Move dynamic segments from Premium plugin

[MAILPOET-2382]

lib/DynamicSegments/FreePluginConnectors/AddToNewslettersSegments.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace MailPoet\Premium\DynamicSegments\FreePluginConnectors;
+
+use MailPoet\Premium\DynamicSegments\Persistence\Loading\Loader;
+use MailPoet\Premium\DynamicSegments\Persistence\Loading\SubscribersCount;
+
+class AddToNewslettersSegments {
+
+  /** @var  Loader */
+  private $loader;
+
+  /** @var \MailPoet\Premium\DynamicSegments\Persistence\Loading\SubscribersCount */
+  private $subscribersCountLoader;
+
+  public function __construct(Loader $loader, SubscribersCount $subscribersCountLoader) {
+    $this->loader = $loader;
+    $this->subscribersCountLoader = $subscribersCountLoader;
+  }
+
+  /**
+   * @param array $initial_segments
+   *
+   * @return array
+   */
+  function add(array $initial_segments) {
+    $dynamic_segments = $this->getListings();
+    return array_merge($initial_segments, $dynamic_segments);
+  }
+
+  private function getListings() {
+    $dynamic_segments = $this->loader->load();
+    return $this->buildResult($dynamic_segments);
+  }
+
+  private function buildResult($dynamic_segments) {
+    $result = [];
+    foreach ($dynamic_segments as $dynamic_segment) {
+      $result[] = [
+        'id' => $dynamic_segment->id,
+        'name' => $dynamic_segment->name,
+        'subscribers' => $this->subscribersCountLoader->getSubscribersCount($dynamic_segment),
+        'deleted_at' => $dynamic_segment->deleted_at,
+      ];
+    }
+    return $result;
+  }
+}