//
// ********************************************************************
// * This Software is part of the AIDA Unified Solids Library package *
// * See: https://aidasoft.web.cern.ch/USolids                        *
// ********************************************************************
//
// $Id:$
//
// --------------------------------------------------------------------
//
// UExtrudedSolid
//
// Class description:
//
// UExtrudedSolid is a solid which represents the extrusion of an arbitrary
// polygon with fixed outline in the defined Z sections.
// The z-sides of the solid are the scaled versions of the same polygon.
// The solid is implemented as a specification of UTessellatedSolid.
//
// Parameters in the constructor:
// const std::tring& pName             - solid name
// std::vector<UVector2> polygon       - the vertices of the outlined polygon
//                                       defined in clockwise or anti-clockwise
//                                       order
// std::vector<ZSection>               - the z-sections defined by
//                                       z position, offset and scale
//                                       in increasing z-position order
//
// Parameters in the special constructor (for solid with 2 z-sections:
// double halfZ                    - the solid half length in Z
// UVector2 off1                   - offset of the side in -halfZ
// double scale1                   - scale of the side in -halfZ
// UVector2 off2                   - offset of the side in +halfZ
// double scale2                   - scale of the side in -halfZ
//
// 13.08.13 Tatiana Nikitina
//          Created from original implementation in Geant4
// --------------------------------------------------------------------

#ifndef USOLIDS_UExtrudedSolid_HH
#define USOLIDS_UExtrudedSolid_HH

//#include <vector>

//#include "VUSolid.hh"
//#include "UUtils.hh"
#include "UTessellatedSolid.hh"
#include "UVector2.hh"

class VUFacet;

class UExtrudedSolid : public UTessellatedSolid
{

  public:

    struct ZSection
    {
      ZSection(double z, UVector2 offset, double scale)
        : fZ(z), fOffset(offset), fScale(scale) {}

      double    fZ;
      UVector2 fOffset;
      double    fScale;
    };

  public:

    UExtrudedSolid(const std::string&     pName,
                   std::vector<UVector2>  polygon,
                   std::vector<ZSection>  zsections);
    // General constructor

    UExtrudedSolid(const std::string&     pName,
                   std::vector<UVector2>  polygon,
                   double                 halfZ,
                   UVector2 off1, double scale1,
                   UVector2 off2, double scale2);
    // Special constructor for solid with 2 z-sections

    virtual ~UExtrudedSolid();
    // Destructor

    // Accessors

    inline int       GetNofVertices() const;
    inline UVector2 GetVertex(int index) const;
    inline std::vector<UVector2> GetPolygon() const;

    inline int       GetNofZSections() const;
    inline ZSection    GetZSection(int index) const;
    inline std::vector<ZSection> GetZSections() const;

    // Solid methods

    EnumInside Inside(const UVector3& aPoint) const;
    double DistanceToOut(const UVector3& aPoint,
                         const UVector3& aDirection,
                         UVector3&       aNormalVector,
                         bool&           aConvex,
                         double aPstep = UUtils::kInfinity) const;
    double  SafetyFromInside(const UVector3& aPoint,
                             bool aAccurate = false) const;
    UGeometryType GetEntityType() const
    {
      return "ExtrudedSolid";
    }
    VUSolid* Clone() const;

    std::ostream& StreamInfo(std::ostream& os) const;

  public:

    UExtrudedSolid();
    // Fake default constructor for usage restricted to direct object
    // persistency for clients requiring preallocation of memory for
    // persistifiable objects.

    UExtrudedSolid(const UExtrudedSolid& rhs);
    UExtrudedSolid& operator=(const UExtrudedSolid& rhs);
    // Copy constructor and assignment operator.

    void Initialise(std::vector<UVector2>& polygon,
                    std::vector<ZSection>& zsections);
    void Initialise(std::vector<UVector2>& polygon, double dz,
                    UVector2 off1, double scale1,
                    UVector2 off2, double scale2);
    // Initialisation methods for constructors.

  private:

    void ComputeProjectionParameters();

    UVector3 GetVertex(int iz, int ind) const;
    UVector2 ProjectPoint(const UVector3& point) const;

    bool IsSameLine(UVector2 p,
                    UVector2 l1, UVector2 l2) const;
    bool IsSameLineSegment(UVector2 p,
                           UVector2 l1, UVector2 l2) const;
    bool IsSameSide(UVector2 p1, UVector2 p2,
                    UVector2 l1, UVector2 l2) const;
    bool IsPointInside(UVector2 a, UVector2 b, UVector2 c,
                       UVector2 p) const;
    double GetAngle(UVector2 p0, UVector2 pa, UVector2 pb) const;

    VUFacet* MakeDownFacet(int ind1, int ind2, int ind3) const;
    VUFacet* MakeUpFacet(int ind1, int ind2, int ind3) const;

    bool AddGeneralPolygonFacets();
    bool MakeFacets();
    bool IsConvex() const;


  private:

    int       fNv;
    int       fNz;
    std::vector<UVector2> fPolygon;
    std::vector<ZSection> fZSections;
    std::vector< std::vector<int> > fTriangles;
    bool          fIsConvex;
    UGeometryType fGeometryType;

    std::vector<double>      fKScales;
    std::vector<double>      fScale0s;
    std::vector<UVector2>   fKOffsets;
    std::vector<UVector2>   fOffset0s;
};

#include "UExtrudedSolid.icc"

#endif