#include <string>
#include <iostream>
#include <iomanip>
#include <vector>

#include "TROOT.h"
#include "TFile.h"
#include "TKey.h"
#include "TH3.h"
#include "TString.h"
#include "TRegexp.h"

#include "JGizmo/JRootObjectID.hh"
#include "JGizmo/JGizmoToolkit.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


/**
 * \file
 * Auxiliary program to convert 3D histograms to PDFs.
 * The option <tt>-f</tt> corresponds to <tt>\<file name\>:\<object name\></tt>.
 *
 * Possible operations (option <tt>-O \<operation\></tt>:
 *     - NXYZ\n
 *       make 3D PDF;
 *     - NXY\n
 *       make 2D PDF along x- and y-axis;
 *     - NXZ\n
 *       make 2D PDF along x- and z-axis;
 *     - NYZ\n
 *       make 2D PDF along y- and z-axis;
 *     - NX\n
 *       make PDF along x-axis;
 *     - NY\n
 *       make PDF along y-axis;
 *     - NZ\n
 *       make PDF along z-axis;
 *     - WXYZ\n
 *       divide bin contents by width of x-, y- and z-bin;
 *     - WXY\n
 *       divide bin contents by width of x- and y-bin;
 *     - WXZ\n
 *       divide bin contents by width of x- and z-bin;
 *     - WYZ\n
 *       divide bin contents by width of y- and z-bin;
 *     - WX\n
 *       divide bin contents by width of x-bin;
 *     - WY\n
 *       divide bin contents by width of y-bin;
 *     - WZ\n
 *       divide bin contents by width of z-bin;
 *     - E\n
 *       apply operation also to bin errors;
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;
  
  vector<JRootObjectID> inputFile;
  string                outputFile;
  string                option;
  int                   debug;

  try {

    JParser<> zap("Auxiliary program to convert 2D histograms to PDFs.");

    zap['f'] = make_field(inputFile,  "<input file>:<object name>");
    zap['O'] = make_field(option);
    zap['o'] = make_field(outputFile, "ROOT file with histogram(s)") = "pdf.root";
    zap['d'] = make_field(debug)      = 1;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  vector<TH3*> listOfObjects;

  for (vector<JRootObjectID>::const_iterator input = inputFile.begin(); input != inputFile.end(); ++input) {

    DEBUG("Input: " << *input << endl);

    TDirectory* dir = getDirectory(*input);

    if (dir == NULL) {
      ERROR("File: " << input->getFullFilename() << " not opened." << endl);
      continue;
    }

    const TRegexp regexp(input->getObjectName());

    TIter iter(dir->GetListOfKeys());

    for (TKey* key; (key = (TKey*) iter.Next()) != NULL; ) {

      const TString tag(key->GetName());

      DEBUG("Key: " << tag << " match = " << tag.Contains(regexp) << endl);

      // option match

      if (tag.Contains(regexp) && isTObject(key)) {

	TObject* object = key->ReadObj();
	
	TH3*  h3 = dynamic_cast<TH3*>(object);
	
	if (h3 != NULL) {
	  listOfObjects.push_back(h3);
	} else {
	  ERROR("Incompatible object " << object->GetName() << endl);
	}
      }
    }
  }

  TFile out(outputFile.c_str(), "recreate");

  for (vector<TH3*>::iterator h3 = listOfObjects.begin(); h3 != listOfObjects.end(); ++h3) {

    convertToPDF(**h3, option);
    
    (*h3)->Write();
  }
  
  out.Write();
  out.Close();
}