Load subscribers from dynamic segments

[PREMIUM-38]

lib/Segments/SubscribersListings.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace MailPoet\Segments;
+
+use MailPoet\Listing\Handler;
+use MailPoet\Models\Segment;
+use MailPoet\WP\Hooks;
+
+class SubscribersListings {
+
+  function getListingsInSegment($data) {
+    if(!isset($data['filter']['segment'])) {
+      throw new \InvalidArgumentException('Missing segment id');
+    }
+    $segment = Segment::find_one($data['filter']['segment']);
+    if($segment) {
+      $segment = $segment->asArray();
+    }
+    return $this->getListings($segment, $data);
+
+  }
+
+  private function getListings($segment, $data) {
+    if(!$segment || $segment['type'] === Segment::TYPE_DEFAULT || $segment['type'] === Segment::TYPE_WP_USERS) {
+      $listing = new Handler('\MailPoet\Models\Subscriber', $data);
+
+      return $listing_data = $listing->get();
+    }
+    $handlers = Hooks::applyFilters('mailpoet_get_subscribers_listings_in_segment_handlers', array());
+    foreach($handlers as $handler) {
+      $listings = $handler->get($segment, $data);
+      if($listings) {
+        return $listings;
+      }
+    }
+    throw new \InvalidArgumentException('No handler found for segment');
+  }
+
+}