private async Task <Tuple <int, DateTime?> > GetUnreadNotificationsCountAndLastTimestampAsync(string userId, FeedNotificationTransport transport, DateTime?from = null)
{
var realFrom = from ?? await feedRepo.GetFeedViewTimestampAsync(userId, transport.Id) ?? DateTime.MinValue;
var unreadCount = await feedRepo.GetNotificationsCountAsync(userId, realFrom, transport);
if (unreadCount > 0)
{
from = await feedRepo.GetLastDeliveryTimestampAsync(transport);
}
return(Tuple.Create(unreadCount, from));
}
