/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2009 Collabora Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Authors: Cosimo Alfarano <cosimo.alfarano@collabora.co.uk>
 */

#include "config.h"
#include "action-chain.h"

TplActionChain *
tpl_actionchain_new (GObject *obj,
    GAsyncReadyCallback cb,
    gpointer user_data)
{
  TplActionChain *ret = g_slice_new0 (TplActionChain);

  ret->chain = g_queue_new ();
  ret->simple = g_simple_async_result_new (obj, cb, user_data,
      tpl_actionchain_finish);

  return ret;
}


void
tpl_actionchain_free (TplActionChain *self)
{
  g_queue_free (self->chain);
  /* TODO free self->simple, I canont understand how */
  g_slice_free (TplActionChain, self);
}


gpointer
tpl_actionchain_get_object (TplActionChain *self)
{
  g_return_val_if_fail (self != NULL && self->simple != NULL, NULL);

  return g_async_result_get_source_object (G_ASYNC_RESULT (self->simple));
}


void
tpl_actionchain_prepend (TplActionChain *self,
    TplPendingAction func)
{
  g_queue_push_head (self->chain, func);
}


void
tpl_actionchain_append (TplActionChain *self,
    TplPendingAction func)
{
  g_queue_push_tail (self->chain, func);
}


void
tpl_actionchain_continue (TplActionChain *self)
{
  if (g_queue_is_empty (self->chain))
    {
      GSimpleAsyncResult *simple = self->simple;
      tpl_actionchain_free (self);
      g_simple_async_result_set_op_res_gboolean ((GSimpleAsyncResult *) simple, TRUE);
      g_simple_async_result_complete (simple);
    }
  else
    {
      TplPendingAction next_action = g_queue_pop_head (self->chain);
      next_action (self);
    }
}


void
tpl_actionchain_terminate (TplActionChain *self)
{
  GSimpleAsyncResult *simple = self->simple;

  tpl_actionchain_free (self);
  g_simple_async_result_set_op_res_gboolean ((GSimpleAsyncResult *) simple, FALSE);
  g_simple_async_result_complete (simple);
}


gboolean
tpl_actionchain_finish (GAsyncResult *result)
{
  return g_simple_async_result_get_op_res_gboolean ((GSimpleAsyncResult *) result);
}