// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_histo_c1d
#define tools_histo_c1d

#include "base_cloud"

#include "../mnmx"

#include "h1d"

namespace tools {
namespace histo {

class c1d : public base_cloud {
public:
  static const std::string& s_class() {
    static const std::string s_v("tools::histo::c1d");
    return s_v;
  }
public:
  bool set_title(const std::string& a_title){
    m_title = a_title;
    if(m_histo) m_histo->set_title(a_title);
    return true;
  }

  unsigned int dimension() const {return 1;}
  bool reset() {
    clear();
    delete m_histo;
    m_histo = 0;
    return true;
  }
  unsigned int entries() const {
    return m_histo ? m_histo->all_entries() : (unsigned int)m_ws.size();
  }
public:
  double sum_of_weights() const {
    return (m_histo ? m_histo->sum_bin_heights() : m_Sw);
  }

  bool convert_to_histogram(){
    if( (m_cnv_x_num<=0) || (m_cnv_x_max<=m_cnv_x_min) ) {
      // Cloud min, max should be included in the histo.
      double dx = 0.01 * (upper_edge() - lower_edge())/BINS();
      return convert(BINS(),lower_edge(),upper_edge() + dx);
    } else {
      return convert(m_cnv_x_num,m_cnv_x_min,m_cnv_x_max);
    }
  }

  bool is_converted() const {return m_histo ? true : false;}
  bool scale(double a_scale) {
    if(m_histo) {
      return m_histo->scale(a_scale);
    } else {
      size_t number = m_ws.size();
      for(size_t index=0;index<number;index++) m_ws[index] *= a_scale;
      m_Sw *= a_scale;
      m_Sxw *= a_scale;
      m_Sx2w *= a_scale;
      return true;
    }
  }

  bool set_histogram(h1d* a_histo){ //we take ownership of a_histo.
    reset();
    m_histo = a_histo;
    return true;
  }

public:
  bool fill(double aX,double aW = 1){
    if(!m_histo && (m_limit!=UNLIMITED()) &&
       ((int)m_xs.size()>=m_limit)){
      convert_to_histogram();
    }

    if(m_histo) {
      return m_histo->fill(aX,aW);
    } else {
      if(m_xs.size()) {
        m_lower_x = min_of<double>(aX,m_lower_x);
        m_upper_x = max_of<double>(aX,m_upper_x);
      } else {
        m_lower_x = aX;
        m_upper_x = aX;
      }
      m_xs.push_back(aX);
      m_ws.push_back(aW);
      m_Sw += aW;
      double xw = aX * aW;
      m_Sxw += xw;
      m_Sx2w += aX * xw;
      return true;
    }
  }

  double lower_edge() const {
    return (m_histo ? m_histo->axis().lower_edge() : m_lower_x);
  }
  double upper_edge() const {
    return (m_histo ? m_histo->axis().upper_edge() : m_upper_x);
  }
  double value(unsigned int a_index) const {return (m_histo ?0:m_xs[a_index]);}
  double weight(unsigned int a_index) const {return (m_histo ?0:m_ws[a_index]);}
  double mean() const {
    return (m_histo ? m_histo->mean() : (m_Sw?m_Sxw/m_Sw:0));
  }
  double rms() const {
    double _rms = 0; //FIXME nan.
    if(m_histo) {
      _rms = m_histo->rms();
    } else {
      if(m_Sw==0) {
      } else {
        double _mean = m_Sxw / m_Sw;
        _rms = ::sqrt(::fabs( (m_Sx2w / m_Sw) - _mean * _mean));
      }
    }
    return _rms;
  }

  bool convert(unsigned int a_bins,double a_lower_edge,double a_upper_edge){
    if(m_histo) return true;
    m_histo = new histo::h1d(base_cloud::title(),a_bins,a_lower_edge,a_upper_edge);
    if(!m_histo) return false;
    bool status = fill_histogram(*m_histo);
    clear();
    return status;
  }

