#include <mruby.h>
#include <mruby/array.h>
#include <mruby/hash.h>
#include <mruby/proc.h>
#include <mruby/variable.h>
#include <mruby/presym.h>

mrb_value mrb_proc_local_variables(mrb_state *mrb, const struct RProc *proc);

static mrb_value
binding_local_variables(mrb_state *mrb, mrb_value self)
{
  const struct RProc *proc = mrb_proc_ptr(mrb_iv_get(mrb, self, MRB_SYM(proc)));
  return mrb_proc_local_variables(mrb, proc);
}

const struct RProc *mrb_proc_get_caller(mrb_state *mrb, struct REnv **env);

static mrb_value
mrb_f_binding(mrb_state *mrb, mrb_value self)
{
  struct RObject *obj;
  mrb_value binding;
  struct RProc *proc;
  struct REnv *env;

  obj = (struct RObject*)mrb_obj_alloc(mrb, MRB_TT_OBJECT, mrb_class_get(mrb, "Binding"));
  binding = mrb_obj_value(obj);
  proc = (struct RProc*)mrb_proc_get_caller(mrb, &env);
  mrb_iv_set(mrb, binding, MRB_SYM(proc), mrb_obj_value(proc));
  mrb_iv_set(mrb, binding, MRB_SYM(recv), self);
  mrb_iv_set(mrb, binding, MRB_SYM(env), mrb_obj_value(env));
  return binding;
}

void
mrb_mruby_binding_core_gem_init(mrb_state *mrb)
{
  struct RClass *binding = mrb_define_class(mrb, "Binding", mrb->object_class);
  mrb_undef_class_method(mrb, binding, "new");
  mrb_undef_class_method(mrb, binding, "allocate");

  mrb_define_method(mrb, mrb->kernel_module, "binding", mrb_f_binding, MRB_ARGS_NONE());

  mrb_define_method(mrb, binding, "local_variables", binding_local_variables, MRB_ARGS_NONE());
}

void
mrb_mruby_binding_core_gem_final(mrb_state *mrb)
{
}