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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_2x3.h"
#include "IFCLoader.h"
#include "AssetLib/Step/STEPFile.h"

#include <assimp/mesh.h>
#include <assimp/material.h>

#include <utility>

struct aiNode;

namespace Assimp {
namespace IFC {

    typedef double IfcFloat;

    // IfcFloat-precision math data types
    typedef aiVector2t<IfcFloat> IfcVector2;
    typedef aiVector3t<IfcFloat> IfcVector3;
    typedef aiMatrix4x4t<IfcFloat> IfcMatrix4;
    typedef aiMatrix3x3t<IfcFloat> IfcMatrix3;
    typedef aiColor4t<IfcFloat> IfcColor4;


// ------------------------------------------------------------------------------------------------
// 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;
    }
};



// ------------------------------------------------------------------------------------------------
// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.
// ------------------------------------------------------------------------------------------------
struct TempMesh {
    std::vector<IfcVector3> mVerts;
    std::vector<unsigned int> mVertcnt;

    // utilities
    aiMesh* ToMesh();
    void Clear();
    void Transform(const IfcMatrix4& mat);
    IfcVector3 Center() const;
    void Append(const TempMesh& other);
    bool IsEmpty() const;
    void RemoveAdjacentDuplicates();
    void RemoveDegenerates();
    void FixupFaceOrientation();
    static IfcVector3 ComputePolygonNormal(const IfcVector3* vtcs, size_t cnt, bool normalize = true);
    IfcVector3 ComputeLastPolygonNormal(bool normalize = true) const;
    void ComputePolygonNormals(std::vector<IfcVector3>& normals, bool normalize = true, size_t ofs = 0) const;
    void Swap(TempMesh& other);
};

inline
bool TempMesh::IsEmpty() const {
    return mVerts.empty() && mVertcnt.empty();
}


// ------------------------------------------------------------------------------------------------
// Temporary representation of an opening in a wall or a floor
// ------------------------------------------------------------------------------------------------
struct TempOpening
{
    const IFC::Schema_2x3::IfcSolidModel *solid;
    IfcVector3 extrusionDir;

    std::shared_ptr<TempMesh> profileMesh;
    std::shared_ptr<TempMesh> profileMesh2D;

    // list of points generated for this opening. This is used to
    // create connections between two opposing holes created
    // from a single opening instance (two because walls tend to
    // have two sides). If !empty(), the other side of the wall
    // has already been processed.
    std::vector<IfcVector3> wallPoints;

    // ------------------------------------------------------------------------------
    TempOpening()
        : solid()
        , extrusionDir()
        , profileMesh()
    {
    }

    // ------------------------------------------------------------------------------
    TempOpening(const IFC::Schema_2x3::IfcSolidModel *solid, IfcVector3 extrusionDir,
            std::shared_ptr<TempMesh> profileMesh,
            std::shared_ptr<TempMesh> profileMesh2D) :
            solid(solid), extrusionDir(extrusionDir), profileMesh(std::move(profileMesh)), profileMesh2D(std::move(profileMesh2D)) {
    }

    // ------------------------------------------------------------------------------
    void Transform(const IfcMatrix4& mat); // defined later since TempMesh is not complete yet



    // ------------------------------------------------------------------------------
    // Helper to sort openings by distance from a given base point
    struct DistanceSorter {

        DistanceSorter(const IfcVector3& base) : base(base) {}

        bool operator () (const TempOpening& a, const TempOpening& b) const {
            return (a.profileMesh->Center()-base).SquareLength() < (b.profileMesh->Center()-base).SquareLength();
        }

        IfcVector3 base;
    };
};


// ------------------------------------------------------------------------------------------------
// Intermediate data storage during conversion. Keeps everything and a bit more.
// ------------------------------------------------------------------------------------------------
struct ConversionData
{
    ConversionData(const STEP::DB& db, const IFC::Schema_2x3::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>());
    }

