/** Defines the collada loader class */

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

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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* Redistributions in binary form must reproduce the above
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

#ifndef AI_COLLADALOADER_H_INC
#define AI_COLLADALOADER_H_INC

#include "BaseImporter.h"
#include "ColladaParser.h"

namespace Assimp
{

struct ColladaMeshIndex
{
	std::string mMeshID;
	size_t mSubMesh;
	std::string mMaterial;
	ColladaMeshIndex( const std::string& pMeshID, size_t pSubMesh, const std::string& pMaterial) 
		: mMeshID( pMeshID), mSubMesh( pSubMesh), mMaterial( pMaterial)
	{   }

	bool operator < (const ColladaMeshIndex& p) const
	{
		if( mMeshID == p.mMeshID) 
		{
			if( mSubMesh == p.mSubMesh)
				return mMaterial < p.mMaterial;
			else 
				return mSubMesh < p.mSubMesh;
		} else
		{
			return mMeshID < p.mMeshID;
		}
	}
};

/** Loader class to read Collada scenes. Collada is over-engineered to death, with every new iteration bringing
 * more useless stuff, so I limited the data to what I think is useful for games. 
*/
class ColladaLoader : public BaseImporter
{
	friend class Importer;

protected:
	/** Constructor to be privately used by Importer */
	ColladaLoader();

	/** Destructor, private as well */
	~ColladaLoader();

public:
	/** Returns whether the class can handle the format of the given file. 
	 * See BaseImporter::CanRead() for details.	*/
	bool CanRead( const std::string& pFile, IOSystem* pIOHandler) const;

protected:
	/** Called by Importer::GetExtensionList() for each loaded importer.
	 * See BaseImporter::GetExtensionList() for details
	 */
	void GetExtensionList( std::string& append)
	{
		append.append("*.dae");
	}

	/** Imports the given file into the given scene structure. 
	 * See BaseImporter::InternReadFile() for details
	 */
	void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler);

	/** Recursively constructs a scene node for the given parser node and returns it. */
	aiNode* BuildHierarchy( const ColladaParser& pParser, const Collada::Node* pNode);

	/** Builds meshes for the given node and references them */
	void BuildMeshesForNode( const ColladaParser& pParser, const Collada::Node* pNode, aiNode* pTarget);

	/** Stores all meshes in the given scene */
	void StoreSceneMeshes( aiScene* pScene);

	/** Constructs materials from the collada material definitions */
	void BuildMaterials( const ColladaParser& pParser, aiScene* pScene);

	/** Resolves the texture name for the given effect texture entry */
	const aiString& FindFilenameForEffectTexture( const ColladaParser& pParser, const Collada::Effect& pEffect, const std::string& pName);

	/** Converts a path read from a collada file to the usual representation */
	void ConvertPath (aiString& ss);

protected:
	/** Filename, for a verbose error message */
	std::string mFileName;

	/** Which mesh-material compound was stored under which mesh ID */
	std::map<ColladaMeshIndex, size_t> mMeshIndexByID;

	/** Which material was stored under which index in the scene */
	std::map<std::string, size_t> mMaterialIndexByName;

	/** Accumulated meshes for the target scene */
	std::vector<aiMesh*> mMeshes;
};

} // end of namespace Assimp

#endif // AI_COLLADALOADER_H_INC