// Created on: 1999-06-16
// Created by: Sergey RUIN
// Copyright (c) 1999 Matra Datavision
// Copyright (c) 1999-2014 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 _TDataStd_RealArray_HeaderFile
#define _TDataStd_RealArray_HeaderFile

#include <Standard.hxx>

#include <NCollection_Array1.hxx>
#include <NCollection_HArray1.hxx>
#include <TDF_Attribute.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Real.hxx>
#include <Standard_OStream.hxx>
#include <Standard_GUID.hxx>

class TDF_Label;
class TDF_RelocationTable;
class TDF_DeltaOnModification;

//! A framework for an attribute composed of a real number array.
class TDataStd_RealArray : public TDF_Attribute
{
  friend class TDataStd_DeltaOnModificationOfRealArray;
  DEFINE_STANDARD_RTTIEXT(TDataStd_RealArray, TDF_Attribute)
public:
  //! class methods
  //! =============
  //! Returns the GUID for arrays of reals.
  Standard_EXPORT static const Standard_GUID& GetID();

  //! Finds or creates on the <label> a real array attribute with
  //! the specified <lower> and <upper> boundaries.
  //! If <isDelta> == False, DefaultDeltaOnModification is used.
  //! If <isDelta> == True, DeltaOnModification of the current attribute is used.
  //! If attribute is already set, input parameter <isDelta> is refused and the found
  //! attribute returned.
  Standard_EXPORT static occ::handle<TDataStd_RealArray> Set(const TDF_Label& label,
                                                             const int        lower,
                                                             const int        upper,
                                                             const bool       isDelta = false);

  //! Finds, or creates, an RealArray attribute with explicit user defined <guid>.
  //! The RealArray attribute is returned.
  Standard_EXPORT static occ::handle<TDataStd_RealArray> Set(const TDF_Label&     label,
                                                             const Standard_GUID& theGuid,
                                                             const int            lower,
                                                             const int            upper,
                                                             const bool           isDelta = false);

  //! Initialize the inner array with bounds from <lower> to <upper>
  Standard_EXPORT void Init(const int lower, const int upper);

  //! Sets the explicit GUID (user defined) for the attribute.
  Standard_EXPORT void SetID(const Standard_GUID& theGuid) override;

  //! Sets default GUID for the attribute.
  Standard_EXPORT void SetID() override;

  //! Sets the <Index>th element of the array to <Value>
  //! OutOfRange exception is raised if <Index> doesn't respect Lower and Upper bounds of the
  //! internal array.
  Standard_EXPORT void SetValue(const int Index, const double Value);

  //! Return the value of the <Index>th element of the array
  Standard_EXPORT double Value(const int Index) const;

  double operator()(const int Index) const { return Value(Index); }

  //! Returns the lower boundary of the array.
  Standard_EXPORT int Lower() const;

  //! Returns the upper boundary of the array.
  Standard_EXPORT int Upper() const;

  //! Returns the number of elements of the array of reals
  //! in terms of the number of elements it contains.
  Standard_EXPORT int Length() const;

  //! Sets the inner array <myValue> of the RealArray attribute
  //! to <newArray>. If value of <newArray> differs from <myValue>,
  //! Backup performed and myValue refers to new instance of HArray1OfReal
  //! that holds <newArray> values
  //! If <isCheckItems> equal True each item of <newArray> will be checked with each
  //! item of <myValue> for coincidence (to avoid backup).
  Standard_EXPORT void ChangeArray(const occ::handle<NCollection_HArray1<double>>& newArray,
                                   const bool isCheckItems = true);

  //! Returns the handle of this array of reals.
  const occ::handle<NCollection_HArray1<double>>& Array() const { return myValue; }

  bool GetDelta() const { return myIsDelta; }

  //! for internal use only!
  void SetDelta(const bool isDelta) { myIsDelta = isDelta; }

  Standard_EXPORT TDataStd_RealArray();

  Standard_EXPORT const Standard_GUID& ID() const override;

  Standard_EXPORT void Restore(const occ::handle<TDF_Attribute>& With) override;

  Standard_EXPORT occ::handle<TDF_Attribute> NewEmpty() const override;

  //! Note. Uses inside ChangeArray() method
  Standard_EXPORT void Paste(const occ::handle<TDF_Attribute>&       Into,
                             const occ::handle<TDF_RelocationTable>& RT) const override;

  Standard_EXPORT Standard_OStream& Dump(Standard_OStream& anOS) const override;

  //! Makes a DeltaOnModification between <me> and
  //! <anOldAttribute>.
  Standard_EXPORT occ::handle<TDF_DeltaOnModification> DeltaOnModification(
    const occ::handle<TDF_Attribute>& anOldAttribute) const override;

  //! Dumps the content of me into the stream
  Standard_EXPORT void DumpJson(Standard_OStream& theOStream, int theDepth = -1) const override;

private:
  void RemoveArray() { myValue.Nullify(); }

private:
  occ::handle<NCollection_HArray1<double>> myValue;
  bool                                     myIsDelta;
  Standard_GUID                            myID;
};

#endif // _TDataStd_RealArray_HeaderFile
