#define MICHLIB_NOSOURCE
#include "layereddata.h"

MString LayeredData::Info() const
{
 if(!isOk()) return "";
 MString d;
 for(size_t i = 0; i < NDepths(); i++) d += MString(" ") + "(" + i + " " + Depth(i) + ")";

 std::set<MString> vars;
 for(const auto& f: nc) GetVars(f.Get(), vars);

 MString svars;
 {
  bool first = true;
  for(const auto& v: vars)
  {
   svars += (first ? "" : ", ") + v;
   first = false;
  }
 }

 // clang-format off
 return
  "Dataset: " + Title() + "\n" +
  " Begin date: " + Time(0).ToString() + "\n" +
  " End date: " + Time(NTimes()-1).ToString() + "\n" +
  " Time step: " + Timestep() + " seconds\n" +
  " Time moments: " + NTimes() + "\n" +
  " Region: (" + lonb + " : " + lone + ") x (" + latb + " : " + late + ")\n" +
  " Grid: " + dname.nx + "x" + dname.ny + " (" + lonstep + " x " + latstep + ")\n" +
  " Depths:" + d + "\n" +
  " Supported variables: " + svars;
 // clang-format on
}

MString LayeredData::Open(const MString& dataset)
{
 nc.clear();
 MString proxyurl = GPL.ParameterSValue("USEPROXY", "");
 if(proxyurl.Exist()) proxy.Activate("all_proxy", proxyurl);

 nc.clear();
 size_t i = 1;
 while(true)
 {
  MString url = GPL.ParameterSValue(dataset + "_URL" + i, "");
  if(url.Exist())
  {
   //michlib::message("Open "+url);
   nc.emplace_back(std::move(url));
   if(!nc.back())
   {
    nc.clear();
    return "Can't connect to url " + url;
   }
  }
  else
   break;
  i++;
 }
 if(nc.size() == 0) return "No urls for dataset " + dataset + " specified in config";

 dname = GetDNames(nc[0].Get());
 if(!(dname.lonname.Exist() && dname.latname.Exist()))
 {
  nc.clear();
  return "Can't find longitude/latitude";
 }
 if(!dname.timename.Exist())
 {
  nc.clear();
  return "Can't find time";
 }

 auto cn = GetCNames(nc[0].Get());

 // Read times
 for(auto& f: nc)
 {
  MString ret = f.ReadTimes(cn.timename);
  if(ret.Exist())
  {
   nc.clear();
   return ret;
  }
  times.insert(times.end(), f.Times().begin(), f.Times().end());
 }
 std::sort(times.begin(), times.end());
 auto last = std::unique(times.begin(), times.end());
 times.erase(last, times.end());

 if(cn.depthname.Exist())
 {
  auto rdepths = nc[0]->VR(cn.depthname);
  if(!rdepths)
  {
   nc.clear();
   return "Can't read depths";
  }
  depths.resize(rdepths.DimLen(0));
  for(size_t i = 0; i < depths.size(); i++) depths[i] = rdepths(i);
 }
 else // Surface only data
 {
  depths.resize(1);
  depths[0] = 0;
 }

 auto lons = nc[0]->VR(cn.lonname);
 auto lats = nc[0]->VR(cn.latname);
 if(!(lons && lats))
 {
  nc.clear();
  return "Can't get longitudes/latitudes";
 }

 lonb    = lons(0);
 latb    = lats(0);
 lone    = lons(dname.nx - 1);
 late    = lats(dname.ny - 1);
 lonstep = (lone - lonb) / (dname.nx - 1);
 latstep = (late - latb) / (dname.ny - 1);

 return "";
}

std::pair<const BaseParameters*, MString> LayeredData::Parameters(michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& reg) const
{
 std::unique_ptr<struct Parameters> ppar{new struct Parameters};

 ppar->layer = args.contains("layer") ? args.at("layer").ToInteger<size_t>() : 0;
 if(!args.contains("depth") && ppar->layer >= NDepths()) return {nullptr, MString("Layer ") + ppar->layer + " is too deep!"};
 real depth = args.contains("depth") ? args.at("depth").ToReal() : Depth(ppar->layer);

 {
  auto dom  = DetGeoDomain(lonb, lone);
  real lon1 = ToGeoDomain(reg.lonb, dom);
  real lon2 = ToGeoDomain(reg.lone, dom);
  real lat1 = reg.latb;
  real lat2 = reg.late;

