//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Implementation of class TpcDevmapCylLoader
//      See class header for details
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
//      Felix Boehmer        TUM            (original author)
//
//
//-----------------------------------------------------------


//This class' Header ---------------------------------------
#include "TpcDevmapCylLoader.h"

//C++ Headers ----------------------------------------------
#include <fstream>
#include <iostream>

//Collaborating Headers ------------------------------------
#include "TpcDevmapCyl.h"
#include "TError.h"

//Class Member Definitions ---------------------------------

TpcDevmapCylLoader::TpcDevmapCylLoader(TpcDevmapCyl* devmap,
				       const char* const fileName)
{
  _devmap = devmap;
  _fileName = fileName;
  _vDrift = _devmap->vDrift();
}


TpcDevmapCylLoader::~TpcDevmapCylLoader()
{;}

void 
TpcDevmapCylLoader::load()
{
  // try to find and open the file
  std::ifstream infile(_fileName, std::fstream::in);
  if (!infile.good()) 
  {
    Fatal("TpcDevmapCylLoader::load()","devmap-file could not be found.");
    return;
  }
  
  int rSteps, zSteps;
  double rMin, rMax, rWidth, zMin, zMax, zWidth;
 
  infile>>rSteps>>zSteps>>rMin>>rMax>>zMin>>zMax; 
  rWidth = (double)(rMax - rMin)/rSteps;
  zWidth = (double)(zMax - zMin)/zSteps;
  
  _devmap->setNominal(TVector3(0.,0.,0.));
  _devmap->setMinR(rMin);
  _devmap->setSpacingR(rWidth);
  _devmap->setMinZ(zMin);
  _devmap->setSpacingZ(zWidth);
  
  // Initialize the field-map 
  _fieldmap = new std::vector<std::vector<TVector3*>*>;  

  // fill the matrix from the file; z-Index runs first
  for (int nr=0; nr<rSteps; nr++)
  {
    _fieldmap->push_back(new std::vector<TVector3*>(zSteps));
    for (int nz=0; nz<zSteps; nz++)
    {
      double devX, devY, time, dump, devZ, straight_way;
      infile>>devX>>devY>>time>>dump>>dump;
      straight_way = (nz + 0.5) * zWidth;
      devZ = time*_vDrift - straight_way;    //actual z-deviation
      _fieldmap->at(nr)->at(nz) = new TVector3(devX, devY, devZ);      
    }
  }
  std::cout<<"\n\n\nTpcDevmapCylLoader::load(): successfully initialized the Dev-field"
	   <<std::endl;
  
  //just a test
  int lengthr = _fieldmap->size();
  int lengthz = _fieldmap->at(0)->size();
  std::cout << "fieldmap has " << lengthr <<" bins in r and \n"
       << lengthz << " bins in z direction.";
  _devmap->_pGrid = _fieldmap;       //TpcDevmapCyl takes ownership
  infile.close();
}