/*
 * RigFillAction.h
 *
 *  Created on: 14/lug/2009
 *      Author: Nicola Mori
 */

/*! @file RigFillAction.h The RigFillAction class declaration file */

#ifndef RIGFILLACTION_H_
#define RIGFILLACTION_H_

#include "../CollectionAction/CollectionAction.h"
#include <TH2I.h>
#include <stdint.h>

/*! @brief The rigidity vs threshold rigidity histogram filling.
 *
 * This class builds a 2D histogram binned in rigidity modulus
 * and threshold rigidity. Each 2D bin will contain the number of events whose
 * rigidity modulus and threshold rigidity (eg., Stoermer cutoff rigidity times a threshold coefficient)
 * lie in that bin. Note that the meaning of this threshold coefficient is the same as in
 * TrkRigGeoCut, so it must have the same value used for TrkRigGeoCut (consider
 * using TrkRigGeoCut::GetThresholdCoeff() to retrieve its value).
 * Events are discarded only if their rigidity modulus or cutoff rigidity lies
 * outside the histogram bounds.
 *
 * CUT DEPENDECIES: TrkPhSinCut for single physical track, TrkRigGeoCut for galactic event.
 *
 */
class RigFillAction: public CollectionAction {

public:
  /*! @brief Constructor.
   *
   * outFileBase is the base name for output file: #Finalize will add .txt for ASCII output
   * and .root for ROOT output. outFileBase has to contain the path (otherwise, files will be
   * saved in the current directory).
   * The file containing the rigidity bins must be a text file. It must contain both the
   * lower and upper limits of the rigidity axis, so that if it contains N values it
   * defines a set of N-1 bins.
   *
   * @param actionName The action's name.
   * @param outFileBase The output file base name.
   * @param rigBinsFile The file containing the rigidity bins.
   * @param thresholdCoeff The threshold coefficient for critical rigidity.
   */
  RigFillAction(const char *actionName, TString outFileBase, TString rigBinsFile, float thresholdCoeff);

  /*! @brief Destructor */
  ~RigFillAction() {
  }

  /*! @brief Fills histogram with the selected event.
   *
   * The current event will be added to the bin corresponding to its rigidity and critical rigidity multiplied
   * by the threshold coefficient, eg., to the bin (Rc*threshold, R).
   *
   * @param event The selected event.
   */
  void OnGood(PamLevel2 *event);

  /*! @brief Writes the histogram to the output files (ASCII and ROOT).
   *
   * The output consists of a text file and of a ROOT file where the 2-dimensional histogram (TH2F) is
   * saved. The first row of the text file is the lowest rigidity bin, the second is the next bin and so on, so
   * in the text output the positive direction of the rigidity axis (Y axis) is downwards.
   */
  void Finalize();

  /*! @brief Returns the histogram.
   *
   * This method returns a SimpleMatrix. Its [i][j] element contain the number of analyzed events
   * whose rigidity modulus falls in the i-th rigidity bin and whose threshold rigidity multiplied by the
   * threshold falls in the j-th rigidity bin.
   *
   * @return The rigidity modulus - threshold rigidity 2D histogram.
   */
  SimpleMatrix<UInt_t> &GetHisto() {
    return _textHisto;
  }

private:

  TString _outFileBase;
  vector<float> _bins;
  TH2I _rootHisto;
  SimpleMatrix<UInt_t> _textHisto;
  float _thresholdCoeff;

};
#endif /* RIGFILLACTION_H_ */