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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\Bridge\Monolog\Handler;

use Monolog\Handler\SwiftMailerHandler as BaseSwiftMailerHandler;
use Symfony\Component\Console\Event\ConsoleTerminateEvent;
use Symfony\Component\HttpKernel\Event\TerminateEvent;

trigger_deprecation('symfony/monolog-bridge', '5.4', '"%s" is deprecated and will be removed in 6.0.', SwiftMailerHandler::class);

/**
 * Extended SwiftMailerHandler that flushes mail queue if necessary.
 *
 * @author Philipp Kräutli <[email protected]>
 *
 * @final
 *
 * @deprecated since Symfony 5.4
 */
class SwiftMailerHandler extends BaseSwiftMailerHandler
{
    protected $transport;

    protected $instantFlush = false;

    public function setTransport(\Swift_Transport $transport)
    {
        $this->transport = $transport;
    }

    /**
     * After the kernel has been terminated we will always flush messages.
     */
    public function onKernelTerminate(TerminateEvent $event)
    {
        $this->instantFlush = true;
    }

    /**
     * After the CLI application has been terminated we will always flush messages.
     */
    public function onCliTerminate(ConsoleTerminateEvent $event)
    {
        $this->instantFlush = true;
    }

    /**
     * {@inheritdoc}
     */
    protected function send($content, array $records): void
    {
        parent::send($content, $records);

        if ($this->instantFlush) {
            $this->flushMemorySpool();
        }
    }

    /**
     * {@inheritdoc}
     */
    public function reset(): void
    {
        $this->flushMemorySpool();
    }

    /**
     * Flushes the mail queue if a memory spool is used.
     */
    private function flushMemorySpool()
    {
        $mailerTransport = $this->mailer->getTransport();
        if (!$mailerTransport instanceof \Swift_Transport_SpoolTransport) {
            return;
        }

        $spool = $mailerTransport->getSpool();
        if (!$spool instanceof \Swift_MemorySpool) {
            return;
        }

        if (null === $this->transport) {
            throw new \Exception('No transport available to flush mail queue.');
        }

        $spool->flushQueue($this->transport);
    }
}