#include "oboy.h"

#include <caml/mlvalues.h>
#include <caml/callback.h>
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/misc.h>
#include <caml/osdeps.h>

OBoy::OBoy(QObject *parent) : QObject(parent)
{

}

// https://caml.inria.fr/pub/docs/manual-ocaml/intfc.html
// http://www.mega-nerd.com/erikd/Blog/CodeHacking/Ocaml/calling_ocaml.html

QString OBoy::name() const
{
    CAMLparam0();

    value * closure_f = caml_named_value("oboy_name");
    if (closure_f == nullptr) {
        CAMLdrop;
        return QString("<Unreachable>");
    }

    const char *str = String_val(caml_callback(*closure_f, Val_unit));
    CAMLdrop;
    return QString(str);
}

QString OBoy::version() const
{
    CAMLparam0();

    value * closure_f = caml_named_value("oboy_version");
    if (closure_f == nullptr) {
        CAMLdrop;
        return QString("<Unreachable>");
    }

    const char *str = String_val(caml_callback(*closure_f, Val_unit));
    CAMLdrop;
    return QString(str);
}

bool OBoy::load(const QString &path)
{
    CAMLparam0();
    CAMLlocal1(ocaml_path) ;

    value * closure_f = caml_named_value("oboy_load");
    if (closure_f == nullptr) {
        CAMLdrop;
        return false;
    }

    QString truncated(path);
    truncated.remove(0, 7); // remove file://
    QByteArray ba = truncated.toLocal8Bit();

    ocaml_path = caml_copy_string_of_os(ba.data());

    _loaded = Bool_val(caml_callback(*closure_f, ocaml_path));
    this->loadedChanged(_loaded);
    CAMLdrop;
    return _loaded;
}

bool OBoy::loaded() const
{
    return _loaded;
}