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<?php
declare(strict_types=1);
namespace Money;
use InvalidArgumentException;
use function sprintf;
/**
* Provides a way to convert Money to Money in another Currency using an exchange rate.
*/
final class Converter
{
private Currencies $currencies;
private Exchange $exchange;
public function __construct(Currencies $currencies, Exchange $exchange)
{
$this->currencies = $currencies;
$this->exchange = $exchange;
}
public function convert(Money $money, Currency $counterCurrency, int $roundingMode = Money::ROUND_HALF_UP): Money
{
return $this->convertAgainstCurrencyPair(
$money,
$this->exchange->quote(
$money->getCurrency(),
$counterCurrency
),
$roundingMode
);
}
/** @return array{0: Money, 1: CurrencyPair} */
public function convertAndReturnWithCurrencyPair(Money $money, Currency $counterCurrency, int $roundingMode = Money::ROUND_HALF_UP): array
{
$pair = $this->exchange->quote(
$money->getCurrency(),
$counterCurrency
);
return [$this->convertAgainstCurrencyPair($money, $pair, $roundingMode), $pair];
}
public function convertAgainstCurrencyPair(Money $money, CurrencyPair $currencyPair, int $roundingMode = Money::ROUND_HALF_UP): Money
{
if (! $money->getCurrency()->equals($currencyPair->getBaseCurrency())) {
throw new InvalidArgumentException(
sprintf(
'Expecting to convert against base currency %s, but got %s instead',
$money->getCurrency()->getCode(),
$currencyPair->getBaseCurrency()->getCode()
)
);
}
$ratio = $currencyPair->getConversionRatio();
$baseCurrencySubunit = $this->currencies->subunitFor($currencyPair->getBaseCurrency());
$counterCurrencySubunit = $this->currencies->subunitFor($currencyPair->getCounterCurrency());
$subunitDifference = $baseCurrencySubunit - $counterCurrencySubunit;
$ratio = Number::fromString($ratio)
->base10($subunitDifference)
->__toString();
$counterValue = $money->multiply($ratio, $roundingMode);
return new Money($counterValue->getAmount(), $currencyPair->getCounterCurrency());
}
}