////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1993-2021 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/>.
//
////////////////////////////////////////////////////////////////////////

// Born February 20, 1992.

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

#include <iostream>
#include <string>

#include "file-ops.h"
#include "getopt-wrapper.h"
#include "lo-error.h"
#include "oct-env.h"
#include "str-vec.h"

#include "Cell.h"
#include "defun.h"
#include "display.h"
#include "error.h"
#include "input.h"
#include "interpreter.h"
#include "octave.h"
#include "oct-hist.h"
#include "oct-map.h"
#include "ovl.h"
#include "options.h"
#include "ov.h"
#include "parse.h"
#include "sysdep.h"
#include "usage.h"

namespace octave
{
  cmdline_options::cmdline_options (void)
  {
    m_all_args.resize (1);
    m_all_args[0] = "";
  }

  cmdline_options::cmdline_options (int argc, char **argv)
  {
    // Save raw program arguments.
    m_all_args = string_vector (argv, argc);

    while (true)
      {
        int long_idx;

        int optc = octave_getopt_long_wrapper (argc, argv, short_opts,
                                               long_opts, &long_idx);

        if (optc < 0)
          break;

        switch (optc)
          {
          case '?':
            // Unrecognized option.  getopt_long already printed a message about
            // it, so we will just print the usage string and exit.
            octave_print_terse_usage_and_exit ();
            break;

          case 'H':
            m_read_history_file = false;
            break;

          case 'W':
            m_no_window_system = true;
            break;

          case 'V':
            m_verbose_flag = true;
            break;

          case 'd':
            // This is the same as yydebug in parse.y.
            octave_debug++;
            break;

          case 'f':
            m_read_init_files = false;
            m_read_site_files = false;
            break;

          case 'h':
            octave_print_verbose_usage_and_exit ();
            break;

          case 'i':
            m_forced_interactive = true;
            break;

          case 'p':
            if (octave_optarg_wrapper ())
              m_command_line_path.push_back (octave_optarg_wrapper ());
            break;

          case 'q':
            m_inhibit_startup_message = true;
            break;

          case 'x':
            m_echo_commands = true;
            break;

          case 'v':
            octave_print_version_and_exit ();
            break;

          case BUILT_IN_DOCSTRINGS_FILE_OPTION:
            if (octave_optarg_wrapper ())
              m_docstrings_file = octave_optarg_wrapper ();;
            break;

          case DOC_CACHE_FILE_OPTION:
            if (octave_optarg_wrapper ())
              m_doc_cache_file = octave_optarg_wrapper ();
            break;

          case EVAL_OPTION:
            if (octave_optarg_wrapper ())
              {
                if (m_code_to_eval.empty ())
                  m_code_to_eval = octave_optarg_wrapper ();
                else
                  m_code_to_eval += (std::string (" ")
                                     + octave_optarg_wrapper ());
              }
            break;

          case EXEC_PATH_OPTION:
            if (octave_optarg_wrapper ())
              m_exec_path = octave_optarg_wrapper ();
            break;

          case EXPERIMENTAL_TERMINAL_WIDGET_OPTION:
            m_experimental_terminal_widget = true;
            break;

          case GUI_OPTION:
            m_gui = true;
            break;

          case IMAGE_PATH_OPTION:
            if (octave_optarg_wrapper ())
              m_image_path = octave_optarg_wrapper ();
            break;

          case INFO_FILE_OPTION:
            if (octave_optarg_wrapper ())
              m_info_file = octave_optarg_wrapper ();
            break;

          case INFO_PROG_OPTION:
            if (octave_optarg_wrapper ())
              m_info_program = octave_optarg_wrapper ();
            break;

          case LINE_EDITING_OPTION:
            m_forced_line_editing = m_line_editing = true;
            break;

          case NO_GUI_OPTION:
            m_gui = false;
            break;

          case NO_INIT_FILE_OPTION:
            m_read_init_files = false;
            break;

          case NO_INIT_PATH_OPTION:
            m_set_initial_path = false;
            break;

          case NO_LINE_EDITING_OPTION:
            m_line_editing = false;
            break;

          case NO_SITE_FILE_OPTION:
            m_read_site_files = false;
            break;

          case PERSIST_OPTION:
            m_persist = true;
            break;

          case SERVER_OPTION:
            m_server = true;
            break;

          case TEXI_MACROS_FILE_OPTION:
            if (octave_optarg_wrapper ())
              m_texi_macros_file = octave_optarg_wrapper ();
            break;

