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: /var/www/stp-bhaktisagar-backend/src/util/ [ drwxrwxr-x ]
name : app.util.js
 const fs = require("fs");
const path = require("path");
let converter = require("json-2-csv");
const Excel = require("exceljs");
function bufferToStream(buffer) {
  let stream = new Duplex();
  stream.push(buffer);
  stream.push(null);
  return stream;
}

exports.sleep = (delay = 1000) => {
  return new Promise((res, rej) => {
    setTimeout(() => {
      res();
    }, delay);
  });
};

exports.writeJsonFile = (filename, data) => {
  let filePath = path.resolve("build", `${filename}.json`);

  ////json file ////////
  fs.writeFileSync(filePath, JSON.stringify(data));
  //////////
};

exports.writeCSVFile = async (filename, data) => {
  let csvfilePath = path.resolve("build", `${filename}.csv`);
  const csv = await converter.json2csv(data);
  fs.writeFileSync(csvfilePath, csv);
};

exports.getRndInteger = (min, max) => {
  return Math.floor(Math.random() * (max - min + 1)) + min;
};

exports.csvToJson = (filePath) => {
  return new Promise(async (res, rej) => {
    let pathData = path.parse(filePath);

    const workbook = new Excel.Workbook();
    const reader = fs.createReadStream(filePath);
    console.log("file reading...", filePath);
    const worksheet = await workbook.csv.read(reader);
    let header = [];
    let data = [];
    worksheet.eachRow(function (row, rowNumber) {
      // console.log(row.values);
      if (rowNumber == 1) {
        row.eachCell(function (cell, colNumber) {
          header = [...header, cell.value];
          // console.log('Cell ' + colNumber + ' = ' + cell.value);
        });
      } else {
        let item = {};
        row.eachCell(function (cell, colNumber) {
          // console.log(colNumber,header[colNumber - 1])
          item = { ...item, [header[colNumber - 1]]: cell.value };

          // console.log('Cell ' + colNumber );
        });
        data.push(item);
      }
    });

    console.log("csvToJson Success", header);

    res(data);
  });
};

exports.trimDirFiles = (no = 10) => {
  let dirPath = path.resolve("bkp");
  fs.readdir(dirPath, (err, files) => {
    let filterFiles = files
      .map((file) => {
        let filePath = path.resolve("bkp", file);
        let stat = fs.statSync(filePath);
        return { filePath, file, ctime: stat.ctime };
      })
      .sort((a, b) => {
        return b.ctime.getTime() - a.ctime.getTime();
      })
      .slice(no);
    filterFiles.forEach((r) => {
      fs.unlink(r.filePath, () => {});
    });
  });
};

/////get columns
//Array.from( $0.children).map(o=>o.innerText).join('=?,')
// Object.keys({

// }).map(p=>`data['${p}']`).join()