  bool convert(const std::vector<double>& a_edges) {
    if(m_histo) return true;
    m_histo = new histo::h1d(base_cloud::title(),a_edges);
    if(!m_histo) return false;
    bool status = fill_histogram(*m_histo);
    clear();
    return status;
  }

  const histo::h1d& histogram() const {
    if(!m_histo) const_cast<c1d&>(*this).convert_to_histogram();
    return *m_histo;
  }
  template <class HISTO>
  bool fill_histogram(HISTO& a_histo) const {
    size_t number = m_xs.size();
    for(size_t index=0;index<number;index++) {
      if(!a_histo.fill(m_xs[index],m_ws[index])) return false;
    }
    return true;
  }
  bool set_conversion_parameters(unsigned int aCnvXnumber,
                                 double aCnvXmin,double aCnvXmax){
    m_cnv_x_num = aCnvXnumber;
    m_cnv_x_min = aCnvXmin;
    m_cnv_x_max = aCnvXmax;
    return true;
  }

public:
  c1d()
  :base_cloud(UNLIMITED())
  ,m_lower_x(0),m_upper_x(0)
  ,m_Sxw(0),m_Sx2w(0)
  ,m_cnv_x_num(0),m_cnv_x_min(0),m_cnv_x_max(0),m_histo(0)
  {}

  c1d(const std::string& a_title,int aLimit = base_cloud::UNLIMITED())
  :base_cloud(aLimit)
  ,m_lower_x(0),m_upper_x(0)
  ,m_Sxw(0),m_Sx2w(0)
  ,m_cnv_x_num(0),m_cnv_x_min(0),m_cnv_x_max(0),m_histo(0)
  {
    set_title(a_title);
  }

  virtual ~c1d(){delete m_histo;}
public:
  c1d(const c1d& a_from)
  :base_cloud(a_from)
  ,m_xs(a_from.m_xs)
  ,m_lower_x(a_from.m_lower_x)
  ,m_upper_x(a_from.m_upper_x)
  ,m_Sxw(a_from.m_Sxw)
  ,m_Sx2w(a_from.m_Sx2w)
  ,m_cnv_x_num(a_from.m_cnv_x_num)
  ,m_cnv_x_min(a_from.m_cnv_x_min)
  ,m_cnv_x_max(a_from.m_cnv_x_max)
  ,m_histo(0)
  {
    if(a_from.m_histo) {
      m_histo = new histo::h1d(*a_from.m_histo);
    }
  }

  c1d& operator=(const c1d& a_from){
    base_cloud::operator=(a_from);
    if(&a_from==this) return *this;
    m_xs = a_from.m_xs;
    m_lower_x = a_from.m_lower_x;
    m_upper_x = a_from.m_upper_x;
    m_Sxw = a_from.m_Sxw;
    m_Sx2w = a_from.m_Sx2w;
    m_cnv_x_num = a_from.m_cnv_x_num;
    m_cnv_x_min = a_from.m_cnv_x_min;
    m_cnv_x_max = a_from.m_cnv_x_max;
    delete m_histo;
    m_histo = 0;
    if(a_from.m_histo) {
      m_histo = new histo::h1d(*a_from.m_histo);
    }
    return *this;
  }

public: //AIDA API
  double lowerEdge() const {return lower_edge();}
  double upperEdge() const {return upper_edge();}
  template <class HISTO>
  bool fillHistogram(HISTO& a_histo) const {return fill_histogram<HISTO>(a_histo);}
protected:
  void clear(){
    m_lower_x = 0;
    m_upper_x = 0;
    m_Sw = 0;
    m_Sxw = 0;
    m_Sx2w = 0;
    m_xs.clear();
    m_ws.clear();
  }

protected:
  std::vector<double> m_xs;
  double m_lower_x;
  double m_upper_x;
  double m_Sxw;
  double m_Sx2w;
  //
  unsigned int m_cnv_x_num;
  double m_cnv_x_min;
  double m_cnv_x_max;
  histo::h1d* m_histo;
};

}}

#endif
