<?php

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Class WPDesk_WooCommerce_DHL_Select_Parcels_Via_Ajax
 */
class WPDesk_WooCommerce_DHL_Select_Parcels_Via_Ajax {

	/** @var WPDesk_WooCommerce_DHL $shipping_method */
	private $shipping_method = null;

	/** @var array */
	private $parcels;

	/** @var array */
	private $requests;

	/** @var string */
	private $nonce_name;

	/** @var int  */
	const MIN_LENGTH = 3;

	/**
	 * WPDesk_WooCommerce_DHL_Select_Machines_Via_Ajax constructor.
	 *
	 * @param WPDesk_WooCommerce_DHL $shipping_method
	 * @param string $nonce_name
	 */
	public function __construct( WPDesk_WooCommerce_DHL $shipping_method, $nonce_name ) {
		$this->shipping_method = $shipping_method;
		$this->nonce_name = $nonce_name;
	}

	/**
	 * Fires hooks.
	 *
	 */
	public function hooks() {
		add_action( 'wp_ajax_dhl_search_machines_via_ajax', array( $this, 'wp_ajax_dhl_search_parcels_via_ajax') );
		add_action( 'wp_ajax_nopriv_dhl_search_machines_via_ajax', array( $this, 'wp_ajax_dhl_search_parcels_via_ajax') );
	}

	/**
	 * Execute AJAX request
	 *
	 * @return void
	 */
	public function wp_ajax_dhl_search_parcels_via_ajax() {
		check_ajax_referer( 'woocommerce-dhl', 'security' );
				
		$all_parcels    = array();
		$this->requests = new WPDesk_WooCommerce_DHL_Ajax_Request( $this->nonce_name, $_POST );
		$this->parcels  = $this->get_list_of_parcels();

        $sap = $this->requests->getCode();
		$all_parcels['items'] = $this->get_parcel_by_city();
        if ( ! empty( $sap ) && isset( $this->parcels[ $sap ] ) ) {
            wp_send_json( array( 'id' => $sap, 'text' => $this->parcels[ $sap ] ) );
        }
		wp_send_json( $all_parcels );
	}


	/**
	 * Append parcels.
	 *
	 * @param array $parcels Parcels.
	 * @param array $parcels_to_append Parcels to append.
	 *
	 * @return array
	 */
	private function append_parcels( array $parcels, array $parcels_to_append ) {
		foreach ( $parcels_to_append as $key => $value ) {
			$parcels[ $key ] = $value;
		}
		return $parcels;
	}


	/**
	 * Return a list of parcels
	 *
	 * @return array
	 */
	public function get_list_of_parcels() {
		$list_of_parcels = $this->shipping_method->getListOfParcels();
		return $this->append_parcels(
			$this->append_parcels( array(), isset( $list_of_parcels['dhl_parcelshop_nearest'] ) ? $list_of_parcels['dhl_parcelshop_nearest'] : array() ),
			isset( $list_of_parcels['dhl_parcelshop_other'] ) ? $list_of_parcels['dhl_parcelshop_other'] : array()
		);
	}

	/**
	 * Return a list of parcels for city request
	 *
	 * @return array
	 */
	public function get_parcel_by_city() {
		if ( strlen( $this->requests->getCity() ) >= self::MIN_LENGTH ) {
			$items   = array();

			$phrase = explode( ' ', $this->requests->getCity() );
			$phrase = str_replace(',', '', $phrase );
			$pattern = '/^.+(' . implode( ').+(', $phrase ) . ').+/iu';
			$results = preg_grep( $pattern, $this->parcels );
			foreach ( $results as $key => $item ) {
				$items[] = array(
					'id'   => $key,
					'text' => $item,
				);
			}

			return $items;
		}

		return array();
	}

}