/* Copyright (C) 2012 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include "OggData.h"


#if CONFIG2_AUDIO

#include "ps/CLogger.h"
#include "ps/Filesystem.h"
#include "soundmanager/SoundManager.h"
#include "ps/CLogger.h"

COggData::COggData()
{
	m_OneShot = false;
	m_Format = 0;
	m_Frequency = 0;
	m_BuffersUsed = 0;
}

COggData::~COggData()
{
	AL_CHECK
	if (ogg)
		ogg->Close();

	AL_CHECK
	if ( m_BuffersUsed > 0 )
		alDeleteBuffers(m_BuffersUsed, &m_Buffer[0] );

	AL_CHECK
	m_BuffersUsed = 0;
}

void COggData::SetFormatAndFreq(int form, ALsizei freq)
{
	m_Format = form;
	m_Frequency = freq;
}

bool COggData::IsStereo()
{
	return ( m_Format == AL_FORMAT_STEREO16 );
}

bool COggData::InitOggFile(const VfsPath& itemPath)
{
  if ( CSoundManager* sndManager = (CSoundManager*)g_SoundManager )
  {
		int buffersToStart = sndManager->GetBufferCount();	
		if ( OpenOggNonstream( g_VFS, itemPath, ogg) == INFO::OK )
		{
			m_FileFinished = false;

			SetFormatAndFreq(ogg->Format(), ogg->SamplingRate() );
			SetFileName( itemPath );
		
			AL_CHECK
			
			alGenBuffers(buffersToStart, m_Buffer);
			
			if(alGetError() != AL_NO_ERROR) 
			{
				LOGERROR( L"- Error creating initial buffer !!\n");
				return false;
			}
			else
			{
				m_BuffersUsed = FetchDataIntoBuffer(buffersToStart, m_Buffer);
				if (m_FileFinished)
				{
					m_OneShot = true;
					if (m_BuffersUsed < buffersToStart)
					{
						alDeleteBuffers(buffersToStart - m_BuffersUsed, &m_Buffer[m_BuffersUsed]);
					}
				}
				AL_CHECK
			}
			return true;
	  }
		return false;
	}
	return false;
}

ALsizei COggData::GetBufferCount()
{
	return m_BuffersUsed;
}

bool COggData::IsFileFinished()
{
	return m_FileFinished;
}

void COggData::ResetFile()
{
	ogg->ResetFile();
	m_FileFinished = false;
}

bool COggData::IsOneShot()
{
	return m_OneShot;
}

int COggData::FetchDataIntoBuffer(int count, ALuint* buffers)
{
  if ( CSoundManager* sndManager = (CSoundManager*)g_SoundManager )
  {
		long bufferSize = sndManager->GetBufferSize();
		
		u8* pcmout = new u8[bufferSize + 5000];
		int buffersWritten = 0;
		
		for (int i = 0; (i < count) && !m_FileFinished; i++)
		{
			memset( pcmout, 0, bufferSize + 5000 );
			Status totalRet = ogg->GetNextChunk( pcmout, bufferSize);
			m_FileFinished = ogg->atFileEOF();
			if (totalRet > 0)
			{
				buffersWritten++;
				alBufferData(buffers[i], m_Format, pcmout, (ALsizei)totalRet, (int)m_Frequency);
			}
		}
		delete[] pcmout;
		return buffersWritten;
	}
	return 0;
}


ALuint COggData::GetBuffer()
{
	return m_Buffer[0];
}

ALuint* COggData::GetBufferPtr()
{
	return m_Buffer;
}

#endif // CONFIG2_AUDIO