/*
Open Asset Import Library (assimp)
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

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


#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;
    for(const IfcCartesianPoint& cp : def.Points) {
        ConvertCartesianPoint(t,cp);
        meshout.verts.push_back(t);
    }
    meshout.vertcnt.push_back(static_cast<unsigned int>(meshout.verts.size()));
}

// ------------------------------------------------------------------------------------------------
bool ProcessCurve(const IfcCurve& curve,  TempMesh& meshout, ConversionData& conv)
{
    std::unique_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(static_cast<unsigned int>(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(def.ToPtr<IfcCircleHollowProfileDef>()) {
            // TODO
        }
        const size_t segments = conv.settings.cylindricalTessellation;
        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(static_cast<unsigned int>(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