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#pragma once
namespace saw {
namespace impl {
template<typename Schema>
struct netcdf_primitive_id {
static_assert(always_false<Schema>, "Not a primitive id");
};
template<>
struct netcdf_primitive_id<schema::Int32> {
static constexpr nc_type value = NC_INT;
};
template<>
struct netcdf_primitive_id<schema::UInt32> {
static constexpr nc_type value = NC_UINT;
};
template<>
struct netcdf_primitive_id<schema::Int64> {
static constexpr nc_type value = NC_INT64;
};
template<>
struct netcdf_primitive_id<schema::UInt64> {
static constexpr nc_type value = NC_UINT64;
};
template<>
struct netcdf_primitive_id<schema::Float32> {
static constexpr nc_type value = NC_FLOAT;
};
template<>
struct netcdf_primitive_id<schema::Float64> {
static constexpr nc_type value = NC_DOUBLE;
};
template<typename Schema>
struct netcdf_is_group {
static constexpr bool value = false;
};
template<typename... T, string_literal... Lits>
struct netcdf_is_group<schema::Struct<schema::Member<T,Lits>...>> {
static constexpr bool value = true;
};
template<typename Schema, typename ToEncode>
struct netcdf_decode;
template<typename T, size_t N, typename ToDecode>
struct netcdf_decode<schema::Primitive<T,N>, ToDecode> {
using Schema = schema::Primitive<T,N>;
static error_or<void> decode(data<Schema, ToDecode>& to, int from, int nc_varid){
int rc{};
nc_type nc_vartype{};
int nc_dimnum{};
std::array<int,NC_MAX_VAR_DIMS> nc_dimids;
rc = nc_inq_var(from, nc_varid, nullptr, &nc_vartype, &nc_dimnum, &nc_dimids[0], nullptr);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
if(nc_vartype != netcdf_primitive_id<schema::Primitive<T,N>>::value){
return make_error<err::critical>();
}
if(nc_dimnum != 0){
return make_error<err::critical>();
}
typename native_data_type<schema::Primitive<T,N>>::type val{};
rc = nc_get_var(from, nc_varid, &val);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
to.set(val);
return void_t {};
}
};
template<typename T, size_t Dim, typename ToDecode>
struct netcdf_decode<schema::Array<T,Dim>, ToDecode> {
using Schema = schema::Array<T,Dim>;
template<std::size_t Level>
static error_or<void> decode_level(data<Schema, ToDecode>& to, int from, int nc_varid, std::array<std::size_t, Dim>& index, const std::array<size_t,Dim>& count){
if constexpr ( Level == Dim ){
int rc{};
typename native_data_type<T>::type val;
rc = nc_get_vara(from, nc_varid, index.data(), count.data(), &val);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
to.at(index).set(val);
}else{
const std::size_t dim_size = to.get_dim_size(Level);
for(index[Level] = 0; index[Level] < dim_size; ++index[Level]){
auto eov = decode_level<Level+1>(to, from, nc_varid, index, count);
if(eov.is_error()){
return eov;
}
}
}
return void_t{};
}
static error_or<void> decode(data<Schema, ToDecode>& to, int from, int nc_varid){
int rc{};
nc_type nc_vartype{};
int nc_dimnum{};
std::array<int, NC_MAX_VAR_DIMS> nc_dimids;
rc = nc_inq_var(from, nc_varid, nullptr, &nc_vartype, &nc_dimnum, &nc_dimids[0], nullptr);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
if(nc_vartype != netcdf_primitive_id<T>::value){
return make_error<err::critical>();
}
if(nc_dimnum != Dim){
return make_error<err::critical>();
}
std::array<std::size_t, Dim> dims;
std::array<size_t, Dim> count;
for(std::size_t i = 0; i < Dim; ++i){
rc = nc_inq_dim(from, nc_dimids[i], nullptr, &dims[i]);
if(rc != NC_NOERR){
return make_error<err::critical>();
}
count[i] = 1;
}
to = {dims};
std::array<std::size_t, Dim> index;
return decode_level<0>(to, from, nc_varid, index, count);
}
};
template<typename... T, string_literal... Lits, typename ToDecode>
struct netcdf_decode<schema::Struct<schema::Member<T,Lits>...>, ToDecode> {
using Schema = schema::Struct<schema::Member<T,Lits>...>;
template<std::size_t i>
static error_or<void> decode_member(data<Schema,ToDecode>& to, int from){
using Type = typename parameter_pack_type<i,T...>::type;
constexpr string_literal Literal = parameter_key_pack_type<i, Lits...>::literal;
{
/**
* We have to ask for the internal id of the netcdf structure
*/
if constexpr (netcdf_is_group<Type>::value){
int nc_group_id{};
int rc {};
rc = nc_inq_ncid(from, Literal.data.data(), &nc_group_id);
if(rc != NC_NOERR) {
return make_error<err::critical>();
}
auto eov = netcdf_decode<Type, ToDecode>::decode(to.template get<Literal>(), nc_group_id);
if(eov.is_error()){
return eov;
}
}else{
int nc_varid{};
int rc {};
rc = nc_inq_varid(from, Literal.data.data(), &nc_varid);
if(rc != NC_NOERR) {
return make_error<err::critical>();
}
auto eov = netcdf_decode<Type, ToDecode>::decode(to.template get<Literal>(), from, nc_varid);
}
}
if constexpr ((i+1) < sizeof...(T)){
auto eov = decode_member<i+1>(to, from);
if(eov.is_error()){
return eov;
}
}
return void_t{};
}
static error_or<void> decode(data<Schema, ToDecode>& to, int from){
if constexpr (sizeof...(T) > 0){
auto eov = decode_member<0>(to, from);
return eov;
}
return void_t{};
}
};
}
}
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