<?php
/*
Plugin Name: WP Typeahead
Description: Add autocomplete search functionality to default WordPress search form
Author: c.bavota, Michal Bluma
Version: 1.0.0
Author URI: http://www.bavotasan.com/
*/
class Bavotasan_WP_Typeahead {
    public $plugin_url;
 
    public function __construct() {
        $this->plugin_url = plugin_dir_url( __FILE__ );
 
        add_action( 'wp_enqueue_scripts', array( $this, 'wp_enqueue_scripts' ) );
 
        add_action( 'wp_ajax_nopriv_ajax_search', array( $this, 'ajax_search' ) );
        add_action( 'wp_ajax_ajax_search', array( $this, 'ajax_search' ) );
    }
 
    /**
     * Enqueue Typeahead.js and the stylesheet
     *
     * @since 1.0.0
     */
    public function wp_enqueue_scripts() {
        wp_enqueue_script( 'wp_typeahead_js', $this->plugin_url . 'js/typeahead.min.js', array( 'jquery' ), '', true );
        wp_enqueue_script( 'wp_hogan_js' , $this->plugin_url . 'js/hogan.min.js', array( 'wp_typeahead_js' ), '', true );
        wp_enqueue_script( 'typeahead_wp_plugin' , $this->plugin_url . 'js/wp-typeahead.js', array( 'wp_typeahead_js', 'wp_hogan_js' ), '', true );
 
        $wp_typeahead_vars = array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) );
        wp_localize_script( 'typeahead_wp_plugin', 'wp_typeahead', $wp_typeahead_vars );
 
        wp_enqueue_style( 'wp_typeahead_css', $this->plugin_url . 'css/typeahead.css' );
    }
 
    /**
     * Ajax query for the search
     *
     * @since 1.0.0
     */
    public function ajax_search() {
        if ( isset( $_REQUEST['fn'] ) && 'get_ajax_search' == $_REQUEST['fn'] ) {
            $search_query = new WP_Query( array(
                's' => $_REQUEST['terms'],
                'posts_per_page' => 10,
                'no_found_rows' => true,
            ) );
 
            $results = array( );
            if ( $search_query->get_posts() ) {
                foreach ( $search_query->get_posts() as $the_post ) {
                    $title = get_the_title( $the_post->ID );
                    $results[] = array(
                        'value' => $title,
                        'url' => get_permalink( $the_post->ID ),
                        'tokens' => explode( ' ', $title ),
                    );
                }
            } else {
                $results[] = __( 'Sorry. No results match your search.', 'wp-typeahead' );
            }
            wp_reset_postdata();
            echo json_encode( $results );
        }
        die();
    }
}
$bavotasan_wp_typeahead = new Bavotasan_WP_Typeahead;