FaceBook

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Facebook;

namespace fbBot
{
   public class FB
    {
       public static FacebookClient client = null;
       public static dynamic me;
       public static FacebookClient GetClient()
       {
           if (Program.ongoingAuth)
           {
               return null;
           }
           if (client!=null)
           {
               return client;
           }

           try
           {
               client = new FacebookClient(Data.Get("token"));
               me=client.Get("me/");
               
           }
           catch (Exception)
           {
               
               Program.ongoingAuth = true;
               GenerateToken();
               client = null;
           }
          
           return client;
       }
       public static void GenerateToken()
       {
           Browser b = new Browser(UrlType.Login);
           b.Show();
       }
       public static string ExtendToken(string oldToken)
       {
           var fb = new FacebookClient();
           dynamic result = fb.Get("oauth/access_token", new
           {
               client_id = Data.Get("id"),
               client_secret = Data.Get("secret"),
               grant_type = "fb_exchange_token",
               fb_exchange_token = oldToken
           });
           return result.access_token;
       }

       public static void MarkNotificationAsRead(string notificationId)
       {
           var client = GetClient();
           if (client!=null&&!Program.ongoingAuth)
           {
               client.Post(notificationId, new {unread="false" });
           }
           
       }
       public static string ExtractCommentIdFromLink(string link)
       {
           return link.Split('?').Last().Split('&').Where(c => c.Contains("comment_id")).First().Split('=').Last();
       }
       public static string ExtractPostIdFromLink(string link)
       {
           var parts=link.Split('?').First().Split('/').ToList();

           return parts[parts.IndexOf("permalink") + 1];
       }
       public static dynamic GetComment(string commentId)
       {
           var client = GetClient();
          return client.Get(commentId);
       }
       public static void ProcessNotification(dynamic notification)
       {
           if (notification.application.name == "Groups"&&notification.title.ToLower().Contains("mentioned"))
           {
               var comment = GetComment(ExtractCommentIdFromLink(notification.link));
               foreach (var tag in comment.message_tags)
               {
                   if (tag.id == me.id)
                   {
                       //if (comment.message.Contains("ping"))
                       //{
                       string input = comment.message;
                       input = "//" + input;
                       string output = CSCompiler.compile(input);
                           client.Post(ExtractPostIdFromLink(notification.link) + "/comments", new { message = output });
                           break;
                       //}
                   }
               }
               
           }
           MarkNotificationAsRead(notification.id);
       }
    }
}