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Edit File: AutocompletePostListLoader.php

<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing

namespace MailPoet\WP;

if (!defined('ABSPATH')) exit;

/**
 * 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() {
    global $wpdb;

$products = $wpdb->get_results($wpdb->prepare(
      "SELECT `ID`, `post_title` FROM {$wpdb->posts} WHERE `post_type` = %s ORDER BY `post_title` ASC;",
      'product'
    ));
    return $this->formatPosts($products);
  }

public function getMembershipPlans() {
    global $wpdb;
    $products = $wpdb->get_results($wpdb->prepare(
      "SELECT `ID`, `post_title` FROM {$wpdb->posts} WHERE `post_type` = %s AND `post_status` = 'publish' ORDER BY `post_title` ASC;",
      'wc_membership_plan'
    ));
    return $this->formatPosts($products);
  }

public function getSubscriptionProducts() {
    global $wpdb;
    $products = $wpdb->get_results($wpdb->prepare(
      "SELECT `ID`, `post_title` FROM {$wpdb->posts} AS p
        INNER JOIN {$wpdb->term_relationships} AS trel ON trel.object_id = p.id
        INNER JOIN {$wpdb->term_taxonomy} AS ttax ON ttax.term_taxonomy_id = trel.term_taxonomy_id
        INNER JOIN {$wpdb->terms} AS t ON ttax.term_id = t.term_id AND t.slug IN ('subscription', 'variable-subscription')
        WHERE `p`.`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']));
  }

public function getPosts() {
    global $wpdb;
    $optionList = $wpdb->get_results('SELECT ID, post_title FROM ' . $wpdb->posts . " WHERE post_type='post' ORDER BY `post_title` ASC;");
    return $this->formatPosts($optionList);
  }

public function getPages() {
    global $wpdb;
    $optionList = $wpdb->get_results('SELECT ID, post_title FROM ' . $wpdb->posts . " WHERE post_type='page' ORDER BY `post_title` ASC;");
    return $this->formatPosts($optionList);
  }

public function getWooCommerceTags() {
    return $this->formatTerms($this->wp->getTerms('product_tag'));
  }

public function getCategories() {
    return $this->formatTerms($this->wp->getCategories());
  }

public function getTags() {
    return $this->formatTerms($this->wp->getTags());
  }

private function formatPosts($posts) {
    if (empty($posts)) return [];
    $result = [];
    foreach ($posts as $post) {
      $result[] = [
        'id' => (string)$post->ID,
        'name' => $post->post_title,// phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
      ];
    }
    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) {
      $result[] = [
        'id' => (string)$term->term_id,// phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
        'name' => $term->name,
      ];
    }
    return $result;
  }
}

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