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/*
   This file is part of GNUnet.
   Copyright (C) 2020 GNUnet e.V.

   GNUnet 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.

   GNUnet 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 program.  If not, see <http://www.gnu.org/licenses/>.

   SPDX-License-Identifier: AGPL3.0-or-later
 */
/**
 * @author Tobias Frisch
 * @file src/messenger/messenger_api_list_tunnels.c
 * @brief messenger api: client and service implementation of GNUnet MESSENGER service
 */

#include "messenger_api_list_tunnels.h"

void
init_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels)
{
  GNUNET_assert(tunnels);

  tunnels->head = NULL;
  tunnels->tail = NULL;
}

void
clear_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels)
{
  GNUNET_assert(tunnels);

  struct GNUNET_MESSENGER_ListTunnel *element;

  for (element = tunnels->head; element; element = tunnels->head)
  {
    GNUNET_CONTAINER_DLL_remove(tunnels->head, tunnels->tail, element);
    GNUNET_PEER_change_rc (element->peer, -1);
    GNUNET_free(element);
  }

  tunnels->head = NULL;
  tunnels->tail = NULL;
}

static int
compare_list_tunnels (void *cls, struct GNUNET_MESSENGER_ListTunnel *element0,
                      struct GNUNET_MESSENGER_ListTunnel *element1)
{
  return ((int) element0->peer) - ((int) element1->peer);
}

void
add_to_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels, const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_MESSENGER_ListTunnel *element = GNUNET_new(struct GNUNET_MESSENGER_ListTunnel);

  element->peer = GNUNET_PEER_intern (peer);

  GNUNET_CONTAINER_DLL_insert_sorted(struct GNUNET_MESSENGER_ListTunnel, compare_list_tunnels, NULL, tunnels->head,
                                     tunnels->tail, element);
}

struct GNUNET_MESSENGER_ListTunnel*
find_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels, const struct GNUNET_PeerIdentity *peer, size_t *index)
{
  struct GNUNET_MESSENGER_ListTunnel *element;
  struct GNUNET_PeerIdentity pid;

  if (index)
    *index = 0;

  for (element = tunnels->head; element; element = element->next)
  {
    GNUNET_PEER_resolve (element->peer, &pid);

    if (0 == GNUNET_memcmp(&pid, peer))
      return element;

    if (index)
      (*index) = (*index) + 1;
  }

  return NULL;
}

int
contains_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels, const struct GNUNET_PeerIdentity *peer)
{
  return find_list_tunnels (tunnels, peer, NULL) != NULL ? GNUNET_YES : GNUNET_NO;
}

struct GNUNET_MESSENGER_ListTunnel*
remove_from_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels, struct GNUNET_MESSENGER_ListTunnel *element)
{
  struct GNUNET_MESSENGER_ListTunnel *next = element->next;

  GNUNET_CONTAINER_DLL_remove(tunnels->head, tunnels->tail, element);
  GNUNET_PEER_change_rc (element->peer, -1);
  GNUNET_free(element);

  return next;
}