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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_TRIANGLESETTOPOLOGYCONTAINER_H
#define SOFA_COMPONENT_TOPOLOGY_TRIANGLESETTOPOLOGYCONTAINER_H

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

namespace sofa
{

  namespace component
  {

    namespace topology
    {
      class TriangleSetTopologyModifier;

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

      typedef BaseMeshTopology::PointID			PointID;
      typedef BaseMeshTopology::EdgeID			EdgeID;
      typedef BaseMeshTopology::TriangleID		TriangleID;
      typedef BaseMeshTopology::Edge				Edge;
      typedef BaseMeshTopology::Triangle			Triangle;
      typedef BaseMeshTopology::SeqTriangles		SeqTriangles;
      typedef BaseMeshTopology::TriangleEdges		TriangleEdges;
      typedef BaseMeshTopology::VertexTriangles	VertexTriangles;
      typedef BaseMeshTopology::EdgeTriangles		EdgeTriangles;

      /*! \class TriangleSetTopologyContainer
	\brief: Object that stores a set of triangles and provides access
	to each triangle and its edges and vertices */
      class SOFA_COMPONENT_CONTAINER_API TriangleSetTopologyContainer : public EdgeSetTopologyContainer 
      {
	friend class TriangleSetTopologyModifier;

      public:

	TriangleSetTopologyContainer();

	TriangleSetTopologyContainer(const sofa::helper::vector< Triangle > &triangles );

	virtual ~TriangleSetTopologyContainer() {}

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

	virtual void init();

	virtual void draw();
		

	/// BaseMeshTopology API
	/// @{
	const SeqTriangles& getTriangles()
	{
	  return getTriangleArray();
	}

	/* Returns the indices of a triangle given three vertex indices : returns -1 if none */
	virtual int getTriangleIndex(PointID v1, PointID v2, PointID v3);

	/// Returns the set of edges adjacent to a given triangle.
	const TriangleEdges& getEdgeTriangleShell(TriangleID i)
	{
	  return getTriangleEdge(i);
	}

	/** \brief Returns the set of triangles adjacent to a given vertex.
	 *
	 */
	virtual const VertexTriangles& getTriangleVertexShell(PointID i);


	/** \brief Returns the set of triangles adjacent to a given edge.
	 *
	 */
	virtual const EdgeTriangles& getTriangleEdgeShell(EdgeID i) ;

	/** returns the index (either 0, 1 ,2) of the vertex whose global index is vertexIndex. Returns -1 if none */
	virtual int getVertexIndexInTriangle(const Triangle &t, PointID vertexIndex) const;

	/** returns the index (either 0, 1 ,2) of the edge whose global index is edgeIndex. Returns -1 if none */
	virtual int getEdgeIndexInTriangle(const TriangleEdges &t, EdgeID edgeIndex) const;

	/// @}

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

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

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

	/** \brief Returns the TriangleEdges array (ie provide the 3 edge indices for each triangle)
	 *
	 */
	const sofa::helper::vector< TriangleEdges > &getTriangleEdgeArray() ;

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

	/** \brief Returns the number of triangles in this topology.
	 *	The difference to getNbTriangles() is that this method does not generate the triangle array if it does not exist.
	 */
	unsigned int getNumberOfTriangles() const;


	/** \brief Returns the 3 edges adjacent to a given triangle.
	 *
	 */
	const TriangleEdges &getTriangleEdge(const unsigned int i) ;

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

	/** \brief Creates the EdgeSet array.
	 *
	 * Create the set of edges when needed. 
	 */
	virtual void createEdgeSetArray();
	
	/** \brief Creates the array of edge indices for each triangle 
	 *
	 * This function is only called if the TriangleEdge array is required.
	 * m_triangleEdge[i] contains the 3 indices of the 3 edges opposite to the ith vertex 
	 */
	void createTriangleEdgeArray();	

	/** \brief Creates the Triangle Vertex Shell Array
	 *
	 * This function is only called if the TriangleVertexShell array is required.
	 * m_triangleVertexShell[i] contains the indices of all triangles adjacent to the ith vertex 
	 */
	virtual void createTriangleVertexShellArray();

	/** \brief Creates the Triangle Edge Shell Array
	 *
	 * This function is only called if the TriangleVertexShell array is required.
	 * m_triangleEdgeShell[i] contains the indices of all triangles adjacent to the ith edge 
	 */
	virtual void createTriangleEdgeShellArray();

		
	bool hasTriangles() const;

	bool hasTriangleEdges() const;

	bool hasTriangleVertexShell() const;

	bool hasTriangleEdgeShell() const;

	void clearTriangles();

	void clearTriangleEdges();

	void clearTriangleVertexShell();

	void clearTriangleEdgeShell();

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

      protected:
	/// provides the set of triangles
	sofa::helper::vector<Triangle> m_triangle;
	DataPtr< sofa::helper::vector<Triangle> > d_triangle;
	/// provides the 3 edges in each triangle
	sofa::helper::vector<TriangleEdges> m_triangleEdge;
	/// for each vertex provides the set of triangles adjacent to that vertex
	sofa::helper::vector< sofa::helper::vector< unsigned int > > m_triangleVertexShell;
	/// for each edge provides the set of triangles adjacent to that edge
	sofa::helper::vector< sofa::helper::vector< unsigned int > > m_triangleEdgeShell;		

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

    } // namespace topology

  } // namespace component

} // namespace sofa

#endif