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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Messenger\Transport\Sender;

use Psr\Container\ContainerInterface;
use Symfony\Component\Messenger\Envelope;
use Symfony\Component\Messenger\Exception\RuntimeException;
use Symfony\Component\Messenger\Handler\HandlersLocator;

/**
 * Maps a message to a list of senders.
 *
 * @author Fabien Potencier <[email protected]>
 */
class SendersLocator implements SendersLocatorInterface
{
    private $sendersMap;
    private $sendersLocator;

    /**
     * @param array<string, list<string>> $sendersMap     An array, keyed by "type", set to an array of sender aliases
     * @param ContainerInterface          $sendersLocator Locator of senders, keyed by sender alias
     */
    public function __construct(array $sendersMap, ContainerInterface $sendersLocator)
    {
        $this->sendersMap = $sendersMap;
        $this->sendersLocator = $sendersLocator;
    }

    /**
     * {@inheritdoc}
     */
    public function getSenders(Envelope $envelope): iterable
    {
        $seen = [];

        foreach (HandlersLocator::listTypes($envelope) as $type) {
            foreach ($this->sendersMap[$type] ?? [] as $senderAlias) {
                if (!\in_array($senderAlias, $seen, true)) {
                    if (!$this->sendersLocator->has($senderAlias)) {
                        throw new RuntimeException(sprintf('Invalid senders configuration: sender "%s" is not in the senders locator.', $senderAlias));
                    }

                    $seen[] = $senderAlias;
                    $sender = $this->sendersLocator->get($senderAlias);
                    yield $senderAlias => $sender;
                }
            }
        }
    }
}