/* libquvi

 * Copyright (C) 2012  Toni Gundogdu <legatvs@gmail.com>

 *

 * This file is part of libquvi <http://quvi.sourceforge.net/>.

 *

 * This library is free software: you can redistribute it and/or

 * modify it under the terms of the GNU Affero General Public

 * License as published by the Free Software Foundation, either

 * version 3 of the License, or (at your option) any later version.

 *

 * This library 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 Affero General Public License for more details.

 *

 * You should have received a copy of the GNU Affero General

 * Public License along with this library.  If not, see

 * <http://www.gnu.org/licenses/>.

 */

/*

 * NOTE: The error messages produced in these functions are intended for

 *       developers. They would typically be seen when a new script is

 *       being developed or an old one is being maintained.

 *

 *       These messages should be clear, indicating the actual error,

 *       minimizing the time spent on locating the problem in the script.

 */

#include "config.h"

#include <lauxlib.h>

#include <glib.h>

#include "quvi.h"

/* -- */

#include "_quvi_s.h"

#include "_quvi_scan_s.h"

#include "_quvi_script_s.h"

/* -- */

#include "lua/setfield.h"

#include "lua/def.h"

static const gchar script_func[] = "parse";

static void _foreach_media_url(lua_State *l, _quvi_scan_t qs,

                               const gchar *script_path)

{

  lua_pushnil(l);

  while (lua_next(l, LI_KEY))

    {

      if (lua_isstring(l, LI_KEY) && lua_isstring(l, LI_VALUE))

        {

          const gchar *url = lua_tostring(l, LI_VALUE);

          qs->url.media = g_slist_prepend(qs->url.media, g_strdup(url));

        }

      lua_pop(l, 1);

    }

  qs->url.media = g_slist_reverse(qs->url.media);

}

/* Check for 'qargs.media_url'. */

static void _chk_media_url(lua_State *l, _quvi_scan_t qs,

                           const gchar *script_path)

{

  lua_pushstring(l, SS_MEDIA_URL);

  lua_gettable(l, LI_KEY);

  if (lua_istable(l, LI_VALUE))

    _foreach_media_url(l, qs, script_path);

  else

    {

      g_warning("%s: %s: should return a dictionary containing "

                "the `qargs.%s'",

                script_path, script_func, SS_MEDIA_URL);

    }

  lua_pop(l, 1);

}

QuviError l_exec_scan_script_parse(gpointer p, gpointer _qss,

                                   const gchar *data)

{

  _quvi_script_t qss;

  _quvi_scan_t qs;

  lua_State *l;

  qss = (_quvi_script_t) _qss;

  qs = (_quvi_scan_t) p;

  l = qs->handle.quvi->handle.lua;

  lua_pushnil(l);

  if (luaL_dofile(l, qss->fpath->str))

    luaL_error(l, "%s", lua_tostring(l, -1));

  lua_getglobal(l, script_func);

  if (!lua_isfunction(l, -1))

    {

      luaL_error(l, "%s: the function `%s' was not found",

                 qss->fpath->str, script_func);

    }

  lua_newtable(l);

  l_set_reg_userdata(l, USERDATA_QUVI_T, (gpointer) qs->handle.quvi);

  l_setfield_s(l, SS_INPUT_URL, qs->url.input->str, -1);

  l_setfield_s(l, SS_CONTENT, data, -1);

  if (lua_pcall(l, 1, 1, 0))

    {

      g_string_assign(qs->handle.quvi->status.errmsg, lua_tostring(l, -1));

      return (QUVI_ERROR_SCRIPT);

    }

  if (!lua_istable(l, -1))

    {

      static const gchar *_E =

        "%s: %s: must return a dictionary, this is typically the `qargs'";

      luaL_error(l, _E, qss->fpath->str, script_func);

    }

  _chk_media_url(l, qs, qss->fpath->str);

  lua_pop(l, 1);

  return (QUVI_OK);

}

/* vim: set ts=2 sw=2 tw=72 expandtab: */