public async Task <IActionResult> GetLastTwentyMessages(GetMessagesDTO getMessage)
{
if (!ModelState.IsValid)
{
return(BadRequest("Bad Request"));
}
var messages = await _repository.GetMessageCointainer(getMessage).ConfigureAwait(true);
if (messages == null)
{
return(NotFound("Not found any chats with requester id."));
}
return(Ok(messages));
}
public async Task <IEnumerable <Message> > GetMessageCointainer(GetMessagesDTO getMessages)
{
IList <Message> messages = new List <Message>();
Chat chat = await _context.Chats.FirstOrDefaultAsync(x => x.Id == getMessages.ChatId && x.ChatMemberships.Any(y => y.UserId == getMessages.RequesterId)).ConfigureAwait(true);
User sender = await _context.Users.FirstOrDefaultAsync(x => x.Id == getMessages.RequesterId).ConfigureAwait(true);
if (chat == null || sender == null)
{
return(null);
}
var messagesToProccess = _context.Messages.Where(x => x.ChatId == getMessages.ChatId).ToList();
if (messagesToProccess == null || messagesToProccess.Count == 0)
{
return(messages);
}
if (getMessages.IdLastMessage == 0)
{
getMessages.IdLastMessage = messagesToProccess.LastOrDefault().Id;
}
int iterator = 0;
var messageWithCorrectedId = messagesToProccess.Where(x => x.Id <= getMessages.IdLastMessage).ToList();
for (int i = messageWithCorrectedId.Count - 1; i >= 0; i--)
{
if (messageWithCorrectedId[i] == null)
{
break;
}
messages.Add(messageWithCorrectedId[i]);
iterator++;
if (iterator >= 20)
{
break;
}
}
return(messages.Reverse());
}