/*
 *
 *  Copyright (C) 1998-2012, OFFIS e.V.
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation were developed by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module: dcmpstat
 *
 *  Author: Marco Eichelberg
 *
 *  Purpose:
 *    classes: DVPSReferencedImage
 *
 */

#ifndef DVPSRI_H
#define DVPSRI_H

#include "dcmtk/config/osconfig.h"    /* make sure OS specific configuration is included first */
#include "dcmtk/dcmpstat/dpdefine.h"
#include "dcmtk/dcmdata/dcvrui.h"
#include "dcmtk/dcmdata/dcvris.h"

/** an item of the referenced image sequence in a presentation state (internal use only).
 *  This class manages the data structures comprising one item
 *  of the Reference Image Sequence which is contained
 *  in the Referenced Series Sequence in a Presentation State object.
 */

class DCMTK_DCMPSTAT_EXPORT DVPSReferencedImage
{
public:
  /// default constructor
  DVPSReferencedImage();

  /// copy constructor
  DVPSReferencedImage(const DVPSReferencedImage& copy);

  /** clone method.
   *  @return a pointer to a new DVPSReferencedImage object containing
   *  a copy of this object.
   */
  DVPSReferencedImage *clone() { return new DVPSReferencedImage(*this); }

  /// destructor
  virtual ~DVPSReferencedImage();

  /** reads an image reference from a DICOM dataset.
   *  The DICOM elements of the referenced image item are copied
   *  from the dataset to this object.
   *  The completeness of the item (presence of all required elements,
   *  value multiplicity) is checked.
   *  If this method returns an error code, the object is in undefined state afterwards.
   *  @param dset the item of the ReferencedImageSequence from which the data is to be read
   *  @return EC_Normal if successful, an error code otherwise.
   */
  OFCondition read(DcmItem &dset);

  /** writes the image reference managed by this object to a DICOM dataset.
   *  Copies of the DICOM element managed by this object are inserted into
   *  the DICOM dataset.
   *  @param dset the the item of the ReferencedImageSequence to which the data is written
   *  @return EC_Normal if successful, an error code otherwise.
   */
  OFCondition write(DcmItem &dset);

  /** check if the passed SOP Class UID is equal to the one stored in this object.
   *  If sopclassuid is empty, the referencedSOPClassUID is assigned to it and the method returns
   *  OFTrue. Otherwise the passed UID is compared with the referencedSOPClassUID.
   *  OFTrue is returned if they are equal, OFFalse otherwise.
   *  This method is used to check whether all image references in a presentation state
   *  share the same SOP Class UID.
   *  @param sopclassuid the SOP class UID to be validated
   *  @return OFTrue if successful, OFFalse if unsuccessful.
   */
  OFBool validateSOPClassUID(OFString& sopclassuid);

  /** set SOP Class UID of this image reference.
   *  @param uid a pointer to the UID, which is copied into this object.
   */
  void setSOPClassUID(const char *uid);

  /** set SOP Instance UID of this image reference.
   *  @param uid a pointer to the UID, which is copied into this object.
   */
  void setSOPInstanceUID(const char *uid);

  /** set the list of frame numbers of this image reference.
   *  @param frames a list of frame numbers in DICOM IS format
   *    (integer numbers separated by '\' characters)
   */
  void setFrameNumbers(const char *frames);

  /** compare SOP Instance UID.
   *  @param uid the UID to be compared
   *  @return OFTrue if the referencedSOPInstanceUID of this object is
   *    equal to uid, OFFalse otherwise.
   */
  OFBool isSOPInstanceUID(const char *uid);

  /** gets the image reference managed by this object.
   *  @param sopclassUID the SOP Class UID is returned in this string
   *  @param instanceUID the SOP Instance UID is returned in this string
   *  @param frames the list of frames is returned in this string
   *  @return EC_Normal if successful, an error code otherwise.
   */
  OFCondition getImageReference(
    OFString& sopclassUID,
    OFString& instanceUID,
    OFString& frames);

  /** checks whether this image reference applies to the given frame number.
   *  An image reference applies to a frame if the frame number is explicitly
   *  listed in the referencedFrameNumber attribute or if the referencedFrameNumber
   *  is empty.
   *  @param frame frame number to be checked
   *  @return OFTrue if the image reference applies to the given frame number, OFFalse otherwise.
   */
  OFBool appliesToFrame(unsigned long frame);

  /** checks whether this image reference applies exactly to the given frame number.
   *  This is the case if the referencedFrameNumber only contains the given frame number.
   *  @param frame frame number to be checked
   *  @return OFTrue if the image reference applies only to the given frame number, OFFalse otherwise.
   */
  OFBool appliesOnlyToFrame(unsigned long frame);

  /** checks whether this image reference applies all frames
   *  because the referencedFrameNumber is empty.
   *  @return OFTrue if the image reference applies to all frames, OFFalse otherwise.
   */
  OFBool appliesToAllFrames();

  /** update the reference such that the given frame is not referenced any more.
   *  @param frame the frame reference
   *  @param numberOfFrames the number of frames of the image reference
   */
  void removeFrameReference(unsigned long frame, unsigned long numberOfFrames);

private:

  /** undefined private assignment operator
   */
  DVPSReferencedImage& operator=(const DVPSReferencedImage& source);

  /** flushes the frame cache.
   */
  void flushCache();
  /** updated the frame cache.
   */
  void updateCache();

  /// VR=UI, VM=1, Type 1c
  DcmUniqueIdentifier      referencedSOPClassUID;
  /// VR=UI, VM=1, Type 1c
  DcmUniqueIdentifier      referencedSOPInstanceUID;
  /// VR=IS, VM=1-n, Type 1c
  DcmIntegerString         referencedFrameNumber;
  /// if exists, contains binary representation of referencedFrameNumber
  Sint32 *frameCache;
  /// describes array size of frameCache
  unsigned long frameCacheEntries;

};

#endif