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/******************************************************************************
*       SOFA, Simulation Open-Framework Architecture, version 1.0 beta 4      *
*                (c) 2006-2009 MGH, INRIA, USTL, UJF, CNRS                    *
*                                                                             *
* This library is free software; you can redistribute it and/or modify it     *
* under the terms of the GNU Lesser General Public License as published by    *
* the Free Software Foundation; either version 2.1 of the License, or (at     *
* your option) any later version.                                             *
*                                                                             *
* This library 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 Lesser General Public License *
* for more details.                                                           *
*                                                                             *
* You should have received a copy of the GNU Lesser General Public License    *
* along with this library; if not, write to the Free Software Foundation,     *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.          *
*******************************************************************************
*                               SOFA :: Modules                               *
*                                                                             *
* Authors: The SOFA Team and external contributors (see Authors.txt)          *
*                                                                             *
* Contact information: contact@sofa-framework.org                             *
******************************************************************************/
#ifndef SOFA_COMPONENT_TOPOLOGY_QUADSETTOPOLOGYCONTAINER_H
#define SOFA_COMPONENT_TOPOLOGY_QUADSETTOPOLOGYCONTAINER_H

#include <sofa/component/topology/EdgeSetTopologyContainer.h>

namespace sofa
{
namespace component
{
namespace topology
{
	class QuadSetTopologyModifier;

	using core::componentmodel::topology::BaseMeshTopology;

	typedef BaseMeshTopology::PointID			PointID;
	typedef BaseMeshTopology::EdgeID			EdgeID;
	typedef BaseMeshTopology::QuadID			QuadID;
	typedef BaseMeshTopology::Edge				Edge;
	typedef BaseMeshTopology::Quad				Quad;
	typedef BaseMeshTopology::SeqQuads			SeqQuads;
	typedef BaseMeshTopology::QuadEdges			QuadEdges;
	typedef BaseMeshTopology::VertexQuads		VertexQuads;
	typedef BaseMeshTopology::EdgeQuads			EdgeQuads;

	/** Object that stores a set of quads and provides access 
	to each quad and its edges and vertices */
	class SOFA_COMPONENT_CONTAINER_API QuadSetTopologyContainer : public EdgeSetTopologyContainer 
	{
		friend class QuadSetTopologyModifier;
        
	public:
		QuadSetTopologyContainer();

		QuadSetTopologyContainer(const sofa::helper::vector< Quad >& quads );

		virtual ~QuadSetTopologyContainer() {}

		/// Procedural creation methods
		/// @{
		virtual void clear();
		virtual void addQuad( int a, int b, int c, int d );
		/// @}

		virtual void init();

		/// BaseMeshTopology API
		/// @{

		const SeqQuads& getQuads()   
		{ 
			return getQuadArray(); 
		}

		/// Returns the set of edges adjacent to a given quad.
		const QuadEdges& getEdgeQuadShell(QuadID i) 
		{ 
			return getQuadEdge(i); 
		}		

		/** \brief Returns the set of quads adjacent to a given vertex.
		*
		*/
		virtual const VertexQuads& getQuadVertexShell(PointID i);

		/** \brief Returns the set of quads adjacent to a given edge.
		*
		*/
		virtual const EdgeQuads& getQuadEdgeShell(EdgeID i);

		/** Returns the indices of a quad given four vertex indices : returns -1 if none */
		virtual int getQuadIndex(PointID v1, PointID v2, PointID v3, PointID v4);

		/// @}

		/** \brief Checks if the topology is coherent
		*
		* Check if the shell arrays are coherent
		*/
		virtual bool checkTopology() const;

		/** \brief Returns the Quad array.
		*
		*/
		const sofa::helper::vector<Quad> &getQuadArray();

		/** \brief Returns the Quad Vertex Shells array.
		*
		*/
		const sofa::helper::vector< sofa::helper::vector<unsigned int> > &getQuadVertexShellArray();

		/** \brief Returns the QuadEdges array (ie provide the 4 edge indices for each quad)
		*
		*/
		const sofa::helper::vector< QuadEdges > &getQuadEdgeArray() ;

		/** \brief Returns the Quad Edge Shells array (ie provides the quads adjacent to each edge)
		*
		*/
		const sofa::helper::vector< sofa::helper::vector<unsigned int> > &getQuadEdgeShellArray() ;

		/** \brief Returns the number of quads in this topology.
		*	The difference to getNbQuads() is that this method does not generate the quad array if it does not exist.
		*/
		unsigned int getNumberOfQuads() const;

		/** \brief Returns the 4 edges adjacent to a given quad.
		*
		*/
		const QuadEdges &getQuadEdge(const unsigned int i) ;

		/** returns the index (either 0, 1, 2, 3) of the vertex whose global index is vertexIndex. Returns -1 if none */
		int getVertexIndexInQuad(Quad &t,unsigned int vertexIndex) const;

		/** returns the index (either 0, 1, 2, 3) of the edge whose global index is edgeIndex. Returns -1 if none */
		int getEdgeIndexInQuad(QuadEdges &t,unsigned int edheIndex) const;

	protected:
		/** \brief Creates the QuadSet array.
		*
		* This function must be implemented by derived classes to create a list of quads from a set of hexahedra for instance
		*/
		virtual void createQuadSetArray();

		/** \brief Creates the EdgeSet array.
		*
		* Create the set of edges when needed. 
		*/
		virtual void createEdgeSetArray();

		bool hasQuads() const;

		bool hasQuadEdges() const;

		bool hasQuadVertexShell() const;

		bool hasQuadEdgeShell() const;

		void clearQuads();

		void clearQuadEdges();

		void clearQuadVertexShell();

		void clearQuadEdgeShell();

	private:
		/** \brief Creates the array of edge indices for each quad 
		*
		* This function is only called if the QuadEdge array is required.
		* m_quadEdge[i] contains the 4 indices of the 4 edges opposite to the ith vertex 
		*/
		void createQuadEdgeArray();

		/** \brief Creates the Quad Vertex Shell Array
		*
		* This function is only called if the QuadVertexShell array is required.
		* m_quadVertexShell[i] contains the indices of all quads adjacent to the ith vertex 
		*/
		void createQuadVertexShellArray();

		/** \brief Creates the Quad Edge Shell Array
		*
		* This function is only called if the QuadVertexShell array is required.
		* m_quadEdgeShell[i] contains the indices of all quads adjacent to the ith edge 
		*/
		void createQuadEdgeShellArray();

		/** \brief Returns a non-const quad vertex shell given a vertex index for subsequent modification 
		*
		*/
		sofa::helper::vector< unsigned int > &getQuadVertexShellForModification(const unsigned int vertexIndex); 

		/** \brief Returns a non-const quad edge shell given the index of an edge for subsequent modification 
		*
		*/
		sofa::helper::vector< unsigned int > &getQuadEdgeShellForModification(const unsigned int edgeIndex); 

	protected:
		/// provides the set of quads
		sofa::helper::vector<Quad> m_quad;
		DataPtr< sofa::helper::vector<Quad> > d_quad;
		/// provides the 4 edges in each quad
		sofa::helper::vector<QuadEdges> m_quadEdge;
		/// for each vertex provides the set of quads adjacent to that vertex
		sofa::helper::vector< sofa::helper::vector< unsigned int > > m_quadVertexShell;
		/// for each edge provides the set of quads adjacent to that edge
		sofa::helper::vector< sofa::helper::vector< unsigned int > > m_quadEdgeShell;

		virtual void loadFromMeshLoader(sofa::component::MeshLoader* loader);
	};

} // namespace topology

} // namespace component

} // namespace sofa

#endif