////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2017-2024 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <iostream>
#include <list>
#include <string>

#include "bp-table.h"
#include "cdef-manager.h"
#include "child-list.h"
#include "display.h"
#include "error.h"
#include "event-manager.h"
#include "gtk-manager.h"
#include "help.h"
#include "input.h"
#include "interpreter-private.h"
#include "interpreter.h"
#include "load-path.h"
#include "load-save.h"
#include "ov.h"
#include "ovl.h"
#include "pager.h"
#include "symtab.h"

OCTAVE_BEGIN_NAMESPACE(octave)

interpreter& __get_interpreter__ ()
{
  interpreter *interp = interpreter::the_interpreter ();

  if (! interp)
    {
      std::cerr << "fatal error: octave interpreter context missing" << std::endl;
      abort ();
    }

  return *interp;
}

dynamic_loader&
__get_dynamic_loader__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_dynamic_loader ();
}

error_system&
__get_error_system__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_error_system ();
}

gh_manager&
__get_gh_manager__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_gh_manager ();
}

help_system&
__get_help_system__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_help_system ();
}

input_system&
__get_input_system__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_input_system ();
}

output_system&
__get_output_system__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_output_system ();
}

load_path&
__get_load_path__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_load_path ();
}

load_save_system&
__get_load_save_system__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_load_save_system ();
}

event_manager&
__get_event_manager__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_event_manager ();
}

type_info&
__get_type_info__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_type_info ();
}

symbol_table&
__get_symbol_table__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_symbol_table ();
}

symbol_scope
__get_current_scope__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_current_scope ();
}

symbol_scope
__require_current_scope__ ()
{
  symbol_scope scope = __get_current_scope__ ();

  if (! scope)
    error ("__require_current_scope__: symbol table scope missing");

  return scope;
}

tree_evaluator&
__get_evaluator__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_evaluator ();
}

bp_table&
__get_bp_table__ ()
{
  tree_evaluator& tw = __get_evaluator__ ();

  return tw.get_bp_table ();
}

child_list&
__get_child_list__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_child_list ();
}

cdef_manager&
__get_cdef_manager__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_cdef_manager ();
}

display_info&
__get_display_info__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_display_info ();
}

gtk_manager&
__get_gtk_manager__ ()
{
  interpreter& interp = __get_interpreter__ ();

  return interp.get_gtk_manager ();
}

octave_value
get_function_handle (interpreter& interp, const octave_value& arg,
                     const std::string& parameter_name)
{
  std::list<std::string> parameter_names;
  parameter_names.push_back (parameter_name);
  return get_function_handle (interp, arg, parameter_names);
}

// May return a function handle object, inline function object, or
// function object.

octave_value
get_function_handle (interpreter& interp, const octave_value& arg,
                     const std::list<std::string>& parameter_names)
{
  if (arg.is_function_handle () || arg.is_inline_function ())
    return arg;
  else if (arg.is_string ())
    {
      std::string fstr = arg.string_value ();

      if (fstr.empty ())
        return octave_value ();

      symbol_table& symtab = interp.get_symbol_table ();

      octave_value fcn = symtab.find_function (fstr);

      if (fcn.is_defined ())
        return fcn;

      // Possibly warn here that passing the function body in a
      // character string is discouraged.

      octave_value_list args (parameter_names.size () + 1);
      octave_idx_type i = 0;
      args(i++) = fstr;
      for (const auto& pname : parameter_names)
        args(i++) = pname;

      octave_value_list tmp = interp.feval ("inline", args, 1);

      if (tmp.length () > 0)
        return tmp(0);
    }

  return octave_value ();
}

OCTAVE_END_NAMESPACE(octave)