public static async Task <bool> StartEntryWeek(DiscordSocketClient client, double?days2end = null, bool?force = null, [Remainder] string theme = "")
        {
            SocketTextChannel channel = Utils.FindChannel(client, Storage.xs.Settings.GetWorkingChannel());

            if (channel == null)
            {
                return(false);
            }

            Storage.xs.History.RecordTrade(Storage.xs.Entries);
            await GoogleDriveHandler.UploadGoogleFile(Storage.xs.HISTORY_PATH);

            Storage.xs.ClearStorage(Storage.xs.Entries);
            Storage.xs.Settings.ActivateTrade(Storage.ApplicationSettings.TradeSegment.EntryWeek, null /*days2start*/, days2end, force, null /*bGDriveOn*/, true /*bResetPoll*/);
            Storage.xs.Entries.SetTheme(theme);

            string outMessage = $"{string.Format(Properties.Resources.ENTRY_WEEK, Config.CmdPrefix, "set entry", "about")}"
                                + (string.IsNullOrWhiteSpace(Storage.xs.Entries.GetTheme()) ? "" : $"\n{string.Format(Properties.Resources.TRADE_THIS_THEME, Storage.xs.Entries.GetTheme())}");

            await channel.SendMessageAsync(embed : Utils.EmbedMessage(client, outMessage, Utils.Emotion.positive));

            await Utils.CreateOrEditNaughtyList(client, Storage.xs.Settings.GetWorkingChannel());

            var subscribers = new List <ulong>(Storage.xs.Settings.GetSubscribers());

            // notify those that did not send their art on time
            var artHistory0 = Utils.GetAppDataFromHistory(0);

            foreach (Storage.UserData user in Utils.GetMissingArt(artHistory0))
            {
                subscribers.Remove(user.UserId); // don't notify subscribers twice

                SocketUser su = client.GetUser(user.UserId);
                if (su != null)
                {
                    await su.SendMessageAsync(embed : Utils.EmbedMessage(client, string.Format(Properties.Resources.TRADE_ART_LATE_DM, user.UserId, artHistory0.GetTheme())
                                                                         + $"\n{string.Format(Properties.Resources.GLOBAL_CMDHELP, Config.CmdPrefix, $"reveal art {artHistory0.GetTheme()}", "register the missing art")}", Utils.Emotion.negative));
                }
            }

            // notify those that subscribed for notifications
            if (string.IsNullOrWhiteSpace(Storage.xs.Entries.GetTheme()) && !await Utils.CreateThemePoll(client))
            {
                await Utils.NotifySubscribers(client, "the `entry week` started, please visit teanicorn art trade channel for more information", subscribers);
            }

            return(true);
        }
        public async Task Backup([Summary("string mode empty = checkpoint, json = send json files in DM, sync = sync to gDrive")] string mode = "")
        {
            var user = Context.Message.Author;

            if (!Utils.IsAdminUser(user))
            {
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "admin only command"), Utils.Emotion.neutral));

                return;
            }

            mode = mode.ToLower().Trim();
            if (mode.Equals("json"))
            {
                await user.SendFileAsync(Storage.xs.ENTRIES_PATH);

                await user.SendFileAsync(Storage.xs.HISTORY_PATH);

                await user.SendFileAsync(Storage.xs.SETTINGS_PATH);
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_SUCCESS, user.Id, "all storages have been dumped"), Utils.Emotion.positive));
            }
            else if (mode.Equals("sync"))
            {
                if (!await GoogleDriveHandler.UploadGoogleFile(Storage.xs.ENTRIES_PATH))
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "unable to sent data to cloud"), Utils.Emotion.neutral));

                    return;
                }

                if (!await GoogleDriveHandler.UploadGoogleFile(Storage.xs.HISTORY_PATH))
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "unable to sent data to cloud"), Utils.Emotion.neutral));

                    return;
                }

                if (!await GoogleDriveHandler.UploadGoogleFile(Storage.xs.SETTINGS_PATH))
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "unable to sent data to cloud"), Utils.Emotion.neutral));