    IfcFloat len_scale, angle_scale;
    bool plane_angle_in_radians;

    const STEP::DB& db;
    const IFC::Schema_2x3::IfcProject& proj;
    aiScene* out;

    IfcMatrix4 wcs;
    std::vector<aiMesh*> meshes;
    std::vector<aiMaterial*> materials;

    struct MeshCacheIndex {
        const IFC::Schema_2x3::IfcRepresentationItem* item; unsigned int matindex;
        MeshCacheIndex() : item(nullptr), matindex(0) { }
        MeshCacheIndex(const IFC::Schema_2x3::IfcRepresentationItem* i, unsigned int mi) : item(i), matindex(mi) { }
        bool operator == (const MeshCacheIndex& o) const { return item == o.item && matindex == o.matindex; }
        bool operator < (const MeshCacheIndex& o) const { return item < o.item || (item == o.item && matindex < o.matindex); }
    };
    typedef std::map<MeshCacheIndex, std::set<unsigned int> > MeshCache;
    MeshCache cached_meshes;

    typedef std::map<const IFC::Schema_2x3::IfcSurfaceStyle*, unsigned int> MaterialCache;
    MaterialCache cached_materials;

    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;

    std::set<uint64_t> already_processed;
};


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

    FuzzyVectorCompare(IfcFloat epsilon) : epsilon(epsilon) {}
    bool operator()(const IfcVector3& a, const IfcVector3& b) {
        return std::abs((a-b).SquareLength()) < epsilon;
    }

    const IfcFloat epsilon;
};


// ------------------------------------------------------------------------------------------------
// Ordering predicate to totally order R^2 vectors first by x and then by y
// ------------------------------------------------------------------------------------------------
struct XYSorter {

    // sort first by X coordinates, then by Y coordinates
    bool operator () (const IfcVector2&a, const IfcVector2& b) const {
        if (a.x == b.x) {
            return a.y < b.y;
        }
        return a.x < b.x;
    }
};



// conversion routines for common IFC entities, implemented in IFCUtil.cpp
void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourRgb& in);
void ConvertColor(aiColor4D& out, const Schema_2x3::IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base);
void ConvertCartesianPoint(IfcVector3& out, const Schema_2x3::IfcCartesianPoint& in);
void ConvertDirection(IfcVector3& out, const Schema_2x3::IfcDirection& in);
void ConvertVector(IfcVector3& out, const Schema_2x3::IfcVector& in);
void AssignMatrixAxes(IfcMatrix4& out, const IfcVector3& x, const IfcVector3& y, const IfcVector3& z);
void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement3D& in);
void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement2D& in);
void ConvertAxisPlacement(IfcVector3& axis, IfcVector3& pos, const IFC::Schema_2x3::IfcAxis1Placement& in);
void ConvertAxisPlacement(IfcMatrix4& out, const Schema_2x3::IfcAxis2Placement& in, ConversionData& conv);
void ConvertTransformOperator(IfcMatrix4& out, const Schema_2x3::IfcCartesianTransformationOperator& op);
bool IsTrue(const Assimp::STEP::EXPRESS::BOOLEAN& in);
IfcFloat ConvertSIPrefix(const std::string& prefix);


// IFCProfile.cpp
bool ProcessProfile(const Schema_2x3::IfcProfileDef& prof, TempMesh& meshout, ConversionData& conv);
bool ProcessCurve(const Schema_2x3::IfcCurve& curve,  TempMesh& meshout, ConversionData& conv);

// IFCMaterial.cpp
unsigned int ProcessMaterials(uint64_t id, unsigned int prevMatId, ConversionData& conv, bool forceDefaultMat);

// IFCGeometry.cpp
IfcMatrix3 DerivePlaneCoordinateSpace(const TempMesh& curmesh, bool& ok, IfcVector3& norOut);
bool ProcessRepresentationItem(const Schema_2x3::IfcRepresentationItem& item, unsigned int matid, std::set<unsigned int>& mesh_indices, ConversionData& conv);
void AssignAddedMeshes(std::set<unsigned int>& mesh_indices,aiNode* nd,ConversionData& /*conv*/);

void ProcessSweptAreaSolid(const Schema_2x3::IfcSweptAreaSolid& swept, TempMesh& meshout,
                           ConversionData& conv);

void ProcessExtrudedAreaSolid(const Schema_2x3::IfcExtrudedAreaSolid& solid, TempMesh& result,
                              ConversionData& conv, bool collect_openings);

