#region File Description
//-----------------------------------------------------------------------------
// CreateOrFindSessionScreen.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
#endregion

#region Using Statements
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.GamerServices;

#endregion

namespace NetworkStateManagement
{
	/// <summary>
	/// This menu screen lets the user choose whether to create a new
	/// network session, or search for an existing session to join.
	/// </summary>
	class CreateOrFindSessionScreen : MenuScreen
	{
	#region Fields

		NetworkSessionType sessionType;

	#endregion

	#region Initialization


		/// <summary>
		/// Constructor fills in the menu contents.
		/// </summary>
		public CreateOrFindSessionScreen (NetworkSessionType sessionType)
		: base(GetMenuTitle(sessionType))
			{
			this.sessionType = sessionType;

			// Create our menu entries.
			MenuEntry createSessionMenuEntry = new MenuEntry (Resources.CreateSession);
			MenuEntry findSessionsMenuEntry = new MenuEntry (Resources.FindSessions);
			MenuEntry backMenuEntry = new MenuEntry (Resources.Back);

			// Hook up menu event handlers.
			createSessionMenuEntry.Selected += CreateSessionMenuEntrySelected;
			findSessionsMenuEntry.Selected += FindSessionsMenuEntrySelected;
			backMenuEntry.Selected += OnCancel;

			// Add entries to the menu.
			MenuEntries.Add (createSessionMenuEntry);
			MenuEntries.Add (findSessionsMenuEntry);
			MenuEntries.Add (backMenuEntry);
		}


		/// <summary>
		/// Helper chooses an appropriate menu title for the specified session type.
		/// </summary>
		static string GetMenuTitle (NetworkSessionType sessionType)
		{
			switch (sessionType) {
			case NetworkSessionType.PlayerMatch:
				return Resources.PlayerMatch;

			case NetworkSessionType.SystemLink:
				return Resources.SystemLink;

			default:
				throw new NotSupportedException ();
			}
		}


	#endregion

	#region Event Handlers


		/// <summary>
		/// Event handler for when the Create Session menu entry is selected.
		/// </summary>
		void CreateSessionMenuEntrySelected (object sender, PlayerIndexEventArgs e)
		{
			try			{
				// Which local profiles should we include in this session?
				IEnumerable<SignedInGamer> localGamers = 
			NetworkSessionComponent.ChooseGamers (sessionType, 
							ControllingPlayer.Value);

				// Begin an asynchronous create network session operation.
				IAsyncResult asyncResult = NetworkSession.BeginCreate (
						sessionType, localGamers, 
						NetworkSessionComponent.MaxGamers, 
						0, null, null, null);

				// Activate the network busy screen, which will display
				// an animation until this operation has completed.
				NetworkBusyScreen busyScreen = new NetworkBusyScreen (asyncResult);

				busyScreen.OperationCompleted += CreateSessionOperationCompleted;

				ScreenManager.AddScreen (busyScreen, ControllingPlayer);
			} catch (Exception exception) {
				NetworkErrorScreen errorScreen = new NetworkErrorScreen (exception);

				ScreenManager.AddScreen (errorScreen, ControllingPlayer);
			}
		}

		enum SessionProperty{ GameMode, SkillLevel, ScoreToWin }
		
		enum GameMode{ Practice, Timed, CaptureTheFlag }
		
		enum SkillLevel{ Beginner, Intermediate, Advanced }
		
		/// <summary>
		/// Event handler for when the asynchronous create network session
		/// operation has completed.
		/// </summary>
		void CreateSessionOperationCompleted (object sender,
					OperationCompletedEventArgs e)
		{
			try			{
				// End the asynchronous create network session operation.
				NetworkSession networkSession = NetworkSession.EndCreate (e.AsyncResult);
				
				// Create a component that will manage the session we just created.
				NetworkSessionComponent.Create (ScreenManager, networkSession);

				// Go to the lobby screen. We pass null as the controlling player,
				// because the lobby screen accepts input from all local players
				// who are in the session, not just a single controlling player.
				ScreenManager.AddScreen (new LobbyScreen (networkSession), null);
			} catch (Exception exception) {
				NetworkErrorScreen errorScreen = new NetworkErrorScreen (exception);

				ScreenManager.AddScreen (errorScreen, ControllingPlayer);
			}
		}


		/// <summary>
		/// Event handler for when the Find Sessions menu entry is selected.
		/// </summary>
		void FindSessionsMenuEntrySelected (object sender, PlayerIndexEventArgs e)
		{
			try			{
				// Which local profiles should we include in this session?
				IEnumerable<SignedInGamer> localGamers = 
			NetworkSessionComponent.ChooseGamers (sessionType, 
							ControllingPlayer.Value);

				// Begin an asynchronous find network sessions operation.
				IAsyncResult asyncResult = NetworkSession.BeginFind (sessionType, 
							localGamers, null, null, null);

				// Activate the network busy screen, which will display
				// an animation until this operation has completed.
				NetworkBusyScreen busyScreen = new NetworkBusyScreen (asyncResult);

				busyScreen.OperationCompleted += FindSessionsOperationCompleted;

				ScreenManager.AddScreen (busyScreen, ControllingPlayer);
			} catch (Exception exception) {
				NetworkErrorScreen errorScreen = new NetworkErrorScreen (exception);

				ScreenManager.AddScreen (errorScreen, ControllingPlayer);
			}
		}


		/// <summary>
		/// Event handler for when the asynchronous find network sessions
		/// operation has completed.
		/// </summary>
		void FindSessionsOperationCompleted (object sender,
					OperationCompletedEventArgs e)
		{
			GameScreen nextScreen;

			try			{
				// End the asynchronous find network sessions operation.
				AvailableNetworkSessionCollection availableSessions = 
						NetworkSession.EndFind (e.AsyncResult);

				if (availableSessions.Count == 0) {
					// If we didn't find any sessions, display an error.
					availableSessions.Dispose ();

					nextScreen = new MessageBoxScreen (Resources.NoSessionsFound, false);
				} else {
					// If we did find some sessions, proceed to the JoinSessionScreen.
					nextScreen = new JoinSessionScreen (availableSessions);
				}
			} catch (Exception exception) {
				nextScreen = new NetworkErrorScreen (exception);
			}

			ScreenManager.AddScreen (nextScreen, ControllingPlayer);
		}


	#endregion
	}
}