const fs = require('fs')
const readXlsxFile = require('read-excel-file/node')

const guaranteeSerialsPath = './static/uploads/serials'
const productSerialsPath = './static/uploads/serials_products'

const serialChecker = async (serial, type = 'guaranteeSerial', g = 1) => {
  return new Promise(async (reso, rej) => {
    let exelsPath;
    if (type === 'guaranteeSerial') exelsPath = guaranteeSerialsPath + `/${g}`;
    if (type === 'orginality') exelsPath = productSerialsPath + `/${g}`;

    const lowerSerial = serial.toLowerCase();

    try {
      const serialFiles = await fs.readdirSync(exelsPath);

      serialFiles.forEach(async(file, i)=>{
        const exelFile = await readXlsxFile(`${exelsPath}/${file}`);

        for (const row of exelFile) {
          for (const col of row) {
            if (col == lowerSerial) {
              reso(row[2]);
              return; // Serial found, exit loop
            }
          }
        }
        if((serialFiles.length - 1) <= i){
          rej("این کد در سامانه موجود نیست")
        }
      }) 
     
    } catch (e) {
      console.log(e);
      rej(new Error(e));
    }
  });
};

module.exports.serialChecker = serialChecker