#pragma once
#include "comdefs.h"

using michlib::real;

class BaseData
{
 protected:
 static constexpr real fillval = 1.0e10;
 std::vector<real>     data;

 BaseData() = default;

 BaseData(size_t n): data(n) {}

 public:
 const real& V(size_t i) const { return data[i]; }
 real&       V(size_t i) { return data[i]; }

 const real& operator()(size_t i) const { return data[i]; }
 real&       operator()(size_t i) { return data[i]; }

 size_t N() const { return data.size(); }

 static real Fillval() { return fillval; }

 explicit operator bool() const { return N() != 0; }
};

template<class Data> class Averager: public Data
{
 std::vector<size_t> count;

 public:
 void Add(const Data& d)
 {
  if(!d) return;
  if(!*this)
  {
   *static_cast<Data*>(this) = d;
   count.resize(Data::N());
   for(size_t i = 0; i < Data::N(); i++) count[i] = (Data::V(i) == Data::Fillval()) ? 0 : 1;
   return;
  }

  if(Data::N() != d.N()) return;
  for(size_t i = 0; i < Data::N(); i++)
   if(d(i) != Data::Fillval())
   {
    if(Data::V(i) == Data::Fillval())
    {
     Data::V(i) = d(i);
     count[i]   = 1;
    }
    else
    {
     Data::V(i) += d(i);
     count[i]++;
    }
   }
 }

 Averager& Div()
 {
  if(!*this) return *this;
  for(size_t i = 0; i < Data::N(); i++)
   if(count[i] != 0) Data::V(i) /= count[i];
  return *this;
 }
};