                    return;
                }

                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_SUCCESS, user.Id, "all storages have been synced with cloud"), Utils.Emotion.positive));
            }
            else if (mode.Equals("save"))
            {
                Storage.xs.Entries.Save();
                Storage.xs.Settings.Save();
                Storage.xs.History.Save();
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_SUCCESS, user.Id, "all storages have been saved to disk"), Utils.Emotion.positive));
            }
            else
            {
                Storage.xs.BackupStorage(Storage.xs.Entries);
                Storage.xs.BackupStorage(Storage.xs.Settings);
                Storage.xs.BackupStorage(Storage.xs.History);
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_SUCCESS, user.Id, "all storages have been backed up on disk"), Utils.Emotion.positive));
            }
        }
        public async Task RevealArt([Remainder][Summary("theme of the art trade for which you want to register your art (`optional`)")] string theme = null)
        {
            var user = Context.Message.Author;

            Storage.ApplicationData foundTrade = null;

            if (!string.IsNullOrWhiteSpace(theme))
            {
                theme = theme.ToLower();

                for (int i = 0; i < Storage.xs.History.Count() && i < 3; ++i)
                {
                    var d = Storage.xs.History.GetTrade(i);
                    if (d == null)
                    {
                        continue;
                    }
                    if (string.IsNullOrWhiteSpace(d.GetTheme()))
                    {
                        continue;
                    }
                    if (!theme.Contains(d.GetTheme().ToLower().Trim()))
                    {
                        continue;
                    }

                    foundTrade = d;
                    break;
                }
            }

            if (foundTrade == null)
            {
                foundTrade = Storage.xs.Entries;
            }

            bool bCurrentTrade = foundTrade == Storage.xs.Entries;

            if (bCurrentTrade && !Storage.xs.Settings.IsTradeMonthActive())
            {
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "entry week in progress, partners haven't been assigned yet"), Utils.Emotion.neutral));

                return;
            }

            bool bPostponeReveal = false;

            if (bCurrentTrade && !Storage.xs.Settings.HasNotifyFlag(Storage.ApplicationSettings.NofifyFlags.Closing))
            {
                string outputMsg = await Utils.CleanupWrongChannelMessage(Context, "please wait for the trade to end or submit your art in a direct message");

                if (string.IsNullOrWhiteSpace(outputMsg))
                {
                    bPostponeReveal = true;
                }
                else
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, outputMsg), Utils.Emotion.neutral));

                    return;
                }
            }

            var attachments = Context.Message.Attachments;

            if (attachments.Count <= 0)
            {
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_MISSING_INPUT, user.Id, "embeded image"), Utils.Emotion.neutral));

                return;
            }

            var data = foundTrade.Get(user.Id);

            if (data == null)
            {
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ITEM_NOT_FOUND, user.Id, "entry"), Utils.Emotion.neutral));

                return;
            }

            Storage.UserData nextUserData;
            if (foundTrade.Next(user.Id, out nextUserData))
            {
                data.ArtUrl = attachments.FirstOrDefault().Url;
                foundTrade.Set(data);

                if (!bCurrentTrade)
                {
                    await GoogleDriveHandler.UploadGoogleFile(Storage.xs.HISTORY_PATH);
                }

                var client   = Context.Client;
                var nextUser = client.GetUser(nextUserData.UserId);
                if (nextUser == null)
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "could not find your partner"), Utils.Emotion.neutral));

                    return;
                }

                if (bPostponeReveal)
                {
                    await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_WARNING, user.Id, "your art has been saved, but it won't be revealed to your partner until the trade ends"), Utils.Emotion.neutral));
                }
                else
                {
                    string monthTheme = Storage.xs.Entries.GetTheme();
                    if (!bCurrentTrade)
                    {
                        monthTheme = foundTrade.GetTheme();
                        await Utils.CreateOrEditNaughtyList(Context.Client, Storage.xs.Settings.GetWorkingChannel(), user);
                    }

                    if (await SendPartnerArtResponse(Context.Client, data, nextUser, monthTheme))
                    {
                        await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.REF_REVEAL_NOTIFY, user.Id, nextUser.Id), Utils.Emotion.positive));
                    }
                    else
                    {
                        await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ERROR, user.Id, "could not notify your partner"), Utils.Emotion.neutral));
                    }
                }
            }
            else
            {
                await ReplyAsync(embed : Utils.EmbedMessage(Context.Client, string.Format(Properties.Resources.GLOBAL_ITEM_NOT_FOUND, user.Id, "partner"), Utils.Emotion.neutral));
            }
        }