private function saveCoordinates(Address $address) : void
    {
        $preparedAddress = str_replace(' ', '+', $address->address . '+' . $address->postcode . '+' . $address->town);
        $geocode = file_get_contents('https://maps.googleapis.com/maps/api/geocode/json?address=' . $preparedAddress . '&key=' . env('GOOGLE_API_KEY'));
        $output = json_decode($geocode);

        try {
            $address->lat = $output->results[0]->geometry->location->lat;
            $address->lng = $output->results[0]->geometry->location->lng;
        } catch (\Exception $e) {
            $address->lat = null;
            $address->lng = null;

            Log::debug('error in counting distance: ' . json_encode($e));
        }

        $address->save();
    }

    private function saveDistance(Address $address) : void
    {
        $lat1 = $address->lat;
        $lon1 = $address->lng;
        $lat2 = config('addresses.lat');
        $lon2 = config('addresses.lng');

        if (($lat1 == $lat2) && ($lon1 == $lon2)) {
            $address->distance = 0;
            $address->save();
        } else {
            $theta = $lon1 - $lon2;
            $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
            $dist = acos($dist);
            $dist = rad2deg($dist);
            $km = $dist * config('addresses.const');

            $address->distance = $km;
            $address->save();
        }
    }