/* libquvi

 * Copyright (C) 2012,2013  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_playlist_s.h"

#include "_quvi_script_s.h"

/* -- */

#include "lua/setfield.h"

#include "lua/chk.h"

#include "lua/def.h"

#include "misc/playlist.h"

static const gchar script_func[] = "parse";

static gpointer _playlist_media_new()

{

  _quvi_playlist_media_t qpm = g_new0(struct _quvi_playlist_media_s, 1);

  qpm->title = g_string_new(NULL);

  qpm->url = g_string_new(NULL);

  return (qpm);

}

static gboolean _new_media(lua_State *l, _quvi_playlist_t qp,

                           const gchar *script_path, const gint i,

                           _quvi_playlist_media_t *qpm)

{

  *qpm = _playlist_media_new();

  lua_pushnil(l);

  while (lua_next(l, LI_KEY)) /* For each qargs.media */

    {

      l_chk_assign_n(l, PSM_DURATION_MS, &(*qpm)->duration_ms);

      l_chk_assign_s(l, PSM_TITLE, (*qpm)->title, TRUE, FALSE);

      l_chk_assign_s(l, PSM_URL, (*qpm)->url, TRUE, TRUE);

      lua_pop(l, 1);

    }

  if ((*qpm)->url->len ==0)

    {

      m_playlist_media_free(*qpm);

      *qpm = NULL;

    }

  return ( ((*qpm)->url->len >0) ? TRUE:FALSE);

}

/* For each qargs.media */

static void _foreach_media(lua_State *l, _quvi_playlist_t qp,

                           const gchar *script_path)

{

  _quvi_playlist_media_t qpm;

  gint i;

  i = 0;

  lua_pushnil(l);

  while (lua_next(l, LI_KEY))

    {

      if (lua_istable(l, LI_VALUE))

        {

          if (_new_media(l, qp, script_path, ++i, &qpm) == TRUE)

            qp->media = g_slist_prepend(qp->media, qpm);

        }

      lua_pop(l, 1);

    }

  qp->media = g_slist_reverse(qp->media);

}

/* Check for qargs.media */

static void _chk_media(lua_State *l, _quvi_playlist_t qp,

                       const gchar *script_path)

{

  lua_pushstring(l, PS_MEDIA);

  lua_gettable(l, LI_KEY);

  if (lua_istable(l, LI_VALUE))

    _foreach_media(l, qp, script_path);

  else

    {

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

                "the `qargs.%s' dictionary",

                script_path, script_func, PS_MEDIA);

    }

  lua_pop(l, 1);

}

static void _chk_optional(lua_State *l, _quvi_playlist_t qp)

{

  lua_pushnil(l);

  while (lua_next(l, LI_KEY))

    {

      l_chk_assign_s(l, PS_THUMB_URL, qp->url.thumbnail, TRUE, TRUE);

      l_chk_assign_s(l, PS_ID, qp->id.playlist, TRUE, FALSE);

      l_chk_assign_s(l, PS_TITLE, qp->title, TRUE, FALSE);

      lua_pop(l, 1);

    }

}

extern gint c_reset(_quvi_t);

QuviError l_exec_playlist_script_parse(gpointer p, GSList *sl)

{

  _quvi_playlist_t qp;

  _quvi_script_t qs;

  lua_State *l;

  qp = (_quvi_playlist_t) p;

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

  c_reset(qp->handle.quvi);

  qs = (_quvi_script_t) sl->data;

  lua_getglobal(l, script_func);

  if (!lua_isfunction(l, -1))

    {

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

                 qs->fpath->str, script_func);

    }

  lua_newtable(l);

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

  l_setfield_s(l, PS_INPUT_URL, qp->url.input->str, -1);

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

    {

      g_string_assign(qp->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, qs->fpath->str, script_func);

    }

  _chk_optional(l, qp);

  _chk_media(l, qp, qs->fpath->str);

  lua_pop(l, 1);

  return (QUVI_OK);

}

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