using System;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.ApplicationModel.Core;
using Windows.Foundation;
using Windows.UI;
using Windows.UI.ViewManagement;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

namespace PointerButton
{
  /// <summary>
  /// Provides application-specific behavior to supplement the default Application class.
  /// </summary>
  sealed partial class App : Application
  {
    /// <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()
    {
      this.InitializeComponent();
      this.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)
    {
      Frame rootFrame = Window.Current.Content as Frame;

      // Do not repeat app initialization when the Window already has content,
      // just ensure that the window is active
      if (rootFrame == null)
      {
        // Create a Frame to act as the navigation context and navigate to the first page
        rootFrame = new Frame();

        rootFrame.NavigationFailed += OnNavigationFailed;

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

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

      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);
      }

      // assigns colors to the title bar
      SetupTitleBar();

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

    /// <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();
    }


    private void SetupTitleBar()
    {
      ApplicationView view = ApplicationView.GetForCurrentView();
      Color systemButtonColor = Color.FromArgb(255, 137, 144, 153);

      // set window size + title bar colors
      view.SetPreferredMinSize(new Size(320, 320));
      view.TitleBar.BackgroundColor = Colors.Transparent;
      view.TitleBar.ForegroundColor = Colors.Transparent;
      view.TitleBar.ButtonForegroundColor = systemButtonColor;
      view.TitleBar.ButtonHoverForegroundColor = systemButtonColor;
      view.TitleBar.ButtonPressedForegroundColor = systemButtonColor;
      view.TitleBar.ButtonInactiveForegroundColor = systemButtonColor;
      view.TitleBar.InactiveForegroundColor = Colors.Transparent;
      view.TitleBar.ButtonBackgroundColor = Colors.Transparent;
      view.TitleBar.ButtonHoverBackgroundColor = Colors.Transparent;
      view.TitleBar.ButtonInactiveBackgroundColor = Colors.Transparent;
      view.TitleBar.ButtonPressedBackgroundColor = Colors.Transparent;
      view.TitleBar.InactiveBackgroundColor = Colors.Transparent;

      // change title bar to be not part of the canvas
      CoreApplication.GetCurrentView().TitleBar.ExtendViewIntoTitleBar = true;
    }
  }
}