/*
     This file is part of GNUnet.
     Copyright (C) 2011 Christian Grothoff (and other contributing authors)

     GNUnet 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, 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
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
*/
/**
 * @file ats/gnunet-service-ats.c
 * @brief ats service
 * @author Matthias Wachs
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet-service-ats.h"
#include "gnunet-service-ats_addresses.h"
#include "gnunet-service-ats_connectivity.h"
#include "gnunet-service-ats_feedback.h"
#include "gnunet-service-ats_normalization.h"
#include "gnunet-service-ats_performance.h"
#include "gnunet-service-ats_preferences.h"
#include "gnunet-service-ats_scheduling.h"
#include "gnunet-service-ats_reservations.h"
#include "gnunet-service-ats_plugins.h"
#include "ats.h"

/**
 * Handle for statistics.
 */
struct GNUNET_STATISTICS_Handle *GSA_stats;

/**
 * Handle to the ATS server.
 */
static struct GNUNET_SERVER_Handle *GSA_server;


/**
 * We have received a `struct ClientStartMessage` from a client.  Find
 * out which type of client it is and notify the respective subsystem.
 *
 * @param cls closure, unused
 * @param client handle to the client
 * @param message the start message
 */
static void
handle_ats_start (void *cls,
                  struct GNUNET_SERVER_Client *client,
                  const struct GNUNET_MessageHeader *message)
{
  const struct ClientStartMessage *msg =
      (const struct ClientStartMessage *) message;
  enum StartFlag flag;

  flag = ntohl (msg->start_flag);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received ATS_START (%d) message\n",
              (int) flag);
  switch (flag)
  {
  case START_FLAG_SCHEDULING:
    if (GNUNET_OK != GAS_scheduling_add_client (client))
    {
      GNUNET_SERVER_receive_done (client,
                                  GNUNET_SYSERR);
      return;
    }
    break;
  case START_FLAG_PERFORMANCE_WITH_PIC:
    GAS_performance_add_client (client,
                                flag);
    break;
  case START_FLAG_PERFORMANCE_NO_PIC:
    GAS_performance_add_client (client,
                                flag);
    break;
  case START_FLAG_CONNECTION_SUGGESTION:
    /* This client won't receive messages from us, no need to 'add' */
    break;
  default:
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client,
                                GNUNET_SYSERR);
    return;
  }
  GNUNET_SERVER_receive_done (client,
                              GNUNET_OK);
}


/**
 * A client disconnected from us.  Tear down the local client
 * record.
 *
 * @param cls unused
 * @param client handle of the client
 */
static void
client_disconnect_handler (void *cls,
                           struct GNUNET_SERVER_Client *client)
{
  if (NULL == client)
    return;
  GAS_scheduling_remove_client (client);
  GAS_connectivity_remove_client (client);
  GAS_preference_client_disconnect (client);
}


/**
 * Task run during shutdown.
 *
 * @param cls unused
 * @param tc unused
 */
static void
cleanup_task (void *cls,
              const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GAS_connectivity_done ();
  GAS_addresses_done ();
  GAS_plugin_done ();
  GAS_normalization_stop ();
  GAS_scheduling_done ();
  GAS_performance_done ();
  GAS_preference_done ();
  GAS_reservations_done ();
  GNUNET_SERVER_disconnect_notify_cancel (GSA_server,
                                          &client_disconnect_handler,
                                          NULL);
  if (NULL != GSA_stats)
  {
    GNUNET_STATISTICS_destroy (GSA_stats, GNUNET_NO);
    GSA_stats = NULL;
  }
}


/**
 * Process template requests.
 *
 * @param cls closure
 * @param server the initialized server
 * @param cfg configuration to use
 */
static void
run (void *cls,
     struct GNUNET_SERVER_Handle *server,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  static const struct GNUNET_SERVER_MessageHandler handlers[] = {
    {&handle_ats_start, NULL,
     GNUNET_MESSAGE_TYPE_ATS_START,
     sizeof (struct ClientStartMessage)},
    {&GAS_handle_request_address, NULL,
     GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS,
     sizeof (struct RequestAddressMessage)},
    {&GAS_handle_request_address_cancel, NULL,
     GNUNET_MESSAGE_TYPE_ATS_REQUEST_ADDRESS_CANCEL,
     sizeof (struct RequestAddressMessage)},
    {&GAS_handle_request_address_list, NULL,
     GNUNET_MESSAGE_TYPE_ATS_ADDRESSLIST_REQUEST,
     sizeof (struct AddressListRequestMessage)},
    {&GAS_handle_address_add, NULL,
     GNUNET_MESSAGE_TYPE_ATS_ADDRESS_ADD, 0},
    {&GAS_handle_address_update, NULL,
     GNUNET_MESSAGE_TYPE_ATS_ADDRESS_UPDATE,
     sizeof (struct AddressUpdateMessage) },
    {&GAS_handle_address_destroyed, NULL,
     GNUNET_MESSAGE_TYPE_ATS_ADDRESS_DESTROYED,
     sizeof (struct AddressDestroyedMessage) },
    {&GAS_handle_reservation_request, NULL,
     GNUNET_MESSAGE_TYPE_ATS_RESERVATION_REQUEST,
     sizeof (struct ReservationRequestMessage)},
    {&GAS_handle_preference_change, NULL,
     GNUNET_MESSAGE_TYPE_ATS_PREFERENCE_CHANGE, 0},
    {&GAS_handle_feedback, NULL,
     GNUNET_MESSAGE_TYPE_ATS_PREFERENCE_FEEDBACK, 0},
    {NULL, NULL, 0, 0}
  };
  GSA_server = server;
  GSA_stats = GNUNET_STATISTICS_create ("ats", cfg);
  GAS_reservations_init (server);
  GAS_connectivity_init ();
  GAS_preference_init ();
  GAS_normalization_start ();
  GAS_addresses_init (server);
  if (GNUNET_OK !=
      GAS_plugin_init (cfg))
  {
    GNUNET_break (0);
    GAS_addresses_done ();
    GAS_normalization_stop ();
    GAS_reservations_done ();
    GAS_connectivity_done ();
    GAS_preference_done ();
    if (NULL != GSA_stats)
    {
      GNUNET_STATISTICS_destroy (GSA_stats, GNUNET_NO);
      GSA_stats = NULL;
    }
    return;
  }
  GAS_performance_init (server);
  GAS_scheduling_init (server);

  GNUNET_SERVER_disconnect_notify (server,
                                   &client_disconnect_handler,
				   NULL);
  GNUNET_SERVER_add_handlers (server, handlers);
  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
                                &cleanup_task,
				NULL);
}


/**
 * The main function for the ats service.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  return (GNUNET_OK ==
          GNUNET_SERVICE_run (argc, argv, "ats",
                              GNUNET_SERVICE_OPTION_NONE,
                              &run, NULL)) ? 0 : 1;
}

/* end of gnunet-service-ats.c */