  // Special case when the longitude lies in a small sector between the end and the start
  if(lon1 < lonb) lon1 = lone;
  if(lon2 > lone) lon2 = lonb;

  ppar->yb = static_cast<size_t>(Floor((lat1 - latb) / latstep));
  ppar->ye = static_cast<size_t>(Ceil((lat2 - latb) / latstep));
  if(ppar->ye > dname.ny - 1) ppar->ye = dname.ny - 1;
  if(ppar->yb >= ppar->ye) return {nullptr, "Latb must be lesser then late"};

  ppar->xb = static_cast<size_t>(Floor((lon1 - lonb) / lonstep));
  ppar->xe = static_cast<size_t>(Ceil((lon2 - lonb) / lonstep));

  if(ppar->xb == ppar->xe) return {nullptr, "Lonb must be not equal late"};

  if(depth < 0.0 || depth > depths.back())
   ppar->layer = (depth < 0.0) ? 0 : (depths.size() - 1);
  else
   for(size_t i = 0; i < depths.size() - 1; i++)
   {
    if(depth >= depths[i] && depth <= depths[i + 1])
    {
     ppar->layer = (depth - depths[i] <= depths[i + 1] - depth) ? i : (i + 1);
     break;
    }
   }
 }

 pars.SetParameter("depth", Depth(ppar->layer));
 pars.SetParameter("layer", ppar->layer);
 pars.SetParameter("dataset", Title());
 pars.SetParameter("lonb", Lon(ppar->xb));
 pars.SetParameter("latb", Lat(ppar->yb));
 pars.SetParameter("lone", Lon(ppar->xe));
 pars.SetParameter("late", Lat(ppar->ye));

 return {ppar.release(), ""};
}

LayeredData::Data LayeredData::Read(const MString& vname, const BaseParameters* ip, size_t i) const
{
 if(!isOk()) return Data();
 bool nodepth = false;

 auto p               = dynamic_cast<const struct Parameters*>(ip);
 auto [name, id, tid] = VarNameLoc(vname, times[i]);
 if(!name.Exist()) // Conversion read
 {
  // ptemp from temp and sal
  if(vname == "ptemp")
  {
   auto temp = Read("temp", ip, i);
   auto sal  = Read("sal", ip, i);
   if(!(temp && sal)) return Data();
   auto out = temp;
   out.SetUnit("degrees_C");
   for(size_t ind = 0; ind < out.N(); ind++)
   {
    if(temp.IsFill(ind) || sal.IsFill(ind))
     out.V(ind) = out.Fillval();
    else
     out.V(ind) = Temp2PTemp(temp.V(ind), sal.V(ind), Depth(p->layer), out.Lon(ind), out.Lat(ind));
   }
   return out;
  }
  // temp from ptemp and sal
  if(vname == "temp")
  {
   auto temp = Read("ptemp", ip, i);
   auto sal  = Read("sal", ip, i);
   if(!(temp && sal)) return Data();
   auto out = temp;
   out.SetUnit("degrees_C");
   for(size_t ind = 0; ind < out.N(); ind++)
   {
    if(temp.IsFill(ind) || sal.IsFill(ind))
     out.V(ind) = out.Fillval();
    else
     out.V(ind) = PTemp2Temp(temp.V(ind), sal.V(ind), Depth(p->layer), out.Lon(ind), out.Lat(ind));
   }
   return out;
  }
  // pdens from temp and sal
  if(vname == "pdens")
  {
   bool tempispot = HaveVar("ptemp");
   auto temp      = Read(tempispot ? "ptemp" : "temp", ip, i);
   auto sal       = Read("sal", ip, i);
   if(!(temp && sal)) return Data();
   auto out = temp;
   out.SetUnit("kg m-3");
   for(size_t ind = 0; ind < out.N(); ind++)
   {
    if(temp.IsFill(ind) || sal.IsFill(ind))
     out.V(ind) = out.Fillval();
    else
     out.V(ind) = tempispot ? PTemp2PDens(temp.V(ind), sal.V(ind), Depth(p->layer), out.Lon(ind), out.Lat(ind))
                            : Temp2PDens(temp.V(ind), sal.V(ind), Depth(p->layer), out.Lon(ind), out.Lat(ind));
   }
   return out;
  }
  // U and U2 from u and v
  if(vname == "U" || vname == "U2")
  {
   bool square = vname == "U2";
   auto u      = Read("u", ip, i);
   auto v      = Read("v", ip, i);
   if(!(u && v)) return Data();
   auto out = u;
   out.SetUnit(square ? ("(" + u.Unit() + ")2") : u.Unit());
   for(size_t ind = 0; ind < out.N(); ind++)
   {
    if(u.IsFill(ind) || v.IsFill(ind))
     out.V(ind) = out.Fillval();
    else
     out.V(ind) = square ? (u(ind) * u(ind) + v(ind) * v(ind)) : michlib::Hypot(u(ind), v(ind));
   }
   return out;
  }
  return Data();
 }

