let globalStudent = null;
let globalnumber =0;
async function uploadFile() {
    const fileInput = document.getElementById('fileInput'); // 获取文件输入元素
    const url = window.location.href;
    
    console.log(fileInput);
    // 创建一个 URL 对象
    const urlObj = new URL(url);

    // 使用 URLSearchParams 获取查询参数
    const params = new URLSearchParams(urlObj.search);

    // 获取 'number' 参数的值
    globalnumber  = params.get('number');
    
    // 检查是否选中了文件
    if (fileInput.files.length === 0) {
        alert('请先选择一个文件！');
        return;
    }

    const file = fileInput.files[0]; // 获取第一个文件

    // 检查文件类型
    const allowedTypes = ['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/vnd.ms-excel']; // 允许的文件类型
    if (!allowedTypes.includes(file.type)) {
        alert('请上传有效的 Excel 文件！');
        return;
    }

    // 检查文件大小（例如：限制为 5MB）
    const maxSize = 5 * 1024 * 1024; // 5MB
    if (file.size > maxSize) {
        alert('文件大小不能超过 5MB！');
        return;
    }

    const formData = new FormData();
    formData.append('file', file);

    try {
        const response = await fetch(`http://10.133.39.58:8000/${globalnumber}/upload`, {
    method: 'POST',
    body: formData
});

        if (!response.ok) {
            throw new Error('文件上传失败。');
        }

        const data = await response.json();
        console.log(data);
        
    } 
    catch (error) {
        console.error('错误:', error);
        alert('上传失败: ' + error.message);
    }
}




async function getRandomStudent() {

    console.log('haha');
    const response = await fetch(`http://10.133.39.58:8000/${globalnumber}/random-call`, 
        {
            method: 'POST',
        });
    const student = await response.json();
    
    globalStudent=student;
    console.log(student);
    document.getElementById('picked').innerText = `Selected: ${student.name} (ID: ${student.id}) (points: ${student.points})`;
}



async function createroom() {
    const roomNumber = document.getElementById('roomNumber').value;
    if (roomNumber.trim() === '') {
        alert('房间号码不能为空！');
        this.isModalVisible = false;
        return;
    }
    
    globalnumber = roomNumber;
    console.log(roomNumber);
    try {
        const response = await fetch(`http://10.133.39.58:8000/create-class/${globalnumber}`, {
            method: 'POST',
        });

        if (!response.ok) {
            throw new Error('文件上传失败。');
        }

        const data = await response.json(); // 解析响应数据（假设返回的是 JSON 格式）
        console.log('房间创建成功:', data); // 输出成功消息或处理数据
        alert(data.message);

    } catch (error) {
        console.error('发生错误:', error.message); // 输出错误信息
        alert(`连接后端服务器失败: ${error.message}`); // 弹窗显示错误信息
    }

    setTimeout(() => {
        window.location.href = `index.html?number=${roomNumber}`;
    }, 300); // 等待1秒

}






async function changepoints(chan) 
{
    const idi = globalStudent.id;
    const namei = globalStudent.name;
    const pointsi = chan;
    globalStudent.points+=chan;
    
    const response = await fetch(`http://10.133.39.58:8000/${globalnumber}/change-points`,
    {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            id: String(idi),
            name: String(namei),
            points: parseFloat(pointsi)
        }),
    });
    response.json().then(result => {
        console.log(result); // 输出 Promise 的结果
    }).catch(error => {
        console.error("发生错误:", error);
    });

    document.getElementById('picked').innerText = `Selected: ${globalStudent.name} (ID: ${globalStudent.id}) (points: ${globalStudent.points})`;

}