// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
 * @class   vtkImageReader
 * @brief   Superclass of transformable binary file readers.
 *
 * vtkImageReader provides methods needed to read a region from a file.
 * It supports both transforms and masks on the input data, but as a result
 * is more complicated and slower than its parent class vtkImageReader2.
 *
 * @sa
 * vtkBMPReader vtkPNMReader vtkTIFFReader
 */

#ifndef vtkImageReader_h
#define vtkImageReader_h

#include "vtkIOImageModule.h" // For export macro
#include "vtkImageReader2.h"

VTK_ABI_NAMESPACE_BEGIN
class vtkTransform;

#define VTK_FILE_BYTE_ORDER_BIG_ENDIAN 0
#define VTK_FILE_BYTE_ORDER_LITTLE_ENDIAN 1

class VTKIOIMAGE_EXPORT vtkImageReader : public vtkImageReader2
{
public:
  static vtkImageReader* New();
  vtkTypeMacro(vtkImageReader, vtkImageReader2);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  ///@{
  /**
   * Set/get the data VOI. You can limit the reader to only
   * read a subset of the data.
   */
  vtkSetVector6Macro(DataVOI, int);
  vtkGetVector6Macro(DataVOI, int);
  ///@}

  ///@{
  /**
   * Set/Get the Data mask.  The data mask is a simply integer whose bits are
   * treated as a mask to the bits read from disk.  That is, the data mask is
   * bitwise-and'ed to the numbers read from disk.  This ivar is stored as 64
   * bits, the largest mask you will need.  The mask will be truncated to the
   * data size required to be read (using the least significant bits).
   */
  vtkGetMacro(DataMask, vtkTypeUInt64);
  vtkSetMacro(DataMask, vtkTypeUInt64);
  ///@}

  ///@{
  /**
   * Set/Get transformation matrix to transform the data from slice space
   * into world space. This matrix must be a permutation matrix. To qualify,
   * the sums of the rows must be + or - 1.
   */
  virtual void SetTransform(vtkTransform*);
  vtkGetObjectMacro(Transform, vtkTransform);
  ///@}

  // Warning !!!
  // following should only be used by methods or template helpers, not users
  void ComputeInverseTransformedExtent(int inExtent[6], int outExtent[6]);
  void ComputeInverseTransformedIncrements(vtkIdType inIncr[3], vtkIdType outIncr[3]);

  int OpenAndSeekFile(int extent[6], int slice);

  /**
   * Return an offset to seek with a stream depending
   * on provided data extent, idx and current header size
   */
  vtkTypeInt64 ComputeStartOffset(int dataExtent[6], int idx);

  ///@{
  /**
   * Set/get the scalar array name for this data set.
   */
  vtkSetStringMacro(ScalarArrayName);
  vtkGetStringMacro(ScalarArrayName);
  ///@}

  /**
   * vtkImageReader itself can read raw binary files. That being the case,
   * we need to implement `CanReadFile` to return success for any file.
   * Subclasses that read specific file format should override and implement
   * appropriate checks for file format.
   */
  int CanReadFile(VTK_FILEPATH const char*) override
  {
    return 1; // I think I can read the file but I cannot prove it
  }

protected:
  vtkImageReader();
  ~vtkImageReader() override;

  vtkTypeUInt64 DataMask;

  vtkTransform* Transform;

  void ComputeTransformedSpacing(double Spacing[3]);
  void ComputeTransformedOrigin(double origin[3]);
  void ComputeTransformedExtent(int inExtent[6], int outExtent[6]);
  void ComputeTransformedIncrements(vtkIdType inIncr[3], vtkIdType outIncr[3]);

  int DataVOI[6];

  char* ScalarArrayName;

  int RequestInformation(vtkInformation* request, vtkInformationVector** inputVector,
    vtkInformationVector* outputVector) override;

  void ExecuteDataWithInformation(vtkDataObject* data, vtkInformation* outInfo) override;

private:
  vtkImageReader(const vtkImageReader&) = delete;
  void operator=(const vtkImageReader&) = delete;
};

VTK_ABI_NAMESPACE_END
#endif
