Use separate scheduler for welcome emails

[MAILPOET-2321]

lib/Newsletter/Scheduler/WelcomeScheduler.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace MailPoet\Newsletter\Scheduler;
+
+use MailPoet\Models\Newsletter;
+use MailPoet\Models\SendingQueue;
+use MailPoet\Tasks\Sending as SendingTask;
+
+class WelcomeScheduler {
+
+  function scheduleSubscriberWelcomeNotification($subscriber_id, $segments) {
+    $newsletters = Scheduler::getNewsletters(Newsletter::TYPE_WELCOME);
+    if (empty($newsletters)) return false;
+    $result = [];
+    foreach ($newsletters as $newsletter) {
+      if ($newsletter->event === 'segment' &&
+        in_array($newsletter->segment, $segments)
+      ) {
+        $result[] = $this->createWelcomeNotificationSendingTask($newsletter, $subscriber_id);
+      }
+    }
+    return $result;
+  }
+
+  function scheduleWPUserWelcomeNotification(
+    $subscriber_id,
+    $wp_user,
+    $old_user_data = false
+  ) {
+    $newsletters = Scheduler::getNewsletters(Newsletter::TYPE_WELCOME);
+    if (empty($newsletters)) return false;
+    foreach ($newsletters as $newsletter) {
+      if ($newsletter->event === 'user') {
+        if (!empty($old_user_data['roles'])) {
+          // do not schedule welcome newsletter if roles have not changed
+          $old_role = $old_user_data['roles'];
+          $new_role = $wp_user['roles'];
+          if ($newsletter->role === Scheduler::WORDPRESS_ALL_ROLES ||
+            !array_diff($old_role, $new_role)
+          ) {
+            continue;
+          }
+        }
+        if ($newsletter->role === Scheduler::WORDPRESS_ALL_ROLES ||
+          in_array($newsletter->role, $wp_user['roles'])
+        ) {
+          $this->createWelcomeNotificationSendingTask($newsletter, $subscriber_id);
+        }
+      }
+    }
+  }
+
+  function createWelcomeNotificationSendingTask($newsletter, $subscriber_id) {
+    $previously_scheduled_notification = SendingQueue::joinWithSubscribers()
+      ->where('queues.newsletter_id', $newsletter->id)
+      ->where('subscribers.subscriber_id', $subscriber_id)
+      ->findOne();
+    if (!empty($previously_scheduled_notification)) return;
+    $sending_task = SendingTask::create();
+    $sending_task->newsletter_id = $newsletter->id;
+    $sending_task->setSubscribers([$subscriber_id]);
+    $sending_task->status = SendingQueue::STATUS_SCHEDULED;
+    $sending_task->priority = SendingQueue::PRIORITY_HIGH;
+    $sending_task->scheduled_at = Scheduler::getScheduledTimeWithDelay(
+      $newsletter->afterTimeType,
+      $newsletter->afterTimeNumber
+    );
+    return $sending_task->save();
+  }
+
+}