gistfile1.js

'use strict';

var config = require('../config/nconf'),
    request = require('request');

var Convert = function(){
    this.saneMax = null;
    this.saneMin = null;
};

Convert.prototype.discount = function(amount, discount){
    var btc_units = 100000000;
    var m = amount * btc_units;
    var discountedAmount = (m + (m * discount));
    return discountedAmount/ btc_units;
};

Convert.prototype.convert = function(amount, exchangeRate, toCurrency, discount) {
    var a = this.discount(amount, discount);
    return {
        amount: a * exchangeRate,
        currency: toCurrency
    }
};

Convert.prototype.getRate = function(callback) {
    var url = config.get('RIPPLE_CHARTS_API');
    var json = {
        "pairs" : [{
            "base":{"currency":"BTC","issuer": config.get('EXCHANGE_ISSUER_ADDRESS')},
            "trade":{"currency":"XRP"}
        }]
    };
    
    request.post({ url: url, json: json }, callback);
    
};

Convert.prototype.sanePrice = function(exchangeRate){
    this.saneMax = config.get('SANE_PRICE_BASE') + (config.get('SANE_PRICE_BASE') * .05);
    this.saneMin = config.get('SANE_PRICE_BASE') - (config.get('SANE_PRICE_BASE') * .05);
    if(exchangeRate < this.saneMax) {
        if(exchangeRate > this.saneMin) {
            return true;
        }
    }
};

Convert.prototype.toXrp = function(amount, callback){
    var self = this;
    self.getRate(function(error, response, body){
      if(error){
          return callback(new Error(error));
      }
      
      var exchangeRate = body[0]['last'];
      var discountBy = config.get('DISCOUNT_PERCENTAGE') / 100;

      var converted = self.convert(amount, exchangeRate, 'XRP', discountBy);
      callback(null, converted);
        
    });
};

module.exports = new Convert();