let pointsKey = Object.keys(student).find(key => key.includes('积分'));
                if (pointsKey) {
                    student[pointsKey] = parseFloat(student[pointsKey]) - 1;
                    // 更新显示
                    var rowSpans = selectedRow.querySelectorAll('span');
                    rowSpans[rowSpans.length - 1].textContent = student[pointsKey];
                }
            }
        }
    }
});

// 增加自定义分数
document.getElementById('addScoreButton').addEventListener('click', function () {
    var inputScore = parseFloat(document.getElementById('addScoreInput').value);
    if (inputScore >= 0.5 && inputScore <= 3 && !isNaN(inputScore)) {
        var displayDiv = document.getElementById('excelDataDisplay');
        var rows = Array.from(displayDiv.children).slice(1);
        if (rows.length > 0) {
            var selectedRow = rows.find(row => row.style.backgroundColor === 'lightblue');
            if (selectedRow) {
                var studentInfo = selectedRow.querySelectorAll('span');
                var studentId = studentInfo[0].textContent.trim();
                var studentName = studentInfo[1].textContent.trim();
                // 查找对应的学生并增加积分
                var student = updatedData.find(student => student[Object.keys(student)[0]] === studentId && student[Object.keys(student)[1]] === studentName);
                if (student) {
                    let pointsKey = Object.keys(student).find(key => key.includes('积分'));
                    if (pointsKey) {
                        student[pointsKey] = parseFloat(student[pointsKey]) + inputScore;
                        // 更新显示
                        var rowSpans = selectedRow.querySelectorAll('span');
                        rowSpans[rowSpans.length - 1].textContent = student[pointsKey];

                        // 如果得分超过 2.5 分，将该学生加入跳过列表
                        if (student[pointsKey] > 2.5) {
                            skippedStudents.push(student);
                        }
                    }
                }
            }
        }
    } else {
        alert('输入的分数应在 0.5 到 3 之间且为有效数字。');
    }
});