 // Direct read
 auto head = nc[id]->Header();
 for(const auto& v: head.Variables())
  if(v.Name() == name)
  {
   if(v.Dimensions().size() == 3) nodepth = true;
   if(v.Type().Id() == NC_SHORT) return ReadVarRaw<int2>(nc[id], name, tid, nodepth, p);
   if(v.Type().Id() == NC_INT) return ReadVarRaw<int>(nc[id], name, tid, nodepth, p);
   if(v.Type().Id() == NC_FLOAT) return ReadVarRaw<float>(nc[id], name, tid, nodepth, p);
   if(v.Type().Id() == NC_DOUBLE) return ReadVarRaw<double>(nc[id], name, tid, nodepth, p);
  }

 return Data();
}

template<class DataType> LayeredData::Data LayeredData::ReadVarRaw(const NC& f, const MString& name, size_t i, bool nodepth, const struct LayeredData::Parameters* p) const
{
 real     unitmul = 1.0;
 DataType fill;
 real     offset = 0.0, scale = 1.0;

 {
  auto a_fill     = f->A<DataType>(name, "_FillValue");
  auto a_offset_d = f->A<double>(name, "add_offset");
  auto a_scale_d  = f->A<double>(name, "scale_factor");
  auto a_offset_f = f->A<float>(name, "add_offset");
  auto a_scale_f  = f->A<float>(name, "scale_factor");
  if(a_fill)
   fill = a_fill;
  else
  {
   if constexpr(std::is_floating_point_v<DataType>)
    fill = NAN;
   else
    fill = -1;
  }
  if(a_offset_d) offset = a_offset_d;
  if(a_scale_d) scale = a_scale_d;
  if(a_offset_f) offset = a_offset_f;
  if(a_scale_f) scale = a_scale_f;
 }

 MString unit;
 {
  auto unitatt = f->A<MString>(name, "units");
  if(unitatt) unit = unitatt;
 }
 if(unit == "m s-1" || unit == "m/s")
 {
  unitmul = 100.0;
  unit    = "cm/s";
 }

 Data data((p->xb < p->xe) ? (p->xe - p->xb + 1) : (dname.nx + p->xe - p->xb + 1), p->ye - p->yb + 1, Lon(p->xb), Lat(p->yb), lonstep, latstep, std::move(unit));

 if(p->xb < p->xe)
 {
  auto var =
      nodepth ? f->V<DataType>(name, {dname.lonname, p->xb, p->xe - p->xb + 1}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1})
              : f->V<DataType>(name, {dname.lonname, p->xb, p->xe - p->xb + 1}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1}, {dname.depthname, p->layer, 1});
  if(!var) return Data();
  if(var.DimLen(0) != data.Nx() || var.DimLen(1) != data.Ny()) return Data();

  for(size_t ix = 0; ix < var.DimLen(0); ix++)
   for(size_t iy = 0; iy < var.DimLen(1); iy++)
   {
    DataType v   = var(ix, iy);
    data(ix, iy) = (v == fill || isnan(v)) ? Data::Fillval() : ((v * scale + offset) * unitmul);
   }
 }
 else
 {
  auto var1 = nodepth ? f->V<DataType>(name, {dname.lonname, p->xb}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1})
                      : f->V<DataType>(name, {dname.lonname, p->xb}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1}, {dname.depthname, p->layer, 1});
  auto var2 = nodepth ? f->V<DataType>(name, {dname.lonname, 0, p->xe + 1}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1})
                      : f->V<DataType>(name, {dname.lonname, 0, p->xe + 1}, {dname.latname, p->yb, p->ye - p->yb + 1}, {dname.timename, i, 1}, {dname.depthname, p->layer, 1});
  if(!(var1 && var2)) return Data();
  if((var1.DimLen(0) + var2.DimLen(0)) != data.Nx() || var1.DimLen(1) != data.Ny() || var2.DimLen(1) != data.Ny()) return Data();
  for(size_t ix = 0; ix < var1.DimLen(0); ix++)
   for(size_t iy = 0; iy < var1.DimLen(1); iy++)
   {
    DataType v   = var1(ix, iy);
    data(ix, iy) = (v == fill || isnan(v)) ? Data::Fillval() : ((v * scale + offset) * unitmul);
   }
  for(size_t ix = 0; ix < var2.DimLen(0); ix++)
   for(size_t iy = 0; iy < var2.DimLen(1); iy++)
   {
    DataType v                    = var2(ix, iy);
    data(ix + var1.DimLen(0), iy) = (v == fill || isnan(v)) ? Data::Fillval() : ((v * scale + offset) * unitmul);
   }
 }
 return data;
}