#include <string>
#include <iostream>
#include <iomanip>
#include <vector>
#include <set>
#include <map>
#include <algorithm>

#include "TROOT.h"
#include "TFile.h"
#include "TH1D.h"
#include "TH2D.h"

#include "km3net-dataformat/offline/Head.hh"
#include "km3net-dataformat/offline/Evt.hh"
#include "km3net-dataformat/online/JDAQ.hh"
#include "km3net-dataformat/online/JDAQPMTIdentifier.hh"
#include "km3net-dataformat/online/JDAQSummaryFrame.hh"

#include "JDAQ/JDAQEventIO.hh"
#include "JDAQ/JDAQSummarysliceIO.hh"

#include "JDetector/JDetector.hh"
#include "JDetector/JDetectorToolkit.hh"
#include "JDetector/JModuleRouter.hh"
#include "JDetector/JPMTRouter.hh"

#include "JTrigger/JHitL0.hh"
#include "JTrigger/JBuildL0.hh"
#include "JTrigger/JTriggerToolkit.hh"

#include "JSupport/JSupport.hh"
#include "JSupport/JTriggeredFileScanner.hh"
#include "JSupport/JSummaryFileRouter.hh"
#include "JSupport/JMonteCarloFileSupportkit.hh"
#include "JAAnet/JAAnetToolkit.hh"

#include "JFit/JLine1Z.hh"
#include "JFit/JNPEHit.hh"
#include "JFit/JModel.hh"

#include "JPhysics/KM3NeT.hh"
#include "JPhysics/JGeane.hh"

#include "JReconstruction/JHitW0.hh"
#include "JReconstruction/JEvt.hh"
#include "JReconstruction/JEvtToolkit.hh"
#include "JReconstruction/JMuonStartParameters_t.hh"
#include "JReconstruction/JStart.hh"

#include "JROOT/JManager.hh"
#include "JTools/JAbstractHistogram.hh"

#include "JLang/JPredicate.hh"
#include "JLang/JComparator.hh"

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

namespace {

  using namespace JPP;
  using namespace KM3NETDAQ;

  /**
   * Get probability of given response in optical module due to random background.
   *
   * \param  module               module
   * \param  frame                summary frame
   * \param  R_Hz                 multiples rates [Hz]
   * \param  T_ns                 time window [ns]
   * \param  top                  list of indentifiers of PMTs with hit in given module
   * \return                      probability
   */
  inline double getProbability(const JModule&            module,
			       const JDAQSummaryFrame&   frame,
			       const JRateL1_t&          R_Hz,
			       const double              T_ns,
			       const std::multiset<int>& top)
  {
    using namespace std;
    using namespace JPP;
    using namespace KM3NETDAQ;

    size_t N = 0;         // number of active PMTs
    size_t M = 0;         // multiplicity
    double R = 0.0;       // total rate

    for (size_t i = 0; i != module.size(); ++i) {

      if (getDAQStatus(frame, module, i)            &&
	  getPMTStatus(frame, module, i)            &&
	  !module.getPMT(i).has(PMT_DISABLE)) {

	N += 1;
	M += top.count(i);
	R += frame.getRate(i);
      }
    }

    if (N > 0) 
      return JFIT::getProbability(N, M, JK40Rates(R/N, R_Hz), T_ns);
    else
      return (M == 0 ? 1.0 : 0.0);
  }
}


/**
 * \file
 *
 * Program to test JMuonStart.cc.
 *
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;
  using namespace KM3NETDAQ;
  
  typedef JTriggeredFileScanner<JEvt, JSingleFileScanner>   JTriggeredFileScanner_t;
  typedef JTriggeredFileScanner_t::multi_pointer_type       multi_pointer_type;

  typedef JAbstractHistogram<double> JHistogram_t;

  JTriggeredFileScanner_t  inputFile;
  JLimit_t&                numberOfEvents = inputFile.getLimit();
  string                   detectorFile;
  string                   outputFile;
  JMuonStartParameters_t   parameters;
  JK40Rates                rates_Hz;
  JHistogram_t             histogram;
  int                      debug;

  try { 

    parameters.numberOfPrefits = 1;

    JParser<> zap("Program to test JMuonStart.");
    
    zap['f'] = make_field(inputFile,    "input file (output of JXXXMuonReconstruction.sh)");
    zap['a'] = make_field(detectorFile);
    zap['n'] = make_field(numberOfEvents)      = JLimit::max();
    zap['o'] = make_field(outputFile)          = "start.root";
    zap['@'] = make_field(parameters)          = JPARSER::initialised();
    zap['B'] = make_field(rates_Hz)            = KM3NET::getK40Rates();
    zap['H'] = make_field(histogram,    "histogram binning")          = JHistogram_t(200, -250.0, +250.0);
    zap['d'] = make_field(debug)               = 1;
    
    zap(argc, argv);
  }
  catch(const exception& error) {
    FATAL(error.what() << endl);
  }


  JDetector detector;

  try {
    load(detectorFile, detector);
  }
  catch(const JException& error) {
    FATAL(error);
  }

  const JModuleRouter moduleRouter(detector);
  const JPMTRouter    pmtRouter   (detector);
  
