/*
 * CameraManager.cs
 * Authors: Bradley Blankenship
 * 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 System.Collections;

namespace tAC_Engine.Graphics.Cameras
{
	/// <summary>
	/// Manages all the various cameras that are used
	/// </summary>
	public static class CameraManager
	{
		#region Fields

		// The dictionary of all cameras
		private static Dictionary<int, Camera> mCameras =
			new Dictionary<int, Camera>();

		#endregion

		#region Content Tasks

		/// <summary>
		/// UnloadCameras - Removes all cameras from the Camera manager.
		/// </summary>
		public static void UnloadCameras()
		{
			// Clear all of the cameras
			mCameras.Clear();
		}

		#endregion

		#region Collection Tasks

		/// <summary>
		/// RegisterCamera - Registers the given camera with the manager.
		/// </summary>
		/// <param name="camera">The camera to register</param>
		/// <returns>The key value to get the camera back</returns>
		public static int RegisterCamera(Camera camera)
		{
			// The return value
			int retVal = mCameras.Count;

			// Register the camera as the next item in the list
			mCameras.Add(retVal, camera);

			// Return the int value for the key for the camera
			return retVal;
		}

		/// <summary>
		/// RegisterCamera - Registers the given camera with the manager.
		/// </summary>
		/// <param name="key">The key to use for the camera</param>
		/// <param name="camera">The camera to register</param>
		public static void RegisterCamera(int key, Camera camera)
		{
			// Register the camera as the next item in the list
			mCameras.Add(key, camera);
		}

		/// <summary>
		/// UnregisterCamera - Remove the given camera from the manager,
		///                    using the key
		/// </summary>
		/// <param name="camKey">The key for the camera</param>
		/// <returns>Whether it was removed or not</returns>
		public static bool UnregisterCamera(int camKey)
		{
			// Unregister the camera
			return mCameras.Remove(camKey);
		}

		/// <summary>
		/// GetCamera - Gets the camera that's wanted.
		/// </summary>
		/// <param name="camKey">The key for the required camera</param>
		public static Camera GetCamera(int camKey)
		{
			// The return value
			Camera retVal = null;

			// Now get the value
			if (mCameras.ContainsKey(camKey))
				retVal = mCameras[camKey];

			// Return the value
			return retVal;
		}

		/// <summary>
		/// CameraCount - Returns the number of cameras
		/// </summary>
		/// <returns>The number of cameras</returns>
		public static int CameraCount()
		{
			// Return the number of cameras
			return mCameras.Count;
		}

		#endregion
	}
}