/***************************************************************************
 *   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_SOUNDEMITTER_H_
#define FIFE_SOUNDEMITTER_H_

// Standard C++ library includes

// Platform specific includes

// 3rd party library includes
#include <boost/function.hpp>

// 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 "vfs/raw/rawdata.h"
#include "util/time/timeevent.h"

#include "soundclip.h"

namespace FIFE {

	class SoundManager;
	class SoundClipPool;

	/** The class for playing audio files
	 */
	class SoundEmitter : private TimeEvent {
	public:
		typedef boost::function0<void> type_callback;

		SoundEmitter(SoundManager* manager, SoundClipPool* pool, unsigned int uid);
		~SoundEmitter();

		/** Returns the emitter-id
		 */
		unsigned int getId() const{
			return m_emitterid;
		}

		/** Sets Positioning-Type
		 * Default is false
		 *
		 * @param relative If set to true, the emitters position will be interpreted relative to the listener object
		 *
		 */
		void setPositioning(bool relative) {
			alSourcei(m_source, AL_SOURCE_RELATIVE, relative ? AL_TRUE : AL_FALSE);
		}

		/** Sets the AL_ROLEOFF_FACTOR. Rolloff factor judges the strength of attenuation over distance.
		 *
		 * @param rolloff Rolloff factor. You'll need to do a lot of testing to find a value which suits your needs.
		 */
		void setRolloff(float rolloff) {
			alSourcef (m_source, AL_ROLLOFF_FACTOR,  rolloff);
		}

		/** Sets the sound clip to be used by this emitter.
		 * @param sound_id SoundClipPool id of the sound to be used.
		 */
		void setSoundClip(unsigned int sound_id);

		/** Sets the callback to use when the STREAM has finished being played.
		 *  NOTE: This only works with streaming audio.
		 *
		 * @param cb function callback
		 */
		void setCallback(const type_callback& cb);

		/** Reset the emitter, free all internal buffers
		 *
		 * @param defaultall If set to true, emitter position, velocity, gain and type will be set to the default values
		 */
		void reset(bool defaultall = false);

		/** Releases the emitter
		 */
		void release();

		/** Sets the playing mode
		 */
		void setLooping(bool loop);

		/** Plays the associated audio file.
		 */
		void play();

		/** Stops playing the audio file and rewinds to the beginning
		 */
		void stop();

		/** Pauses playing the audio file
		 */
		void pause() {
			if (m_soundclip) {
				alSourcePause(m_source);
			}
		}

		/** Sets the gain of the emitter
		 *
		 * @param gain The gain value. 0=silence ... 1.0=normal loudness.
		 */
		void setGain(float gain) {
			alSourcef(m_source, AL_GAIN, gain);
		}

		/** Returns the gain of the emitter
		 *
		 * @return The gain value. 0=silence ... 1.0=normal loudness.
		 */
		float getGain() {
			float tmp;
			alGetSourcef(m_source, AL_GAIN, &tmp);
			return tmp;
		}

		/** Tests if the audio data is stereo data or mono.
		 *
		 * @return Returns true if the audio data is stereo, false if mono.
		 */
		bool isStereo() const{
			if (m_soundclip) {
				return m_soundclip->getDecoder()->isStereo();
			}
			return false;
		}

		/** Returns the bit resolution
		 */
		short getBitResolution() const {
			if (m_soundclip) {
				return m_soundclip->getDecoder()->getBitResolution();
			}
			return 0;
		}

		/** Returns the sample rate
		 */
		unsigned long getSampleRate() const{
			if (m_soundclip) {
				return m_soundclip->getDecoder()->getSampleRate();
			}
			return 0;
		}

		/** Returns the length of the decoded length in bytes
		 */
		unsigned long getDecodedLength() const{
			if (m_soundclip) {
				return m_soundclip->getDecoder()->getDecodedLength();

			}
			return 0;
		}

		/** Returns the duration of the sound clip in milliseconds
		 */
		unsigned long getDuration() const{
			if (m_soundclip) {
				double samplerate = static_cast<double>(getSampleRate()) / 1000.0;  //convert to milliseconds
				double bitres = static_cast<double>(getBitResolution());
				double size = static_cast<double>(getDecodedLength()) * 8.0;  //convert to bits
				double stereo = (isStereo() ? 2.0 : 1.0);
				double time = ( size / (samplerate * bitres) ) / stereo;

				return static_cast<unsigned long>(time);
			}
			return 0;
		 }

		/** Sets the cursor position in the audio file
		 */
		void setCursor(SoundPositionType type, float value);

		/** Returns the cursor position in the audio file
		 */
		float getCursor(SoundPositionType type);

		/** Sets the position of the SoundEmitter in the virtual audio space.
		 */
		void setPosition(float x, float y, float z) {
			alSource3f(m_source, AL_POSITION, x, y, z);
		}

		/** Sets the velocity of the SoundEmitter in the virtual audio space.
		 */
		void setVelocity(float x, float y, float z) {
			alSource3f(m_source, AL_VELOCITY, x, y, z);
		}

	private:
		/** Implementation of the pure virtual function from TimeEvent to update streaming
		 */
		virtual void updateEvent(unsigned long time);

		/** Internal function to attach a soundclip to the source
		 */
		void attachSoundClip();

		SoundManager*	m_manager;
		SoundClipPool*	m_pool;
		ALuint			m_source;			// The openAL-source
		SoundClip*		m_soundclip;	// the attached soundclip
		unsigned int	m_soundclipid;// id of the attached soundclip
		unsigned int	m_streamid;		// the id of the stream
		unsigned int	m_emitterid;	// the emitter-id
		bool			m_loop;				// loop?
		type_callback 	m_callback;
	};
}

#endif