          case TRADITIONAL_OPTION:
            m_traditional = true;
            m_persist = true;
            break;

          default:
            // getopt_long should print a message about unrecognized options and
            // return '?', which is handled above.  If we end up here, it is
            // because there was an option but we forgot to handle it.
            // That should be fatal.
            panic_impossible ();
            break;
          }
      }

    m_remaining_args = string_vector (argv+octave_optind_wrapper (),
                                      argc-octave_optind_wrapper ());
  }

  octave_value cmdline_options::as_octave_value (void) const
  {
    octave_scalar_map m;

    m.assign ("sys_argc", sys_argc ());
    m.assign ("sys_argv", string_vector (sys_argv ()));
    m.assign ("echo_commands", echo_commands ());
    m.assign ("forced_interactive", forced_interactive ());
    m.assign ("forced_line_editing", forced_line_editing ());
    m.assign ("gui", gui ());
    m.assign ("inhibit_startup_message", inhibit_startup_message ());
    m.assign ("line_editing", line_editing ());
    m.assign ("no_window_system", no_window_system ());
    m.assign ("persist", persist ());
    m.assign ("read_history_file", read_history_file ());
    m.assign ("read_init_files", read_init_files ());
    m.assign ("read_site_files", read_site_files ());
    m.assign ("server", server ());
    m.assign ("set_initial_path", set_initial_path ());
    m.assign ("traditional", traditional ());
    m.assign ("verbose_flag", verbose_flag ());
    m.assign ("code_to_eval", code_to_eval ());
    m.assign ("command_line_path", string_vector (command_line_path ()));
    m.assign ("docstrings_file", docstrings_file ());
    m.assign ("doc_cache_file", doc_cache_file ());
    m.assign ("exec_path", exec_path ());
    m.assign ("image_path", image_path ());
    m.assign ("info_file", info_file ());
    m.assign ("info_program", info_program ());
    m.assign ("texi_macros_file", texi_macros_file ());
    m.assign ("all_args", all_args ());
    m.assign ("remaining_args", remaining_args ());

    return m;
  }

  application *application::instance = nullptr;

  application::application (int argc, char **argv)
    : m_options (argc, argv)
  {
    init ();
  }

  application::application (const cmdline_options& opts)
    : m_options (opts)
  {
    init ();
  }

  // Note: Although the application destructor doesn't explicitly
  // perform any actions, it can't be declared "default" in the header
  // file if the octave::interpreter is an incomplete type.  Providing
  // an explicit definition of the destructor here is much simpler than
  // including the full declaration of octave::interpreter in the
  // octave.h header file.
  application::~application (void) { }

  void
  application::set_program_names (const std::string& pname)
  {
    m_program_invocation_name = pname;

    std::size_t pos = pname.find_last_of (sys::file_ops::dir_sep_chars ());

    m_program_name = (pos != std::string::npos) ? pname.substr (pos+1) : pname;
  }

  void
  application::intern_argv (const string_vector& args)
  {
    octave_idx_type nargs = args.numel ();

    if (nargs > 0)
      {
        // Skip first argument (program name).
        nargs--;

        m_argv.resize (nargs);

        for (octave_idx_type i = 0; i < nargs; i++)
          m_argv[i] = args[i+1];
      }
  }

  bool application::forced_interactive (void)
  {
    return instance ? instance->m_options.forced_interactive () : false;
  }

  // Provided for convenience.  Will be removed once we eliminate the
  // old terminal widget.
  bool application::experimental_terminal_widget (void) const
  {
    return (instance
            ? instance->m_options.experimental_terminal_widget () : false);
  }

  bool application::interpreter_initialized (void)
  {
    return m_interpreter ? m_interpreter->initialized () : false;
  }

  interpreter& application::create_interpreter (void)
  {
    if (! m_interpreter)
      m_interpreter = std::unique_ptr<interpreter> (new interpreter (this));

    return *m_interpreter;
  }

  void application::initialize_interpreter (void)
  {
    if (m_interpreter)
      m_interpreter->initialize ();
  }

  int application::execute_interpreter (void)
  {
    return m_interpreter ? m_interpreter->execute () : -1;
  }

  void application::delete_interpreter (void)
  {
    m_interpreter.reset ();
  }

  void application::init (void)
  {
    if (instance)
      throw std::runtime_error
        ("only one Octave application object may be active");

