// 
// Base class for classes that calculate the multiplicity in the
// forward regions event-by-event
// 
#ifndef ALIFORWARDMULTIPLICITYBASE_H
#define ALIFORWARDMULTIPLICITYBASE_H
#include <AliAnalysisTaskSE.h>
#include "AliForwardUtil.h"
class AliFMDEventInspector;
class AliFMDEnergyFitter;
class AliFMDSharingFilter;
class AliFMDDensityCalculator;
class AliFMDCorrections;
class AliFMDHistCollector;
class AliESDEvent;
class TH2D;
class TList;
class TTree;


/** 
 * @mainpage ALICE PWG2 Forward Multiplcity Analysis 
 */
/** 
 * @defgroup pwg2_forward PWG2 Forward analysis
 *
 * Code to do the multiplicity analysis in the forward psuedo-rapidity
 * regions
 *
 */
/** 
 * @defgroup pwg2_forward_tasks Tasks
 *
 * Code to do the multiplicity analysis in the forward psuedo-rapidity
 * regions
 *
 * @ingroup pwg2_forward 
 */
/** 
 * Base class for classes that calculate the multiplicity in the
 * forward regions event-by-event
 * 
 * @par Inputs: 
 *   - AliESDEvent 
 *
 * @par Outputs: 
 *   - AliAODForwardMult 
 * 
 * @par Histograms 
 *   
 * @par Corrections used 
 * 
 * @ingroup pwg2_forward_tasks
 * 
 */
class AliForwardMultiplicityBase : public AliAnalysisTaskSE
{
public:
  /** 
   * @{ 
   * @name Interface methods 
   */
  /** 
   * Initialize the task 
   * 
   */
  virtual void Init() { fFirstEvent = true; }
  /** 
   * Create output objects 
   * 
   */
  virtual void UserCreateOutputObjects() = 0;
  /** 
   * Process each event 
   *
   * @param option Not used
   */  
  virtual void UserExec(Option_t* option) = 0;
  /** 
   * End of job
   * 
   * @param option Not used 
   */
  virtual void Terminate(Option_t* option) = 0;
  /** 
   * @} 
   */
  /** 
   * Print information 
   * 
   * @param option Not used
   */
  virtual void Print(Option_t* option="") const;
  /** 
   * Whether to enable low-flux code 
   * 
   * @param use IF true, enable low-flux code 
   */
  virtual void SetEnableLowFlux(Bool_t use=true) { fEnableLowFlux = use; }
  /** 
   * @{ 
   * @name Access to sub-algorithms 
   */
  /**
   * Get reference to the EventInspector algorithm 
   * 
   * @return Reference to AliFMDEventInspector object 
   */
  virtual AliFMDEventInspector& GetEventInspector() = 0;
  /**
   * Get reference to the EnergyFitter algorithm 
   * 
   * @return Reference to AliFMDEnergyFitter object 
   */
  virtual AliFMDEnergyFitter& GetEnergyFitter() = 0;
  /**
   * Get reference to the SharingFilter algorithm 
   * 
   * @return Reference to AliFMDSharingFilter object 
   */
  virtual AliFMDSharingFilter& GetSharingFilter() = 0;
  /**
   * Get reference to the DensityCalculator algorithm 
   * 
   * @return Reference to AliFMDDensityCalculator object 
   */
  virtual AliFMDDensityCalculator& GetDensityCalculator() = 0;
  /**
   * Get reference to the Corrections algorithm 
   * 
   * @return Reference to AliFMDCorrections object 
   */
  virtual AliFMDCorrections& GetCorrections() = 0;
  /**
   * Get reference to the HistCollector algorithm 
   * 
   * @return Reference to AliFMDHistCollector object 
   */
  virtual AliFMDHistCollector& GetHistCollector() = 0;
  /**
   * Get reference to the EventInspector algorithm 
   * 
   * @return Reference to AliFMDEventInspector object 
   */
  virtual const AliFMDEventInspector& GetEventInspector() const = 0;
  /**
   * Get reference to the EnergyFitter algorithm 
   * 
   * @return Reference to AliFMDEnergyFitter object 
   */
  virtual const AliFMDEnergyFitter& GetEnergyFitter() const = 0;
  /**
   * Get reference to the SharingFilter algorithm 
   * 
   * @return Reference to AliFMDSharingFilter object 
   */
  virtual const AliFMDSharingFilter& GetSharingFilter() const = 0;
  /**
   * Get reference to the DensityCalculator algorithm 
   * 
   * @return Reference to AliFMDDensityCalculator object 
   */
  virtual const AliFMDDensityCalculator& GetDensityCalculator() const = 0;
  /**
   * Get reference to the Corrections algorithm 
   * 
   * @return Reference to AliFMDCorrections object 
   */
  virtual const AliFMDCorrections& GetCorrections() const = 0;
  /**
   * Get reference to the HistCollector algorithm 
   * 
   * @return Reference to AliFMDHistCollector object 
   */
  virtual const AliFMDHistCollector& GetHistCollector() const = 0;
  /** 
   * @} 
   */
  virtual void SetDebug(Int_t dbg) = 0;
protected: 
  /** 
   * Constructor 
   * 
   * @param name Name of task 
   */
  AliForwardMultiplicityBase(const char* name) 
    : AliAnalysisTaskSE(name), 
      fEnableLowFlux(true), 
      fFirstEvent(true)
  {}
  /** 
   * Constructor
   */
  AliForwardMultiplicityBase() : AliAnalysisTaskSE(), 
      fEnableLowFlux(true), 
      fFirstEvent(true)
  {}
  /** 
   * Copy constructor 
   * 
   * @param o Object to copy from 
   */
  AliForwardMultiplicityBase(const AliForwardMultiplicityBase& o)
    : AliAnalysisTaskSE(o),
      fEnableLowFlux(o.fEnableLowFlux), 
      fFirstEvent(o.fFirstEvent)
  {}
  /** 
   * Assignment operator 
   * 
   * @param o Object to assign from 
   * 
   * @return Reference to this object 
   */
  AliForwardMultiplicityBase& operator=(const AliForwardMultiplicityBase& o)
  {
    fEnableLowFlux = o.fEnableLowFlux;
    fFirstEvent    = o.fFirstEvent;
    return *this;
  }
  /** 
   * Check if all needed corrections are there and accounted for.  If not,
   * do a Fatal exit 
   * 
   * @param what Which corrections is needed
   * 
   * @return true if all present, false otherwise
   */  
  Bool_t CheckCorrections(UInt_t what) const;
  /** 
   * Mark this event as one to store in the AOD 
   * 
   */
  virtual void MarkEventForStore() const;

  Bool_t                 fEnableLowFlux;// Whether to use low-flux specific code
  Bool_t                 fFirstEvent;   // Whether the event is the first seen 

  ClassDef(AliForwardMultiplicityBase,1) // Forward multiplicity class
};

#endif
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