//-----------------------------------------------------------------------------
// MainMenuScreen.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Net;

namespace CatapultGame
{
    class MainMenuScreen : MenuScreen
    {
        public MainMenuScreen()
            : base(String.Empty)
        {
            IsPopup = true;

            // Create our menu entries.
            MenuEntry startGameMenuEntry = new MenuEntry("Single Player vs AI");
            MenuEntry startMultiPlayerGameMenuEntry = new MenuEntry("Multi Player on LAN");
            MenuEntry exitMenuEntry = new MenuEntry("Exit");

            // Hook up menu event handlers.
            startGameMenuEntry.Selected += StartGameMenuEntrySelected;
            startMultiPlayerGameMenuEntry.Selected += StartMultiPlayerGameMenuEntrySelected;
            exitMenuEntry.Selected += OnCancel;

            // Add entries to the menu.
            MenuEntries.Add(startGameMenuEntry);
            MenuEntries.Add(startMultiPlayerGameMenuEntry);
            MenuEntries.Add(exitMenuEntry);
        }


        protected override void UpdateMenuEntryLocations()
        {
            base.UpdateMenuEntryLocations();

            foreach (var entry in MenuEntries)
            {
                Vector2 position = entry.Position;

                position.Y += 60;

                entry.Position = position;
            }
        }

        /// <summary>
        /// Handles "Play" menu item selection
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void StartGameMenuEntrySelected(object sender, EventArgs e)
        {
            // Lets make sure we get rid of our network session
            // so we can start up clean
            ScreenManager.Game.Services.RemoveService(typeof(NetworkSession));
            ScreenManager.AddScreen(new InstructionsScreen(), null);
        }

        /// <summary>
        /// Handles "Exit" menu item selection
        /// </summary>
        /// 
        protected override void OnCancel(PlayerIndex playerIndex)
        {
            ScreenManager.Game.Exit();
        }

        void StartMultiPlayerGameMenuEntrySelected(object sender, PlayerIndexEventArgs e)
        {
            CreateOrFindSession(NetworkSessionType.SystemLink, e.PlayerIndex);
        }

        /// <summary>
        /// Helper method shared by the Live and System Link menu event handlers.
        /// </summary>
        void CreateOrFindSession(NetworkSessionType sessionType, PlayerIndex playerIndex)
        {

            // First, we need to make sure a suitable gamer profile is signed in.
            ProfileSignInScreen profileSignIn = new ProfileSignInScreen(sessionType);

            // Hook up an event so once the ProfileSignInScreen is happy,
            // it will activate the CreateOrFindSessionScreen.
            profileSignIn.ProfileSignedIn += delegate
                {
                    GameScreen createOrFind = new CreateOrFindSessionScreen(sessionType);

                    ScreenManager.AddScreen(createOrFind, playerIndex);
                };

            // Activate the ProfileSignInScreen.
            ScreenManager.AddScreen(profileSignIn, playerIndex);
        }
    }
}