/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/MagneticField/GeomBuilder/src/bRod.cc

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// #include "Utilities/Configuration/interface/Architecture.h"

/*
 *  See header file for a description of this class.
 *
 *  $Date: 2008/04/23 13:59:30 $
 *  $Revision: 1.6 $
 *  \author N. Amapane - INFN Torino
 */

#include "MagneticField/GeomBuilder/src/bRod.h"
#include "Utilities/BinningTools/interface/ClusterizingHistogram.h"
#include "MagneticField/Layers/interface/MagBRod.h"
#include "MagneticField/Layers/interface/MagVerbosity.h"
#include "Utilities/General/interface/precomputed_value_sort.h"

using namespace SurfaceOrientation;

MagGeoBuilderFromDDD::bRod::~bRod(){}

//The ctor is in charge of finding slabs inside the rod.
MagGeoBuilderFromDDD::bRod::bRod(handles::const_iterator begin,
                                        handles::const_iterator end) :
  volumes(begin,end),
  mrod(0)
{
  precomputed_value_sort(volumes.begin(), volumes.end(), ExtractZ());

  // Clusterize in Z
  const float resolution = 5.; // cm
  float zmin = volumes.front()->center().z()-resolution;
  float zmax = volumes.back()->center().z()+resolution;
  ClusterizingHistogram  hisZ( int((zmax-zmin)/resolution) + 1, zmin, zmax);

  if (MagGeoBuilderFromDDD::debug) std::cout << "     Z slabs: " << zmin << " " << zmax << std::endl;

  handles::const_iterator first = volumes.begin();
  handles::const_iterator last = volumes.end();  

  for (handles::const_iterator i=first; i!=last; ++i){
    hisZ.fill((*i)->center().z());
  }
  std::vector<float> zClust = hisZ.clusterize(resolution);

  if (MagGeoBuilderFromDDD::debug) std::cout << "     Found " << zClust.size() << " clusters in Z, "
                  << " slabs: " << std::endl;

  handles::const_iterator slabStart = first;
  handles::const_iterator separ = first;

  for (unsigned int i=0; i<zClust.size() - 1; ++i) {
    float zSepar = (zClust[i] + zClust[i+1])/2.f;
    while ((*separ)->center().z() < zSepar) ++separ;
    if (MagGeoBuilderFromDDD::debug) {
      std::cout << "     Slab at: " << zClust[i]
           << " elements: " << separ-slabStart << " unique volumes: ";
      volumeHandle::printUniqueNames(slabStart, separ);
    }
    
    slabs.push_back(bSlab(slabStart, separ));
    slabStart = separ;
  }
  {
    if (MagGeoBuilderFromDDD::debug) {
      std::cout << "     Slab at: " << zClust.back() <<" elements: " << last-separ
           << " unique volumes: ";
      volumeHandle::printUniqueNames(separ,last);
    }
    slabs.push_back(bSlab(separ, last));
  }

  // Check that all slabs have the same dphi.
  std::vector<bSlab>::const_iterator i = slabs.begin();
  Geom::Phi<float> phimax = (*i).maxPhi();
  Geom::Phi<float> phimin = (*i).minPhi();
  for (++i; i!= slabs.end(); ++i) { 
    if(fabs(phimax - (*i).maxPhi()) > 0.001 ||
       fabs(phimin - (*i).minPhi()) > 0.001){
      if (MagGeoBuilderFromDDD::debug) std::cout << "*** WARNING: slabs in this rod have different dphi!" <<std::endl;
    }
  }
}



MagBRod* MagGeoBuilderFromDDD::bRod::buildMagBRod() const{
  if (mrod==0) {
    std::vector<MagBSlab*> mSlabs;
    for (std::vector<bSlab>::const_iterator slab = slabs.begin();
         slab!=slabs.end(); ++slab) {
      mSlabs.push_back((*slab).buildMagBSlab());
    }
    mrod = new MagBRod(mSlabs,slabs.front().minPhi()); //FIXME
  }
  return mrod;
}