public IProcessingResult Undo(IBot bot, IProcessingResult pr, string arg)
    {
        pr.Solved = true;
        pr.Respond = true;
        pr.ResponseOrigin = Helper.GetExecutingMethodName(this);

        var editablePosts = bot.GetStillEditableMessages();

        var wc = Helper.WordCount(arg);
        var a1 = Helper.FirstWord(arg).Trim().TrimStart(':');

        if (wc == 0)
        {
            if (editablePosts.Count > 0)
            {
                var last = editablePosts[0];
                bot.DeleteMessage(last.RoomID, last.MessageID);
                pr.Respond = false;
                return pr;
            }
            else
            {
                pr.ResponseText = "No messages less than 2 minutes old.";
                return pr;
            }
        }

        if (wc == 1)
        {
            if (a1 == "last")
            {
                if (editablePosts.Count > 0)
                {
                    var last = editablePosts[0];
                    bot.DeleteMessage(last.RoomID, last.MessageID);
                    pr.Respond = false;
                    return pr;
                }
                else
                {
                    pr.ResponseText = "No messages less than 2 minutes old.";
                    return pr;
                }
            }
            else
            {
                int i = 0;
                var b = int.TryParse(a1, out i);
                if (!b)
                {
                    pr.ResponseText = "Could not parse the number of messages to delete or messageid, whatever it was.";
                    return pr;
                }
                else
                {
                    if (i < 100)
                    {
                        if (editablePosts.Count > 0)
                        {
                            if (editablePosts.Count >= i)
                            {
                                // get i first posts to delete
                                var todel = new List<IChatMessage>();
                                for (int n = 0; n < i; n++)
                                    todel.Add(editablePosts[n]);

                                foreach (var tod in todel)
                                    bot.DeleteMessage(tod.RoomID, tod.MessageID);

                                pr.Respond = false;
                                return pr;
                            }
                            else
                            {
                                foreach (var tod in editablePosts)
                                    bot.DeleteMessage(tod.RoomID, tod.MessageID);

                                pr.Respond = false;
                                return pr;
                            }
                        }
                        else
                        {
                            pr.ResponseText = "No messages less than 2 minutes old.";
                            return pr;
                        }
                    }
                    else // delete by messageid
                    {
                        // try to get the messageid
                        foreach (var v in editablePosts)
                            if (v.MessageID == i)
                            {
                                bot.DeleteMessage(v.RoomID, v.MessageID);

                                pr.Respond = false;
                                return pr;
                            }
                    }
                }
            }
        }

        var wrest = Helper.TextAfter(arg, a1);

        if (a1.ToLowerInvariant() == "last")
        {
            var v = editablePosts[0].MessageID;

            var last = editablePosts[0];
            bot.DeleteMessage(last.RoomID, last.MessageID);

            pr.Respond = false;
            return pr;
        }
        else
        {
            int mid = 0;
            if (int.TryParse(a1, out mid))
            {

                pr.OwnResponseMessageIDToEdit = mid;
                pr.ResponseText = wrest;
            }
            else
            {
                pr.ResponseText = "Could not parse messageid.";
                return pr;
            }
        }


        return pr;
    }
    public IProcessingResult Undo(IBot bot, IProcessingResult pr, string arg)
    {
        pr.Solved         = true;
        pr.Respond        = true;
        pr.ResponseOrigin = Helper.GetExecutingMethodName(this);

        var editablePosts = bot.GetStillEditableMessages();

        var wc = Helper.WordCount(arg);
        var a1 = Helper.FirstWord(arg).Trim().TrimStart(':');

        if (wc == 0)
        {
            if (editablePosts.Count > 0)
            {
                var last = editablePosts[0];
                bot.DeleteMessage(last.RoomID, last.MessageID);
                pr.Respond = false;
                return(pr);
            }
            else
            {
                pr.ResponseText = "No messages less than 2 minutes old.";
                return(pr);
            }
        }

        if (wc == 1)
        {
            if (a1 == "last")
            {
                if (editablePosts.Count > 0)
                {
                    var last = editablePosts[0];
                    bot.DeleteMessage(last.RoomID, last.MessageID);
                    pr.Respond = false;
                    return(pr);
                }
                else
                {
                    pr.ResponseText = "No messages less than 2 minutes old.";
                    return(pr);
                }
            }
            else
            {
                int i = 0;
                var b = int.TryParse(a1, out i);
                if (!b)
                {
                    pr.ResponseText = "Could not parse the number of messages to delete or messageid, whatever it was.";
                    return(pr);
                }
                else
                {
                    if (i < 100)
                    {
                        if (editablePosts.Count > 0)
                        {
                            if (editablePosts.Count >= i)
                            {
                                // get i first posts to delete
                                var todel = new List <IChatMessage>();
                                for (int n = 0; n < i; n++)
                                {
                                    todel.Add(editablePosts[n]);
                                }

                                foreach (var tod in todel)
                                {
                                    bot.DeleteMessage(tod.RoomID, tod.MessageID);
                                }

                                pr.Respond = false;
                                return(pr);
                            }
                            else
                            {
                                foreach (var tod in editablePosts)
                                {
                                    bot.DeleteMessage(tod.RoomID, tod.MessageID);
                                }

                                pr.Respond = false;
                                return(pr);
                            }
                        }
                        else
                        {
                            pr.ResponseText = "No messages less than 2 minutes old.";
                            return(pr);
                        }
                    }
                    else // delete by messageid
                    {
                        // try to get the messageid
                        foreach (var v in editablePosts)
                        {
                            if (v.MessageID == i)
                            {
                                bot.DeleteMessage(v.RoomID, v.MessageID);

                                pr.Respond = false;
                                return(pr);
                            }
                        }
                    }
                }
            }
        }

        var wrest = Helper.TextAfter(arg, a1);

        if (a1.ToLowerInvariant() == "last")
        {
            var v = editablePosts[0].MessageID;

            var last = editablePosts[0];
            bot.DeleteMessage(last.RoomID, last.MessageID);

            pr.Respond = false;
            return(pr);
        }
        else
        {
            int mid = 0;
            if (int.TryParse(a1, out mid))
            {
                pr.OwnResponseMessageIDToEdit = mid;
                pr.ResponseText = wrest;
            }
            else
            {
                pr.ResponseText = "Could not parse messageid.";
                return(pr);
            }
        }


        return(pr);
    }