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

Copyright (c) 2006-2008, 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,
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----------------------------------------------------------------------
*/

/** Small helper classes to optimise finding vertizes close to a given location
 */
#ifndef AI_D3DSSPATIALSORT_H_INC
#define AI_D3DSSPATIALSORT_H_INC

#include <vector>
#include "../include/aiVector3D.h"


#if (!defined AI_BUILD_NO_ASE_IMPORTER)
#	include "3DSHelper.h"
#endif

namespace Assimp
{

using namespace Dot3DS;

// ------------------------------------------------------------------------------------------------
/** Specialized version of SpatialSort to support smoothing groups
 *  This is used in the .3ds loader
 */
class D3DSSpatialSorter
{
public:

	D3DSSpatialSorter();

	// -------------------------------------------------------------------
	/** Construction from a given face array, handling smoothing groups properly
	 */
	D3DSSpatialSorter(const std::vector<aiVector3D>& vPositions);

	// -------------------------------------------------------------------
	/** Add a face to the spatial sorter
	 * @param pcFace Face to be added
	 * @param vPositions Input position list
	 */
	void AddFace(const Dot3DS::Face* pcFace,
		const std::vector<aiVector3D>& vPositions);

	// -------------------------------------------------------------------
	/** Prepare the spatial sorter for use
	 */
	void Prepare();

	/** Destructor */
	~D3DSSpatialSorter();

	// -------------------------------------------------------------------
	/** Returns an iterator for all positions close to the given position.
	 * @param pPosition The position to look for vertices.
	 * @param pSG Only included vertices with at least one shared smooth group
	 * @param pRadius Maximal distance from the position a vertex may have to be counted in.
	 * @param poResults The container to store the indices of the found positions. Will be emptied
	 *   by the call so it may contain anything.
	 * @return An iterator to iterate over all vertices in the given area.
	 */
	void FindPositions( const aiVector3D& pPosition, uint32_t pSG,
		float pRadius, std::vector<unsigned int>& poResults) const;

protected:
	/** Normal of the sorting plane, normalized. The center is always at (0, 0, 0) */
	aiVector3D mPlaneNormal;

	// -------------------------------------------------------------------
	/** An entry in a spatially sorted position array. Consists of a vertex index,
	 * its position and its precalculated distance from the reference plane */
	struct Entry
	{
		unsigned int mIndex; ///< The vertex referred by this entry
		aiVector3D mPosition; ///< Position
		uint32_t mSmoothGroups;
		float mDistance; ///< Distance of this vertex to the sorting plane

		Entry() { /** intentionally not initialized.*/ }
		Entry( unsigned int pIndex, const aiVector3D& pPosition, float pDistance,uint32_t pSG) 
			: 
			mPosition( pPosition), mIndex( pIndex), mDistance( pDistance),mSmoothGroups (pSG)
			{ 	}

		bool operator < (const Entry& e) const { return mDistance < e.mDistance; }
	};

	// all positions, sorted by distance to the sorting plane
	std::vector<Entry> mPositions;
};

} // end of namespace Assimp

#endif // AI_SPATIALSORT_H_INC