// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init({ env: 'yz-7g23c92hf3223f1d' }) // 使用当前云环境

//引入node-xlsx文件
var xlsx = require('node-xlsx');
const db = cloud.database()
// 云函数入口函数
exports.main = async (event, context) => {
    console.log("filename : " + event.filename);
    let fileID = event.fileID;
    let filename = event.filename;
    //通过fileID下载云存储里的excel文件
    const res = await cloud.downloadFile({
        fileID: fileID,
    })
    console.log('下载的文件', res);
    const file_xlsx = res.fileContent
    //解析excel文件
    var files = xlsx.parse(file_xlsx); //获取到已经解析的对象数组
    var arr = files[0].data;
    for (let i = 0; i < arr.length; i++) {
      arr[i][0] = String(arr[i][0]); // 或者 arr[i][0] = arr[i][0].toString();
    }
    console.log('获得内容表格数组', arr);
    var row = 0;
    // console.log(arr[row][0].length + " " + arr[row][0][0]);
    function judgeID(s) {
        var len = s.length;
        if(len == 0) return false;
        var flag = true;
        for(var i = 0; i < arr[row][0].length; ++i)
            if(!(s[i] >= '0' && s[i] <= '9'))
                flag = false;
        return flag;
    }
    while (row <= arr.length) {
        if(arr[row].length == 0) {
            row++;
            continue ;
        }
        if(judgeID(arr[row][0])) break;
        row++;
    }
    // console.log("数据从第" + row + "行开始");
    if(row == arr.length) {
        return "error";
        //返回错误
    }
    // var namelist = "namelist" + filename;
    // console.log("namelist = " + namelist);
    while(row <= arr.length - 1 && arr[row].length > 0 && judgeID(arr[row][0])) {
        var _student_ID = arr[row][0].toString();
        while(_student_ID.length < 9) _student_ID = '0' + _student_ID;
        var _name = arr[row][1];
        var _attendance_count = arr[row][2]; // 提取被点名次数
        if (_attendance_count === undefined || _attendance_count === "") {
            _attendance_count = 0; // 如果为空白，默认设置为0
        }
        var _score = arr[row][3]; // 提取积分
        if (_score === undefined || _score === "") {
            _score = 0; // 如果为空白，默认设置为0
        }
        // console.log(_student_ID + " " + _name);
        db.collection("namelist").add({
            data: {
                student_ID: _student_ID,
                name: _name,
                attendance_count: _attendance_count,
                score: _score,
                filename : filename,
                state : "present"
            }
        })
        row++;
    }
    console.log("数据上传完成");
    console.log(fileID);
    cloud.deleteFile({
        fileList: [fileID],
        success(res) {
            console.log(res, '文件删除成功')
        },
        fail(res) {
            console.log(res, "文件删除失败")
        }
    })
    return "success";
}