private async Task EnsureWindow()

in XamlControlsGallery/App.xaml.cs [130:221]
72 lines of code
14 McCabe index (conditional complexity)

        private async Task EnsureWindow(IActivatedEventArgs args)
        {
            // No matter what our destination is, we're going to need control data loaded - let's knock that out now.
            // We'll never need to do this again.
            await ControlInfoDataSource.Instance.GetGroupsAsync();

            Frame rootFrame = GetRootFrame();

            ThemeHelper.Initialize();

            if (args.PreviousExecutionState == ApplicationExecutionState.Terminated
                    || args.PreviousExecutionState == ApplicationExecutionState.Suspended)
            {
                try
                {
                    await SuspensionManager.RestoreAsync();
                }
                catch (SuspensionManagerException)
                {
                    //Something went wrong restoring state.
                    //Assume there is no state and continue
                }

                Window.Current.Activate();

                UpdateNavigationBasedOnSelectedPage(rootFrame);
                return;
            }

            Type targetPageType = typeof(NewControlsPage);
            string targetPageArguments = string.Empty;

            if (args.Kind == ActivationKind.Launch)
            {
                targetPageArguments = ((LaunchActivatedEventArgs)args).Arguments;
            }
            else if (args.Kind == ActivationKind.Protocol)
            {
                Match match;

                string targetId = string.Empty;

                switch (((ProtocolActivatedEventArgs)args).Uri?.AbsoluteUri)
                {
                    case string s when IsMatching(s, "(/*)category/(.*)"):
                        targetId = match.Groups[2]?.ToString();
                        if (targetId == "AllControls")
                        {
                            targetPageType = typeof(AllControlsPage);
                        }
                        else if (targetId == "NewControls")
                        {
                            targetPageType = typeof(NewControlsPage);
                        }
                        else if (ControlInfoDataSource.Instance.Groups.Any(g => g.UniqueId == targetId))
                        {
                            targetPageType = typeof(SectionPage);
                        }
                        break;

                    case string s when IsMatching(s, "(/*)item/(.*)"):
                        targetId = match.Groups[2]?.ToString();
                        if (ControlInfoDataSource.Instance.Groups.Any(g => g.Items.Any(i => i.UniqueId == targetId)))
                        {
                            targetPageType = typeof(ItemPage);
                        }
                        break;
                }

                targetPageArguments = targetId;

                bool IsMatching(string parent, string expression)
                {
                    match = Regex.Match(parent, expression);
                    return match.Success;
                }
            }

            rootFrame.Navigate(targetPageType, targetPageArguments);

            if (targetPageType == typeof(NewControlsPage))
            {
                ((Microsoft.UI.Xaml.Controls.NavigationViewItem)((NavigationRootPage)Window.Current.Content).NavigationView.MenuItems[0]).IsSelected = true;
            }
            else if (targetPageType == typeof(ItemPage))
            {
                NavigationRootPage.Current.EnsureNavigationSelection(targetPageArguments);
            }

            // Ensure the current window is active
            Window.Current.Activate();
        }