public Answer PostAnswer(AnswerCreateRequestDTO a, int accountId)
{
//Validations
Account answerer = _userManagementServices.FindById(accountId);
PostedQuestion question = _questionServices.GetPostedQuestion(a.QuestionId);
if (question.IsClosed)
{
throw new QuestionIsClosedException("Question is closed");
}
if (answerer.Exp < question.ExpNeededToAnswer)
{
throw new NotEnoughExpException("User does not have enough Exp to answer");
}
//Create Answer after passed in Answer is validated
Answer answer = new Answer()
{
QuestionId = a.QuestionId,
AccountId = accountId,
Text = a.Text,
};
//Post Answer
return(_answerServices.PostAnswer(answer));
}
/// <summary>
/// Method to send a message to another user
/// Then messenger services will try to create a chat history first
/// Then save the message to database. Dbcontext will call SaveChanges after those 2 operations finish.
/// </summary>
/// <param name="conversation"></param>
public Message SaveMessageToDatabase(Message message, int authUserId, int contactUserId)
{
// On the auth user's side, try to check if there is a conversation with the contact
Conversation authUserConversation = _msServices.GetConversationBetweenUsers(authUserId, contactUserId);
// On the contact user's side, try to check if there is a conversation with the contact
Conversation contactUserConversation = _msServices.GetConversationBetweenUsers(contactUserId, authUserId);
// Retrieve auth user name using auth user id
var authUsername = _umServices.FindById(authUserId).UserName;
// Retrieve contact user name using contact Id
var contactUsername = _umServices.FindById(contactUserId).UserName;
// If there is no conversation with the contact on auth user'side
if (authUserConversation == null)
{
// Create one
authUserConversation = _msServices.CreateConversation(authUserId, contactUserId, contactUsername);
// Temporary assign a negative conversation id to avoid conflict when saving both coversations at same time
authUserConversation.Id = -1;
}
if (contactUserConversation == null)
{
contactUserConversation = _msServices.CreateConversation(contactUserId, authUserId, authUsername);
contactUserConversation.Id = -2;
}
// Create a message which will be saved in auth user's conversation
var authUserMessage = new Message
{
// Refer the message to auth user 's conversation
ConversationId = authUserConversation.Id,
MessageContent = message.MessageContent,
OutgoingMessage = true,
CreatedDate = DateTime.Now
};
// Create a message which will be saved in contact user's conversation
var targetUserMessage = new Message
{
// Refer the message to contact user 's conversation
ConversationId = contactUserConversation.Id,
MessageContent = message.MessageContent,
OutgoingMessage = false,
CreatedDate = DateTime.Now
};
// Mark the conversation of contact user that has new message
contactUserConversation.HasNewMessage = true;
//Update time
authUserConversation.ModifiedDate = DateTime.Now;
contactUserConversation.ModifiedDate = DateTime.Now;
// Save both messages to message table
_msServices.SaveMessageToDatabase(authUserMessage);
_msServices.SaveMessageToDatabase(targetUserMessage);
_DbContext.SaveChanges();
return(authUserMessage);
}
