#include <string>
#include <iostream>
#include <iomanip>
#include <cmath>

#include "TROOT.h"
#include "TFile.h"
#include "TObject.h"
#include "TKey.h"
#include "TH1.h"
#include "TString.h"
#include "TRegexp.h"

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

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

  
/**
 * \file
 *
 * Auxiliary program to make cumulative ROOT histogram.
 * The option <tt>-f</tt> corresponds to <tt>\<file name\>:\<object name\></tt>.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;

  typedef JRange<double>  JRange_t;

  vector<JRootObjectID>   inputFile;
  string                  outputFile;
  JRange_t                X;
  bool                    binwidth;
  bool                    reverse;
  bool                    normalise;
  int                     debug;
 
  try {

    JParser<> zap("Auxiliary program to make cumulative ROOT histogram.");
    
    zap['f'] = make_field(inputFile,  "<input file>:<object name>");
    zap['o'] = make_field(outputFile, "ROOT file with histogram(s)") = "sum.root";
    zap['x'] = make_field(X,          "accepted x-range values")     = JRange_t();
    zap['B'] = make_field(binwidth,   "multiply by bin width");
    zap['R'] = make_field(reverse,    "sum right to left instead of left to right");
    zap['N'] = make_field(normalise,  "normalise histogram contents");
    zap['d'] = make_field(debug)      = 0;
     
    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


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

	try {

	  TH1& h1 = dynamic_cast<TH1&>(*object);

	  double W = 0.0;

	  if (!reverse) {
	    
	    for (Int_t i = 0; i <= h1.GetXaxis()->GetNbins() + 1; ++i) {

	      if (X(h1.GetBinCenter(i))) {
		W += h1.GetBinContent(i) * (binwidth ? h1.GetBinWidth(i) : 1.0);
	      }

	      h1.SetBinContent(i, W);

	      if (h1.GetSumw2N()) {
		h1.SetBinError(i, h1.GetBinError(i) * (binwidth ? h1.GetBinWidth(i) : 1.0));
	      }
	    }

	  } else {
	    
	    for (Int_t i = h1.GetXaxis()->GetNbins() + 1; i >= 0; --i) {

	      if (X(h1.GetBinCenter(i))) {
		W += h1.GetBinContent(i) * (binwidth ? h1.GetBinWidth(i) : 1.0);
	      }

	      h1.SetBinContent(i, W);

	      if (h1.GetSumw2N()) {
		h1.SetBinError(i, h1.GetBinError(i) * (binwidth ? h1.GetBinWidth(i) : 1.0));
	      }
	    }
	  }

	  NOTICE(setw(24) << left << h1.GetName() << ' ' << SCIENTIFIC(12,3) << W << endl);

	  if (normalise && W != 0.0) {
	    h1.Scale(1.0/W);
	  }

	  out.WriteTObject(&h1);
	}
	catch(exception&) {}
      }
    }
  }

  out.Write();
  out.Close();
}