using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

using System.Text.RegularExpressions;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Shapes;



namespace Stoffi

{

	/// <summary>

	/// Interaction logic for CreateRandomPlaylist.xaml

	/// </summary>

	public partial class GeneratePlaylist : Window

	{

		#region Constructor



		/// <summary>

		/// Creates a dialog for generating a random playlist.

		/// </summary>

		public GeneratePlaylist()

		{

			InitializeComponent();



			foreach (PlaylistData p in SettingsManager.Playlists)

			{

				Lists.Items.Add(new ComboBoxItem() { Content = p.Name });

			}



			if (SettingsManager.CurrentSelectedNavigation.StartsWith("Playlist:"))

			{

				string name = SettingsManager.CurrentSelectedNavigation.Split(new[] { ':' }, 2)[1];

				foreach (ComboBoxItem cbi in Lists.Items)

					if ((string)cbi.Content == name)

					{

						cbi.IsSelected = true;

						break;

					}

			}

			else

			{

				Lists.SelectedIndex = 0;

				Lists_SelectionChanged(null, null);

			}

		}



		#endregion



		#region Methods



		#region Private



		/// <summary>

		/// Gets the corresponding collection of tracks given the selected list.

		/// </summary>

		/// <returns>The collection of tracks corresponding to the selected list</returns>

		private ObservableCollection<TrackData> GetTracks()

		{

			if (Lists.SelectedIndex > 0)

			{

				ComboBoxItem cbi = Lists.SelectedItem as ComboBoxItem;

				PlaylistData p = PlaylistManager.FindPlaylist((string)cbi.Content);

				if (p != null)

					return p.Tracks;

				else

					return new ObservableCollection<TrackData>();

			}

			else

				return SettingsManager.FileTracks;

		}



		/// <summary>

		/// Tries to turn the number into an integer.

		/// If conversion fails or number is too large or too

		/// small -1 is returned and the proper error message is

		/// displayed.

		/// </summary>

		private int GetNumber()

		{

			string txt = Number.Text;

			try

			{

				int n = Convert.ToInt32(txt);

				int m = GetTracks().Count;

				if (n < 1)

				{

					ErrorMessage.Text = String.Format(U.T("DialogNumberTooSmall"), 0);

					ErrorMessage.Visibility = System.Windows.Visibility.Visible;

					return -1;

				}

				if (n > m)

				{

					ErrorMessage.Text = String.Format(U.T("DialogNumberTooLarge"), m+1);

					ErrorMessage.Visibility = System.Windows.Visibility.Visible;

					return -1;

				}

				else

					return n;

			}

			catch

			{

				ErrorMessage.Text = U.T("DialogNumberInvalid");

				ErrorMessage.Visibility = System.Windows.Visibility.Visible;

				return -1;

			}

		}



		#endregion



		#region Event handlers



		/// <summary>

		/// Invoked when the user clicks "Generate".

		/// </summary>

		/// <remarks>

		/// Will verify the name and generate a playlist.

		/// </remarks>

		/// <param name="sender">The sender of the event</param>

		/// <param name="e">The event data</param>

		private void Generate_Click(object sender, RoutedEventArgs e)

		{

			Regex alphaNumPattern = new Regex("[^a-zA-Z0-9 ]");

			if (alphaNumPattern.IsMatch(ListName.Text))

			{

				ErrorMessage.Text = U.T("DialogNameInvalidError");

				ErrorMessage.Visibility = System.Windows.Visibility.Visible;

			}

			else if (ListName.Text == "")

			{

				ErrorMessage.Text = U.T("DialogNameEmptyError");

				ErrorMessage.Visibility = System.Windows.Visibility.Visible;

			}

			else if (PlaylistManager.FindPlaylist(ListName.Text) != null)

			{

				ErrorMessage.Text = U.T("DialogNameExistsError");

				ErrorMessage.Visibility = System.Windows.Visibility.Visible;

			}

			else

			{

				// copy tracks to temporary list

				List<TrackData> tracks = new List<TrackData>();

				foreach (TrackData t in GetTracks())

					tracks.Add(t);



				int n = GetNumber();

				if (n < 0) return;



				if (tracks.Count > 0)

				{

					// create empty playlist

					PlaylistData p = PlaylistManager.CreatePlaylist(ListName.Text);

					if (p != null)

					{

						// move tracks from temporary list into playlist

						for (int i = 0; i < n && tracks.Count > 0; i++)

						{

							Random r = new Random();

							int x = r.Next(tracks.Count - 1);

							TrackData t = tracks[x];

							p.Tracks.Add(t);

							tracks.RemoveAt(x);

						}

					}

				}



				Close();

			}

		}



		/// <summary>

		/// Invoked when the user selects a list.

		/// </summary>

		/// <remarks>

		/// Will fill the Number control with 1 through "number of tracks in list"

		/// </remarks>

		/// <param name="sender">The sender of the event</param>

		/// <param name="e">The event data</param>

		private void Lists_SelectionChanged(object sender, SelectionChangedEventArgs e)

		{

			if (Number == null) return;

			Number.Text = GetTracks().Count.ToString();

		}



		#endregion



		#endregion

	}

}