/*
Open Asset Import Library (ASSIMP)
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All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/

/** @file  IFC.cpp
 *  @brief Implementation of the Industry Foundation Classes loader.
 */

#ifndef INCLUDED_IFCUTIL_H
#define INCLUDED_IFCUTIL_H

#include "IFCReaderGen.h"
#include "IFCLoader.h"

namespace Assimp {
namespace IFC {

// helper for std::for_each to delete all heap-allocated items in a container
template<typename T>
struct delete_fun
{
	void operator()(T* del) {
		delete del;
	}
};

// ------------------------------------------------------------------------------------------------
// Temporary representation of an opening in a wall or a floor
// ------------------------------------------------------------------------------------------------
struct TempMesh;
struct TempOpening 
{
	const IFC::IfcExtrudedAreaSolid* solid;
	aiVector3D extrusionDir;
	boost::shared_ptr<TempMesh> profileMesh;

	// ------------------------------------------------------------------------------
	TempOpening(const IFC::IfcExtrudedAreaSolid* solid,aiVector3D extrusionDir,boost::shared_ptr<TempMesh> profileMesh)
		: solid(solid)
		, extrusionDir(extrusionDir)
		, profileMesh(profileMesh)
	{
	}

	// ------------------------------------------------------------------------------
	void Transform(const aiMatrix4x4& mat); // defined later since TempMesh is not complete yet
};


// ------------------------------------------------------------------------------------------------
// Intermediate data storage during conversion. Keeps everything and a bit more.
// ------------------------------------------------------------------------------------------------
struct ConversionData 
{
	ConversionData(const STEP::DB& db, const IFC::IfcProject& proj, aiScene* out,const IFCImporter::Settings& settings)
		: len_scale(1.0)
		, angle_scale(1.0)
		, db(db)
		, proj(proj)
		, out(out)
		, settings(settings)
		, apply_openings()
		, collect_openings()
	{}

	~ConversionData() {
		std::for_each(meshes.begin(),meshes.end(),delete_fun<aiMesh>());
		std::for_each(materials.begin(),materials.end(),delete_fun<aiMaterial>());
	}

	float len_scale, angle_scale;
	bool plane_angle_in_radians;

	const STEP::DB& db;
	const IFC::IfcProject& proj;
	aiScene* out;

	aiMatrix4x4 wcs;
	std::vector<aiMesh*> meshes;
	std::vector<aiMaterial*> materials;

	typedef std::map<const IFC::IfcRepresentationItem*, std::vector<unsigned int> > MeshCache;
	MeshCache cached_meshes;

	const IFCImporter::Settings& settings;

	// Intermediate arrays used to resolve openings in walls: only one of them
	// can be given at a time. apply_openings if present if the current element
	// is a wall and needs its openings to be poured into its geometry while
	// collect_openings is present only if the current element is an 
	// IfcOpeningElement, for which all the geometry needs to be preserved
	// for later processing by a parent, which is a wall. 
	std::vector<TempOpening>* apply_openings;
	std::vector<TempOpening>* collect_openings;
};

// ------------------------------------------------------------------------------------------------
// Binary predicate to compare vectors with a given, quadratic epsilon.
// ------------------------------------------------------------------------------------------------
struct FuzzyVectorCompare {

	FuzzyVectorCompare(float epsilon) : epsilon(epsilon) {}
	bool operator()(const aiVector3D& a, const aiVector3D& b) {
		return fabs((a-b).SquareLength()) < epsilon;
	}

	const float epsilon;
};


// ------------------------------------------------------------------------------------------------
// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.
// ------------------------------------------------------------------------------------------------
struct TempMesh
{
	std::vector<aiVector3D> verts;
	std::vector<unsigned int> vertcnt;

	// utilities
	aiMesh* ToMesh();
	void Clear();
	void Transform(const aiMatrix4x4& mat);
	aiVector3D Center() const;
	void Append(const TempMesh& other);
	void RemoveAdjacentDuplicates();
};





// conversion routines for common IFC entities, implemented in IFCUtil.cpp
void ConvertColor(aiColor4D& out, const IfcColourRgb& in);
void ConvertColor(aiColor4D& out, const IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base);
void ConvertCartesianPoint(aiVector3D& out, const IfcCartesianPoint& in);
void ConvertDirection(aiVector3D& out, const IfcDirection& in);
void ConvertVector(aiVector3D& out, const IfcVector& in);
void AssignMatrixAxes(aiMatrix4x4& out, const aiVector3D& x, const aiVector3D& y, const aiVector3D& z);
void ConvertAxisPlacement(aiMatrix4x4& out, const IfcAxis2Placement3D& in);
void ConvertAxisPlacement(aiMatrix4x4& out, const IfcAxis2Placement2D& in);
void ConvertAxisPlacement(aiVector3D& axis, aiVector3D& pos, const IFC::IfcAxis1Placement& in);
void ConvertAxisPlacement(aiMatrix4x4& out, const IfcAxis2Placement& in, ConversionData& conv);
void ConvertTransformOperator(aiMatrix4x4& out, const IfcCartesianTransformationOperator& op);
bool IsTrue(const EXPRESS::BOOLEAN& in);
float ConvertSIPrefix(const std::string& prefix);


// IFCProfile.cpp
bool ProcessProfile(const IfcProfileDef& prof, TempMesh& meshout, ConversionData& conv);

// IFCMaterial.cpp
unsigned int ProcessMaterials(const IFC::IfcRepresentationItem& item, ConversionData& conv);

// IFCGeometry.cpp
bool ProcessRepresentationItem(const IfcRepresentationItem& item, std::vector<unsigned int>& mesh_indices, ConversionData& conv);
void AssignAddedMeshes(std::vector<unsigned int>& mesh_indices,aiNode* nd,ConversionData& /*conv*/);


// IFCCurve.cpp

// ------------------------------------------------------------------------------------------------
// Temporary representation for an arbitrary sub-class of IfcCurve. Used to sample the curves
// to obtain a list of line segments.
// ------------------------------------------------------------------------------------------------
class Curve
{
protected:

	Curve(const IfcCurve& base_entity, ConversionData& conv)
		: base_entity(base_entity)
		, conv(conv)
	{}

public:

	// evaluate the curve at the given parametric position
	virtual aiVector3D Eval(float p) const = 0;

	// get the range of the curve (both inclusive).
	// +inf and -inf are valid return values, the curve is not bounded in such a case.
	virtual std::pair<float,float> GetParametricRange() const = 0;

public:

	static Curve* Convert(const IFC::IfcCurve&,ConversionData& conv);

protected:

	const IfcCurve& base_entity;
	ConversionData& conv;
};


// --------------------------------------------------------------------------------
// A BoundedCurve always holds the invariant that GetParametricRange()
// never returns infinite values.
// --------------------------------------------------------------------------------
class BoundedCurve : public Curve 
{
public:

	BoundedCurve(const IfcBoundedCurve& entity, ConversionData& conv)
		: Curve(entity,conv)
	{}

public:

	// given a point on the curve, suggest a suitable next point for
	// discrete sampling. The returned parameter value should be
	// based on two considerations:
	//  a) curve geometry is to be preserved
	//  b) detail level should be chosen based on importer settings
	//     and (possibly) importance and dimension of the spatial 
	//     structure.
	// return +inf if the suggestion is to stop sampling.
	virtual float SuggestNext(float u) const;

	// intelligently sample the curve based on Eval() and SuggestNext()
	void SampleDiscrete(TempMesh& out) const;
};



}
}

#endif