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

  Program:   Visualization Toolkit
  Module:    vtkPriorityQueue.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.

=========================================================================*/
#ifndef vtkPriorityQueue_h
#define vtkPriorityQueue_h

#include "vtkCommonCoreModule.h" // For export macro
#include "vtkObject.h"

#include "vtkIdTypeArray.h" // Needed for inline methods

class VTKCOMMONCORE_EXPORT vtkPriorityQueue : public vtkObject
{
public:
  //BTX
  class Item
  {
  public:
    double priority;
    vtkIdType id;
  };
  //ETX

  static vtkPriorityQueue *New();

  vtkTypeMacro(vtkPriorityQueue,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  void Allocate(const vtkIdType sz, const vtkIdType ext=1000);

  void Insert(double priority, vtkIdType id);

//BTX

  vtkIdType Pop(vtkIdType location, double &priority);
//ETX

  vtkIdType Pop(vtkIdType location=0);

//BTX

  vtkIdType Peek(vtkIdType location, double &priority);
//ETX

  vtkIdType Peek(vtkIdType location=0);

  double DeleteId(vtkIdType id);

  double GetPriority(vtkIdType id);

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

  void Reset();

protected:
  vtkPriorityQueue();
  ~vtkPriorityQueue();

  Item *Resize(const vtkIdType sz);

  vtkIdTypeArray *ItemLocation;
  Item *Array;
  vtkIdType Size;
  vtkIdType MaxId;
  vtkIdType Extend;
private:
  vtkPriorityQueue(const vtkPriorityQueue&);  // Not implemented.
  void operator=(const vtkPriorityQueue&);  // Not implemented.
};

inline double vtkPriorityQueue::DeleteId(vtkIdType id)
{
  double priority=VTK_DOUBLE_MAX;
  int loc;

  if ( id <= this->ItemLocation->GetMaxId() &&
  (loc=this->ItemLocation->GetValue(id)) != -1 )
    {
    this->Pop(loc,priority);
    }
  return priority;
}

inline double vtkPriorityQueue::GetPriority(vtkIdType id)
{
  int loc;

  if ( id <= this->ItemLocation->GetMaxId() &&
  (loc=this->ItemLocation->GetValue(id)) != -1 )
    {
    return this->Array[loc].priority;
    }
  return VTK_DOUBLE_MAX;
}

inline vtkIdType vtkPriorityQueue::Peek(vtkIdType location, double &priority)
{
  if ( this->MaxId < 0 )
    {
    return -1;
    }
  else
    {
    priority = this->Array[location].priority;
    return this->Array[location].id;
    }
}

inline vtkIdType vtkPriorityQueue::Peek(vtkIdType location)
{
  if ( this->MaxId < 0 )
    {
    return -1;
    }
  else
    {
    return this->Array[location].id;
    }
}

#endif