/***************************************************************************
 *   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          *
 ***************************************************************************/

// 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 "util/base/exception.h"
#include "util/log/logger.h"

#include "soundclip.h"

namespace FIFE {
	static Logger _log(LM_AUDIO);

	SoundClip::SoundClip(SoundDecoder* decptr, bool deletedecoder) : m_location(ResourceLocation("")), m_isstream(decptr->needsStreaming()), m_decoder(decptr), m_deletedecoder(deletedecoder) {
		if (!m_isstream) {
			
			// only for non-streaming buffers
			SoundBufferEntry* ptr = new SoundBufferEntry();
			
			// iterate the bufs and fill them with data
			for (int i = 0; i < BUFFER_NUM; i++) {
				
				if (m_decoder->decode(BUFFER_LEN)) {
					// EOF or error
					break;
				}
				
				// generate buffer and fill it with data
				alGenBuffers(1, &ptr->buffers[i]);
				
				alBufferData(ptr->buffers[i], m_decoder->getALFormat(), m_decoder->getBuffer(),
					m_decoder->getBufferSize(), m_decoder->getSampleRate());
				
				CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error copying data to buffers")
					
				ptr->usedbufs++;
			}
			
			m_decoder->releaseBuffer();
			
			// push the buffer information to the vector
			m_buffervec.push_back(ptr);
			
		}
	}
	
	unsigned int SoundClip::beginStreaming() {
		// create new sound buffer entry
		SoundBufferEntry* ptr = new SoundBufferEntry();
		ptr->usedbufs=0;
		alGenBuffers(BUFFER_NUM, ptr->buffers);

		CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error creating streaming-buffers")
		
		m_buffervec.push_back(ptr);
		
		return m_buffervec.size()-1;
	}
	
	bool SoundClip::setStreamPos(unsigned int streamid, SoundPositionType type, float value) {
		unsigned long pos = 0;
		
		// convert position to bytes
		switch (type) {
			case SD_BYTE_POS:
				pos = static_cast<unsigned long>(value);
				break;
			case SD_TIME_POS:
				value *= m_decoder->getSampleRate();
			case SD_SAMPLE_POS:
				pos = static_cast<unsigned long>((m_decoder->getBitResolution() / 8) * (m_decoder->isStereo() ? 2 : 1) * value);
				break;
		}
		
		if (pos > m_decoder->getDecodedLength()) {
			// EOF!
			return true;
		}
		
		// set cursor position
		m_buffervec.at(streamid)->deccursor = pos;
		return false;
	}
	
	float SoundClip::getStreamPos(unsigned int streamid, SoundPositionType type) {
		unsigned long pos = m_buffervec.at(streamid)->deccursor;
		switch(type) {
			case SD_BYTE_POS:
				return pos;
			case SD_SAMPLE_POS:
				return pos / (m_decoder->getBitResolution() / 8 * (m_decoder->isStereo() ? 2 : 1));
			case SD_TIME_POS:
				return pos / (m_decoder->getBitResolution() / 8 * (m_decoder->isStereo() ? 2 : 1) * m_decoder->getSampleRate());
		}
		return 0.0f;
	}
	
	void SoundClip::acquireStream(unsigned int streamid) {
		
		SoundBufferEntry* ptr = m_buffervec.at(streamid);
		
		for (int i = 0; i < BUFFER_NUM; i++) {
			getStream(streamid, ptr->buffers[i]);
		}
	}
	
	bool SoundClip::getStream(unsigned int streamid, ALuint buffer) {
		
		SoundBufferEntry* ptr = m_buffervec.at(streamid);
		
		if (ptr->deccursor >= m_decoder->getDecodedLength()) {
			// EOF!
			return true;
		}
		
		// set cursor of decoder
		m_decoder->setCursor(ptr->deccursor);

		// Error while decoding file?
		if (m_decoder->decode(BUFFER_LEN)) {
			throw Exception("error while reading from audio file");
		}

		// fill the buffer with data
		alBufferData(buffer, m_decoder->getALFormat(),
			m_decoder->getBuffer(), m_decoder->getBufferSize(), m_decoder->getSampleRate());
			
		m_decoder->releaseBuffer();
			
		// update cursor
		ptr->deccursor += BUFFER_LEN;

		CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error catching stream")
		
		return false;
	}
	
	void SoundClip::quitStreaming(unsigned int streamid) {
		// release the buffers
		SoundBufferEntry* ptr = m_buffervec.at(streamid);
		alDeleteBuffers(BUFFER_NUM, ptr->buffers);
		ptr->buffers[0] = 0;
	}
	
	SoundClip::~SoundClip() {
		if (m_isstream) {
			// erase all elements from the list
			std::vector<SoundBufferEntry*>::iterator it;
		
			for (it = m_buffervec.begin(); it != m_buffervec.end(); ++it) {
				if ((*it)->buffers[0] != 0) {
					alDeleteBuffers(BUFFER_NUM, (*it)->buffers);
				}
				delete (*it);
			}
			m_buffervec.clear();
		}
		else {
			// for non-streaming soundclips
			SoundBufferEntry* ptr = m_buffervec.at(0);
			
			for(unsigned int i = 0; i < ptr->usedbufs; i++) {
				alDeleteBuffers(1, &ptr->buffers[i]);
			}
		}

		// delete decoder
		if (m_deletedecoder && m_decoder != NULL) {
			delete m_decoder;
		}
	}
}