#include <opm/input/eclipse/Deck/Deck.hpp>
#include <opm/input/eclipse/Units/UnitSystem.hpp>

#include <pybind11/pybind11.h>
#include "converters.hpp"
#include "export.hpp"


namespace {

    size_t size( const Deck& deck ) {
        return deck.size();
    }


    size_t count( const Deck& deck, const std::string& kw ) {
        return deck.count(kw);
    }

    bool hasKeyword( const Deck& deck, const std::string& kw ) {
        return deck.hasKeyword(kw);
    }

    const DeckKeyword& getKeyword_tuple( const Deck& deck, py::tuple kw_index ) {
        const std::string kw = py::cast<const std::string>(kw_index[0]);
        const size_t index = py::cast<size_t>(kw_index[1]);
        return deck[kw][index];
    }

    const DeckKeyword& getKeyword_string( const Deck& deck, const std::string& kw ) {
        return deck[kw].back();
    }

    const DeckKeyword& getKeyword_int( const Deck& deck, size_t index ) {
        return deck[index];
    }

    //This adds a keyword by copy
    void addKeyword(Deck& deck, const DeckKeyword kw) {
         deck.addKeyword(kw);
    }


}

void python::common::export_Deck(py::module &module) {

    // Note: In the below class we use std::shared_ptr as the holder type, see:
    //
    //  https://pybind11.readthedocs.io/en/stable/advanced/smart_ptrs.html
    //
    // this makes it possible to share the returned object with e.g. and
    //   opm.simulators.BlackOilSimulator Python object
    //
    py::class_< Deck, std::shared_ptr<Deck> >(module, "Deck")
        .def( "__len__", &size )
        .def( "__contains__", &hasKeyword )
        .def("__iter__",
             [] (const Deck &deck) { return py::make_iterator(deck.begin(), deck.end()); }, py::keep_alive<0, 1>())
        .def( "__getitem__", &getKeyword_int, ref_internal)
        .def( "__getitem__", &getKeyword_string, ref_internal)
        .def( "__getitem__", &getKeyword_tuple, ref_internal)
        .def( "__str__", &str<Deck>)

        .def("active_unit_system", [](const Deck& deck) -> const UnitSystem& {
               return deck.getActiveUnitSystem();
           } )

        .def("default_unit_system", [](const Deck& deck) -> const UnitSystem& {
               return deck.getDefaultUnitSystem();
           } )

        .def( "count", &count )
        .def( "add", &addKeyword)
      ;
}