/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  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
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* Neither the name of the assimp team, nor the names of its
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  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file  IFCProfile.cpp
 *  @brief Read profile and curves entities from IFC files
 */

#include "AssimpPCH.h"

#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
#include "IFCUtil.h"

namespace Assimp {
	namespace IFC {

// ------------------------------------------------------------------------------------------------
void ProcessPolyLine(const IfcPolyline& def, TempMesh& meshout, ConversionData& /*conv*/)
{
	// this won't produce a valid mesh, it just spits out a list of vertices
	IfcVector3 t;
	BOOST_FOREACH(const IfcCartesianPoint& cp, def.Points) {
		ConvertCartesianPoint(t,cp);
		meshout.verts.push_back(t);
	}
	meshout.vertcnt.push_back(meshout.verts.size());
}

// ------------------------------------------------------------------------------------------------
bool ProcessCurve(const IfcCurve& curve,  TempMesh& meshout, ConversionData& conv)
{
	boost::scoped_ptr<const Curve> cv(Curve::Convert(curve,conv));
	if (!cv) {
		IFCImporter::LogWarn("skipping unknown IfcCurve entity, type is " + curve.GetClassName());
		return false;
	}

	// we must have a bounded curve at this point
	if (const BoundedCurve* bc = dynamic_cast<const BoundedCurve*>(cv.get())) {
		try {
			bc->SampleDiscrete(meshout);
		}
		catch(const  CurveError& cv) {
			IFCImporter::LogError(cv.s+ " (error occurred while processing curve)");
			return false;
		}
		meshout.vertcnt.push_back(meshout.verts.size());
		return true;
	}

	IFCImporter::LogError("cannot use unbounded curve as profile");
	return false;
}

// ------------------------------------------------------------------------------------------------
void ProcessClosedProfile(const IfcArbitraryClosedProfileDef& def, TempMesh& meshout, ConversionData& conv)
{
	ProcessCurve(def.OuterCurve,meshout,conv);
}

// ------------------------------------------------------------------------------------------------
void ProcessOpenProfile(const IfcArbitraryOpenProfileDef& def, TempMesh& meshout, ConversionData& conv)
{
	ProcessCurve(def.Curve,meshout,conv);
}

// ------------------------------------------------------------------------------------------------
void ProcessParametrizedProfile(const IfcParameterizedProfileDef& def, TempMesh& meshout, ConversionData& conv)
{
	if(const IfcRectangleProfileDef* const cprofile = def.ToPtr<IfcRectangleProfileDef>()) {
		const IfcFloat x = cprofile->XDim*0.5f, y = cprofile->YDim*0.5f;

		meshout.verts.reserve(meshout.verts.size()+4);
		meshout.verts.push_back( IfcVector3( x, y, 0.f ));
		meshout.verts.push_back( IfcVector3(-x, y, 0.f ));
		meshout.verts.push_back( IfcVector3(-x,-y, 0.f ));
		meshout.verts.push_back( IfcVector3( x,-y, 0.f ));
		meshout.vertcnt.push_back(4);
	}
	else if( const IfcCircleProfileDef* const circle = def.ToPtr<IfcCircleProfileDef>()) {
		if( const IfcCircleHollowProfileDef* const hollow = def.ToPtr<IfcCircleHollowProfileDef>()) {
			// TODO
		}
		const size_t segments = 32;
		const IfcFloat delta = AI_MATH_TWO_PI_F/segments, radius = circle->Radius;

		meshout.verts.reserve(segments);

		IfcFloat angle = 0.f;
		for(size_t i = 0; i < segments; ++i, angle += delta) {
            meshout.verts.push_back( IfcVector3( std::cos(angle)*radius, std::sin(angle)*radius, 0.f ));
		}

		meshout.vertcnt.push_back(segments);
	}
	else if( const IfcIShapeProfileDef* const ishape = def.ToPtr<IfcIShapeProfileDef>()) {
		// construct simplified IBeam shape
		const IfcFloat offset = (ishape->OverallWidth - ishape->WebThickness) / 2;
		const IfcFloat inner_height = ishape->OverallDepth - ishape->FlangeThickness * 2;

		meshout.verts.reserve(12);
		meshout.verts.push_back(IfcVector3(0,0,0));
		meshout.verts.push_back(IfcVector3(0,ishape->FlangeThickness,0));
		meshout.verts.push_back(IfcVector3(offset,ishape->FlangeThickness,0));
		meshout.verts.push_back(IfcVector3(offset,ishape->FlangeThickness + inner_height,0));
		meshout.verts.push_back(IfcVector3(0,ishape->FlangeThickness + inner_height,0));
		meshout.verts.push_back(IfcVector3(0,ishape->OverallDepth,0));
		meshout.verts.push_back(IfcVector3(ishape->OverallWidth,ishape->OverallDepth,0));
		meshout.verts.push_back(IfcVector3(ishape->OverallWidth,ishape->FlangeThickness + inner_height,0));
		meshout.verts.push_back(IfcVector3(offset+ishape->WebThickness,ishape->FlangeThickness + inner_height,0));
		meshout.verts.push_back(IfcVector3(offset+ishape->WebThickness,ishape->FlangeThickness,0));
		meshout.verts.push_back(IfcVector3(ishape->OverallWidth,ishape->FlangeThickness,0));
		meshout.verts.push_back(IfcVector3(ishape->OverallWidth,0,0));

		meshout.vertcnt.push_back(12);
	}
	else {
		IFCImporter::LogWarn("skipping unknown IfcParameterizedProfileDef entity, type is " + def.GetClassName());
		return;
	}

	IfcMatrix4 trafo;
	ConvertAxisPlacement(trafo, *def.Position);
	meshout.Transform(trafo);
}

// ------------------------------------------------------------------------------------------------
bool ProcessProfile(const IfcProfileDef& prof, TempMesh& meshout, ConversionData& conv) 
{
	if(const IfcArbitraryClosedProfileDef* const cprofile = prof.ToPtr<IfcArbitraryClosedProfileDef>()) {
		ProcessClosedProfile(*cprofile,meshout,conv);
	}
	else if(const IfcArbitraryOpenProfileDef* const copen = prof.ToPtr<IfcArbitraryOpenProfileDef>()) {
		ProcessOpenProfile(*copen,meshout,conv);
	}
	else if(const IfcParameterizedProfileDef* const cparam = prof.ToPtr<IfcParameterizedProfileDef>()) {
		ProcessParametrizedProfile(*cparam,meshout,conv);
	}
	else {
		IFCImporter::LogWarn("skipping unknown IfcProfileDef entity, type is " + prof.GetClassName());
		return false;
	}
	meshout.RemoveAdjacentDuplicates();
	if (!meshout.vertcnt.size() || meshout.vertcnt.front() <= 1) {
		return false;
	}
	return true;
}

} // ! IFC
} // ! Assimp

#endif
