#pragma once
#include "BFileR.h"
#include "actiondep.h"

//using michlib::message;

class InterpolateMethods
{
 protected:
 enum class Mode
 {
  INVALID,
  VYLETSTART,
  VYLETEND
 };
 struct DataPoint
 {
  real      lon, lat;
  MDateTime t;
 };

 class VyletFile
 {
  michlib::BFileR         fr;
  bool                    invtime;
  bool                    usestart;
  MDateTime               beg, end, t0;
  michlib::CompiledParser xy2lon, xy2lat;
  real                    x, y;

  public:
  MString Open(const MString& name, Mode mode);
 };

 static Mode GetMode(const CLArgs& args);
};

ADD_ACTION(Interpolate, interpolate, CanInterpolate2D<Source>, InterpolateMethods);

template<class D> MString ActionInterpolate::DoAction(const CLArgs& args, D& ds)
{
 Mode mode = GetMode(args);
 if(mode == Mode::INVALID) return "Unknown mode";

 if(!args.contains("in")) return "No vylet data file specified";
 MString in = args.at("in");

 if(!args.contains("out")) return "No output file specified";
 MString out = args.at("out");

 michlib::BFileR fr;
 if(fr.Open(in) != ERR_NOERR) return "Can't open file " + in;

 std::vector<struct DataPoint> datapoints;
 {
  bool invtime;
  {
   fr.UsePrefix("");
   MString method = fr.ParameterSValue("Method", "");
   if(method == "Bicubic" || method == "BicubicL")
    invtime = false;
   else if(method == "BicubicI" || method == "BicubicIL")
    invtime = true;
   else
    return "Unknown method in the file " + in;
  }

  MDateTime beg, end;
  {
   fr.UsePrefix("Datafile_Info");
   MString s;
   s = fr.ParameterSValue("BeginDate", "");
   beg.FromString(s);
   s = fr.ParameterSValue("EndDate", "");
   end.FromString(s);
  }

  MDateTime t0;
  {
   fr.UsePrefix("");
   auto tbeg = static_cast<time_t>(fr.ParameterRValue("tbeg", 0.0) * 86400);
   if(invtime)
   {
    t0 = end;
    t0.AddSeconds(-tbeg);
   }
   else
   {
    t0 = beg;
    t0.AddSeconds(tbeg);
   }
  }

  michlib::CompiledParser xy2lon, xy2lat;
  real                    x, y;
  michlib::ParserVars     pv;

  pv["x"] = &x;
  pv["y"] = &y;

  fr.UsePrefix("Datafile_Info");
  if(!ArifmeticCompiler(fr.ParameterSValue("xy2lon", ""), xy2lon, &pv)) return "Can't find xy2lon in the file " + in;
  if(!ArifmeticCompiler(fr.ParameterSValue("xy2lat", ""), xy2lat, &pv)) return "Can't find xy2lat in the file " + in;

  auto resop = ds.Open(args);
  if(resop.Exist()) return "Can't open source: " + resop;

  for(size_t i = 0; i < fr.Rows(); i++)
  {
   if(mode == Mode::VYLETSTART)
   {
    x = fr[0][i];
    y = fr[1][i];
    real lon, lat;
    xy2lon.Run(lon);
    xy2lat.Run(lat);
    datapoints.emplace_back(lon, lat, t0);
   }
   if(mode == Mode::VYLETEND)
   {
    x = fr[2][i];
    y = fr[3][i];
    real lon, lat;
    xy2lon.Run(lon);
    xy2lat.Run(lat);
    time_t    t    = static_cast<time_t>(fr[4][i] * 86400);
    MDateTime time = invtime ? end : beg;
    time.AddSeconds((invtime ? -1 : 1) * t);
    datapoints.emplace_back(lon, lat, time);
   }
  }
 }

 if(datapoints.size() == 0) return "No data readed from file " + in;

 struct Region reg;
 reg.lonb = datapoints[0].lon;
 reg.lone = datapoints[0].lon;
 reg.latb = datapoints[0].lat;
 reg.late = datapoints[0].lat;

 for(const auto& p: datapoints)
 {
  if(p.lon < reg.lonb) reg.lonb = p.lon;
  if(p.lat < reg.latb) reg.latb = p.lat;
  if(p.lon > reg.lone) reg.lone = p.lon;
  if(p.lat > reg.late) reg.late = p.lat;
 }

 return "";
 /*

 if(!args.contains("var")) return "Variable not specified";
 MString vname = args.at("var");
 if(!ds.CheckVar(vname)) return "Variable " + vname + " not exists in this dataset";
 pars.SetParameter("variable", vname);

 std::unique_ptr<const BaseParameters> sourcepars;
 if constexpr(ParametersSupported<D>)
 {
  if constexpr(ParametersRequiredRegion<D>)
  {
   auto [p, err] = ds.Parameters(pars, args, reg);
   if(err.Exist()) return err;
   sourcepars.reset(p);
  }
  else
  {
   auto [p, err] = ds.Parameters(pars, args);
   if(err.Exist()) return err;
   sourcepars.reset(p);
  }
 }
 auto p = sourcepars.get();

 auto data = Read(ds, vname, p, tindexes);
 if(!data) return "Can't read data";

 return "";
 */
};