<?php

declare(strict_types=1);

namespace Evomedien\Vitec\Forms\Delivery;

use TYPO3\CMS\Core\Mail\MailMessage;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Sends the submission as a plain-text mail to the FlexForm-configured
 * recipient(s). Sender = system default (MAIL settings); reply-to = the
 * submitter's email when present.
 */
final class EmailDelivery implements DeliveryInterface
{
    public function deliver(string $formKey, array $payload, array $settings): void
    {
        $recipients = GeneralUtility::trimExplode(',', (string)($settings['recipient'] ?? ''), true);
        if ($recipients === []) {
            throw new \RuntimeException('No recipient configured in the form plugin (FlexForm "Recipient").');
        }

        $subject = trim((string)($settings['subject'] ?? ''));
        if ($subject === '') {
            $subject = 'VITEC website form: ' . $formKey;
        }

        $lines = [];
        foreach ($payload as $field => $value) {
            $lines[] = str_pad($field . ':', 16) . $value;
        }

        $mail = GeneralUtility::makeInstance(MailMessage::class);
        $mail->to(...$recipients)
            ->subject($subject)
            ->text("Form: $formKey\n\n" . implode("\n", $lines));

        $submitterEmail = trim((string)($payload['email'] ?? ''));
        if ($submitterEmail !== '' && filter_var($submitterEmail, FILTER_VALIDATE_EMAIL)) {
            $mail->replyTo($submitterEmail);
        }

        if (!$mail->send()) {
            throw new \RuntimeException('MailMessage::send() reported failure.');
        }
    }
}