// Copyright (c) 2022 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _RWPly_PlyWriterContext_HeaderFiler
#define _RWPly_PlyWriterContext_HeaderFiler

#include <Graphic3d_Vec.hxx>
#include <gp_Pnt.hxx>
#include <TCollection_AsciiString.hxx>
#include <TColStd_IndexedDataMapOfStringString.hxx>

#include <memory>

//! Auxiliary low-level tool writing PLY file.
class RWPly_PlyWriterContext
{
public:

  //! Empty constructor.
  Standard_EXPORT RWPly_PlyWriterContext();

  //! Destructor, will emit error message if file was not closed.
  Standard_EXPORT ~RWPly_PlyWriterContext();

public: //! @name vertex attributes parameters

  //! Return TRUE if vertex position should be stored with double floating point precision; FALSE by default.
  bool IsDoublePrecision() const { return myIsDoublePrec; }

  //! Set if vertex position should be stored with double floating point precision.
  void SetDoublePrecision (bool theDoublePrec) { myIsDoublePrec = theDoublePrec; }

  //! Return TRUE if normals should be written as vertex attribute; FALSE by default.
  bool HasNormals() const { return myHasNormals; }

  //! Set if normals should be written.
  void SetNormals (const bool theHasNormals) { myHasNormals = theHasNormals; }

  //! Return TRUE if UV / texture coordinates should be written as vertex attribute; FALSE by default.
  bool HasTexCoords() const { return myHasTexCoords; }

  //! Set if UV / texture coordinates should be written.
  void SetTexCoords (const bool theHasTexCoords) { myHasTexCoords = theHasTexCoords; }

  //! Return TRUE if point colors should be written as vertex attribute; FALSE by default.
  bool HasColors() const { return myHasColors; }

  //! Set if point colors should be written.
  void SetColors (bool theToWrite) { myHasColors = theToWrite; }

public: //! @name element attributes parameters

  //! Return TRUE if surface Id should be written as element attribute; FALSE by default.
  bool HasSurfaceId() const { return myHasSurfId; }

  //! Set if surface Id should be written as element attribute; FALSE by default.
  void SetSurfaceId (bool theSurfId) { myHasSurfId = theSurfId; }

public: //! @name writing into file

  //! Return TRUE if file has been opened.
  bool IsOpened() const { return myStream.get() != nullptr; }

  //! Open file for writing.
  Standard_EXPORT bool Open (const TCollection_AsciiString& theName,
                             const std::shared_ptr<std::ostream>& theStream = std::shared_ptr<std::ostream>());

  //! Write the header.
  //! @param[in] theNbNodes number of vertex nodes
  //! @param[in] theNbElems number of mesh elements
  //! @param[in] theFileInfo optional comments
  Standard_EXPORT bool WriteHeader (const Standard_Integer theNbNodes,
                                    const Standard_Integer theNbElems,
                                    const TColStd_IndexedDataMapOfStringString& theFileInfo);

  //! Write single point with all attributes.
  //! @param[in] thePoint 3D point coordinates
  //! @param[in] theNorm  surface normal direction at the point
  //! @param[in] theUV    surface/texture UV coordinates
  //! @param[in] theColor RGB color values
  Standard_EXPORT bool WriteVertex (const gp_Pnt& thePoint,
                                    const Graphic3d_Vec3& theNorm,
                                    const Graphic3d_Vec2& theUV,
                                    const Graphic3d_Vec4ub& theColor);

  //! Return number of written vertices.
  Standard_Integer NbWrittenVertices() const { return myNbVerts; }

  //! Return vertex offset to be applied to element indices; 0 by default.
  Standard_Integer VertexOffset() const { return myVertOffset; }

  //! Set vertex offset to be applied to element indices.
  void SetVertexOffset (Standard_Integer theOffset) { myVertOffset = theOffset; }

  //! Return surface id to write with element; 0 by default.
  Standard_Integer SurfaceId() const { return mySurfId; }

  //! Set surface id to write with element.
  void SetSurfaceId (Standard_Integer theSurfId) { mySurfId = theSurfId; }

  //! Writing a triangle.
  Standard_EXPORT bool WriteTriangle (const Graphic3d_Vec3i& theTri);

  //! Writing a quad.
  Standard_EXPORT bool WriteQuad (const Graphic3d_Vec4i& theQuad);

  //! Return number of written elements.
  Standard_Integer NbWrittenElements() const { return myNbElems; }

  //! Correctly close the file.
  //! @return FALSE in case of writing error
  Standard_EXPORT bool Close (bool theIsAborted = false);

private:

  std::shared_ptr<std::ostream> myStream;
  TCollection_AsciiString myName;
  Standard_Integer myNbHeaderVerts;
  Standard_Integer myNbHeaderElems;
  Standard_Integer myNbVerts;
  Standard_Integer myNbElems;
  Standard_Integer mySurfId;
  Standard_Integer myVertOffset;
  bool myIsDoublePrec;
  bool myHasNormals;
  bool myHasColors;
  bool myHasTexCoords;
  bool myHasSurfId;

};

#endif // _RWPly_PlyWriterContext_HeaderFiler