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

  Program:   Visualization Toolkit
  Module:    vtkStringArray.h
  Language:  C++

  Copyright 2004 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
  license for use of this work by or on behalf of the
  U.S. Government. Redistribution and use in source and binary forms, with
  or without modification, are permitted provided that this Notice and any
  statement of authorship are reproduced on all copies.

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

/**
 * @class   vtkStringArray
 * @brief   a vtkAbstractArray subclass for strings
 *
 * Points and cells may sometimes have associated data that are stored
 * as strings, e.g. labels for information visualization projects.
 * This class provides a clean way to store and access those strings.
 * @par Thanks:
 * Andy Wilson (atwilso@sandia.gov) wrote this class.
*/

#ifndef vtkStringArray_h
#define vtkStringArray_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkAbstractArray.h"
#include "vtkStdString.h" // needed for vtkStdString definition

class vtkStringArrayLookup;

class VTKCOMMONCORE_EXPORT vtkStringArray : public vtkAbstractArray
{
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
  };

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

  //
  //
  // Functions required by vtkAbstractArray
  //
  //

  /**
   * Get the data type.
   */
  int GetDataType() override
    { return VTK_STRING; }

  int IsNumeric() override { return 0; }

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

  /**
   * Return the size of the data type.  WARNING: This may not mean
   * what you expect with strings.  It will return
   * sizeof(std::string) and not take into account the data
   * included in any particular string.
   */
  int GetDataTypeSize() override;

  /**
   * Free any unnecessary memory.
   * Resize object to just fit data requirement. Reclaims extra memory.
   */
  void Squeeze() override { this->ResizeAndExtend (this->MaxId+1); }

  /**
   * Resize the array while conserving the data.
   */
  vtkTypeBool Resize(vtkIdType numTuples) 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;

  /**
   * 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;

  /**
   * 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;

  /**
   * Given a list of indices, return an array of values.  You must
   * insure that the output array has been previously allocated with
   * enough space to hold the data and that the types match
   * sufficiently to allow conversion (if necessary).
   */
  void GetTuples(vtkIdList *ptIds, vtkAbstractArray *output) override;

  /**
   * Get the values for the range of indices specified (i.e.,
   * p1->p2 inclusive). You must insure that the output array has been
   * previously allocated with enough space to hold the data and that
   * the type of the output array is compatible with the type of this
   * array.
   */
  void GetTuples(vtkIdType p1, vtkIdType p2, vtkAbstractArray *output) override;

  /**
   * 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;

  /**
   * Get the data at a particular index.
   */
  vtkStdString &GetValue(vtkIdType id)
    VTK_EXPECTS(0 <= id && id < this->GetNumberOfValues());

  /**
   * 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, vtkStdString value)
    VTK_EXPECTS(0 <= id && id < this->GetNumberOfValues())
    { this->Array[id] = value; this->DataChanged(); }

  void SetValue(vtkIdType id, const char *value)
    VTK_EXPECTS(0 <= id && id < this->GetNumberOfValues())
    VTK_EXPECTS(value != nullptr);

  /**
   * 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
    { this->SetNumberOfValues(this->NumberOfComponents* number); }

  /**
   * Specify the number of values for this object to hold. Does an
   * allocation as well as setting the MaxId ivar. Used in conjunction with
   * SetValue() method for fast insertion.
   */
  void SetNumberOfValues(vtkIdType number) override;

  vtkIdType GetNumberOfValues() { return this->MaxId + 1; }

  int GetNumberOfElementComponents() { return 0; }
  int GetElementComponentSize() override { return static_cast<int>(sizeof(vtkStdString::value_type)); }

  /**
   * Insert data at a specified position in the array.
   */
  void InsertValue(vtkIdType id, vtkStdString f)
    VTK_EXPECTS(0 <= id);
  void InsertValue(vtkIdType id, const char *val)
    VTK_EXPECTS(0 <= id) VTK_EXPECTS(val != nullptr);

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

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

  /**
   * Insert data at the end of the array. Return its location in the array.
   */
  vtkIdType InsertNextValue(vtkStdString f);
  vtkIdType InsertNextValue(const char *f)
    VTK_EXPECTS(f != nullptr);

  /**
   * Get the address of a particular data index. Make sure data is allocated
   * for the number of items requested. Set MaxId according to the number of
   * data values requested.
   */
  vtkStdString* WritePointer(vtkIdType id, vtkIdType number);

  /**
   * Get the address of a particular data index. Performs no checks
   * to verify that the memory has been allocated etc.
   */
  vtkStdString* GetPointer(vtkIdType id) { return this->Array + id; }
  void* GetVoidPointer(vtkIdType id) override { return this->GetPointer(id); }

  /**
   * Deep copy of another string array.  Will complain and change nothing
   * if the array passed in is not a vtkStringArray.
   */
  void DeepCopy( vtkAbstractArray* aa ) 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. If save is 0, then this class is free to delete
   * the array when it cleans up or reallocates using the provided free function
   * If the delete method is VTK_DATA_ARRAY_USER_DEFINED
   * a custom free function can be assigned to be called using SetArrayFreeFunction,
   * if no custom function is assigned we will default to delete[].
   */
  void SetArray(vtkStdString* array, vtkIdType size, int save, int deleteMethod=VTK_DATA_ARRAY_DELETE);
  void SetVoidArray(void* array, vtkIdType size, int save) override
    { this->SetArray(static_cast<vtkStdString*>(array), size, save); }
  void SetVoidArray(void* array, vtkIdType size, int save,
                    int deleteMethod) override
    { this->SetArray(static_cast<vtkStdString*>(array), size, save, deleteMethod); }

  /**
    * 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 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.

   * This function takes into account the size of the contents of the
   * strings as well as the string containers themselves.
   */
  unsigned long GetActualMemorySize() override;

  /**
   * Returns a vtkArrayIteratorTemplate<vtkStdString>.
   */
  VTK_NEWINSTANCE vtkArrayIterator* NewIterator() override;

  /**
   * Returns the size of the data in DataTypeSize units. Thus, the number of bytes
   * for the data can be computed by GetDataSize() * GetDataTypeSize().
   * The size computation includes the string termination character for each string.
   */
  vtkIdType GetDataSize() override;

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

  vtkIdType LookupValue(const vtkStdString& value);
  void LookupValue(const vtkStdString& value, vtkIdList* ids);

  vtkIdType LookupValue(const char* value);
  void LookupValue(const char* value, vtkIdList* ids);

  /**
   * 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;

protected:
  vtkStringArray();
  ~vtkStringArray() override;

  vtkStdString* Array;   // pointer to data
  vtkStdString* ResizeAndExtend(vtkIdType sz);  // function to resize data

  void (*DeleteFunction)(void*);

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

  vtkStringArrayLookup* Lookup;
  void UpdateLookup();

};

#endif
