/*
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
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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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( cos(angle)*radius, 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
