Netflix Browser for Windows Phone 7 - Part 1

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Data.Services.Client;
using System.Diagnostics;
using System.Linq;
using System.Net;

using NetflixModel;

namespace NetflixBrowser
{
	public class GenreDvdsViewModel : INotifyPropertyChanged
	{	
		bool loaded;
		public bool Loaded
		{
			get
			{
				return loaded;
			}
			set
			{
				loaded = value;
				OnPropertyChanged("Loaded");
			}
		}
		
		bool busy;
		public bool Busy
		{
			get
			{
				return busy;
			}
			set
			{
				busy = value;
				OnPropertyChanged("Busy");
			}
		}

		String selectedGenreName;
		public String SelectedGenreName
		{
			get
			{
				return selectedGenreName;
			}
			set
			{
				selectedGenreName = value;
				OnPropertyChanged("SelectedGenreName");
			}
		}

		ObservableCollection<Title> genreTitlesByYear;
		public ObservableCollection<Title> GenreTitlesByYear
		{
			get
			{
				return genreTitlesByYear;
			}
			set
			{
				genreTitlesByYear = value;
				OnPropertyChanged("GenreTitlesByYear");
			}
		}

		ObservableCollection<Title> genreTitlesByRating; 
		public ObservableCollection<Title> GenreTitlesByRating
		{
			get
				{
				return genreTitlesByRating;
			}
			set
			{
				genreTitlesByRating = value;
				OnPropertyChanged("GenreTitlesByRating");
			}
		}

		DataServiceCollection<Title> genreTitles = new DataServiceCollection<Title>();
		public DataServiceCollection<Title> GenreTitles
		{
			get
			{
				return genreTitles;
			}
			
		}

		public void LoadGenreTitles(string genreName)
		{
			string genreId = HttpUtility.UrlEncode(genreName);
			genreTitles = DataLayer.GetTitlesForGenre(genreId);
			SelectedGenreName = genreName;
			Loaded = false;
			Busy = true;
			
			if (genreTitles.Count() == 0)
			{
				// Load related titles.
				genreTitles.LoadAsync();
			}
			else
			{
				Loaded = true;
				Busy = false;
				GetTitlesByYear(genreTitles);
				GetTitlesByRating(genreTitles);
			}

			genreTitles.LoadCompleted += new EventHandler<LoadCompletedEventArgs>((sender, args) =>
			{
				// Odata has some limitations. Loading the Titles always raises the below exception, but Titles get loaded. 
				if (args.Error != null && !args.Error.Message.Contains("Wrong number of arguments specified"))
				{
					Debug.WriteLine(
						"Requesting titles failed. " + args.Error.Message);
				}

				Loaded = true;
				Busy = false;
				GetTitlesByYear(genreTitles);
				GetTitlesByRating(genreTitles);
			});
		}

		public void GetTitlesByYear(DataServiceCollection<Title> titles)
		{
			//if (GenreTitlesByYear !=null && GenreTitlesByYear.Count() != 0)
			//{
			//    return;
			//}
			genreTitlesByYear = new ObservableCollection<Title>();
			var query  = (from t in titles
						  orderby t.ReleaseYear descending
						select t).Take(10);

			foreach (Title title in query)
			{
				GenreTitlesByYear.Add(title);
			}
		}


		public void GetTitlesByRating(DataServiceCollection<Title> titles)
		{
			//if (genreTitlesByRating != null && GenreTitlesByRating.Count() != 0)
			//{
			//    return;
			//}
			genreTitlesByRating = new ObservableCollection<Title>();
			var query = (from t in titles
						 orderby t.AverageRating descending 
						 select t).Take(10);

			foreach (Title title in query)
			{
				GenreTitlesByRating.Add(title);
			}
		}

		public event PropertyChangedEventHandler PropertyChanged;	

		protected void OnPropertyChanged(string propertyName)
		{
			if (PropertyChanged != null)
			{
				PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
			}
		}

	}
}