Add cron worker for inactive subscribers

[MAILPOET-1791]

lib/Cron/Workers/InactiveSubscribers.php

@@ -0,0 +1,47 @@
+<?php
+namespace MailPoet\Cron\Workers;
+
+use MailPoet\Cron\CronHelper;
+use MailPoet\Models\ScheduledTask;
+use MailPoet\Settings\SettingsController;
+use MailPoet\Subscribers\InactiveSubscribersController;
+
+if (!defined('ABSPATH')) exit;
+
+class InactiveSubscribers extends SimpleWorker {
+  const TASK_TYPE = 'inactive_subscribers';
+  const BATCH_SIZE = 1000;
+
+  /** @var InactiveSubscribersController */
+  private $inactive_subscribers_controller;
+
+  /** @var SettingsController */
+  private $settings;
+
+  function __construct(
+    InactiveSubscribersController $inactive_subscribers_controller,
+    SettingsController $settings,
+    $timer = false
+  ) {
+    $this->inactive_subscribers_controller = $inactive_subscribers_controller;
+    $this->settings = $settings;
+    parent::__construct($timer);
+  }
+
+
+  function processTaskStrategy(ScheduledTask $task) {
+    $days_to_inactive = (int)$this->settings->get('deactivate_subscriber_after_inactive_days');
+    if ($days_to_inactive === 0) {
+      self::schedule();
+      return true;
+    }
+    while ($this->inactive_subscribers_controller->markInactiveSubscribers($days_to_inactive, self::BATCH_SIZE) === self::BATCH_SIZE) {
+      CronHelper::enforceExecutionLimit($this->timer);
+    };
+    while ($this->inactive_subscribers_controller->markActiveSubscribers($days_to_inactive, self::BATCH_SIZE) === self::BATCH_SIZE) {
+      CronHelper::enforceExecutionLimit($this->timer);
+    };
+    self::schedule();
+    return true;
+  }
+}