Use Newsletter Link Entity in Stats Notifications

[MAILPOET-2439]

lib/Cron/Workers/StatsNotifications/NewsletterLinkRepository.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace MailPoet\Cron\Workers\StatsNotifications;
+
+use MailPoet\Doctrine\Repository;
+use MailPoet\Entities\NewsletterLinkEntity;
+
+class NewsletterLinkRepository extends Repository {
+  protected function getEntityClassName() {
+    return NewsletterLinkEntity::class;
+  }
+
+  /**
+   * @param int $newsletter_id
+   * @return NewsletterLinkEntity
+   * @throws \MailPoetVendor\Doctrine\ORM\NoResultException
+   * @throws \MailPoetVendor\Doctrine\ORM\NonUniqueResultException
+   */
+  public function findTopLinkForNewsletter($newsletter_id) {
+    return $this->doctrine_repository
+      ->createQueryBuilder('nlr')
+      ->join('nlr.clicks', 'c')
+      ->addSelect('COUNT(c.id) AS HIDDEN counter')
+      ->where('nlr.newsletter_id = :newsletterId')
+      ->setParameter('newsletterId', $newsletter_id)
+      ->groupBy('nlr.id')
+      ->orderBy('counter', 'desc')
+      ->setMaxResults(1)
+      ->getQuery()
+      ->getSingleResult();
+  }
+
+}