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Edit File: EmailEditorPreviewEmail.php

<?php declare(strict_types = 1);

namespace MailPoet\EmailEditor\Integrations\MailPoet;

if (!defined('ABSPATH')) exit;

use MailPoet\Entities\NewsletterEntity;
use MailPoet\Newsletter\NewslettersRepository;
use MailPoet\Newsletter\Preview\SendPreviewController;

class EmailEditorPreviewEmail {
  private NewslettersRepository $newslettersRepository;

private SendPreviewController $sendPreviewController;

public function __construct(
    NewslettersRepository $newslettersRepository,
    SendPreviewController $sendPreviewController
  ) {
    $this->newslettersRepository = $newslettersRepository;
    $this->sendPreviewController = $sendPreviewController;
  }

/**
   * Sends preview email
   * @param bool|array $postData
   * @return bool|array
   * @throws \Exception
   */
  public function sendPreviewEmail($postData) {
    if (is_bool($postData) || !isset($postData['postId']) || get_post_type((int)$postData['postId']) !== EmailEditor::MAILPOET_EMAIL_POST_TYPE) {
      return $postData;
    }

$this->validateData($postData);

$newsletter = $this->fetchNewsletter($postData);
    $subscriber = $postData['email'];

$this->sendPreviewController->sendPreview($newsletter, $subscriber);

return true;
  }

private function validateData($data) {
    if (empty($data['email']) || empty($data['postId'])) {
      throw new \InvalidArgumentException(esc_html__('Missing required data', 'mailpoet'));
    }

if (!is_email($data['email'])) {
      throw new \InvalidArgumentException(esc_html__('Invalid email address', 'mailpoet'));
    }
  }

/**
   * @param array $postData
   * @return NewsletterEntity
   * @throws \Exception
   */
  private function fetchNewsletter($postData): NewsletterEntity {
    $newsletter = $this->newslettersRepository->findOneBy(['wpPost' => (int)$postData['postId']]);

if (!$newsletter instanceof NewsletterEntity) {
      throw new \Exception(esc_html__('This email does not exist.', 'mailpoet'));
    }

return $newsletter;
  }
}

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