Add sending queue status to help page

[MAILPOET-1459]

lib/Tasks/State.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace MailPoet\Tasks;
+
+
+use MailPoet\Models\ScheduledTask;
+
+class State
+{
+  /**
+   * @return array
+   */
+  function getCountsPerStatus() {
+    $stats = [
+      ScheduledTask::STATUS_COMPLETED => 0,
+      ScheduledTask::STATUS_PAUSED => 0,
+      ScheduledTask::STATUS_SCHEDULED => 0,
+      ScheduledTask::VIRTUAL_STATUS_RUNNING => 0,
+    ];
+    $counts = ScheduledTask::rawQuery(
+      "SELECT COUNT(*) as value, status
+       FROM `" . ScheduledTask::$_table . "`
+       WHERE deleted_at IS NULL AND `type` = 'sending'
+       GROUP BY status;"
+    )->findMany();
+    foreach($counts as $count) {
+      if($count->status === null) {
+        $stats[ScheduledTask::VIRTUAL_STATUS_RUNNING] = (int)$count->value;
+        continue;
+      }
+      $stats[$count->status] = (int)$count->value;
+    }
+    return $stats;
+  }
+}