// @(#)root/roostats:$Id$
// Author: Kyle Cranmer, Lorenzo Moneta, Gregory Schott, Wouter Verkerke
/*************************************************************************
 * Copyright (C) 1995-2008, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

/*****************************************************************************
 * Project: RooStats
 * Package: RooFit/RooStats  
 * @(#)root/roofit/roostats:$Id$
 * Original Author: Kyle Cranmer
 *   Kyle Cranmer, Lorenzo Moneta, Gregory Schott, Wouter Verkerke
 *
 *****************************************************************************/



//_________________________________________________________
//
// BEGIN_HTML
// PointSetInterval is a concrete implementation of the ConfInterval interface.  
// It implements simple general purpose interval of arbitrary dimensions and shape.
// It does not assume the interval is connected.
// It uses either a RooDataSet (eg. a list of parameter points in the interval) or
// a RooDataHist (eg. a Histogram-like object for small regions of the parameter space) to
// store the interval.  
// END_HTML
//
//

#ifndef RooStats_PointSetInterval
#include "RooStats/PointSetInterval.h"
#endif

#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooDataHist.h"

using namespace std;

ClassImp(RooStats::PointSetInterval) ;

using namespace RooStats;


//____________________________________________________________________
PointSetInterval::PointSetInterval(const char* name) :
   ConfInterval(name), fConfidenceLevel(0.95), fParameterPointsInInterval(0)
{
   // Default constructor
}

//____________________________________________________________________
PointSetInterval::PointSetInterval(const char* name, RooAbsData& data) :
   ConfInterval(name), fConfidenceLevel(0.95), fParameterPointsInInterval(&data)
{
   // Alternate constructor passing the dataset 
}



//____________________________________________________________________
PointSetInterval::~PointSetInterval()
{
   // Destructor

}


//____________________________________________________________________
Bool_t PointSetInterval::IsInInterval(const RooArgSet &parameterPoint) const
{  
   // Method to determine if a parameter point is in the interval

  RooDataSet*  tree = dynamic_cast<RooDataSet*>(  fParameterPointsInInterval );
  RooDataHist* hist = dynamic_cast<RooDataHist*>( fParameterPointsInInterval );
  
  if( !this->CheckParameters(parameterPoint) ){
    //    std::cout << "problem with parameters" << std::endl;
    return false; 
  }
  
  if( hist ) {
    if ( hist->weight( parameterPoint , 0 ) > 0 ) // positive value indicates point is in interval
      return true; 
    else
      return false;
  }
  else if( tree ){
    const RooArgSet* thisPoint = 0;
    // need to check if the parameter point is the same as any point in tree. 
    for(Int_t i = 0; i<tree->numEntries(); ++i){
      // This method is not complete
      thisPoint = tree->get(i); 
      bool samePoint = true;
      TIter it = parameterPoint.createIterator();
      RooRealVar *myarg; 
      while ( samePoint && (myarg = (RooRealVar *)it.Next())) { 
	if(myarg->getVal() != thisPoint->getRealValue(myarg->GetName()))
	  samePoint = false;
      }
      if(samePoint) 
	return true;

      //      delete thisPoint;
    }
    return false; // didn't find a good point
  }
  else {
      std::cout << "dataset is not initialized properly" << std::endl;
  }

   return true;
  
}

//____________________________________________________________________
RooArgSet* PointSetInterval::GetParameters() const
{  
   // returns list of parameters
   return new RooArgSet(*(fParameterPointsInInterval->get()) );
}

//____________________________________________________________________
Bool_t PointSetInterval::CheckParameters(const RooArgSet &parameterPoint) const
{  
   if (parameterPoint.getSize() != fParameterPointsInInterval->get()->getSize() ) {
     std::cout << "PointSetInterval: argument size is wrong, parameters don't match: arg=" << parameterPoint
	       << " interval=" << (*fParameterPointsInInterval->get()) << std::endl;
      return false;
   }
   if ( ! parameterPoint.equals( *(fParameterPointsInInterval->get() ) ) ) {
      std::cout << "PointSetInterval: size is ok, but parameters don't match" << std::endl;
      return false;
   }
   return true;
}


//____________________________________________________________________
Double_t PointSetInterval::UpperLimit(RooRealVar& param ) 
{  
  RooDataSet*  tree = dynamic_cast<RooDataSet*>(  fParameterPointsInInterval );
  Double_t low = 0, high = 0;
  if( tree ){
    tree->getRange(param, low, high);
    return high;
 }
  return param.getMax();
}

//____________________________________________________________________
Double_t PointSetInterval::LowerLimit(RooRealVar& param ) 
{  
  RooDataSet*  tree = dynamic_cast<RooDataSet*>(  fParameterPointsInInterval );
  Double_t low = 0, high = 0;
  if( tree ){
    tree->getRange(param, low, high);
    return low;
 }
  return param.getMin();
}