/// <summary>
/// Join user to chat that
/// already exists.
/// </summary>
/// <param name="chatId"></param>
/// <param name="userId"></param>
/// <returns></returns>
public async Task <ChatResponse> JoinUserToChat(string chatId, string userId)
{
var realChatId = Guid.Parse(chatId);
var userChat = new ApplicationUserChat
{
ChatId = realChatId,
UserId = userId
};
var alreadyJoined = _repository.CheckUserChatExistance(userChat);
if (alreadyJoined)
{
return(ChatResponse.Successfull());
}
var success = await _repository.SaveUserChat(userChat);
if (!success)
{
return(ChatResponse.Unsuccessful("Error saving userchat relation."));
}
return(ChatResponse.Successfull());
}
/// <summary>
/// Update user chat relation.
/// </summary>
/// <param name="userChat"></param>
/// <returns></returns>
public async Task <bool> UpdateUserChat(ApplicationUserChat userChat)
{
_db.Entry(userChat).State = EntityState.Modified;
try
{
_db.SaveChanges();
}
catch (Exception ex)
{
return(false);
}
return(true);
}
/// <summary>
/// Delete user-chat relation
/// from db.
/// </summary>
/// <param name="userChat"></param>
/// <returns></returns>
public async Task <bool> DeleteUserChat(ApplicationUserChat userChat)
{
_db.UserChats.Remove(userChat);
try
{
await _db.SaveChangesAsync();
}
catch (Exception ex)
{
_logsManager.SaveLog(userChat, ex.Message);
return(false);
}
return(true);
}
/// <summary>
/// Helper method for
/// assigning all users to
/// newly created chat.
/// </summary>
/// <param name="chat"></param>
/// <param name="users"></param>
/// <returns></returns>
private ICollection <ApplicationUserChat> SetChatUsers(Chat chat, List <ApplicationUser> users)
{
var chatUsers = new List <ApplicationUserChat>();
foreach (var user in users)
{
var newChatUser = new ApplicationUserChat
{
ApplicationUser = user,
Chat = chat
};
chatUsers.Add(newChatUser);
}
return(chatUsers);
}
/// <summary>
/// Remove user from
/// related chat.
/// </summary>
/// <param name="chatId"></param>
/// <param name="userId"></param>
/// <returns></returns>
public async Task <ChatResponse> RemoveUserFromChat(string chatId, string userId)
{
var realChatId = Guid.Parse(chatId);
var userChat = new ApplicationUserChat
{
ChatId = realChatId,
UserId = userId
};
var success = await _repository.DeleteUserChat(userChat);
if (!success)
{
return(ChatResponse.Unsuccessful("Error removing userchat relation."));
}
return(ChatResponse.Successfull());
}
/// <summary>
/// Checks if user is
/// already joined to chat.
/// </summary>
/// <param name="userChat"></param>
/// <returns></returns>
public bool CheckUserChatExistance(ApplicationUserChat userChat)
{
return(_db.UserChats
.FirstOrDefault(x => x.ChatId == userChat.ChatId &&
x.UserId == userChat.UserId) != null);
}
