using System;
using Telegram.Bot;
using Telegram.Bot.Args;
using Telegram.Bot.Exceptions;
using Telegram.Bot.Types;

namespace BlubbFish.Utils.IoT.Connector {
  public class Telegram {
    private static Telegram instance;
    private TelegramBotClient bot;
    private ChatId chat;

    public delegate void TelegramMessage(Object sender, TelegramEventArgs e);

    public event TelegramMessage MessageIncomming;
    public event TelegramMessage MessageSending;

    private Telegram() {
      this.bot = new TelegramBotClient(InIReader.GetInstance("settings.ini").GetValue("general", "telegram-key"));
      this.bot.OnMessage += this.Bot_OnMessage;
      this.Connect();
    }

    private void Bot_OnMessage(Object sender, MessageEventArgs e) {
      this.MessageIncomming?.Invoke(this, new TelegramEventArgs(e.Message.Text, e.Message.Chat.Id, e.Message.Date));
    }

    public static Telegram Instance {
      get {
        if(instance == null) {
          instance = new Telegram();
        }
        return instance;
      }
    }

    private void Connect() {
      this.bot.StartReceiving();
      this.chat = new ChatId(InIReader.GetInstance("settings.ini").GetValue("general", "chatid"));
    }

    public async void Send(String text) {
      try {
        Message x = await this.bot.SendTextMessageAsync(this.chat, text);
        this.MessageSending?.Invoke(this, new TelegramEventArgs(x.Text, x.Chat.Id, x.Date));
      } catch(ApiRequestException e) {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.WriteLine(e.Message+" "+e.ErrorCode+" "+e.Parameters);
        Console.ForegroundColor = ConsoleColor.White;
      }
    }
  }
  public class TelegramEventArgs : EventArgs {
    public TelegramEventArgs() : base() { }
    public TelegramEventArgs(String message, Int64 UserId, DateTime date) {
      this.UserId = UserId;
      this.Message = message;
      this.Date = date;
    }

    public Int64 UserId { get; private set; }
    public String Message { get; private set; }
    public DateTime Date { get; private set; }
  }
}