// IFCBoolean.cpp

void ProcessBoolean(const Schema_2x3::IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv);
void ProcessBooleanHalfSpaceDifference(const Schema_2x3::IfcHalfSpaceSolid* hs, TempMesh& result,
                                       const TempMesh& first_operand,
                                       ConversionData& conv);

void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const Schema_2x3::IfcPolygonalBoundedHalfSpace* hs, TempMesh& result,
                                                       const TempMesh& first_operand,
                                                       ConversionData& conv);
void ProcessBooleanExtrudedAreaSolidDifference(const Schema_2x3::IfcExtrudedAreaSolid* as, TempMesh& result,
                                               const TempMesh& first_operand,
                                               ConversionData& conv);


// IFCOpenings.cpp

bool GenerateOpenings(std::vector<TempOpening>& openings,
                      TempMesh& curmesh,
                      bool check_intersection,
                      bool generate_connection_geometry,
                      const IfcVector3& wall_extrusion_axis = IfcVector3(0,1,0));



// IFCCurve.cpp

// ------------------------------------------------------------------------------------------------
// Custom exception for use by members of the Curve class
// ------------------------------------------------------------------------------------------------
class CurveError {
public:
    CurveError(const std::string& s)
    : mStr(s) {
        // empty
    }

    std::string mStr;
};

// ------------------------------------------------------------------------------------------------
// 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 Schema_2x3::IfcCurve& base_entity, ConversionData& conv)
    : base_entity(base_entity)
    , conv(conv) {
        // empty
    }

public:
    typedef std::pair<IfcFloat, IfcFloat> ParamRange;

    virtual ~Curve() = default;

    // check if a curve is closed
    virtual bool IsClosed() const = 0;

    // evaluate the curve at the given parametric position
    virtual IfcVector3 Eval(IfcFloat p) const = 0;

    // try to match a point on the curve to a given parameter
    // for self-intersecting curves, the result is not ambiguous and
    // it is undefined which parameter is returned.
    virtual bool ReverseEval(const IfcVector3& val, IfcFloat& paramOut) const;

    // 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<IfcFloat,IfcFloat> GetParametricRange() const = 0;
    IfcFloat GetParametricRangeDelta() const;

    // estimate the number of sample points that this curve will require
    virtual size_t EstimateSampleCount(IfcFloat start,IfcFloat end) const;

    // intelligently sample the curve based on the current settings
    // and append the result to the mesh
    virtual void SampleDiscrete(TempMesh& out,IfcFloat start,IfcFloat end) const;

#ifdef ASSIMP_BUILD_DEBUG
    // check if a particular parameter value lies within the well-defined range
    bool InRange(IfcFloat) const;
#endif
    static Curve* Convert(const IFC::Schema_2x3::IfcCurve&,ConversionData& conv);

protected:
    const Schema_2x3::IfcCurve& base_entity;
    ConversionData& conv;
};


// --------------------------------------------------------------------------------
// A BoundedCurve always holds the invariant that GetParametricRange()
// never returns infinite values.
// --------------------------------------------------------------------------------
class BoundedCurve : public Curve {
public:
    BoundedCurve(const Schema_2x3::IfcBoundedCurve& entity, ConversionData& conv)
        : Curve(entity,conv)
    {}

public:

    bool IsClosed() const;

public:

    // sample the entire curve
    void SampleDiscrete(TempMesh& out) const;
    using Curve::SampleDiscrete;
};

// IfcProfile.cpp
bool ProcessCurve(const Schema_2x3::IfcCurve& curve,  TempMesh& meshout, ConversionData& conv);
}
}

#endif
