public async Task OnTurnAsync()

in SDKV4-Samples/dotnet_core/ComplexDialogBot/ComplexDialogBot.cs [100:155]
44 lines of code
10 McCabe index (conditional complexity)

        public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
        {
            if (turnContext == null)
            {
                throw new ArgumentNullException(nameof(turnContext));
            }

            // Handle Message activity type, which is the main activity type for shown within a conversational interface
            // Message activities may contain text, speech, interactive cards, and binary or unknown attachments.
            // see https://aka.ms/about-bot-activity-message to learn more about the message and other activity types
            if (turnContext.Activity.Type == ActivityTypes.Message)
            {
                // Run the DialogSet - let the framework identify the current state of the dialog from
                // the dialog stack and figure out what (if any) is the active dialog.
                DialogContext dialogContext = await _dialogs.CreateContextAsync(turnContext, cancellationToken);
                DialogTurnResult results = await dialogContext.ContinueDialogAsync(cancellationToken);
                switch (results.Status)
                {
                    case DialogTurnStatus.Cancelled:
                    case DialogTurnStatus.Empty:
                        // If there is no active dialog, we should clear the user info and start a new dialog.
                        await _accessors.UserProfileAccessor.SetAsync(turnContext, new UserProfile(), cancellationToken);
                        await _accessors.UserState.SaveChangesAsync(turnContext, false, cancellationToken);
                        await dialogContext.BeginDialogAsync(TopLevelDialog, null, cancellationToken);
                        break;
                    case DialogTurnStatus.Complete:
                        // If we just finished the dialog, capture and display the results.
                        UserProfile userInfo = results.Result as UserProfile;
                        string status = "You are signed up to review "
                            + (userInfo.CompaniesToReview.Count is 0 ? "no companies" : string.Join(" and ", userInfo.CompaniesToReview))
                            + ".";
                        await turnContext.SendActivityAsync(status);
                        await _accessors.UserProfileAccessor.SetAsync(turnContext, userInfo, cancellationToken);
                        await _accessors.UserState.SaveChangesAsync(turnContext, false, cancellationToken);
                        break;
                    case DialogTurnStatus.Waiting:
                        // If there is an active dialog, we don't need to do anything here.
                        break;
                }

                await _accessors.ConversationState.SaveChangesAsync(turnContext, false, cancellationToken);
            }

            // Processes ConversationUpdate Activities to welcome the user.
            else if (turnContext.Activity.Type == ActivityTypes.ConversationUpdate)
            {
                if (turnContext.Activity.MembersAdded != null)
                {
                    await SendWelcomeMessageAsync(turnContext, cancellationToken);
                }
            }
            else
            {
                await turnContext.SendActivityAsync($"{turnContext.Activity.Type} event detected", cancellationToken: cancellationToken);
            }
        }