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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
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* Copyright (C) 2009-2013, IGG Team, ICube, 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.unistra.fr/                                           *
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* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/

namespace CGoGN
{

namespace Algo
{

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namespace Surface
{

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namespace Decimation
{

template <typename PFP>
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int decimate(
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	typename PFP::MAP& map, SelectorType s, ApproximatorType a,
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	std::vector<VertexAttribute<typename PFP::VEC3, typename PFP::MAP::IMPL>*>& attribs,
	unsigned int nbWantedVertices,
	EdgeAttribute<typename PFP::REAL, typename PFP::MAP::IMPL>* edgeErrors,
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	void (*callback_wrapper)(void*, const void*), void* callback_object
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)
{
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	assert(attribs.size() >= 1 || !"Decimate: not enough attribs provided") ;
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	assert(attribs[0]->name() == "position" || !"Decimate: first attribute should always be the position") ;
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	VertexAttribute<typename PFP::VEC3, typename PFP::MAP::IMPL> position = *(attribs[0]) ;
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	std::vector<ApproximatorGen<PFP>*> approximators ;
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	Selector<PFP>* selector = NULL ;
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	std::vector<VertexAttribute<typename PFP::VEC3, typename PFP::MAP::IMPL>*>* v_approx = NULL ;
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	switch(a)
	{
		case A_QEM :
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			approximators.push_back(new Approximator_QEM<PFP>(map, attribs)) ;
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			break ;
		case A_MidEdge :
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			approximators.push_back(new Approximator_MidEdge<PFP>(map, attribs)) ;
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			break ;
		case A_CornerCutting :
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			approximators.push_back(new Approximator_CornerCutting<PFP>(map, attribs)) ;
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			break ;
		case A_TangentPredict1 :
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			approximators.push_back(new Approximator_MidEdge<PFP>(map, attribs)) ;
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			break ;
		case A_TangentPredict2 :
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			approximators.push_back(new Approximator_MidEdge<PFP>(map, attribs)) ;
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			break ;
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		case A_NormalArea :
			approximators.push_back(new Approximator_NormalArea<PFP>(map, attribs)) ;
			break ;
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		case A_hHalfCollapse :
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			approximators.push_back(new Approximator_HalfCollapse<PFP>(map, attribs)) ;
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			break ;
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		case A_ColorNaive :
		{
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			v_approx = new std::vector<VertexAttribute<typename PFP::VEC3, typename PFP::MAP::IMPL>*>[2] ;
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			// pos
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			v_approx[0].push_back(attribs[0]) ;
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			approximators.push_back(new Approximator_QEM<PFP>(map, v_approx[0])) ;
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			// col
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			assert(attribs.size() >= 2 || !"Decimate: A_ColorNaive --> not enough attribs provided") ;
			v_approx[1].push_back(attribs[1]) ;
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			approximators.push_back(new Approximator_ColorNaive<PFP>(map, v_approx[1])) ;
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		}
		break ;
		case A_ColorQEMext :
		{
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			// pos + col
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			assert(attribs.size() >= 2 || !"Decimate: A_ColorQEMext --> not enough attribs provided") ;
			approximators.push_back(new Approximator_ColorQEMext<PFP>(map, attribs)) ;
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		}
		break;
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		case A_GeomColorOpt :
		{
			// pos + col
			assert(attribs.size() >= 2 || !"Decimate: A_GeomColorOpt --> not enough attribs provided") ;
			approximators.push_back(new Approximator_GeomColOpt<PFP>(map, attribs)) ;
		}
		break ;
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		case A_hQEM :
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			// pos
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			approximators.push_back(new Approximator_QEMhalfEdge<PFP>(map, attribs)) ;
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			break ;

