public async Task GetChatMessage()

in Code/dotnetLexChatBot/Controllers/HelloChatBotController.cs [73:121]
37 lines of code
6 McCabe index (conditional complexity)

        public async Task<IActionResult> GetChatMessage(string userMessage)
        {
            //Get user session and chat info
            userHttpSession = HttpContext.Session;
            userSessionID = userHttpSession.Id;
            botMessages = userHttpSession.Get<List<ChatBotMessage>>(botMsgKey) ?? new List<ChatBotMessage>();
            lexSessionData = userHttpSession.Get<Dictionary<string, string>>(botAtrribsKey) ?? new Dictionary<string, string>();

            //No message was provided, return to current view
            if (String.IsNullOrEmpty(userMessage)) return View("TestChat", botMessages);

            //A Valid Message exists, Add to page and allow Lex to process
            botMessages.Add(new ChatBotMessage()
            { MsgType = MessageType.UserMessage, ChatMessage = userMessage });

            await postUserData(botMessages);

            //Call Amazon Lex with Text, capture response
            var lexResponse = await awsLexSvc.SendTextMsgToLex(userMessage, lexSessionData, userSessionID);

            lexSessionData = lexResponse.SessionAttributes;
            if (
                lexResponse.DialogState == DialogState.ElicitSlot ||
                lexResponse.DialogState == DialogState.ConfirmIntent
            ) {
                botMessages.Add(
                    new ChatBotMessage()
                    { 
                        MsgType = MessageType.LexMessage, 
                        ChatMessage = lexResponse.Message 
                    });
            } else if (
                lexResponse.DialogState == DialogState.ReadyForFulfillment ||
                lexResponse.DialogState == DialogState.Fulfilled
            ) {
                botMessages.Add(
                    new ChatBotMessage()
                    { 
                        MsgType = MessageType.LexMessage, 
                        ChatMessage = lexResponse.Message ?? "Your order is being processed. Thank you for your business!"
                    });
            }

            //Add updated botMessages and lexSessionData object to Session
            userHttpSession.Set<List<ChatBotMessage>>(botMsgKey, botMessages);
            userHttpSession.Set<Dictionary<string, string>>(botAtrribsKey, lexSessionData);
           
            return View("TestChat", botMessages);
        }