/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkScaledSOADataArrayTemplate.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * @class   vtkScaledSOADataArrayTemplate
 * @brief   Struct-Of-Arrays implementation of
 * vtkGenericDataArray with a scaling factor.
 *
 *
 * vtkScaledSOADataArrayTemplate is the counterpart of vtkSOADataArrayTemplate with a
 * scaling factor. Each component is stored in a separate array. The Scale value is
 * used to multiply the output of the stored value in the array. For example, if Scale
 * is 2 and the requested tuple value stored in memory is [1, 2, 3] then the returned tuple
 * values will actually be [2, 4, 6]. Similarly, if Scale is 2 and the tuple values
 * for SetTupleValue() is [2, 4, 6] then the stored values in memory will be
 * [1, 2, 3].
 *
 * @sa
 * vtkGenericDataArray vtkSOADataArrayTemplate
*/

#ifndef vtkScaledSOADataArrayTemplate_h
#define vtkScaledSOADataArrayTemplate_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkGenericDataArray.h"
#include "vtkBuffer.h"

// The export macro below makes no sense, but is necessary for older compilers
// when we export instantiations of this class from vtkCommonCore.
template <class ValueTypeT>
class VTKCOMMONCORE_EXPORT vtkScaledSOADataArrayTemplate :
    public vtkGenericDataArray<vtkScaledSOADataArrayTemplate<ValueTypeT>, ValueTypeT>
{
  typedef vtkGenericDataArray<vtkScaledSOADataArrayTemplate<ValueTypeT>, ValueTypeT>
          GenericDataArrayType;
public:
  typedef vtkScaledSOADataArrayTemplate<ValueTypeT> SelfType;
  vtkTemplateTypeMacro(SelfType, GenericDataArrayType)
  typedef typename Superclass::ValueType ValueType;

  enum DeleteMethod
  {
    VTK_DATA_ARRAY_FREE=vtkAbstractArray::VTK_DATA_ARRAY_FREE,
    VTK_DATA_ARRAY_DELETE=vtkAbstractArray::VTK_DATA_ARRAY_DELETE,
    VTK_DATA_ARRAY_ALIGNED_FREE=vtkAbstractArray::VTK_DATA_ARRAY_ALIGNED_FREE,
    VTK_DATA_ARRAY_USER_DEFINED=vtkAbstractArray::VTK_DATA_ARRAY_USER_DEFINED
  };

  static vtkScaledSOADataArrayTemplate* New();

  //@{
  /**
   * Set/Get the Scale value for the object. The default is 1.
   */
  inline void SetScale(ValueType scale)
  {
    vtkDebugMacro(<< this->GetClassName() << ": setting Scale to " << scale);
    if (scale != this->Scale)
    {
      if (scale == 0)
      {
        vtkErrorMacro("Cannot set Scale to 0");
      }
      else
      {
        this->Scale = scale;
        this->Modified();
      }
    }
  }
  inline ValueType GetScale() const
  {
    vtkDebugMacro(<< this->GetClassName() << ": returning Scale of " << this->Scale );
    return this->Scale;
  }
  //@}


  //@{
  /**
   * Get the value at @a valueIdx. @a valueIdx assumes AOS ordering.
   */
  inline ValueType GetValue(vtkIdType valueIdx) const
  {
    vtkIdType tupleIdx;
    int comp;
    this->GetTupleIndexFromValueIndex(valueIdx, tupleIdx, comp);
    return this->GetTypedComponent(tupleIdx, comp);
  }
  //@}

  //@{
  /**
   * Set the value at @a valueIdx to @a value. @a valueIdx assumes AOS ordering.
   */
  inline void SetValue(vtkIdType valueIdx, ValueType value)
  {
    vtkIdType tupleIdx;
    int comp;
    this->GetTupleIndexFromValueIndex(valueIdx, tupleIdx, comp);
    this->SetTypedComponent(tupleIdx, comp, value);
  }
  //@}

  /**
   * Copy the tuple at @a tupleIdx into @a tuple.
   */
  inline void GetTypedTuple(vtkIdType tupleIdx, ValueType* tuple) const
  {
    for (size_t cc=0; cc < this->Data.size(); cc++)
    {
      tuple[cc] = this->Data[cc]->GetBuffer()[tupleIdx] * this->Scale;
    }
  }

  /**
   * Set this array's tuple at @a tupleIdx to the values in @a tuple.
   */
  inline void SetTypedTuple(vtkIdType tupleIdx, const ValueType* tuple)
  {
    for (size_t cc=0; cc < this->Data.size(); ++cc)
    {
      this->Data[cc]->GetBuffer()[tupleIdx] = tuple[cc] / this->Scale;
    }
  }

