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<?php

namespace Money\Exchange;

use Money\Currency;
use Money\CurrencyPair;
use Money\Exception\UnresolvableCurrencyPairException;
use Money\Exchange;

/**
 * Tries the reverse of the currency pair if one is not available.
 *
 * Note: adding nested ReversedCurrenciesExchange could cause a huge performance hit.
 *
 * @author Márk Sági-Kazár <[email protected]>
 */
final class ReversedCurrenciesExchange implements Exchange
{
    /**
     * @var Exchange
     */
    private $exchange;

    public function __construct(Exchange $exchange)
    {
        $this->exchange = $exchange;
    }

    /**
     * {@inheritdoc}
     */
    public function quote(Currency $baseCurrency, Currency $counterCurrency)
    {
        try {
            return $this->exchange->quote($baseCurrency, $counterCurrency);
        } catch (UnresolvableCurrencyPairException $exception) {
            try {
                $currencyPair = $this->exchange->quote($counterCurrency, $baseCurrency);

                return new CurrencyPair($baseCurrency, $counterCurrency, 1 / $currencyPair->getConversionRatio());
            } catch (UnresolvableCurrencyPairException $inversedException) {
                throw $exception;
            }
        }
    }
}