/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Geometry/TrackerNumberingBuilder/plugins/CmsTrackerLevelBuilder.h

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#ifndef Geometry_TrackerNumberingBuilder_CmsTrackerLevelBuilder_H
#define Geometry_TrackerNumberingBuilder_CmsTrackerLevelBuilder_H 

#include "Geometry/TrackerNumberingBuilder/plugins/CmsTrackerAbstractConstruction.h"
#include "Geometry/TrackerNumberingBuilder/interface/CmsTrackerStringToEnum.h"
#include "Geometry/TrackerNumberingBuilder/interface/GeometricDet.h"
#include "FWCore/ParameterSet/interface/types.h"
#include <string>
typedef std::unary_function<const GeometricDet*, double> uFcn;

class CmsTrackerLevelBuilder : public CmsTrackerAbstractConstruction {
public:
  virtual void build(DDFilteredView& , GeometricDet*, std::string);
  virtual ~CmsTrackerLevelBuilder(){}
  
  
  struct subDetByType{
    bool operator()(const GeometricDet* a, const GeometricDet* b) const {
      return a->type() < b->type();
    }
  };
  
  struct LessZ{
    bool operator()(const GeometricDet* a, const GeometricDet* b) const
    {
      return a->translation().z() < b->translation().z();   
    }
  };
  
  struct LessModZ{
    bool operator()(const GeometricDet* a, const GeometricDet* b) const
    {
      return fabs(a->translation().z()) < fabs(b->translation().z());   
    }
  };
  
  
  struct ExtractPhi:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      double phi = a->phi();
      return( phi>= 0 ? phi:phi+2*pi);   
    }
  };
  
  struct ExtractPhiModule:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      std::vector<const GeometricDet*> const & comp = a->components().back()->components();
      float phi = 0.;
      bool sum = true;
      
      for(unsigned int i=0;i<comp.size();i++){
        if(fabs(comp[i]->phi())>pi/2.) { 
          sum = false;
          break;
        }
      }
      
      if(sum){
        for(unsigned int i=0;i<comp.size();i++){
          phi+= comp[i]->phi();
        }
        
        double temp = phi/float(comp.size()) < 0. ? 
          2*pi + phi/float(comp.size()):
          phi/float(comp.size());
        return temp;
        
      }else{
        for(unsigned int i=0;i<comp.size();i++){
          double phi1 = comp[i]->phi() >= 0 ? comp[i]->phi(): 
            comp[i]->phi()+2*pi; 
          phi+= phi1;
        }
        
        double com = comp.front()->phi() >= 0 ? comp.front()->phi():
          2*pi + comp.front()->phi();
        double temp = fabs(phi/float(comp.size()) - com) > 2. ? 
          pi - phi/float(comp.size()):
          phi/float(comp.size());
        temp = temp >= 0? temp:2*pi+temp;
        return temp;
      }
    }
  };
  
  struct ExtractPhiGluedModule:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      std::vector<const GeometricDet*> comp;
      a->deepComponents(comp);
      float phi = 0.;
      bool sum = true;
      
      for(unsigned int i=0;i<comp.size();i++){
        if(fabs(comp[i]->phi())>pi/2.) {
          sum = false;
          break;
        }
      }
      
      if(sum){
        for(unsigned int i=0;i<comp.size();i++){
          phi+= comp[i]->phi();
        }
        
        double temp = phi/float(comp.size()) < 0. ? 
          2*pi + phi/float(comp.size()):
          phi/float(comp.size());
        return temp;
        
      }else{
        for(unsigned int i=0;i<comp.size();i++){
          double phi1 = comp[i]->phi() >= 0 ? comp[i]->phi(): 
            comp[i]->translation().phi()+2*pi; 
          phi+= phi1;
        }
        
        double com = comp.front()->phi() >= 0 ? comp.front()->phi():
          2*pi + comp.front()->phi();
        double temp = fabs(phi/float(comp.size()) - com) > 2. ? 
          pi - phi/float(comp.size()):
          phi/float(comp.size());
        temp = temp >= 0? temp:2*pi+temp;
        return temp;
      }
    }
  };
  
  struct ExtractPhiMirror:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      double phi = a->phi();
      phi = (phi>= 0 ? phi : phi+2*pi); // (-pi,pi] --> [0,2pi)
      return ( (pi-phi) >= 0 ? (pi-phi) : (pi-phi)+2*pi ); // (-pi,pi] --> [0,2pi)
    }
  };
  
  struct ExtractPhiModuleMirror:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      double phi = ExtractPhiModule()(a); // [0,2pi)
      phi = ( phi <= pi ? phi : phi-2*pi );   // (-pi,pi]   
      return (pi-phi);
    }
  };
  
  struct ExtractPhiGluedModuleMirror:public uFcn{
    double operator()(const GeometricDet* a)const{
      const double pi = 3.141592653592;
      double phi = ExtractPhiGluedModule()(a); // [0,2pi)
      phi = ( phi <= pi ? phi : phi-2*pi );   // (-pi,pi]   
      return (pi-phi);
    }
  };
  
  struct LessR_module{
    bool operator()(const GeometricDet* a, const GeometricDet* b) const
    {
      return a->deepComponents().front()->rho() < 
        b->deepComponents().front()->rho();      
    }
  };
  
  struct LessR{
    bool operator()(const GeometricDet* a, const GeometricDet* b) const
    {
      return a->rho() < b->rho(); 
    }
  };
  
  
 private:
  virtual void buildComponent(DDFilteredView& , GeometricDet*, std::string) = 0;
protected:
  CmsTrackerStringToEnum theCmsTrackerStringToEnum;
private:
  virtual void sortNS(DDFilteredView& , GeometricDet*){}
  CmsTrackerStringToEnum _CmsTrackerStringToEnum;
};

#endif