Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/Cron/Workers/StatsNotifications/NewsletterLinkRepository.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace MailPoet\Cron\Workers\StatsNotifications;
+
+use MailPoet\Doctrine\Repository;
+use MailPoet\Entities\NewsletterLinkEntity;
+use MailPoet\Entities\StatisticsClickEntity;
+use MailPoetVendor\Doctrine\DBAL\Driver\Statement;
+
+/**
+ * @extends Repository<NewsletterLinkEntity>
+ */
+class NewsletterLinkRepository extends Repository {
+  protected function getEntityClassName() {
+    return NewsletterLinkEntity::class;
+  }
+
+  /**
+   * @param int $newsletterId
+   * @return NewsletterLinkEntity|null
+   */
+  public function findTopLinkForNewsletter($newsletterId) {
+    $statisticsClicksTable = $this->entityManager->getClassMetadata(StatisticsClickEntity::class)->getTableName();
+    $topIdQuery = $this->entityManager->getConnection()->createQueryBuilder()
+      ->select('c.link_id')
+      ->addSelect('count(c.id) AS counter')
+      ->from($statisticsClicksTable, 'c')
+      ->where('c.newsletter_id = :newsletterId')
+      ->setParameter('newsletterId', $newsletterId)
+      ->groupBy('c.link_id')
+      ->orderBy('counter', 'desc')
+      ->setMaxResults(1)
+      ->execute();
+    if (!$topIdQuery instanceof Statement) {
+      return null;
+    }
+    $topId = $topIdQuery->fetch();
+    if (is_array($topId) && isset($topId['link_id'])) {
+      return $this->findOneById((int)$topId['link_id']);
+    }
+    return null;
+  }
+}