/*
 * GraphicsProfile.cs
 * Authors: Karl Orosz
 * Copyright (c) 2007-2008 Cornell University

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework;
using Util;

namespace tAC_Engine.Profile
{
	/// <summary>
	/// This class will store and apply settings to the graphics device
	/// </summary>
	class GraphicsProfile
	{
		#region Fields

		// Whether or not the screen is in fullscreen mode
		private bool mFullScreen;

		// The resolution of the screen
		private int[] mResolution = new int[2];

		// Reference to the current gamescreen
		private static GameScreen mGraphics;

		//Stores the current 
		private static GraphicsProfile mCurrent;

		//Stores the info for when the user is changing graphics settings.
		//This can be tossed away if the user cancels out of the graphics option screen.
		private static GraphicsProfile mChanged;

		#endregion

		#region Properties

		/// <summary>
		/// Gets/Sets whether or not the game is in fullscreen mode
		/// </summary>
		public static bool FullScreen
		{
			get
			{
				if (mChanged != null)
				{
					return mChanged.mFullScreen;
				}

				return mCurrent.mFullScreen;
			}
			set
			{
				if (mChanged != null)
				{
					mChanged.mFullScreen = value;
				}
				else
				{
					mCurrent.mFullScreen = value;
				}
			}
		}

		/// <summary>
		/// Gets/Sets the resolution of the screen
		/// </summary>
		public static int[] Resolution
		{
			get
			{
				if (mChanged != null)
				{
					return mChanged.mResolution;
				}

				return mCurrent.mResolution;
			}
			set
			{
				if (mChanged != null)
				{
					mChanged.mResolution = value;
				}
				else
				{
					mCurrent.mResolution = value;
				}
			}
		}

		/// <summary>
		/// Gets the graphics device manager
		/// </summary>
		public static GraphicsDeviceManager GraphicsDeviceManager { get { return mGraphics.GraphicsDeviceManager; } }

		#endregion

		#region Creation

		/// <summary>
		/// Load default graphics settings. 
		/// todo: load them from a file
		/// </summary>
		public GraphicsProfile()
		{
			ResetToDefaults();
		}

		/// <summary>
		/// Creates a copy of the passed graphics profile
		/// </summary>
		/// <param name="copy">The graphics profile to copy</param>
		public GraphicsProfile(GraphicsProfile copy)
		{
			this.mFullScreen = copy.mFullScreen;
			mResolution = new int[2];
			mResolution[0] = copy.mResolution[0];
			mResolution[1] = copy.mResolution[1];
		}

		#endregion

		#region Initialization

		/// <summary>
		/// Sets up the graphics options for this profile
		/// </summary>
		/// <param name="g">Reference to the current gamescreen</param>
		public static void Initialize(GameScreen g)
		{
			mGraphics = g;
			mCurrent = new GraphicsProfile();
			ApplyToDevice(mCurrent);
		}

		#endregion

		#region Update Graphics

		/// <summary>
		/// Applies any grahical changes to the graphics device
		/// </summary>
		/// <param name="toBeApplied">Changes in the graphics profile to be applied</param>
		public static void ApplyToDevice(GraphicsProfile toBeApplied)
		{
			GraphicsDeviceManager gdm = GraphicsDeviceManager;

			if (gdm.IsFullScreen != toBeApplied.mFullScreen)
			{
				gdm.ToggleFullScreen();
			}

			gdm.PreferredBackBufferWidth = toBeApplied.mResolution[0];
			gdm.PreferredBackBufferHeight = toBeApplied.mResolution[1];

			gdm.ApplyChanges();
		}

		#endregion

		#region Profile Management

		/// <summary>
		/// Resets to the defulat values.  Varies based on rlease and debug 
		/// </summary>
		public void ResetToDefaults()
		{
#if DEBUG
			mFullScreen = false;
#else
            mFullScreen = true;
#endif
			mResolution[0] = 1024;
			mResolution[1] = 768;
		}

		/// <summary>
		/// Modifies the current graphics profile
		/// </summary>
		public static void Modify()
		{
			mChanged = new GraphicsProfile(mCurrent);
		}

		/// <summary>
		/// Applies the changes that were made recently
		/// </summary>
		public static void ApplyChanges()
		{
			ApplyToDevice(mChanged);
		}

		/// <summary>
		/// Saves all the changes that were made recently
		/// </summary>
		public static void SaveChanges()
		{
			mCurrent = mChanged;
			mChanged = null;
		}

		/// <summary>
		/// Cancels any changes that were made recently without saving
		/// </summary>
		public static void CancelChanges()
		{
			mChanged = null;
			ApplyToDevice(mCurrent);
		}

		#endregion
	}
}