// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
/**
 * @class   vtkVariantArray
 * @brief   An array holding vtkVariants.
 *
 *
 *
 * @par Thanks:
 * Thanks to Patricia Crossno, Ken Moreland, Andrew Wilson and Brian Wylie from
 * Sandia National Laboratories for their help in developing this class.
 */

#ifndef vtkVariantArray_h
#define vtkVariantArray_h

#include "vtkAbstractArray.h"
#include "vtkCommonCoreModule.h" // For export macro
#include "vtkVariant.h"          // For variant type
#include "vtkWrappingHints.h"    // For VTK_MARSHALMANUAL

/// Forward declaration required for Boost serialization
namespace boost
{
namespace serialization
{
class access;
}
}

VTK_ABI_NAMESPACE_BEGIN
class vtkVariantArrayLookup;

class VTKCOMMONCORE_EXPORT VTK_MARSHALMANUAL vtkVariantArray : public vtkAbstractArray
{

  /// Friendship required for Boost serialization
  friend class boost::serialization::access;

public:
  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
  };
  using ArrayTypeTag = std::integral_constant<int, vtkArrayTypes::VTK_VARIANT_ARRAY>;
  using DataTypeTag = std::integral_constant<int, VTK_VARIANT>;
  using ValueType = vtkVariant;

  static vtkVariantArray* New();
  static vtkVariantArray* ExtendedNew();
  vtkTypeMacro(vtkVariantArray, vtkAbstractArray);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Perform a fast, safe cast from a vtkAbstractArray to a vtkVariantArray.
   * This method checks if source->GetArrayType() returns VariantArray,
   * and performs a static_cast to return source as a vtkVariantArray pointer.
   * Otherwise, nullptr is returned.
   */
  static vtkVariantArray* FastDownCast(vtkAbstractArray* source);

  //
  // Functions required by vtkAbstractArray
  //

  /**
   * Allocate memory for this array. Delete old storage only if necessary.
   * Note that ext is no longer used.
   */
  vtkTypeBool Allocate(vtkIdType sz, vtkIdType ext = 1000) override;

  /**
   * Release storage and reset array to initial state.
   */
  void Initialize() override;

  /**
   * Copy one component from \a src into a (potentially different) component
   * of this array. Note that \a src must be a vtkStringArray.
   */
  bool CopyComponent(int dstComponent, vtkAbstractArray* src, int srcComponent) override;

  /**
   * Return the array type.
   */
  int GetArrayType() const override { return vtkVariantArray::ArrayTypeTag::value; }

  /**
   * Return the underlying data type. An integer indicating data type is
   * returned as specified in vtkSetGet.h.
   */
  int GetDataType() const override;

  /**
   * Return the size of the underlying data type.  For a bit, 1 is
   * returned.  For string 0 is returned. Arrays with variable length
   * components return 0.
   */
  int GetDataTypeSize() const override;

  /**
   * Return the size, in bytes, of the lowest-level element of an
   * array.  For vtkDataArray and subclasses this is the size of the
   * data type.  For vtkStringArray, this is
   * sizeof(vtkStdString::value_type), which winds up being
   * sizeof(char).
   */
  int GetElementComponentSize() const override;

  /**
   * Set the number of tuples (a component group) in the array. Note that
   * this may allocate space depending on the number of components.
   */
  void SetNumberOfTuples(vtkIdType number) override;

  /**
   * Set the tuple at the ith location using the jth tuple in the source array.
   * This method assumes that the two arrays have the same type
   * and structure. Note that range checking and memory allocation is not
   * performed; use in conjunction with SetNumberOfTuples() to allocate space.
   */
  void SetTuple(vtkIdType i, vtkIdType j, vtkAbstractArray* source) override;

  /**
   * Insert the jth tuple in the source array, at ith location in this array.
   * Note that memory allocation is performed as necessary to hold the data.
   */
  void InsertTuple(vtkIdType i, vtkIdType j, vtkAbstractArray* source) override;

  /**
   * Copy the tuples indexed in srcIds from the source array to the tuple
   * locations indexed by dstIds in this array.
   * Note that memory allocation is performed as necessary to hold the data.
   */
  void InsertTuples(vtkIdList* dstIds, vtkIdList* srcIds, vtkAbstractArray* source) override;

  void InsertTuplesStartingAt(
    vtkIdType dstStart, vtkIdList* srcIds, vtkAbstractArray* source) override;

  /**
   * Copy n consecutive tuples starting at srcStart from the source array to
   * this array, starting at the dstStart location.
   * Note that memory allocation is performed as necessary to hold the data.
   */
  void InsertTuples(
    vtkIdType dstStart, vtkIdType n, vtkIdType srcStart, vtkAbstractArray* source) override;

  /**
   * Insert the jth tuple in the source array, at the end in this array.
   * Note that memory allocation is performed as necessary to hold the data.
   * Returns the location at which the data was inserted.
   */
  vtkIdType InsertNextTuple(vtkIdType j, vtkAbstractArray* source) override;

  /**
   * Return a void pointer. For image pipeline interface and other
   * special pointer manipulation.
   */
  void* GetVoidPointer(vtkIdType id) override;

  /**
   * Deep copy of data. Implementation left to subclasses, which
   * should support as many type conversions as possible given the
   * data type.
   */
  void DeepCopy(vtkAbstractArray* da) override;

  /**
   * Set the ith tuple in this array as the interpolated tuple value,
   * given the ptIndices in the source array and associated
   * interpolation weights.
   * This method assumes that the two arrays are of the same type
   * and structure.
   */
  void InterpolateTuple(
    vtkIdType i, vtkIdList* ptIndices, vtkAbstractArray* source, double* weights) override;

