/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------

Copyright (c) 2006-2010, ASSIMP Development Team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/

/** @file Exporter.cpp

Assimp export interface. While it's public interface bears many similarities
to the import interface (in fact, it is largely symmetric), the internal
implementations differs a lot. Exporters are considered stateless and are
simple callbacks which we maintain in a global list along with their
description strings.
*/

#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_EXPORT

#include "DefaultIOStream.h"
#include "DefaultIOSystem.h"

namespace Assimp {

// ------------------------------------------------------------------------------------------------
// Exporter worker function prototypes. Should not be necessary to #ifndef them, it's just a prototype
void ExportSceneCollada(aiExportDataBlob*, const aiScene*);
void ExportScene3DS(aiExportDataBlob*, const aiScene*) { }

/// Function pointer type of a Export worker function
typedef void (*fpExportFunc)(aiExportDataBlob*, const aiScene*);

// ------------------------------------------------------------------------------------------------
/// Internal description of an Assimp export format option
struct ExportFormatEntry
{
	/// Public description structure to be returned by aiGetExportFormatDescription()
	aiExportFormatDesc mDescription;

	// Worker function to do the actual exporting
	fpExportFunc mExportFunction;

	// Constructor to fill all entries
	ExportFormatEntry( const char* pId, const char* pDesc, fpExportFunc pFunction)
	{
		mDescription.id = pId;
		mDescription.description = pDesc;
		mExportFunction = pFunction;
	}
};

// ------------------------------------------------------------------------------------------------
// global array of all export formats which Assimp supports in its current build
ExportFormatEntry gExporters[] = 
{
#ifndef ASSIMP_BUILD_NO_COLLADA_EXPORTER
	ExportFormatEntry( "collada", "Collada .dae", &ExportSceneCollada),
#endif

#ifndef ASSIMP_BUILD_NO_3DS_EXPORTER
	ExportFormatEntry( "3ds", "Autodesk .3ds", &ExportScene3DS),
#endif
};


class ExporterPimpl {
public:

	ExporterPimpl()
		: blob()
		, mIOSystem(new Assimp::DefaultIOSystem())
		, mIsDefaultIOHandler(true)
	{
		
	}

	~ExporterPimpl() 
	{
		delete blob;
	}

public:
		
	aiExportDataBlob* blob;
	boost::shared_ptr< Assimp::IOSystem > mIOSystem;
	bool mIsDefaultIOHandler;
};

} // end of namespace Assimp





using namespace Assimp;


// ------------------------------------------------------------------------------------------------
Exporter :: Exporter() 
: pimpl(new ExporterPimpl())
{
}


// ------------------------------------------------------------------------------------------------
Exporter :: ~Exporter()
{
	delete pimpl;
}


// ------------------------------------------------------------------------------------------------
void Exporter :: SetIOHandler( IOSystem* pIOHandler)
{
	pimpl->mIsDefaultIOHandler = !pIOHandler;
	pimpl->mIOSystem.reset(pIOHandler);
}


// ------------------------------------------------------------------------------------------------
IOSystem* Exporter :: GetIOHandler() const
{
	return pimpl->mIOSystem.get();
}


// ------------------------------------------------------------------------------------------------
bool Exporter :: IsDefaultIOHandler() const
{
	return pimpl->mIsDefaultIOHandler;
}


// ------------------------------------------------------------------------------------------------
const aiExportDataBlob* Exporter :: ExportToBlob(  const aiScene* pScene, const char* pFormatId )
{
	if (pimpl->blob) {
		delete pimpl->blob;
		pimpl->blob = NULL;
	}

	/* TODO (ALEX)

	boost::shared_ptr<IOSystem*> old = pimpl->mIOSystem;

	BlobIOSystem* blobio;
	pimpl->mIOSystem = blobio = new BlobIOSystem();

	if (AI_SUCCESS != Export(pScene,pFormatId)) {
		pimpl->mIOSystem = old;
		return NULL;
	}

	pimpl->blob = blobio->GetBlob();
	pimpl->mIOSystem = old;

	return pimpl->blob;
	*/
	return NULL;
}


// ------------------------------------------------------------------------------------------------
aiReturn Exporter :: Export( const aiScene* pScene, const char* pFormatId, const char* pPath )
{
	return AI_FAILURE;
}


// ------------------------------------------------------------------------------------------------
const aiExportDataBlob* Exporter :: GetBlob() const 
{
	return pimpl->blob;
}


// ------------------------------------------------------------------------------------------------
const aiExportDataBlob* Exporter :: GetOrphanedBlob() const 
{
	const aiExportDataBlob* tmp = pimpl->blob;
	pimpl->blob = NULL;
	return tmp;
}


// ------------------------------------------------------------------------------------------------
size_t Exporter :: aiGetExportFormatCount() const 
{
	return ::aiGetExportFormatCount();
}

// ------------------------------------------------------------------------------------------------
const aiExportFormatDesc* Exporter :: aiGetExportFormatDescription( size_t pIndex ) const 
{
	return ::aiGetExportFormatDescription(pIndex);
}



// ------------------------------------------------------------------------------------------------
ASSIMP_API size_t aiGetExportFormatCount(void)
{
	return sizeof( Assimp::gExporters) / sizeof( Assimp::ExportFormatEntry);
}


// ------------------------------------------------------------------------------------------------
ASSIMP_API const aiExportFormatDesc* aiGetExportFormatDescription( size_t pIndex)
{
	if( pIndex >= aiGetExportFormatCount() )
		return NULL;

	return &Assimp::gExporters[pIndex].mDescription;
}


// ------------------------------------------------------------------------------------------------
ASSIMP_API aiReturn aiExportScene( const aiScene* pScene, const char* pFormatId, const char* pFileName )
{
	return ::aiExportSceneEx(pScene,pFormatId,pFileName,NULL);
}


// ------------------------------------------------------------------------------------------------
ASSIMP_API aiReturn aiExportSceneEx( const aiScene* pScene, const char* pFormatId, const char* pFileName, const aiFileIO* pIO)
{
	return AI_FAILURE;
}



// ------------------------------------------------------------------------------------------------
ASSIMP_API const C_STRUCT aiExportDataBlob* aiExportSceneToBlob( const aiScene* pScene, const char* pFormatId )
{
	// find a suitable exporter
	const Assimp::ExportFormatEntry* exporter = NULL;
	for( size_t a = 0; a < aiGetExportFormatCount(); ++a )
	{
		if( strcmp( Assimp::gExporters[a].mDescription.id, pFormatId) == 0 )
			exporter = Assimp::gExporters + a;
	}
	
	if( !exporter )
		return NULL;

	aiExportDataBlob* blob = new aiExportDataBlob;
	exporter->mExportFunction( blob, pScene);
	if( !blob->data || blob->size == 0 )
	{
		delete blob;
		return NULL;
	}

	return blob;
}

// ------------------------------------------------------------------------------------------------
ASSIMP_API C_STRUCT void aiReleaseExportData( const aiExportDataBlob* pData )
{
	delete pData;
}

#endif // !ASSIMP_BUILD_NO_EXPORT