<?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\Mailer\Bridge\MailPace\Transport;

use Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\Mailer\Envelope;
use Symfony\Component\Mailer\Exception\HttpTransportException;
use Symfony\Component\Mailer\Header\TagHeader;
use Symfony\Component\Mailer\SentMessage;
use Symfony\Component\Mailer\Transport\AbstractApiTransport;
use Symfony\Component\Mime\Email;
use Symfony\Contracts\HttpClient\Exception\DecodingExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use Symfony\Contracts\HttpClient\ResponseInterface;

/**
 * @author Paul Oms <support@mailpace.com>
 */
final class MailPaceApiTransport extends AbstractApiTransport
{
    private const HOST = 'app.mailpace.com/api/v1';

    private string $key;

    public function __construct(string $key, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null, LoggerInterface $logger = null)
    {
        $this->key = $key;

        parent::__construct($client, $dispatcher, $logger);
    }

    public function __toString(): string
    {
        return sprintf('mailpace+api://%s', $this->getEndpoint());
    }

    protected function doSendApi(SentMessage $sentMessage, Email $email, Envelope $envelope): ResponseInterface
    {
        $response = $this->client->request('POST', 'https://'.$this->getEndpoint().'/send', [
            'headers' => [
                'Accept' => 'application/json',
                'MailPace-Server-Token' => $this->key,
                'Content-Type' => 'application/json',
                'User-Agent' => 'MailPace Symfony Mailer',
            ],
            'json' => $this->getPayload($email, $envelope),
        ]);

        try {
            $statusCode = $response->getStatusCode();
            $result = $response->toArray(false);
        } catch (DecodingExceptionInterface $e) {
            throw new HttpTransportException('Unable to send an email: '.$response->getContent(false).sprintf(' (code %d).', $statusCode), $response, 0, $e);
        } catch (TransportExceptionInterface $e) {
            throw new HttpTransportException('Could not reach the remote MailPace endpoint.', $response, 0, $e);
        }

        if (200 !== $statusCode) {
            $errorMessage = 'Unable to send an email: ';
            if (isset($result['error'])) {
                $errorMessage .= $result['error'];
            } elseif (isset($result['errors'])) {
                $errors = [];
                foreach ($result['errors'] as $key => $val) {
                    $errors[] = $key.': '.implode(' & ', $val);
                }
                $errorMessage .= implode('; ', $errors);
            } else {
                $errorMessage .= 'unknown error';
            }
            $errorMessage .= sprintf(' (code %d).', $statusCode);
            throw new HttpTransportException($errorMessage, $response);
        }

        $sentMessage->setMessageId($result['id']);

        return $response;
    }

    private function getPayload(Email $email, Envelope $envelope): array
    {
        $payload = [
            'from' => $envelope->getSender()->toString(),
            'to' => implode(',', $this->stringifyAddresses($this->getRecipients($email, $envelope))),
            'cc' => implode(',', $this->stringifyAddresses($email->getCc())),
            'bcc' => implode(',', $this->stringifyAddresses($email->getBcc())),
            'replyto' => implode(',', $this->stringifyAddresses($email->getReplyTo())),
            'subject' => $email->getSubject(),
            'textbody' => $email->getTextBody(),
            'htmlbody' => $email->getHtmlBody(),
            'attachments' => $this->getAttachments($email),
            'tags' => [],
        ];

        $headersToBypass = ['from', 'to', 'cc', 'bcc', 'subject', 'content-type', 'sender', 'reply-to'];

        foreach ($email->getHeaders()->all() as $name => $header) {
            if (\in_array($name, $headersToBypass, true)) {
                continue;
            }

            if ($header instanceof TagHeader) {
                $payload['tags'][] = $header->getValue();
                continue;
            }

            $payload['Headers'][] = [
                'Name' => $header->getName(),
                'Value' => $header->getBodyAsString(),
            ];
        }

        return $payload;
    }

    private function getAttachments(Email $email): array
    {
        $attachments = [];
        foreach ($email->getAttachments() as $attachment) {
            $headers = $attachment->getPreparedHeaders();
            $filename = $headers->getHeaderParameter('Content-Disposition', 'filename');
            $disposition = $headers->getHeaderBody('Content-Disposition');

            $att = [
                'name' => $filename,
                'content' => $attachment->bodyToString(),
                'content_type' => $headers->get('Content-Type')->getBody(),
            ];

            if ('inline' === $disposition) {
                $att['cid'] = 'cid:'.$filename;
            }

            $attachments[] = $att;
        }

        return $attachments;
    }

    private function getEndpoint(): ?string
    {
        return ($this->host ?: self::HOST).($this->port ? ':'.$this->port : '');
    }
}
