currency-converter/app/openExchangeRateUtils.js

currency-converter ==================

var currencies = require('./libs/currencies.js');

module.exports.verifyInput = function (convertFrom, convertTo, amount) {
  var checkAmount   = true;
  var checkCurrency = currencies.hasOwnProperty(convertFrom) && 
                      currencies.hasOwnProperty(convertTo);

  if (amount) { checkAmount = !isNaN(amount); }

  return checkAmount && checkCurrency;
};

// Kudos to: http://stackoverflow.com/a/19722641 
module.exports.round = function(num) {
  return +(Math.round(num + "e+2")  + "e-2");
};

module.exports.read = function (localRates, convertFrom, convertTo) {
  var results = {};
  localRates  = localRates.split('\n');

  for (var i = 0 ; i < localRates.length; i ++) {
    if (results[convertFrom] && results[convertTo]) {
      return [ results[convertFrom], results[convertTo] ];
    }

    var temp      = localRates[i].split('=');
    var currency  = temp[0];
    temp          = temp[1].split(' ');
    var symbol    = temp[0];
    var rate      = temp[1];
    results[currency] = { 'symbol' : symbol, 'rate' : rate };
  }
};

module.exports.write = function (liveRates) {
  var ratesTxt = '';
  
  for (var currency in liveRates) {
    if (currencies.hasOwnProperty(currency)) {
      var symbol = currencies[currency]["symbol_native"];
      var rate   = module.exports.round(liveRates[currency]);
      ratesTxt += currency + '=' + symbol + ' ' + rate + '\n'      
    }
  }

  return ratesTxt.slice(0, -1);
};


module.exports.formatConversion = function (options, rates) {
  var convertedRate = (options.amount / rates[0]['rate']) * rates[1]['rate'];
  return {
    'currency'  : options.convertTo,
    'symbol'    : rates[1].symbol,
    'amount'    : module.exports.round(convertedRate) };
 };

 module.exports.formatConversionRate = function (options, rates) {
  return module.exports.round( ((1/rates[0]['rate']) * rates[1]['rate']) );
 };