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<?php declare(strict_types=1); namespace Money\Exchange; use Money\Currencies; use Money\Currency; use Money\CurrencyPair; use Money\Exception\UnresolvableCurrencyPairException; use Money\Exchange; use Money\Money; use SplQueue; use function array_reduce; use function array_reverse; /** * Provides a way to get an exchange rate through a minimal set of intermediate conversions. */ final class IndirectExchange implements Exchange { public function __construct(private readonly Exchange $exchange, private readonly Currencies $currencies) { } public function quote(Currency $baseCurrency, Currency $counterCurrency): CurrencyPair { try { return $this->exchange->quote($baseCurrency, $counterCurrency); } catch (UnresolvableCurrencyPairException) { $rate = array_reduce( $this->getConversions($baseCurrency, $counterCurrency), /** * @psalm-param numeric-string $carry * * @psalm-return numeric-string */ static function (string $carry, CurrencyPair $pair) { $calculator = Money::getCalculator(); return $calculator::multiply($carry, $pair->getConversionRatio()); }, '1.0' ); return new CurrencyPair($baseCurrency, $counterCurrency, $rate); } } /** * @return CurrencyPair[] * * @throws UnresolvableCurrencyPairException */ private function getConversions(Currency $baseCurrency, Currency $counterCurrency): array { $startNode = new IndirectExchangeQueuedItem($baseCurrency); $startNode->discovered = true; /** @psalm-var array<non-empty-string, IndirectExchangeQueuedItem> $nodes */ $nodes = [$baseCurrency->getCode() => $startNode]; /** @psam-var SplQueue<IndirectExchangeQueuedItem> $frontier */ $frontier = new SplQueue(); $frontier->enqueue($startNode); while ($frontier->count()) { /** @psalm-var IndirectExchangeQueuedItem $currentNode */ $currentNode = $frontier->dequeue(); $currentCurrency = $currentNode->currency; if ($currentCurrency->equals($counterCurrency)) { return $this->reconstructConversionChain($nodes, $currentNode); } foreach ($this->currencies as $candidateCurrency) { if (! isset($nodes[$candidateCurrency->getCode()])) { $nodes[$candidateCurrency->getCode()] = new IndirectExchangeQueuedItem($candidateCurrency); } $node = $nodes[$candidateCurrency->getCode()]; if ($node->discovered) { continue; } try { // Check if the candidate is a neighbor. This will throw an exception if it isn't. $this->exchange->quote($currentCurrency, $candidateCurrency); $node->discovered = true; $node->parent = $currentNode; $frontier->enqueue($node); } catch (UnresolvableCurrencyPairException) { // Not a neighbor. Move on. } } } throw UnresolvableCurrencyPairException::createFromCurrencies($baseCurrency, $counterCurrency); } /** * @psalm-param array<non-empty-string, IndirectExchangeQueuedItem> $currencies * * @return CurrencyPair[] * @psalm-return list<CurrencyPair> */ private function reconstructConversionChain(array $currencies, IndirectExchangeQueuedItem $goalNode): array { $current = $goalNode; $conversions = []; while ($current->parent) { $previous = $currencies[$current->parent->currency->getCode()]; $conversions[] = $this->exchange->quote($previous->currency, $current->currency); $current = $previous; } return array_reverse($conversions); } }
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