<?php
/**
 * NOTICE OF LICENSE
 *
 * This file is licenced under the Software License Agreement.
 * With the purchase or the installation of the software in your application
 * you accept the licence agreement.
 *
 * You must not modify, adapt or create derivative works of this source code
 *
 * @author    Musaffar Patel
 * @copyright 2016-2020 Musaffar Patel
 * @license   LICENSE.txt
 */

class DDWMapsGoogleHelper extends DDWMapsHelper
{

    /** @var string */
    private $url_distance_matrix = 'https://maps.googleapis.com/maps/api/distancematrix/json?units=imperial';

    /** @var string */
    private $api_key = '';

    public function __construct()
    {
        $this->api_key = DDWMapsHelper::getApiKey();
    }

    /**
     * Get Address from postcode and country
     * @param $postcode
     * @param $country
     */
    public function getAddress($postcode, $country)
    {
        $postcode = urlencode($postcode);
        $url = $this->url_distance_matrix . "&origins=" . $postcode . "," . $country . "&destinations=" . $postcode . "," . $country . "&key=" . $this->api_key;
        $result = json_decode(Tools::file_get_contents($url));

        if (!empty($result->origin_addresses[0])) {
            return $result->origin_addresses[0];
        } else {
            return '';
        }
    }

    /**
     * Construct the url to perform the API Request
     * @param $source_address
     * @param array $destination_addresses
     */
    private function performRequest($source_address, array $destination_addresses)
    {
        $query_customer = $source_address['postal_code'] . ',' . $source_address['country'];

        $query_carriers = '';

        foreach ($destination_addresses as $destination_address) {
            $query_carriers .= $destination_address['postal_code'] . ',' . $destination_address['country'] . '|';
        }

        $query_carriers = trim($query_carriers, '|');

        $url = $this->url_distance_matrix . '&origins=' . urlencode($query_customer) . '&destinations=' . urlencode($query_carriers) . '&key=' . $this->api_key;
        return json_decode(Tools::file_get_contents($url));
    }

    private function returnDistances($result)
    {
    }

    /**
     * Get Distance between a source address and destination addresses
     * @param $source_address
     * @param array $destination_addresses
     */
    public function getDistancesByPostCodes($source_address, array $destination_addresses)
    {
        $carrier_distances = array();
        $result = $this->performRequest($source_address, $destination_addresses);

        if (empty($result->rows[0])) {
            return array();
        }

        // add distances to the wch carrier
        $index = 0;
        foreach ($result->rows[0]->elements as $row) {
            if (empty($row->distance)) {
                $destination_addresses[$index]['distance'] = 0;
            } else {
                $destination_addresses[$index]['distance'] = $row->distance->value / 1000; // in Kilometres
            }
            $index++;
        }

        foreach ($destination_addresses as $destination_address) {
            $carrier_distances[$destination_address['id_carrier']] = $destination_address;
        }
        return $carrier_distances;
    }
}