private async Task EnableFaceDetection()

in FamilyNotes/MainPage.xaml.cs [365:407]
37 lines of code
6 McCabe index (conditional complexity)

        private async Task EnableFaceDetection()
        {
            // Inform the user if we do not have a Azure Face service key and then exit without doing anything.
            if (AppSettings.FaceApiKey == "")
            {
                ContentDialog noFaceKeyDialog = new ContentDialog
                {
                    Title = "No Azure Face key",
                    Content = "You need an Azure Face service key, which you define in settings, to use facial recognition.",
                    CloseButtonText = "Ok"
                };
                await noFaceKeyDialog.ShowAsync();
                FaceDetectionButton.IsChecked = false;
                return;
            }

            if (SetCameraButton.IsEnabled)
            {
                // Make sure the user accepts privacy implications.
                var dialog = new WarningDialog();
                await dialog.ShowAsync();
                if (dialog.WarningAccept == false)
                {
                    FaceDetectionButton.IsChecked = false;
                    return;
                }
            }

            bool result = await _presence.EnableFaceDetection();
            if (result)
            {
                _presence.FilterOnFace += UserFilterFromDetection;
            }
            else
            {
                _presence.FilterOnFace -= UserFilterFromDetection;
            }

            ImageWarningBar.IsOpen = result;
            // Update the face detection icon depending on whether the effect exists or not.
            (FaceDetectionButton.Icon as SymbolIcon).Symbol = (result) ? Symbol.View : Symbol.WebCam;
            SetCameraButton.IsEnabled = result != true;
        }