<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit;
} // Exit if accessed directly
if ( ! trait_exists( 'CUSTOMFIELD_SELECT' ) ) {

    trait CUSTOMFIELD_SELECT {

        public function set_custom_field_ajax() {
            $handle = 'custom_field_ajax';
            wp_register_script( $handle, APOP_PLUGIN_URL . 'js/custom_field.js', [ 'jquery' ], '', true );
            $localize = [
                'ajax_url' => admin_url( 'admin-ajax.php' ),
                'action'   => 'set_custom_field',
            ];
            wp_localize_script( $handle, 'localize', $localize );
            wp_enqueue_script( $handle );
        }

        public function set_custom_field() {
            $param = filter_input( INPUT_GET, 'param', FILTER_DEFAULT );
            echo json_encode( $this->get_custom_fields_by_param( $param ) );
            die();
        }

        private function get_custom_fields_by_param( $param ) {
            global $wpdb;
            $stmnt = "SELECT DISTINCT meta_key AS value, meta_key as label FROM $wpdb->postmeta WHERE meta_key LIKE %s AND meta_key NOT LIKE %s";

            return $wpdb->get_results( $wpdb->prepare( $stmnt, $wpdb->esc_like( $param ) . '%', $wpdb->esc_like( '_%' ) ) );
        }

    }
}