/**
 * @file
 * @author Christian Simon <csimon@physi.uni-heidelberg.de>
 * @since 2017-08-07
 */

#ifndef CBMDAQPOINTBUFFER_H
#define CBMDAQPOINTBUFFER_H 1

#include <map>
#include <string>
#include <vector>

#include "CbmDefs.h"

class FairMCPoint;

/**
 * @brief ...
 * @author Christian Simon <csimon@physi.uni-heidelberg.de>
 * @since 2017-08-07
 * @version 1.0
 * @details ...
 */
class CbmDaqPointBuffer
{
  public:

    /**   Destructor  **/
     ~CbmDaqPointBuffer();


    /** Removes all points from the beginning to the current position of the
     ** iterator (all those accessed by GetNextData before).
     **/
    void Clear();


    /** Time of first data for all detectors
     ** @return time of first data [ns]
     **/
    Double_t GetFirstTime() const;


    /** Time of first data for a given detector
     ** @param iDet  detector type (e.g. kSTS)
     ** @return time of first data [ns]
     */
    Double_t GetFirstTime(Int_t iDet) const;


    /** Time of last data for all detectors
     ** @return time of last data [ns]
     **/
    Double_t GetLastTime() const;


    /** Time of last data for a given detector
     ** @param iDet  detector type (e.g. kSTS)
     ** @return time of last data [ns]
     */
    Double_t GetLastTime(Int_t iDet) const;


    /** Pointer to next MC point object for a given detector
     ** @param iDet  detector type (ECbmModuleId)
     ** @return pointer to MC point object
     **/
    FairMCPoint* GetNextData(Int_t iDet);


    /** Pointer to next MC point object for a given detector
     ** up to given time
     ** @param iDet  detector type (e.g. kSTS)
     ** @param time  maximal time [ns]
     ** @return pointer to MC point object
     **/
    FairMCPoint* GetNextData(Int_t iDet, Double_t time);


    /** Current buffer size
     ** @return number of objects in buffer
     */
    Int_t GetSize() const;


    /** Current buffer size for given detector
     ** @param  det  Detector system (e.g. kSTS)
     ** @return number of objects in buffer
     */
    Int_t GetSize(Int_t det) const;


    /** Insert data into the buffer
     ** @param point  pointer to data object to be inserted
     **/
    void InsertData(Int_t iDet, FairMCPoint* point);


    /**   Access to singleton instance
     ** @return pointer to instance
     **/
    static CbmDaqPointBuffer* Instance();


    /**   Print buffer status  **/
    void PrintStatus() const;


    /**   Status string  **/
    std::string ToString() const;


  private:


    /** Buffer management **/
    std::multimap<Double_t, FairMCPoint*> fData[kNofSystems];


    /** Pointer to singleton instance **/
    static CbmDaqPointBuffer* fgInstance;


    /**  Default constructor
     **  Declared private to prevent instantiation.
     **/
    CbmDaqPointBuffer();


    /**  Copy constructor. Defined private to prevent usage. **/
    CbmDaqPointBuffer(const CbmDaqPointBuffer&);


    /**  Assignment operator. Defined private to prevent usage. **/
    CbmDaqPointBuffer& operator=(const CbmDaqPointBuffer&);



};

#endif