<?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\Notifier\Message;

use Symfony\Bridge\Twig\Mime\NotificationEmail;
use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mime\Email;
use Symfony\Component\Mime\RawMessage;
use Symfony\Component\Notifier\Exception\InvalidArgumentException;
use Symfony\Component\Notifier\Exception\LogicException;
use Symfony\Component\Notifier\Notification\Notification;
use Symfony\Component\Notifier\Recipient\EmailRecipientInterface;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
final class EmailMessage implements MessageInterface
{
    private $message;
    private $envelope;

    public function __construct(RawMessage $message, Envelope $envelope = null)
    {
        $this->message = $message;
        $this->envelope = $envelope;
    }

    public static function fromNotification(Notification $notification, EmailRecipientInterface $recipient): self
    {
        if ('' === $recipient->getEmail()) {
            throw new InvalidArgumentException(sprintf('"%s" needs an email, it cannot be empty.', __CLASS__));
        }

        if (!class_exists(NotificationEmail::class)) {
            $email = (new Email())
                ->to($recipient->getEmail())
                ->subject($notification->getSubject())
                ->text($notification->getContent() ?: $notification->getSubject())
            ;
        } else {
            $email = (new NotificationEmail())
                ->to($recipient->getEmail())
                ->subject($notification->getSubject())
                ->content($notification->getContent() ?: $notification->getSubject())
                ->importance($notification->getImportance())
            ;

            if ($exception = $notification->getException()) {
                $email->exception($exception);
            }
        }

        return new self($email);
    }

    public function getMessage(): RawMessage
    {
        return $this->message;
    }

    public function getEnvelope(): ?Envelope
    {
        return $this->envelope;
    }

    /**
     * @return $this
     */
    public function envelope(Envelope $envelope): self
    {
        $this->envelope = $envelope;

        return $this;
    }

    public function getSubject(): string
    {
        return '';
    }

    public function getRecipientId(): ?string
    {
        return null;
    }

    public function getOptions(): ?MessageOptionsInterface
    {
        return null;
    }

    /**
     * @return $this
     */
    public function transport(?string $transport): self
    {
        if (!$this->message instanceof Email) {
            throw new LogicException('Cannot set a Transport on a RawMessage instance.');
        }
        if (null === $transport) {
            return $this;
        }

        $this->message->getHeaders()->addTextHeader('X-Transport', $transport);

        return $this;
    }

    public function getTransport(): ?string
    {
        return $this->message instanceof Email ? $this->message->getHeaders()->getHeaderBody('X-Transport') : null;
    }
}
