cie-calculator-flap/lib/strategies/alg27.js

Easily generate CIE References

'use strict';

var CIEStrategy = require('./cie_strategy.js').CIEStrategy;
var CIEUtils = require('./cie_utils.js').CIEUtils;
var cieUtils = new CIEUtils();

var Alg27 = function() {};

Alg27.prototype = new CIEStrategy();
Alg27.prototype = {
  execute: function(input) {

    var validationRules = {
      reference:  {length: {min: 1,  max: 18}},
      account:    {length: {min: 1,   max: 8}},
      branch:     {length: {min: 1,   max: 8}}
    };

    if (!cieUtils.validateInput(input, validationRules)) {
      var error = new Error('Longitud invalida');
      error.status = '422';
      throw error;
    }

    return applyAlgorithm27(input.reference, input.branch, input.account);
  }
};

module.exports.Alg27 = Alg27;

let applyAlgorithm27 = (reference, sucursal, account) => {
  let validator = new RegExp(/^[0-9A-Z]{3,20}$/g)

  let referenceEncoder = {
    "A": 2, "B": 2, "C": 2, "D": 3, "E": 3,
    "F": 3, "G": 4, "H": 4, "I": 4, "J": 5,
    "K": 5, "L": 5, "M": 6, "N": 6, "O": 6,
    "P": 7, "Q": 7, "R": 7, "S": 8, "T": 8,
    "U": 8, "V": 9, "W": 9, "X": 9, "Y": 0,
    "Z": 0, "0": 0, "1": 1, "2": 2, "3": 3,
    "4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9,
  };

  let fullReference = "";
  // let sucursal = "7006";
  // let account = "00863367";

  if(validator.test(reference)) {
    for(let letter of reference){
      fullReference += referenceEncoder[letter];
    }

    while(fullReference.length < 18){
      fullReference = `0${fullReference}`;
    }

    fullReference = `${account}${fullReference}`;
    fullReference = `00000${fullReference}`;
    fullReference = `${sucursal}${fullReference}`;

    let serie   = [1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37];
    let results = [];
    let serieIndex = 12;

    fullReference = fullReference.split("").reverse().join("");

    for(let number of fullReference) {
      //console.log(`${number} * ${serie[serieIndex]} = ${number * serie[serieIndex]}`);
      results.push(number * serie[serieIndex]);
      serieIndex = (serieIndex !== 0) ? serieIndex - 1 : 12;
    }

    let sum = 0;
    for(let result of results){
      sum += result;
    }

    let res    = sum % 97;
    let digits = 99 - res;

    let getDigits = (number) => {
      return (number.toString().length === 2) ? number : `0${number}`;
    };

    //document.getElementById("response").innerHTML = `${reference}${getDigits(digits)}`;
    return `${reference}${getDigits(digits)}`;
  } else {
    //alert("Input invalid");
    return;
  }
};