<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * 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;
use Symfony\Component\Messenger\Stamp\TransportNamesStamp;

/**
 * Maps a message to a list of senders.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class SendersLocator implements SendersLocatorInterface
{
    private array $sendersMap;
    private ContainerInterface $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;
    }

    public function getSenders(Envelope $envelope): iterable
    {
        if ($envelope->all(TransportNamesStamp::class)) {
            foreach ($envelope->last(TransportNamesStamp::class)->getTransportNames() as $senderAlias) {
                yield from $this->getSenderFromAlias($senderAlias);
            }

            return;
        }

        $seen = [];

        foreach (HandlersLocator::listTypes($envelope) as $type) {
            if (str_ends_with($type, '*') && $seen) {
                // the '*' acts as a fallback, if other senders already matched
                // with previous types, skip the senders bound to the fallback
                continue;
            }

            foreach ($this->sendersMap[$type] ?? [] as $senderAlias) {
                if (!\in_array($senderAlias, $seen, true)) {
                    $seen[] = $senderAlias;

                    yield from $this->getSenderFromAlias($senderAlias);
                }
            }
        }
    }

    private function getSenderFromAlias(string $senderAlias): iterable
    {
        if (!$this->sendersLocator->has($senderAlias)) {
            throw new RuntimeException(\sprintf('Invalid senders configuration: sender "%s" is not in the senders locator.', $senderAlias));
        }

        yield $senderAlias => $this->sendersLocator->get($senderAlias);
    }
}
