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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
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* Copyright (C) 2009-2011, IGG Team, LSIIT, University of Strasbourg           *
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*                                                                              *
* 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.           *
*                                                                              *
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* Web site: http://cgogn.u-strasbg.fr/                                         *
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* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/

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#ifndef _GL2_MAP_RENDER_
#define _GL2_MAP_RENDER_
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#define _USE_MATH_DEFINES
#include <cmath>

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#include <GL/glew.h>
#include <vector>
#include <list>
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#include <set>
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#include <utility>
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#include "Topology/generic/dart.h"
#include "Topology/generic/functor.h"
#include "Topology/generic/attributeHandler.h"
#include "Container/convert.h"
#include "Geometry/vector_gen.h"

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#include "Utils/vbo.h"

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// forward definition
namespace CGoGN { namespace Utils { class GLSLShader; } }
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namespace CGoGN
{

namespace Algo
{

namespace Render
{

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namespace GL2
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{

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enum drawingType
{
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	TRIANGLES = 1,
	LINES = 2,
	POINTS = 4,
	EXPLODED = 8,
	FLAT_TRIANGLES = 16,
	ERR = 32
} ;

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enum bufferIndex
{
	POINT_INDICES = 0,
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	LINE_INDICES = 1,
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	TRIANGLE_INDICES = 2,
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	FLAT_BUFFER = 3,
	SIZE_BUFFER
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} ;


class MapRender
{

protected:
	/**
	 * vbo buffers
	 */
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	GLuint m_indexBuffers[SIZE_BUFFER] ;
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	/**
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	 * nb indices
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	 */
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	GLuint m_nbIndices[SIZE_BUFFER] ;

	typedef std::pair<GLuint*, unsigned int> buffer_array;
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	// forward declaration
	class VertexPoly;
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	// comparaison function for multiset
	static bool cmpVP(VertexPoly* lhs, VertexPoly* rhs);
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	// multiset typedef for simple writing
	typedef std::multiset< VertexPoly*,bool(*)(VertexPoly*,VertexPoly*)> VPMS;
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	class VertexPoly
	{
	public:
		int id;
		float value;
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		float length;
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		VertexPoly* prev;
		VertexPoly* next;
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		VPMS::iterator ear;
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		VertexPoly(int i, float v, float l, VertexPoly* p=NULL): id(i),value(v), length(l), prev(p), next(NULL)
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		{
			if (prev!=NULL)
				prev->next = this;
		}

		static void close(VertexPoly* first, VertexPoly* last)
		{
			last->next = first;
			first->prev = last;
		}

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		static VertexPoly* erase(VertexPoly* vp)
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		{
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			VertexPoly* tmp = vp->prev;
			tmp->next = vp->next;
			vp->next->prev = tmp;
			delete vp;
			return tmp;
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		}

	};



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public:
	/**
	 * Constructor
	 */
	MapRender() ;

	/**
	 * Constructor that share vertices attributes vbo (position/normals/colors...)
	 */
	MapRender(const MapRender& mrvbo);

	/**
	 * Destructor
	 */
	~MapRender() ;

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	buffer_array get_index_buffer() { return std::make_pair(m_indexBuffers, SIZE_BUFFER); }
	buffer_array get_nb_index_buffer() { return std::make_pair(m_nbIndices, SIZE_BUFFER); }

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protected:
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	/**
	 * addition of indices table of one triangle
	 * @param d a dart of the triangle
	 * @param tableIndices the indices table
	 */
	template <typename PFP>
	void addTri(typename PFP::MAP& map, Dart d, std::vector<GLuint>& tableIndices) ;

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	template<typename PFP>
	inline void addEarTri(typename PFP::MAP& map, Dart d, std::vector<GLuint>& tableIndices);

	template<typename PFP>
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	float computeEarAngle(const typename PFP::VEC3& P1, const typename PFP::VEC3& P2, const typename PFP::VEC3& P3, const typename PFP::VEC3& normalPoly);
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	template<typename PFP>
	bool computeEarIntersection(AttributeHandler<typename PFP::VEC3>& position, VertexPoly* vp, const typename PFP::VEC3& normalPoly);

	template<typename PFP>
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	void recompute2Ears( AttributeHandler<typename PFP::VEC3>& position, VertexPoly* vp, const typename PFP::VEC3& normalPoly, VPMS& ears, bool convex);
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	template<typename VEC3>
	bool inTriangle(const VEC3& P, const VEC3& normal, const VEC3& Ta,  const VEC3& Tb, const VEC3& Tc);
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public:
	/**
	 * creation of indices table of triangles (optimized order)
	 * @param tableIndices the table where indices are stored
	 */
	template <typename PFP>
	void initTriangles(typename PFP::MAP& map, const FunctorSelect& good,std::vector<GLuint>& tableIndices, unsigned int thread=0) ;
	template <typename PFP>
	void initTrianglesOptimized(typename PFP::MAP& map, const FunctorSelect& good,std::vector<GLuint>& tableIndices, unsigned int thread=0) ;

	/**
	 * creation of indices table of lines (optimized order)
	 * @param tableIndices the table where indices are stored
	 */
	template <typename PFP>
	void initLines(typename PFP::MAP& map, const FunctorSelect& good,std::vector<GLuint>& tableIndices, unsigned int thread=0) ;
	template <typename PFP>
	void initLinesOptimized(typename PFP::MAP& map, const FunctorSelect& good,std::vector<GLuint>& tableIndices, unsigned int thread=0) ;

	/**
	 * creation of indices table of points
	 * @param tableIndices the table where indices are stored
	 */
	template <typename PFP>
	void initPoints(typename PFP::MAP& map, const FunctorSelect& good,std::vector<GLuint>& tableIndices, unsigned int thread=0) ;

	/**
	 * initialization of the VBO indices primitives
	 * computed by a traversal of the map
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	 * @param prim primitive to draw: POINTS, LINES, TRIANGLES
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	 */
	template <typename PFP>
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	void initPrimitives(typename PFP::MAP& map, const FunctorSelect& good, int prim, bool optimized = true, unsigned int thread = 0) ;
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	/**
	 * initialization of the VBO indices primitives
	 * using the given table
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	 * @param prim primitive to draw: POINTS, LINES, TRIANGLES
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	 */
	void initPrimitives(int prim, std::vector<GLuint>& tableIndices) ;

	/**
	 * draw the VBO (function to call in the drawing callback)
	 */
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	void draw(Utils::GLSLShader* sh, int prim) ;
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	unsigned int drawSub(Utils::GLSLShader* sh, int prim, unsigned int nb_elm);
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} ;

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} // namespace GL2
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} // namespace Render

} // namespace Algo

} // namespace CGoGN

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#include "Algo/Render/GL2/mapRender.hpp"
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#endif