#ifndef __JCOMPAREHISTOGRAMS__JTESTKOLMOGOROV_2D__
#define __JCOMPAREHISTOGRAMS__JTESTKOLMOGOROV_2D__

#include <istream>
#include <ostream>
#include "TMath.h"
#include "JCompareHistograms/JTest_t.hh"
#include "JCompareHistograms/JTestKolmogorov_t.hh"


/**
 * \author rgruiz
 */
namespace JCOMPAREHISTOGRAMS {

  /**
   * Implementation of the Kolmogorov test for 2D histograms.\n
   * This class is derived from the abstract class JTest_t(). For a general description of the implementation of this and other tests derived from JTest_t(), see its documentation.\n
   * This test compares two 2D histograms. If the parameter slice() equals x, X y or Y, the histograms are sliced along the corresponding axis, and the JKolmogorovTest() test is applied to each slice.\n 
   * If slice() equals n or N, the histograms are not sliced, and JKolmogorovTest2D() is applied.\n 
   * The input parameter threshold(), is used to evaluate whether the test is passed or failed for each slice or for the full 2D distribution.\n
   * The evaluation is done by comparing the threshold() value with the result produced by JKolmogorovTest() or JKolmogorovTest2D(), which is a p-value.\n 
   * The parameter threshold() should therefore be a real value between 0 and 1.
   */
  class JTestKolmogorov_2D: 
    public JTest_t,
    public JTestKolmogorov_t
  { 
  public:  
    /**
     * Default constructor.
     */    
    JTestKolmogorov_2D() :
      JTest_t("KS_2D", "p-Value(KS)"),
      JTestKolmogorov_t()
    {}
  
    /**
     * Read test parameters from input.
     *
     * \param  in            input stream
     * \return               input stream
     */
    std::istream& read(std::istream& in) override{ 
      return in >> threshold;
    };
    
    /**
     * Applies Kolmogorov test for two ROOT TH2 histograms.
     *
     * \param o1 First histogram
     * \param o2 Second histogram
     */
    void test(TObject* o1, TObject* o2) override{    
      
      using namespace std;
      using namespace JPP;
    
      if (!(dynamic_cast<TH2*>(o1) == NULL) && !(dynamic_cast<TH2*>(o2) == NULL)) {
	 	  
	TH2D* h1 = dynamic_cast<TH2D*>(o1);
	TH2D* h2 = dynamic_cast<TH2D*>(o2);

	JTestResult r = JKolmogorovTest2D(h1,h2,threshold, testName, resultType);
	results.push_back(r);

      }else if (!(dynamic_cast<TH1*>(o1) == NULL) && !(dynamic_cast<TH1*>(o2) == NULL)) {
	ERROR("For 1D histograms call JTestKolmogorov_1D: " << o1->GetName() << endl);
      }
    };
  
  private:
    double threshold;                            //!< threshold p-value to decide if test is passed.
  };
}
  
#endif