XAMLFinance – A Cross-platform WPF, Silverlight & WP7 Application

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using XAMLFinance.ViewModel;
using XAMLFinance.DataSource;
using System.Xml.Serialization;
using System.IO;
using System.Xml;
using System.IO.IsolatedStorage;
using System.ComponentModel;

namespace XAMLFinance
{
  public partial class App : Application
  {
    public IDataSource DataSource = new DataSource.DataSource();

    private readonly string ModelKey = "Key";

    private readonly string FavouritesFilename = "favourites.txt";

    public static new App Current
    {
      get
      {
        return (App)Application.Current;
      }
    }

    public XAMLFinanceViewModel ViewModel { get; private set; }

    // Easy access to the root frame
    public PhoneApplicationFrame RootFrame { get; private set; }

    // Constructor
    public App()
    {
      
      // Global handler for uncaught exceptions. 
      // Note that exceptions thrown by ApplicationBarItem.Click will not get caught here.
      UnhandledException += Application_UnhandledException;

      // Standard Silverlight initialization
      InitializeComponent();

      // Phone-specific initialization
      InitializePhoneApplication();

     
    }
     

    // Code to execute when the application is launching (eg, from Start)
    // This code will not execute when the application is reactivated
    private void Application_Launching(object sender, LaunchingEventArgs e)
    {
      ViewModel = new XAMLFinanceViewModel();
      
      // load the favourites from isolated storage
      string favouritesCSV = "";
      using (var store = IsolatedStorageFile.GetUserStoreForApplication())
      using (var stream = new IsolatedStorageFileStream(FavouritesFilename, FileMode.OpenOrCreate, FileAccess.Read, store))
      using (var reader = new StreamReader(stream))
      {
        if (!reader.EndOfStream)
        {
          favouritesCSV = reader.ReadToEnd();
        }
      }

      PropertyChangedEventHandler populateFavouritesView = null;
      populateFavouritesView = (s, e2) =>
        {
          if (ViewModel.Pricelist.Prices.Count > 0)
          {
            var favourites = favouritesCSV.Split(',');
            foreach (var favourite in favourites)
            {
              var instrument = ViewModel.Pricelist.Prices.SingleOrDefault(i => i.Symbol == favourite);
              if (instrument != null)
              {
                ViewModel.Favourites.Add(instrument.PriceViewModel);
              }
            }

            ViewModel.PropertyChanged -= populateFavouritesView;
          }
        };

      ViewModel.PropertyChanged += populateFavouritesView;


      ViewModel.Init();
      RootFrame.DataContext = ViewModel;
    }

    private void PersistFavourites()
    {
      using (var store = IsolatedStorageFile.GetUserStoreForApplication())
      using (var stream = new IsolatedStorageFileStream(FavouritesFilename, FileMode.Create, FileAccess.Write, store))
      using (var writer = new StreamWriter(stream))
      {
        String favouritesCSV = string.Join(",", ViewModel.Favourites.Select(item => item.Symbol).ToArray());
        writer.Write(favouritesCSV);
      }
    }

    // Code to execute when the application is activated (brought to foreground)
    // This code will not execute when the application is first launched
    private void Application_Activated(object sender, ActivatedEventArgs e)
    {
      if (PhoneApplicationService.Current.State.ContainsKey(ModelKey))
      {
        ViewModel = PhoneApplicationService.Current.State[ModelKey] as XAMLFinanceViewModel;
        RootFrame.DataContext = ViewModel;
      }
    }

    // Code to execute when the application is deactivated (sent to background)
    // This code will not execute when the application is closing
    private void Application_Deactivated(object sender, DeactivatedEventArgs e)
    {
      PhoneApplicationService.Current.State[ModelKey] = ViewModel;
    }

    // Code to execute when the application is closing (eg, user hit Back)
    // This code will not execute when the application is deactivated
    private void Application_Closing(object sender, ClosingEventArgs e)
    {
      // persist data using isolated storage
      PersistFavourites();
    }

    // Code to execute if a navigation fails
    void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
    {
      if (System.Diagnostics.Debugger.IsAttached)
      {
        // A navigation has failed; break into the debugger
        System.Diagnostics.Debugger.Break();
      }
    }

    // Code to execute on Unhandled Exceptions
    private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
    {
      if (System.Diagnostics.Debugger.IsAttached)
      {
        // An unhandled exception has occurred; break into the debugger
        System.Diagnostics.Debugger.Break();
      }
    }

    #region Phone application initialization

    // Avoid double-initialization
    private bool phoneApplicationInitialized = false;

    // Do not add any additional code to this method
    private void InitializePhoneApplication()
    {
      if (phoneApplicationInitialized)
        return;

      // Create the frame but don't set it as RootVisual yet; this allows the splash
      // screen to remain active until the application is ready to render.
      RootFrame = new PhoneApplicationFrame();
      RootFrame.Navigated += CompleteInitializePhoneApplication;

      // Handle navigation failures
      RootFrame.NavigationFailed += RootFrame_NavigationFailed;

      // Ensure we don't initialize again
      phoneApplicationInitialized = true;
    }

    // Do not add any additional code to this method
    private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
    {
      // Set the root visual to allow the application to render
      if (RootVisual != RootFrame)
        RootVisual = RootFrame;

      // Remove this handler since it is no longer needed
      RootFrame.Navigated -= CompleteInitializePhoneApplication;
    }

    #endregion
  }
}