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<?php |
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namespace Ksdev\NBPCurrencyConverter; |
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class CurrencyConverter |
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{ |
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private $ratesTableFinder; |
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public function __construct(ExRatesTableFinder $ratesTableFinder) |
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{ |
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$this->ratesTableFinder = $ratesTableFinder; |
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} |
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/** |
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* Get the average exchange rates |
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* |
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* @param \DateTime $pubDate Optional rates table publication date |
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* |
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* @return array |
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* |
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* @throws \Exception |
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*/ |
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public function averageExchangeRates(\DateTime $pubDate = null) |
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{ |
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$ratesTable = $this->ratesTableFinder->getExRatesTable($pubDate); |
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return $ratesTable->parsedContent; |
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} |
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/** |
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* Convert amount from one currency to another |
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* |
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* @param string $fromAmount Amount with four digits after decimal point, e.g. '123.0000' |
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* @param string $fromCurrency E.g. 'USD' or 'EUR' |
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* @param string $toCurrency E.g. 'USD' or 'EUR' |
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* @param \DateTime $pubDate Optional rates table publication date |
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* |
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* @return array |
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* |
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* @throws \Exception |
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*/ |
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public function convert($fromAmount, $fromCurrency, $toCurrency, \DateTime $pubDate = null) |
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{ |
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if (!preg_match('/^\d+\.(\d{4})$/', $fromAmount)) { |
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throw new \Exception('Invalid format of amount'); |
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} |
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$rates = $this->averageExchangeRates($pubDate); |
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$fromCurrency = strtoupper($fromCurrency); |
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$toCurrency = strtoupper($toCurrency); |
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if (!isset($rates['waluty'][$fromCurrency]) || !isset($rates['waluty'][$toCurrency])) { |
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throw new \Exception('Invalid currency code'); |
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} |
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$fromMultiplier = str_replace(',', '.', $rates['waluty'][$fromCurrency]['przelicznik']); |
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$fromAverageRate = str_replace(',', '.', $rates['waluty'][$fromCurrency]['kurs_sredni']); |
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$toMultiplier = str_replace(',', '.', $rates['waluty'][$toCurrency]['przelicznik']); |
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$toAverageRate = str_replace(',', '.', $rates['waluty'][$toCurrency]['kurs_sredni']); |
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bcscale(20); |
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$plnAmount = bcdiv(bcmul($fromAmount, $fromAverageRate), $fromMultiplier); |
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$resultAmount = bcdiv(bcmul($plnAmount, $toMultiplier), $toAverageRate); |
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$roundedResult = BCMathHelper::bcround($resultAmount, 4); |
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return [ |
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'publication_date' => $rates['data_publikacji'], |
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'amount' => $roundedResult, |
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'currency' => $toCurrency |
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]; |
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} |
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} |
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ksdev-pl /
nbp-currency-converter
