/*
---------------------------------------------------------------------------
Free Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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* Redistributions of source code must retain the above
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  following disclaimer.

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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/

/** @file Implementation of the MD4 importer class */
#include "MD4Loader.h"
#include "MaterialSystem.h"

#include "../include/IOStream.h"
#include "../include/IOSystem.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"
#include "../include/aiAssert.h"

#include <boost/scoped_ptr.hpp>

using namespace Assimp;

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
MD4Importer::MD4Importer()
{
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
MD4Importer::~MD4Importer()
{
}
// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool MD4Importer::CanRead( const std::string& pFile, IOSystem* pIOHandler) const
{
	// simple check of file extension is enough for the moment
	std::string::size_type pos = pFile.find_last_of('.');
	// no file extension - can't read
	if( pos == std::string::npos)
		return false;
	std::string extension = pFile.substr( pos);

	if (extension.length() < 4)return false;
	if (extension[0] != '.')return false;

	// not brilliant but working ;-)
	if( extension == ".md4" || extension == ".MD4" || 
		extension == ".mD4" || extension == ".Md4")
	{
		return true;
	}
#if (!defined AI_MD4_DONT_SUPPORT_RAVENSOFT_MDR)
	if (extension[1] != 'm' && extension[1] != 'M')return false;
	if (extension[2] != 'd' && extension[2] != 'D')return false;
	if (extension[3] != 'r' && extension[3] != 'R')return false;
#endif

	return true;
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void MD4Importer::InternReadFile( 
	const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile));

	// Check whether we can read from the file
	if( file.get() == NULL)
	{
		throw new ImportErrorException( "Failed to open md4/mdr file " + pFile + ".");
	}

	// check whether the md4 file is large enough to contain
	// at least the file header
	size_t fileSize = file->FileSize();
	if( fileSize < sizeof(MD4::Header))
	{
		throw new ImportErrorException( ".mdd File is too small.");
	}
	return;
}