//======================================================================
// Class PndEmcTwoCoordIndex
//
//	 Software developed for the BaBar Detector at the SLAC B-Factory.
// Adapted for the PANDA experiment at GSI		
//		
// Class to hold coordinate and index information
// for system in which two co-ordinates specifies a channel uniquely.
// (Simplified version of class taken from BABAR framework)
// It is convenient to use 2-coordinate index to describe barel part of EMC
// to search for neigbour crystals in clustering algorithms
// 
//
//  Author List:
//
//         Phil Strother                         Imperial College
//         Stephen J. Gowdy                      University of Edinburgh
// Dima Melnichuk - adaption for PANDA							
// 
//======================================================================
//#pragma once
#ifndef PNDEMCTWOCOORDINDEX_H
#define PNDEMCTWOCOORDINDEX_H

//---------------
// C++ Headers --
//---------------
#include "iostream"
#include "stdlib.h"
//#include <vector>
#include "TObject.h"
#include "PndEmcDataTypes.h"

using std::cout;
using std::endl;

/**
 * @brief stores crystal index coordinates (x,y) or (theta,phi)
 * @ingroup PndEmc
 */
class PndEmcTwoCoordIndex: public TObject
{
public:

	// Constructors
	PndEmcTwoCoordIndex();
	PndEmcTwoCoordIndex( long theXcoord, long theYcoord, long theIndex );
	
	// Destructors
	
	// destructor in base class
	virtual ~PndEmcTwoCoordIndex();
	
	
	// Operators
	bool operator==( const PndEmcTwoCoordIndex& c ) const { return fIndex==c.fIndex; }
	bool operator!=( const PndEmcTwoCoordIndex& c ) const { return fIndex!=c.fIndex; }

	bool operator<( const PndEmcTwoCoordIndex& ) const;
  
	virtual const PndEmcCoordIndexSet GetNeighbours() const;
	 
	long XCoord() const      {return fCoords[0];}
	long YCoord() const      {return fCoords[1];}
	long Index() const       {return fIndex;}
	
	virtual void AddToNeighbourList(PndEmcTwoCoordIndex *);
	
	//check if 2 tci are neigbour or not
	bool IsNeighbour(PndEmcTwoCoordIndex* _tci);


protected:
	long fCoords[2];
	long fIndex;
	PndEmcCoordIndexSet fNeighbours; 

private:
      
   ClassDef(PndEmcTwoCoordIndex,1)
};

#endif // PNDEMCTWOCOORDINDEX_HH