using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Telegram.Bot;
using Telegram.Bot.Exceptions;
using Telegram.Bot.Polling;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;

namespace SignalsTest
{
    public class Messenger
    {
        TelegramBotClient botClient;

        private static Messenger m_instance;
        public static Messenger instance {  get { if (m_instance == null) { m_instance = new Messenger(); } return m_instance; } }

        public async Task SendMessage(string text, string chat = "@doralockscryptosignals")
        {
            await botClient.SendTextMessageAsync(chat, text);
        }

        public async Task SendLastChart(string chat = "@doralockscryptosignals", string filename="test"){
            FileStream fsSource = new FileStream($"{filename}.png", FileMode.Open, FileAccess.Read);
            InputFile photo = InputFile.FromStream(fsSource);
            await botClient.SendPhotoAsync(chat, photo);
            Console.WriteLine("Photo sent success");
        }

        public Messenger() 
        {
            botClient = new TelegramBotClient("6878629725:AAGWFqmtsvf2xFLOTvsixY-LEG4ho2sLqrw");
            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 except ChatMember related updates
            };
        }
    }
}