  /**
   * Insert the ith tuple in this array as interpolated from the two values,
   * p1 and p2, and an interpolation factor, t.
   * The interpolation factor ranges from (0,1),
   * with t=0 located at p1. This method assumes that the three arrays are of
   * the same type. p1 is value at index id1 in source1, while, p2 is
   * value at index id2 in source2.
   */
  void InterpolateTuple(vtkIdType i, vtkIdType id1, vtkAbstractArray* source1, vtkIdType id2,
    vtkAbstractArray* source2, double t) override;

  /**
   * Free any unnecessary memory.
   * Description:
   * Resize object to just fit data requirement. Reclaims extra memory.
   */
  void Squeeze() override;

  /**
   * Resize the array while conserving the data.  Returns 1 if
   * resizing succeeded and 0 otherwise.
   */
  vtkTypeBool Resize(vtkIdType numTuples) override;

  ///@{
  /**
   * This method lets the user specify data to be held by the array.  The
   * array argument is a pointer to the data.  size is the size of
   * the array supplied by the user.  Set save to 1 to keep the class
   * from deleting the array when it cleans up or reallocates memory.
   * The class uses the actual array provided; it does not copy the data
   * from the supplied array.
   */
  void SetVoidArray(void* arr, vtkIdType size, int save) override;
  void SetVoidArray(void* arr, vtkIdType size, int save, int deleteM) override;
  ///@}

  /**
   * Return the memory in kibibytes (1024 bytes) consumed by this data array. Used to
   * support streaming and reading/writing data. The value returned is
   * guaranteed to be greater than or equal to the memory required to
   * actually represent the data represented by this object. The
   * information returned is valid only after the pipeline has
   * been updated.
   */
  unsigned long GetActualMemorySize() const override;

  /**
   * Since each item can be of a different type, we say that a variant array is not numeric.
   */
  int IsNumeric() const override;

  /**
   * Subclasses must override this method and provide the right
   * kind of templated vtkArrayIteratorTemplate.
   */
  VTK_NEWINSTANCE vtkArrayIterator* NewIterator() override;

  //
  // Additional functions
  //

  /**
   * Get the data at a particular index.
   */
  ValueType& GetValue(vtkIdType id) const;

  /**
   * Set the data at a particular index. Does not do range checking. Make sure
   * you use the method SetNumberOfValues() before inserting data.
   */
  void SetValue(vtkIdType id, ValueType value)
    VTK_EXPECTS(0 <= id && id < this->GetNumberOfValues());

  /**
   * If id < GetNumberOfValues(), overwrite the array at that index.
   * If id >= GetNumberOfValues(), expand the array size to id+1
   * and set the final value to the specified value.
   */
  void InsertValue(vtkIdType id, ValueType value) VTK_EXPECTS(0 <= id);

  /**
   * Insert a value into the array from a variant.
   */
  void SetVariantValue(vtkIdType idx, ValueType value) override;

  /**
   * Safely insert a value into the array from a variant.
   */
  void InsertVariantValue(vtkIdType idx, ValueType value) override;

  /**
   * Expand the array by one and set the value at that location.
   * Return the array index of the inserted value.
   */
  vtkIdType InsertNextValue(ValueType value);

  /**
   * Return a pointer to the location in the internal array at the specified index.
   */
  vtkVariant* GetPointer(vtkIdType id);

  /**
   * Set the internal array used by this object.
   */
  void SetArray(ValueType* arr, vtkIdType size, int save, int deleteMethod = VTK_DATA_ARRAY_DELETE);

  /**
   * 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(void (*callback)(void*)) override;

  /**
   * Return the number of values in the array.
   */
  vtkIdType GetNumberOfValues() const { return (this->MaxId + 1); }

  ///@{
  /**
   * Return the indices where a specific value appears.
   */
  vtkIdType LookupValue(ValueType value) override;
  void LookupValue(ValueType value, vtkIdList* ids) override;
  ///@}

  /**
   * Tell the array explicitly that the data has changed.
   * This is only necessary to call when you modify the array contents
   * without using the array's API (i.e. you retrieve a pointer to the
   * data and modify the array contents).  You need to call this so that
   * the fast lookup will know to rebuild itself.  Otherwise, the lookup
   * functions will give incorrect results.
   */
  void DataChanged() override;

  /**
   * Tell the array explicitly that a single data element has
   * changed. Like DataChanged(), then is only necessary when you
   * modify the array contents without using the array's API.
   */
  virtual void DataElementChanged(vtkIdType id);

  /**
   * Delete the associated fast lookup data structure on this array,
   * if it exists.  The lookup will be rebuilt on the next call to a lookup
   * function.
   */
  void ClearLookup() override;

  /**
   * This destructor is public to work around a bug in version 1.36.0 of
   * the Boost.Serialization library.
   */
  ~vtkVariantArray() override;

protected:
  // Construct object with default tuple dimension (number of components) of 1.
  vtkVariantArray();

  // Pointer to data

  ValueType* Array;

  // Function to resize data
  ValueType* ResizeAndExtend(vtkIdType sz);

  void (*DeleteFunction)(void*);

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

  vtkVariantArrayLookup* Lookup;
  void UpdateLookup();
};

// Declare vtkArrayDownCast implementations for vtkVariantArray:
vtkArrayDownCast_FastCastMacro(vtkVariantArray);

VTK_ABI_NAMESPACE_END
#endif
