#pragma once
#include "AVISO.h"
#include "AVISOLOCAL.h"
#include "BFileW.h"
#include "HYCOM.h"
#include "NEMO.h"
#include <utility>
#include <variant>

using michlib::BFileW;
using michlib::errmessage;
using michlib::GPL;
using michlib::message;

using DataVariants = std::variant<NEMOData, HYCOMData, AVISOData, AVISOLOCALData>;

template<class T>
concept InfoSupported = requires(T t) {
 {
  t.template Info()
 } -> std::convertible_to<MString>;
};

template<class T>
concept ParametersSupported = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args) {
 {
  t.template Parameters(pars, args).first
 } -> std::convertible_to<const BaseParameters*>;
};

template<class T>
concept ReadPSupported = requires(T t, const MString& vname, const BaseParameters* ip, size_t i) {
 {
  t.template Read(vname, ip, i)(0)
 } -> std::convertible_to<real>;
};
template<class T>
concept ReadSupported = requires(T t, const MString& vname, size_t i) {
 {
  t.template Read(vname, i)(0)
 } -> std::convertible_to<real>;
};

template<class T>
concept ReadUVPSupported = requires(T t, const BaseParameters* ip, size_t i) {
 {
  t.template ReadUV(ip, i).U(0, 0) + t.template ReadUV(ip, i).V(0, 0)
 } -> std::convertible_to<real>;
};

class Data: public DataVariants
{
 public:
 using TIndex = std::vector<size_t>;

 private:
 TIndex GetTIndexes(const MDateTime& b, const MDateTime& e) const
 {
  TIndex           out;
  auto             nt  = NTimes();
  const MDateTime& beg = (b < e) ? b : e;
  const MDateTime& end = (b > e) ? b : e;

  if(beg > Time(nt - 1) || end < Time(0)) return out;

  size_t ib = 0, ie = nt - 1;
  for(size_t i = 0; i < nt; i++)
   if(Time(i) >= beg)
   {
    ib = i;
    break;
   }

  for(size_t i = nt; i != 0; i--)
   if(Time(i - 1) <= end)
   {
    ie = i - 1;
    break;
   }

  out.resize(ie - ib + 1);
  for(size_t i = 0; i < ie - ib + 1; i++) out[i] = i + ib;
  return out;
 }

 TIndex GetTIndexes(const MString& regex)
 {
  {
   MDateTime time;
   if(time.FromString(regex)) return TIndex(1, GetTIndex(time));                   // Time, not regex
   if(regex == "BEGIN" || regex == "BEG" || regex == "FIRST") return TIndex(1, 0); // First time
   if(regex == "END" || regex == "LAST") return TIndex(1, NTimes() - 1);           // Last time
  }

  TIndex out;

  std::unique_ptr<regex_t> regbuf(new regex_t);
  if(0 != regcomp(regbuf.get(), regex.Buf(), REG_EXTENDED | REG_NOSUB)) return out;

  for(size_t i = 0; i < NTimes(); i++)
  {
   MString date = Time(i).ToString();
   if(0 != regexec(regbuf.get(), date.Buf(), 0, 0, 0)) continue;
   out.push_back(i);
  }

  return out;
 }

 size_t GetTIndex(const MDateTime& t)
 {
  size_t nt = NTimes();

  if(t <= Time(0)) return 0;
  if(t >= Time(nt - 1)) return nt - 1;
  for(size_t i = 0; i < nt - 1; i++)
   if(t >= Time(i) && t <= Time(i + 1)) return (t - Time(i) <= Time(i + 1) - t) ? i : (i + 1);
  return 0;
 }

 public:
 Data() = default;

 Data(DataVariants&& d): DataVariants(std::move(d)) {}

 MDateTime Time(size_t it) const
 {
  return std::visit([it = it](const auto& arg) -> auto { return arg.Time(it); }, *this);
 }
 size_t NTimes() const
 {
  return std::visit([](const auto& arg) -> auto { return arg.NTimes(); }, *this);
 }

 auto CheckVar(const MString& vname) const
 {
  return std::visit([&vname = std::as_const(vname)](const auto& arg) -> auto { return arg.CheckVar(vname); }, *this);
 }

 MString Init(const CLArgs& args)
 {
  MString src = args.contains("source") ? args.at("source") : "";
  if(!src.Exist()) return "No source specified";
  if(src == "NEMO")
  {
   NEMOData data;
   auto     res = data.Open(args);
   if(res.Exist()) return "Can't open source " + src + ":\n" + res;
   *this = Data(std::move(data));
  }
  else if(src == "AVISO")
  {
   AVISOData data;
   auto      res = data.Open(args);
   if(res.Exist()) return "Can't open source " + src + ":\n" + res;
   *this = Data(std::move(data));
  }
  else if(src == "AVISOLOCAL")
  {
   AVISOLOCALData data;
   auto           res = data.Open(args);
   if(res.Exist()) return "Can't open source " + src + ":\n" + res;
   *this = Data(std::move(data));
  }
  else if(src == "HYCOM")
  {
   HYCOMData data;
   auto      res = data.Open(args);
   if(res.Exist()) return "Can't open source " + src + ":\n" + res;
   *this = Data(std::move(data));
  }
  else
   return "Unknown source: " + src;
  return "";
 }

 MString ActionInfo(const CLArgs& args);
 MString ActionTsc(const CLArgs& args);
 MString ActionUV(const CLArgs& args);
};