#pragma once
#include "actiondep.h"
#include "ncfilew.h"
#include "ncfuncs.h"

class GradMethods
{
 public:
 using DataType = float;

 static DataType ToNum(const MString& str) { return michlib_internal::RealType<sizeof(DataType)>::String2Real(str.Buf()); }

 struct MinMax
 {
  bool     automin, automax, log;
  DataType min, max;
  DataType fill;
 };

 class Matrix;
 class NCFileW;
};

class GradMethods::Matrix
{
 public:
 using MDataType = michlib::uint2;

 private:
 size_t                 nx, ny;
 std::vector<MDataType> data;

 public:
 Matrix(const std::vector<DataType>& in, size_t nx_, size_t ny_, struct MinMax minmax);

 void Grad();

 auto Nx() const { return nx; }
 auto Ny() const { return ny; }

 const auto& V(size_t ix, size_t iy) const { return data[iy * nx + ix]; }

 auto& V(size_t ix, size_t iy) { return data[iy * nx + ix]; }

 const auto& Data() const { return data; }
};

class GradMethods::NCFileW: public NCFileWBase
{
 public:
 MString Create(const MString& name, const MString& history, const std::vector<MString>& vnames, const std::vector<MString>& lnames, const std::vector<GradMethods::DataType>& lons,
                const std::vector<GradMethods::DataType>& lats, int compress);
 MString WriteVariable(const MString& name, const GradMethods::Matrix& data);
};

template<class T>
concept GradSupported = requires(T t, const MString& vname) {
 {
  t.ReadVar(vname)
 } -> std::same_as<std::vector<GradMethods::DataType>>;
};

ADD_ACTION(GRAD, grad, GradSupported<Source>, GradMethods);

template<class D> MString ActionGRAD::DoAction(const CLArgs& args, D& ds)
{
 auto resop = ds.Open(args);
 if(resop.Exist()) return "Can't open source: " + resop;

 MString name = args.contains("out") ? args.at("out") : "out.nc";

 MString min = args.contains("min") ? args.at("min") : "auto";
 MString max = args.contains("max") ? args.at("max") : "auto";

 int compress = args.contains("compress") ? args.at("compress").ToInt() : 3;

 std::vector<Matrix> data;

 std::vector<MString> lnames;

 // Read data
 for(size_t i = 0; i < ds.NVar(); i++)
 {
  const MString& name  = ds.VarNames()[i];
  const MString& lname = ds.LongNames()[i];
  bool           hmin  = args.contains(name + "_min");
  bool           hmax  = args.contains(name + "_max");
  struct MinMax  minmax;

  minmax.log = args.contains(name + "_log");

  if(hmin)
  {
   MString vmin   = args.at(name + "_min");
   minmax.automin = (vmin == "auto");
   minmax.min     = ToNum(vmin);
  }
  else
  {
   minmax.automin = (min == "auto");
   minmax.min     = ToNum(min);
  }

  if(hmax)
  {
   MString vmax   = args.at(name + "_max");
   minmax.automax = (vmax == "auto");
   minmax.max     = ToNum(vmax);
  }
  else
  {
   minmax.automax = (max == "auto");
   minmax.max     = ToNum(max);
  }

  minmax.fill = ds.FillVal(name);

  data.emplace_back(ds.ReadVar(name), ds.Nx(), ds.Ny(), minmax);
  lnames.emplace_back(lname + ", gradient");
 }

 NCFileW fw;
 fw.Create(name, (ds.History().Exist() ? (ds.History() + "; ") : "") + args.at("_cmdline"), ds.VarNames(), lnames, ds.ReadLons(), ds.ReadLats(), compress);

 for(size_t i = 0; i < ds.NVar(); i++)
 {
  const MString& name = ds.VarNames()[i];
  data[i].Grad();
  fw.WriteVariable(name, data[i]);
 }

 return "";
};