public static async void TimerHandler(object obj, MessageEventArgs args)
{
var text = args.Message?.Text;
if (!(obj is TelegramBotClient client))
{
return;
}
if (string.IsNullOrEmpty(text))
{
return;
}
if (text == StartCommand)
{
await client.SendTextMessageIgnoreAPIErrorsAsync(args.GetChatId(), StartAnswer);
return;
}
if (!TimeSpan.TryParseExact(text, TimeSpanFormat, CultureInfo.InvariantCulture, out var timeSpan))
{
return;
}
var sec = timeSpan.TotalSeconds;
var infoMsg = await client.SendTextMessageAsync(args.GetChatId(),
$@"The timer for {timeSpan.ToString(TimeSpanFormat)} is being started...");
DateTime startTime = DateTime.Now;
while (true)
{
var delayTask = Task.Delay(1000);
var leftSeconds = (DateTime.Now - startTime).TotalSeconds;
if (leftSeconds >= sec)
{
break;
}
var editTask =
client.EditMessageTextAsync(
args.GetChatId(),
infoMsg.MessageId,
$"Timer for {timeSpan.ToString(TimeSpanFormat)} is running! {Environment.NewLine}" +
$"Current remaining time: {timeSpan - new TimeSpan(0, 0, seconds: (int)leftSeconds)}");
Task.WaitAll(editTask, delayTask);
}
var editAfterRunTask =
client.EditMessageTextAsync(
args.GetChatId(),
infoMsg.MessageId,
$"Timer for {timeSpan.ToString(TimeSpanFormat)} has run out!"
);
var sendTask =
client.SendTextMessageAsync(
args.GetChatId(),
$"@{args.GetSenderUserName()} The timer has ran out!");
await Task.WhenAll(editAfterRunTask, sendTask);
}