Move data selection to a reusable service

[MAILPOET-2553]

lib/WP/AutocompletePostListLoader.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace MailPoet\WP;
+
+/**
+ * Class AutocompletePostListLoader is used to load data for the frontend autocomplete
+ */
+class AutocompletePostListLoader {
+  /** @var Functions */
+  private $wp;
+
+  public function __construct(Functions $wp) {
+    $this->wp = $wp;
+  }
+
+  public function getProducts() {
+    $products = $this->wp->getResultsFromWpDb(
+      "SELECT `ID`, `post_title` FROM {$this->wp->getWPTableName('posts')} WHERE `post_type` = %s ORDER BY `post_title` ASC;",
+      'product'
+    );
+    return $this->formatPosts($products);
+  }
+
+  public function getWooCommerceCategories() {
+    return $this->formatTerms($this->wp->getCategories(['taxonomy' => 'product_cat', 'orderby' => 'name']));
+  }
+
+  private function formatPosts($posts) {
+    if (empty($posts)) return [];
+    $result = [];
+    foreach ($posts as $post) {
+      $result[] = [
+        'id' => $post->ID,
+        'name' => $post->post_title,// phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+      ];
+    }
+    return $result;
+  }
+
+  private function formatTerms($terms) {
+    if (empty($terms)) return [];
+    if (!is_array($terms)) return []; // there can be instance of WP_Error instead of list of terms if woo commerce is not active
+    $result = [];
+    foreach ($terms as $term) {
+      $result[] = [
+        'id' => $term->term_id,// phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+        'name' => $term->name,
+      ];
+    }
+    return $result;
+  }
+}