/***************************************************************************
 *   Copyright (C) 2005-2008 by the FIFE team                              *
 *   http://www.fifengine.de                                               *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

#ifndef FIFE_SOUNDMANAGER_H
#define FIFE_SOUNDMANAGER_H

// Standard C++ library includes

// Platform specific includes

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "fife_openal.h"

namespace FIFE {
	class SoundEmitter;
	class SoundClipPool;

	class SoundManager {
	public:
	
		SoundManager(SoundClipPool* pool);
		
		~SoundManager();
		
		/** Initializes the audio system
		 */
		void init();

		/** Returns a pointer to an emitter-instance given by emitterid
		 *
		 * @param emitterid The id of the Emitter
		 *
		 */
		SoundEmitter* getEmitter(unsigned int emitterid) const;
		
		/** Returns a pointer to an allocated emitter-instance
		 */
		SoundEmitter* createEmitter();
		
		/** Release an emitter-instance given by emitter-id
		 */
		void releaseEmitter(unsigned int emitterid);
		
		/** Returns an openAL context
		 */
		ALCcontext* getContext() const {
			return m_context;
		}
		
		/** Sets the Master Volume
		 * 
		 * @param vol The volume value. 0=silence ... 1.0=normal loudness.
		 */
		void setVolume(float vol) {
			if (m_device == NULL) {
				m_volume = vol;
			}
			alListenerf(AL_GAIN, vol);
		}

		/** Return the Master Volume
		*/
		float getVolume() const{
			return m_volume;
		}
		
		/** Mute
		 */
		void mute() {
			alGetListenerf(AL_GAIN, &m_mutevol);
			alListenerf(AL_GAIN, 0);
		}
		
		/** Unmutes to volume before mute() was called.
		 */
		void unmute() {
			alListenerf(AL_GAIN, m_mutevol);
		}
		
		/** Sets the position of the listener (alter ego).
		 */
		void setListenerPosition(float x, float y, float z) {
			alListener3f(AL_POSITION, x, y, z);
		}
		
		/** Sets the orientation of the listener (alter ego).
		 */
		void setListenerOrientation(float x, float y, float z) {
			ALfloat vec[6] = { x, y, z, 0.0, 0.0, 1.0};
			alListenerfv(AL_ORIENTATION, vec);
		}
		
		/** Sets the velocity of the listener (alter ego).
		 */
		void setListenerVelocity(float x, float y, float z);
		
		/** Returns true if audio module is active
		 */
		bool isActive() const{
			return m_device != NULL;
		}
		
	private:
	
		std::vector<SoundEmitter*> m_emittervec;	// emitter-vector
		ALCcontext*						m_context; 		// OpenAL context
		ALCdevice*						m_device; 		// OpenAL device
		SoundClipPool*				m_pool;
		float								m_mutevol;		// volume before mute() was called
		float								m_volume;		// volume to support setVolume-calls before initialization
	};
}
#endif