namespace Clock.Desktop
{
    using System;
    using Windows.ApplicationModel;
    using Windows.ApplicationModel.Activation;
    using Windows.UI.Xaml;
    using Windows.UI.Xaml.Controls;
    using Windows.UI.Xaml.Navigation;
    using global::IoC;
    using IoC;
    using Views;
    using static global::IoC.Container;

    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App
    {
        internal readonly IContainer Container =
            Create()
            .Using(new ClockConfiguration())
            .Using<AppConfiguration>();

        /// <summary>
        /// Initializes the singleton application object.  This is the first line of authored code
        /// executed, and as such is the logical equivalent of main() or WinMain().
        /// </summary>
        public App()
        {
            InitializeComponent();
            Suspending += OnSuspending;
        }

        /// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used such as when the application is launched to open a specific file.
        /// </summary>
        /// <param name="e">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs e)
        {
            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (!(Window.Current.Content is Frame rootFrame))
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();
                rootFrame.NavigationFailed += OnNavigationFailed;
                rootFrame.Navigating += OnNavigating;

                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            if (e.PrelaunchActivated == false)
            {
                if (rootFrame.Content == null)
                {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
                }

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

        private void OnNavigating(object sender, NavigatingCancelEventArgs navigatingCancelEventArgs)
        {
            if (!(sender is Frame frame))
            {
                return;
            }

            frame.Content = Container.Resolve<Page>(navigatingCancelEventArgs.SourcePageType, navigatingCancelEventArgs.Parameter);
            navigatingCancelEventArgs.Cancel = true;
        }

        /// <summary>
        /// Invoked when Navigation to a certain page fails
        /// </summary>
        /// <param name="sender">The Frame which failed navigation</param>
        /// <param name="e">Details about the navigation failure</param>
        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            //TODO: Save application state and stop any background activity
            deferral.Complete();
        }
    }
}