  /**
   * Get component @a comp of the tuple at @a tupleIdx.
   */
  inline ValueType GetTypedComponent(vtkIdType tupleIdx, int comp) const
  {
    return this->Data[comp]->GetBuffer()[tupleIdx] * this->Scale;
  }

  /**
   * Set component @a comp of the tuple at @a tupleIdx to @a value.
   */
  inline void SetTypedComponent(vtkIdType tupleIdx, int comp, ValueType value)
  {
    this->Data[comp]->GetBuffer()[tupleIdx] = value / this->Scale;
  }

  /**
   * Set component @a comp of all tuples to @a value.
   */
  void FillTypedComponent(int compIdx, ValueType value) override;

  /**
   * Use this API to pass externally allocated memory to this instance. Since
   * vtkScaledSOADataArrayTemplate uses separate contiguous regions for each
   * component, use this API to add arrays for each of the component.
   * \c save: When set to true, vtkScaledSOADataArrayTemplate will not release or
   * realloc the memory even when the AllocatorType is set to RESIZABLE. If
   * needed it will simply allow new memory buffers and "forget" the supplied
   * pointers. When save is set to false, this will be the \c deleteMethod
   * specified to release the array.
   * If updateMaxId is true, the array's MaxId will be updated, and assumes
   * that size is the number of tuples in the array.
   * \c size is specified in number of elements of ScalarType.
   */
  void SetArray(int comp, VTK_ZEROCOPY ValueType* array, vtkIdType size,
                bool updateMaxId = false, bool save=false,
                int deleteMethod=VTK_DATA_ARRAY_FREE);

  /**
    * This method allows the user to specify a custom free function to be
    * called when the array is deallocated. Calling this method will implicitly
    * mean that the given free function will be called when the class
    * cleans up or reallocates memory. This custom free function will be
    * used for all components.
  **/
  void SetArrayFreeFunction(void (*callback)(void *)) override;

  /**
    * This method allows the user to specify a custom free function to be
    * called when the array is deallocated. Calling this method will implicitly
    * mean that the given free function will be called when the class
    * cleans up or reallocates memory.
  **/
  void SetArrayFreeFunction(int comp, void (*callback)(void *));

  /**
   * Return a pointer to a contiguous block of memory containing all values for
   * a particular components (ie. a single array of the struct-of-arrays). Note
   * that this is to raw memory and no scaling of the data is done here.
   */
  ValueType* GetComponentArrayPointer(int comp);

  /**
   * Use of this method is discouraged, it creates a deep copy of the data into
   * a contiguous AoS-ordered buffer and prints a warning.
   */
  void *GetVoidPointer(vtkIdType valueIdx) override;

  /**
   * Export a copy of the data in AoS ordering to the preallocated memory
   * buffer.
   */
  void ExportToVoidPointer(void *ptr) override;

#ifndef __VTK_WRAP__
  //@{
  /**
   * Perform a fast, safe cast from a vtkAbstractArray to a vtkDataArray.
   * This method checks if source->GetArrayType() returns DataArray
   * or a more derived type, and performs a static_cast to return
   * source as a vtkDataArray pointer. Otherwise, nullptr is returned.
   */
  static vtkScaledSOADataArrayTemplate<ValueType>*
  FastDownCast(vtkAbstractArray *source)
  {
    if (source)
    {
      switch (source->GetArrayType())
      {
        case vtkAbstractArray::ScaleSoADataArrayTemplate:
          if (vtkDataTypesCompare(source->GetDataType(),
                                  vtkTypeTraits<ValueType>::VTK_TYPE_ID))
          {
            return static_cast<vtkScaledSOADataArrayTemplate<ValueType>*>(source);
          }
          break;
      }
    }
    return nullptr;
  }
  //@}
#endif

  int GetArrayType() override {return vtkAbstractArray::ScaleSoADataArrayTemplate;}
  VTK_NEWINSTANCE vtkArrayIterator *NewIterator() override;
  void SetNumberOfComponents(int numComps) override;
  void ShallowCopy(vtkDataArray *other) override;

  // Reimplemented for efficiency:
  void InsertTuples(vtkIdType dstStart, vtkIdType n, vtkIdType srcStart,
                    vtkAbstractArray* source) override;
  // MSVC doesn't like 'using' here (error C2487). Just forward instead:
  // using Superclass::InsertTuples;
  void InsertTuples(vtkIdList *dstIds, vtkIdList *srcIds,
                    vtkAbstractArray *source) override
  { this->Superclass::InsertTuples(dstIds, srcIds, source); }

protected:
  vtkScaledSOADataArrayTemplate();
  ~vtkScaledSOADataArrayTemplate() override;

