﻿namespace LiveAdd
{
    using System;
    using Windows.ApplicationModel;
    using Windows.ApplicationModel.Activation;
    using Windows.UI.Xaml;
    using Windows.UI.Xaml.Controls;
    using Windows.UI.Xaml.Navigation;

    using Pages;
    using Parse;
    using Models;
    using Windows.UI.Core;    /// <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()
        {
            Microsoft.ApplicationInsights.WindowsAppInitializer.InitializeAsync(
                Microsoft.ApplicationInsights.WindowsCollectors.Metadata |
                Microsoft.ApplicationInsights.WindowsCollectors.Session);
            this.InitializeComponent();
            this.Suspending += OnSuspending;

            this.SetupParse();
        }

        /// <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)
        {

#if DEBUG
            if (System.Diagnostics.Debugger.IsAttached)
            {
                this.DebugSettings.EnableFrameRateCounter = true;
            }
#endif

            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;

               //method for back button support 
               rootFrame.Navigated += OnNavigated;

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

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

                //Register a handler for BackRequested events and set the
                //visibility of the Back button

           SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;

                SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
                    rootFrame.CanGoBack
                    ? AppViewBackButtonVisibility.Visible
                    : AppViewBackButtonVisibility.Collapsed;
            }

            if (rootFrame.Content == null)
            {
                Type pageType;
                if (ParseUser.CurrentUser != null)
                {
                    pageType = typeof(MainPage);
                }
                else
                {
                    pageType = typeof(LoginPage);
                }

                rootFrame.Navigate(pageType, e.Arguments);
            }
            // 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 OnNavigated(object sender, NavigationEventArgs e)
        {
            //Each time a navigation event occurs, update the Back button's visibility
            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
                ((Frame)sender).CanGoBack
                ? AppViewBackButtonVisibility.Visible
                : AppViewBackButtonVisibility.Collapsed;
        }

        private void OnBackRequested(object sender, BackRequestedEventArgs e)
        {
            Frame rootFrame = Window.Current.Content as Frame;

            if (rootFrame.CanGoBack)
            {
                e.Handled = true;
                rootFrame.GoBack();
            }
        }

        private void SetupParse()
        {
            ParseObject.RegisterSubclass<AddModel>();

            ParseClient.Initialize("JWp5vR5XqPNJFX87vGXWObiUaBxSzung3DLP3Lhp", "9zQiTq5p4SSa7QUdhs8g8OD9696Bdt5u8lVR8mlk");
        }
    }
}