  JSummaryFileRouter  summary(inputFile, parameters.R_Hz);

  const JTimeRange T_ns (parameters.TMin_ns, parameters.TMax_ns);
  const JStart     start(parameters.Pmin1, parameters.Pmin2, parameters.Nmax2);

  typedef JHitL0            hit_type;

  typedef vector<hit_type>  buffer_type;
  const JBuildL0<hit_type>  buildL0;


  JHead head;

  try {
    head = getHeader(inputFile);
  }
  catch(const JException& error) {
    FATAL(error);
  }

  const JPosition3D center = get<JPosition3D>(head);

  NOTICE("center: " << center << endl);

  JManager<string, TH1D> H1(new TH1D("[%].1L", NULL, 
				     histogram.getNumberOfBins(), histogram.getLowerLimit(), histogram.getUpperLimit()));
  JManager<string, TH2D> H2(new TH2D("[%].2D", NULL, 
				     histogram.getNumberOfBins(), histogram.getLowerLimit(), histogram.getUpperLimit(),
				     histogram.getNumberOfBins(), histogram.getLowerLimit(), histogram.getUpperLimit()));

  while (inputFile.hasNext()) {

    STATUS("event: " << setw(10) << inputFile.getCounter() << '\r'); DEBUG(endl);

    multi_pointer_type ps = inputFile.next();

    JDAQEvent* tev   = ps;
    JEvt*      evt   = ps;
    Evt*       event = ps;

    summary.update(*tev);

    vector<Trk>::iterator muon = event->mc_trks.end();

    for (vector<Trk>::iterator track = event->mc_trks.begin(); track != event->mc_trks.end(); ++track) {

      if (is_muon(*track)) {
	if (muon == event->mc_trks.end() || track->E > muon->E) {
	  muon = track;
	}
      }
    }

    if (muon == event->mc_trks.end()) {
      continue;
    }

    if (muon->len == 0.0) {
      muon->len = gWater(muon->E);
    }


    typedef JRange<double> JRange_t;

    JRange_t za(JRange_t::DEFAULT_RANGE);   // Monte Carlo
    JRange_t zb(JRange_t::DEFAULT_RANGE);   // original result
    JRange_t zd(JRange_t::DEFAULT_RANGE);   // new

    {
      const JRotation3D R(getDirection(*muon));

      JTrack3D ta = getTrack(*muon);

      ta.add(center);
      ta.rotate(R);

      za.setLowerLimit(ta.getZ());
      za.setLength(fabs(muon->len));
    }


    buffer_type dataL0;

    buildL0(*tev, moduleRouter, true, back_inserter(dataL0));


    if (!evt->empty()) {

      sort(evt->begin(), evt->end(), qualitySorter);

      JEvt::const_iterator track = evt->begin();

      const JRotation3D           R (getDirection(*track));
      const JLine1Z               tz(getPosition (*track).rotate(R), track->getT());
      const JFIT::JModel<JLine1Z> match(tz, parameters.roadWidth_m, T_ns);

      if (track->has(JMUONSTART)) {
	if (track->hasW(JSTART_LENGTH_METRES) && track->getW(JSTART_LENGTH_METRES) > 0.0) {
	  zb = JRange_t(tz.getZ(), tz.getZ() + track->getW(JSTART_LENGTH_METRES));
	}
      }

      {
	map<int, multiset<int> > top;

	for (buffer_type::const_iterator i = dataL0.begin(); i != dataL0.end(); ++i) {

	  hit_type hit(*i);

	  hit.rotate(R);

	  if (match(hit)) {
	    top[hit.getModuleID()].insert(hit.getPMTAddress());
	  }
	}

	struct JHit_t {

	  double getZ() const { return z; }
	  double getP() const { return p; }

	  double z;
	  double p;
	};

	vector<JHit_t> data;

	for (JDetector::const_iterator module = detector.begin(); module != detector.end(); ++module) {

	  if (summary.hasSummaryFrame(module->getID())) {

	    const JDAQSummaryFrame& frame = summary.getSummaryFrame(module->getID());

	    JPosition3D pos(module->getPosition());

	    pos.transform(R, tz.getPosition());

	    if (pos.getX() <= parameters.roadWidth_m) {

	      const double z = pos.getZ()  -  pos.getX() / getTanThetaC();
	      const double p = getProbability(*module, frame, rates_Hz.getMultiplesRates(), T_ns.getLength(), top[module->getID()]);

	      data.push_back({ z, p });
	    }
	  }
	}

	if (!data.empty()) {

	  sort(data.begin(), data.end(), make_comparator(&JHit_t::getZ));

	  vector<JHit_t>::const_iterator         track_start = start.find(data. begin(), data. end());
	  vector<JHit_t>::const_reverse_iterator track_end   = start.find(data.rbegin(), data.rend());

	  if (track_start == data. end()) { track_start = data. begin(); }
	  if (track_end   == data.rend()) { track_end   = data.rbegin(); }

	  zd = JRange_t(track_start->getZ(), track_end->getZ());

	  zd.add(tz.getZ());
	}
      }
    }

    H1["B"]->Fill(zb.getLength() - za.getLength());
    H1["D"]->Fill(zd.getLength() - za.getLength());

    H2["B"]->Fill(zb.getLowerLimit() - za.getLowerLimit(), zb.getUpperLimit() - za.getUpperLimit());
    H2["D"]->Fill(zd.getLowerLimit() - za.getLowerLimit(), zd.getUpperLimit() - za.getUpperLimit());
  }
  STATUS(endl);


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

  out << H1 << H2;

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