		case A_OTHER:
			break;
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	}

	switch(s)
	{
		case S_MapOrder :
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			selector = new EdgeSelector_MapOrder<PFP>(map, position, approximators) ;
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			break ;
		case S_Random :
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			selector = new EdgeSelector_Random<PFP>(map, position, approximators) ;
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			break ;
		case S_EdgeLength :
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			selector = new EdgeSelector_Length<PFP>(map, position, approximators) ;
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			break ;
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		case S_QEMml :
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			selector = new EdgeSelector_QEMml<PFP>(map, position, approximators) ;
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			break ;
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		case S_QEM :
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			selector = new EdgeSelector_QEM<PFP>(map, position, approximators) ;
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			break ;
		case S_Curvature :
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			selector = new EdgeSelector_Curvature<PFP>(map, position, approximators) ;
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			break ;
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		case S_NormalArea :
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			selector = new EdgeSelector_NormalArea<PFP>(map, position, approximators) ;
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			break ;
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		case S_CurvatureTensor :
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			selector = new EdgeSelector_CurvatureTensor<PFP>(map, position, approximators) ;
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			break ;
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		case S_MinDetail :
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			selector = new EdgeSelector_MinDetail<PFP>(map, position, approximators) ;
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			break ;
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		case S_ColorNaive :
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			selector = new EdgeSelector_ColorNaive<PFP>(map, position, approximators) ;
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			break ;
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		case S_QEMextColor :
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			selector = new EdgeSelector_QEMextColor<PFP>(map, position, approximators) ;
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			break ;
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		case S_hQEMextColor :
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			selector = new HalfEdgeSelector_QEMextColor<PFP>(map, position, approximators) ;
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			break ;
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		case S_hQEMml :
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			selector = new HalfEdgeSelector_QEMml<PFP>(map, position, approximators) ;
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			break ;
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		case S_hColorGradient:
			selector = new HalfEdgeSelector_ColorGradient<PFP>(map, position, approximators) ;
			break ;
		case S_GeomColOptGrad:
			selector = new EdgeSelector_GeomColOptGradient<PFP>(map, position, approximators) ;
			break ;
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		case S_OTHER:
			break;
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	}

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	int status = decimate<PFP>(map, selector, approximators, nbWantedVertices, true, edgeErrors, callback_wrapper, callback_object) ;
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	delete selector ;

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	for(typename std::vector<ApproximatorGen<PFP>*>::iterator it = approximators.begin(); it != approximators.end(); ++it)
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		delete (*it) ;
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	delete[] v_approx ;
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	return status ;
}
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template <typename PFP>
int decimate(
		typename PFP::MAP& map,
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		Selector<PFP>* selector, std::vector<ApproximatorGen<PFP>*>& approximators,
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		unsigned int nbWantedVertices,
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		bool recomputePriorityList,
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		EdgeAttribute<typename PFP::REAL, typename PFP::MAP::IMPL>* edgeErrors,
		void (*callback_wrapper)(void*, const void*), void* callback_object
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)
{
	for(typename std::vector<ApproximatorGen<PFP>*>::iterator it = approximators.begin(); it != approximators.end(); ++it)
		(*it)->init() ;
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	Dart d ;
	if (recomputePriorityList || !selector->nextEdge(d))
	{
		if(!selector->init())
			return -1 ; // init failed
	}
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	unsigned int nbVertices = Algo::Topo::getNbOrbits<VERTEX>(map) ;
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	bool finished = false ;
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	while(!finished)
	{
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		if(!selector->nextEdge(d))
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			break ; // finished before achieving amount of required vertices
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		--nbVertices ;

		Dart d2 = map.phi2(map.phi_1(d)) ;
		Dart dd2 = map.phi2(map.phi_1(map.phi2(d))) ;

		for(typename std::vector<ApproximatorGen<PFP>*>::iterator it = approximators.begin(); it != approximators.end(); ++it)
		{
			(*it)->approximate(d) ;				// compute approximated attributes
			(*it)->saveApprox(d) ;
		}

		selector->updateBeforeCollapse(d) ;		// update selector

		map.collapseEdge(d) ;					// collapse edge

		for(typename std::vector<ApproximatorGen<PFP>*>::iterator it = approximators.begin(); it != approximators.end(); ++it)
			(*it)->affectApprox(d2);			// affect data to the resulting vertex

		selector->updateAfterCollapse(d2, dd2) ;// update selector

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		if(nbVertices <= nbWantedVertices)
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			finished = true ;
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		// Progress bar support
		if (callback_wrapper != NULL && callback_object != NULL)
			callback_wrapper(callback_object, &nbVertices) ;
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	}

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	if (edgeErrors != NULL)
		selector->getEdgeErrors(edgeErrors) ;

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	return finished == true ? 0 : 1 ; // finished correctly
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}

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} // namespace Decimation
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} // namespace Surface
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} // namespace Algo
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} // namespace CGoGN