TelegramGPTChatBot - Step 1

ChatBot.cs

namespace TelegramChatBot
{
    internal class ChatBot
    {
        public TelegramBotClient client { get; set; }
        public string botName { get; set; }
        public string fullName { get; set; }
        public string personality { get; set; }
        private string apiToken { get; set; }
        public ChatBot(string apiToken, string botName = "BotName", string fullName = "Full Name", string personality = "A helpful and friendly robot.")
        {
            this.apiToken = apiToken;
            this.botName = botName;
            this.fullName = fullName;
            this.personality = personality;
            StartTelegramBotClient();
        }
        public async void StartTelegramBotClient()
        {
            client = new TelegramBotClient(apiToken);

            using CancellationTokenSource cts = new();

            // StartReceiving does not block the caller thread. Receiving is done on the ThreadPool.
            ReceiverOptions receiverOptions = new()
            {
                AllowedUpdates = Array.Empty<UpdateType>() // receive all update types
            };

            client.StartReceiving(
                updateHandler: HandleUpdateAsync,
                pollingErrorHandler: HandlePollingError,
                receiverOptions: receiverOptions,
                cancellationToken: cts.Token
            );
            var me = await client.GetMeAsync();

            Console.WriteLine($"Start listening for @{me.Username}");
            Console.ReadLine();

            // Send cancellation request to stop bot
            cts.Cancel();
        }
        private async Task HandleUpdateAsync(ITelegramBotClient botClient, Update update, CancellationToken cancellationToken)
        {
            if (update.Message is not { } message)
                return;
            if (message.Text is not { } messageText)
                return;
            DateTime targetDate = update.Message.Date;
            TimeSpan timeDiff = DateTime.UtcNow - targetDate;

            //no stale messages
            if (Math.Abs(timeDiff.TotalSeconds) >= 30)
                return;
            //ChatGPT reply to be added in next step. Keep reading.
        }
        private Task HandlePollingError(ITelegramBotClient botClient, Exception exception, CancellationToken cancellationToken)
        {
            var ErrorMessage = exception switch
            {
                ApiRequestException apiRequestException
                    => $"Telegram API Error:\n[{apiRequestException.ErrorCode}]\n{apiRequestException.Message}",
                _ => exception.ToString()
            };

            Console.WriteLine(ErrorMessage);
            return Task.CompletedTask;
        }
    }
}

TelegramGPTBots.cs

namespace TelegramChatBot
{
    internal class TelegramGPTBots
    {
        private List<ChatBot> botClientList = new List<ChatBot>();
        public TelegramGPTBots()
        {
            botClientList.Add(new ChatBot("telegramAPIKey", "insertTelegramBotName", "Susie Green", "You are Susie Green from Curb Your Enthusiasm. Your personality is filled with sarcasm, you are blunt, outspoken, strong-willed, and foul-mouthed."));
            botClientList.Add(new ChatBot("telegramAPIKey", "insertTelegramBotName", "Larry David", "You are Larry David from Curb Your Enthusiasm. Your personality is filled with Sardonic Humor, you are blunt, candid, and self-centered."));
        }
    }
}