  /**
   * Allocate space for numTuples. Old data is not preserved. If numTuples == 0,
   * all data is freed.
   */
  bool AllocateTuples(vtkIdType numTuples);

  /**
   * Allocate space for numTuples. Old data is preserved. If numTuples == 0,
   * all data is freed.
   */
  bool ReallocateTuples(vtkIdType numTuples);

  std::vector<vtkBuffer<ValueType>*> Data;
  vtkBuffer<ValueType> *AoSCopy;

  double NumberOfComponentsReciprocal;

private:
  vtkScaledSOADataArrayTemplate(const vtkScaledSOADataArrayTemplate&) = delete;
  void operator=(const vtkScaledSOADataArrayTemplate&) = delete;

  inline void GetTupleIndexFromValueIndex(vtkIdType valueIdx,
                                          vtkIdType& tupleIdx, int& comp) const
  {
    tupleIdx = static_cast<vtkIdType>(valueIdx *
                                      this->NumberOfComponentsReciprocal);
    comp = valueIdx - (tupleIdx * this->NumberOfComponents);
  }

  friend class vtkGenericDataArray<vtkScaledSOADataArrayTemplate<ValueTypeT>,
                                   ValueTypeT>;
  /**
   * The value to scale the data stored in memory by.
   */
  ValueType Scale;
};

// Declare vtkArrayDownCast implementations for scale SoA containers:
vtkArrayDownCast_TemplateFastCastMacro(vtkScaledSOADataArrayTemplate)

#endif // header guard

// This portion must be OUTSIDE the include blockers. This is used to tell
// libraries other than vtkCommonCore that instantiations of
// vtkScaledSOADataArrayTemplate can be found externally. This prevents each library
// from instantiating these on their own.
#ifdef VTK_SCALED_SOA_DATA_ARRAY_TEMPLATE_INSTANTIATING
#define VTK_SCALED_SOA_DATA_ARRAY_TEMPLATE_INSTANTIATE(T) \
  template class VTKCOMMONCORE_EXPORT vtkScaledSOADataArrayTemplate< T >
#elif defined(VTK_USE_EXTERN_TEMPLATE)
#ifndef VTK_SCALED_SOA_DATA_ARRAY_TEMPLATE_EXTERN
#define VTK_SCALED_SOA_DATA_ARRAY_TEMPLATE_EXTERN
#ifdef _MSC_VER
#pragma warning (push)
// The following is needed when the vtkScaledSOADataArrayTemplate is declared
// dllexport and is used from another class in vtkCommonCore
#pragma warning (disable: 4910) // extern and dllexport incompatible
#endif
vtkExternTemplateMacro(
  extern template class VTKCOMMONCORE_EXPORT vtkScaledSOADataArrayTemplate)
#ifdef _MSC_VER
#pragma warning (pop)
#endif
#endif // VTK_SCALED_SOA_DATA_ARRAY_TEMPLATE_EXTERN

// The following clause is only for MSVC 2008 and 2010
#elif defined(_MSC_VER) && !defined(VTK_BUILD_SHARED_LIBS)
#pragma warning (push)

// C4091: 'extern ' : ignored on left of 'int' when no variable is declared
#pragma warning (disable: 4091)

// Compiler-specific extension warning.
#pragma warning (disable: 4231)

// We need to disable warning 4910 and do an extern dllexport
// anyway.  When deriving new arrays from an
// instantiation of this template the compiler does an explicit
// instantiation of the base class.  From outside the vtkCommon
// library we block this using an extern dllimport instantiation.
// For classes inside vtkCommon we should be able to just do an
// extern instantiation, but VS 2008 complains about missing
// definitions.  We cannot do an extern dllimport inside vtkCommon
// since the symbols are local to the dll.  An extern dllexport
// seems to be the only way to convince VS 2008 to do the right
// thing, so we just disable the warning.
#pragma warning (disable: 4910) // extern and dllexport incompatible

// Use an "extern explicit instantiation" to give the class a DLL
// interface.  This is a compiler-specific extension.
vtkInstantiateTemplateMacro(
  extern template class VTKCOMMONCORE_EXPORT vtkScaledSOADataArrayTemplate)

#pragma warning (pop)

#endif

// VTK-HeaderTest-Exclude: vtkScaledSOADataArrayTemplate.h
