<?php

namespace App\Utility;


class Utility
{
    //... Declaration of Constants

    //... Declaration of curlExchangeRates function

    protected function processExchangeRates(string $curlResponse, \DateTime $earliestDate = null){
        $delimiter = ($earliestDate ? $earliestDate : new \DateTime('-20 years'))->format('n/j/Y');
        //split the string into an array based on the delimiter. The first string in the array is the rate string we need
        $ratesString = preg_split(sprintf('("%s")',$delimiter), $curlResponse, 2)[0];

        $headerPattern = '("Rate Date","Currency","Rate Year","Rate Month","Buying Rate","Central Rate","Selling Rate"\r\n)';
        //remove the first line in our rate string and return the result
        return preg_replace($headerPattern, '', $ratesString);
    }
}