    instance = this;

    string_vector all_args = m_options.all_args ();

    set_program_names (all_args[0]);

    string_vector remaining_args = m_options.remaining_args ();

    std::string code_to_eval = m_options.code_to_eval ();

    m_have_script_file = ! remaining_args.empty ();

    m_have_eval_option_code = ! code_to_eval.empty ();

    if (m_have_eval_option_code && m_have_script_file)
      {
        std::cerr << R"(error: --eval "CODE" and script file are mutually exclusive options)" << std::endl;

        octave_print_terse_usage_and_exit ();
      }

    if (m_options.gui ())
      {
        if (m_options.no_window_system ())
          {
            std::cerr << "error: --gui and --no-window-system are mutually exclusive options" << std::endl;
            octave_print_terse_usage_and_exit ();
          }
        if (! m_options.line_editing ())
          {
            std::cerr << "error: --gui and --no-line-editing are mutually exclusive options" << std::endl;
            octave_print_terse_usage_and_exit ();
          }
        if (m_options.server ())
          {
            std::cerr << "error: --gui and --server are mutually exclusive options" << std::endl;
            octave_print_terse_usage_and_exit ();
          }
      }

    m_is_octave_program = ((m_have_script_file || m_have_eval_option_code)
                           && ! m_options.persist ()
                           && ! m_options.traditional ());

    // This should probably happen early.
    sysdep_init ();
  }

  int cli_application::execute (void)
  {
    interpreter& interp = create_interpreter ();

    int status = interp.execute ();

    return status;
  }
}

DEFUN (isguirunning, args, ,
       doc: /* -*- texinfo -*-
@deftypefn {} {} isguirunning ()
Return true if Octave is running in GUI mode and false otherwise.
@seealso{have_window_system}
@end deftypefn */)
{
  if (args.length () != 0)
    print_usage ();

  // FIXME: This isn't quite right, it just says that we intended to
  // start the GUI, not that it is actually running.

  return ovl (octave::application::is_gui_running ());
}

/*
%!assert (islogical (isguirunning ()))
%!error isguirunning (1)
*/

DEFUN (argv, args, ,
       doc: /* -*- texinfo -*-
@deftypefn {} {} argv ()
Return the command line arguments passed to Octave.

For example, if you invoked Octave using the command

@example
octave --no-line-editing --silent
@end example

@noindent
@code{argv} would return a cell array of strings with the elements
@option{--no-line-editing} and @option{--silent}.

If you write an executable Octave script, @code{argv} will return the list
of arguments passed to the script.  @xref{Executable Octave Programs}, for
an example of how to create an executable Octave script.
@end deftypefn */)
{
  if (args.length () != 0)
    print_usage ();

  return ovl (Cell (octave::application::argv ()));
}

/*
%!assert (iscellstr (argv ()))
%!error argv (1)
*/

DEFUN (cmdline_options, args, ,
       doc: /* -*- texinfo -*-
@deftypefn {} {} argv ()
Return a structure containing info about the command line arguments
passed to Octave.
@end deftypefn */)
{
  if (args.length () != 0)
    print_usage ();

  octave::application *app = octave::application::app ();

  if (! app)
    error ("invalid application context!");

  octave::cmdline_options opts = app->options ();

  return ovl (opts.as_octave_value ());
}

DEFUN (program_invocation_name, args, ,
       doc: /* -*- texinfo -*-
@deftypefn {} {} program_invocation_name ()
Return the name that was typed at the shell prompt to run Octave.

If executing a script from the command line (e.g., @code{octave foo.m})
or using an executable Octave script, the program name is set to the
name of the script.  @xref{Executable Octave Programs}, for an example of
how to create an executable Octave script.
@seealso{program_name}
@end deftypefn */)
{
  if (args.length () != 0)
    print_usage ();

  return ovl (octave::application::program_invocation_name ());
}

/*
%!assert (ischar (program_invocation_name ()))
%!error program_invocation_name (1)
*/

DEFUN (program_name, args, ,
       doc: /* -*- texinfo -*-
@deftypefn {} {} program_name ()
Return the last component of the value returned by
@code{program_invocation_name}.
@seealso{program_invocation_name}
@end deftypefn */)
{
  if (args.length () != 0)
    print_usage ();

  return ovl (octave::application::program_name ());
}

/*
%!assert (ischar (program_name ()))
%!error program_name (1)
*/