public static FB_Attachment graphql_to_extensible_attachment(JToken data)
        {
            var story = data.get("story_attachment");

            if (story == null)
            {
                return(null);
            }

            var target = story.get("target");

            if (target == null)
            {
                return(new FB_UnsentMessage(uid: data.get("legacy_attachment_id")?.Value <string>()));
            }

            var _type = target.get("__typename")?.Value <string>();

            if (_type == "MessageLocation")
            {
                return(FB_LocationAttachment._from_graphql(story));
            }
            else if (_type == "MessageLiveLocation")
            {
                return(FB_LiveLocationAttachment._from_graphql(story));
            }
            else if (new string[] { "ExternalUrl", "Story" }.Contains(_type))
            {
                return(FB_ShareAttachment._from_graphql(story));
            }

            return(null);
        }
        public static FB_LocationAttachment _from_graphql(JToken data)
        {
            var    url = data.get("url")?.Value <string>();
            var    address = Utils.get_url_parameter(Utils.get_url_parameter(url, "u"), "where1");
            double latitude = 0, longitude = 0;

            try
            {
                var split = address.Split(new[] { ", " }, StringSplitOptions.None);
                latitude  = Double.Parse(split[0]);
                longitude = Double.Parse(split[1]);
                address   = null;
            }
            catch (Exception)
            {
            }

            var rtn = new FB_LocationAttachment(
                uid: data.get("deduplication_key")?.Value <string>(),
                latitude: latitude,
                longitude: longitude,
                address: address);

            var media = data.get("media");

            if (media != null && media.get("image") != null)
            {
                var image = media.get("image");
                rtn.image_url    = image?.get("uri")?.Value <string>();
                rtn.image_width  = image?.get("width")?.Value <int>() ?? 0;
                rtn.image_height = image?.get("height")?.Value <int>() ?? 0;
            }

            rtn.url = url;

            return(rtn);
        }