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/// @file  IFCMaterial.cpp

/// @brief Implementation of conversion routines to convert IFC materials to aiMaterial

#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER

#include "IFCUtil.h"

#include <limits>

#include <assimp/material.h>

namespace Assimp {

namespace IFC {

// ------------------------------------------------------------------------------------------------

static int ConvertShadingMode(const std::string& name) {

    if (name == "BLINN") {

        return aiShadingMode_Blinn;

    }

    else if (name == "FLAT" || name == "NOTDEFINED") {

        return aiShadingMode_NoShading;

    }

    else if (name == "PHONG") {

        return aiShadingMode_Phong;

    }

    IFCImporter::LogWarn("shading mode ", name, " not recognized by Assimp, using Phong instead");

    return aiShadingMode_Phong;

}

// ------------------------------------------------------------------------------------------------

static void FillMaterial(aiMaterial* mat,const IFC::Schema_2x3::IfcSurfaceStyle* surf,ConversionData& conv) {

    aiString name;

    name.Set((surf->Name? surf->Name.Get() : "IfcSurfaceStyle_Unnamed"));

    mat->AddProperty(&name,AI_MATKEY_NAME);

    // now see which kinds of surface information are present

    for (const std::shared_ptr<const IFC::Schema_2x3::IfcSurfaceStyleElementSelect> &sel2 : surf->Styles) {

        if (const IFC::Schema_2x3::IfcSurfaceStyleShading* shade = sel2->ResolveSelectPtr<IFC::Schema_2x3::IfcSurfaceStyleShading>(conv.db)) {

            aiColor4D col_base,col;

            ConvertColor(col_base, shade->SurfaceColour);

            mat->AddProperty(&col_base,1, AI_MATKEY_COLOR_DIFFUSE);

            if (const IFC::Schema_2x3::IfcSurfaceStyleRendering* ren = shade->ToPtr<IFC::Schema_2x3::IfcSurfaceStyleRendering>()) {

                if (ren->Transparency) {

                    const float t = 1.f-static_cast<float>(ren->Transparency.Get());

                    mat->AddProperty(&t,1, AI_MATKEY_OPACITY);

                }

                if (ren->DiffuseColour) {

                    ConvertColor(col, *ren->DiffuseColour.Get(),conv,&col_base);

                    mat->AddProperty(&col,1, AI_MATKEY_COLOR_DIFFUSE);

                }

                if (ren->SpecularColour) {

                    ConvertColor(col, *ren->SpecularColour.Get(),conv,&col_base);

                    mat->AddProperty(&col,1, AI_MATKEY_COLOR_SPECULAR);

                }

                if (ren->TransmissionColour) {

                    ConvertColor(col, *ren->TransmissionColour.Get(),conv,&col_base);

                    mat->AddProperty(&col,1, AI_MATKEY_COLOR_TRANSPARENT);

                }

                if (ren->ReflectionColour) {

                    ConvertColor(col, *ren->ReflectionColour.Get(),conv,&col_base);

                    mat->AddProperty(&col,1, AI_MATKEY_COLOR_REFLECTIVE);

                }

                const int shading = (ren->SpecularHighlight && ren->SpecularColour)?ConvertShadingMode(ren->ReflectanceMethod):static_cast<int>(aiShadingMode_Gouraud);

                mat->AddProperty(&shading,1, AI_MATKEY_SHADING_MODEL);

                if (ren->SpecularHighlight) {

                    if(const ::Assimp::STEP::EXPRESS::REAL* rt = ren->SpecularHighlight.Get()->ToPtr<::Assimp::STEP::EXPRESS::REAL>()) {

                        // at this point we don't distinguish between the two distinct ways of

                        // specifying highlight intensities. leave this to the user.

                        const float e = static_cast<float>(*rt);

                        mat->AddProperty(&e,1,AI_MATKEY_SHININESS);

                    }

                    else {

                        IFCImporter::LogWarn("unexpected type error, SpecularHighlight should be a REAL");

                    }

                }

            }

        }

    }

}

// ------------------------------------------------------------------------------------------------

unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionData& conv, bool forceDefaultMat) {

    STEP::DB::RefMapRange range = conv.db.GetRefs().equal_range(id);

    for(;range.first != range.second; ++range.first) {

        if(const IFC::Schema_2x3::IfcStyledItem* const styled = conv.db.GetObject((*range.first).second)->ToPtr<IFC::Schema_2x3::IfcStyledItem>()) {

            for(const IFC::Schema_2x3::IfcPresentationStyleAssignment& as : styled->Styles) {

                for (const std::shared_ptr<const IFC::Schema_2x3::IfcPresentationStyleSelect> &sel : as.Styles) {

                    if( const IFC::Schema_2x3::IfcSurfaceStyle* const surf = sel->ResolveSelectPtr<IFC::Schema_2x3::IfcSurfaceStyle>(conv.db) ) {

                        // try to satisfy from cache

                        ConversionData::MaterialCache::iterator mit = conv.cached_materials.find(surf);

                        if( mit != conv.cached_materials.end() )

                            return mit->second;

                        // not found, create new material

                        const std::string side = static_cast<std::string>(surf->Side);

                        if( side != "BOTH" ) {

                            IFCImporter::LogWarn("ignoring surface side marker on IFC::IfcSurfaceStyle: ", side);

                        }

                        std::unique_ptr<aiMaterial> mat(new aiMaterial());

                        FillMaterial(mat.get(), surf, conv);

                        conv.materials.push_back(mat.release());

                        unsigned int matindex = static_cast<unsigned int>(conv.materials.size() - 1);

                        conv.cached_materials[surf] = matindex;

                        return matindex;

                    }

                }

            }

        }

    }

    // no local material defined. If there's global one, use that instead

    if ( prevMatId != std::numeric_limits<uint32_t>::max() ) {

        return prevMatId;

    }

    // we're still here - create an default material if required, or simply fail otherwise

    if ( !forceDefaultMat ) {

        return std::numeric_limits<uint32_t>::max();

    }

    aiString name;

    name.Set("<IFCDefault>");

    // look if there's already a default material with this base color

    for( size_t a = 0; a < conv.materials.size(); ++a ) {

        aiString mname;

        conv.materials[a]->Get(AI_MATKEY_NAME, mname);

        if ( name == mname ) {

            return ( unsigned int )a;

        }

    }

    // we're here, yet - no default material with suitable color available. Generate one

    std::unique_ptr<aiMaterial> mat(new aiMaterial());

    mat->AddProperty(&name,AI_MATKEY_NAME);

    const aiColor4D col = aiColor4D( 0.6f, 0.6f, 0.6f, 1.0f); // aiColor4D( color.r, color.g, color.b, 1.0f);

    mat->AddProperty(&col,1, AI_MATKEY_COLOR_DIFFUSE);

    conv.materials.push_back(mat.release());

    return (unsigned int) conv.materials.size() - 1;

}

} // ! IFC

} // ! Assimp

#endif // ASSIMP_BUILD_NO_IFC_IMPORTER