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/*
     This file is part of GNUnet.
     (C) 2009 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., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/
/**
 * @file nse/test_nse_multipeer.c
 *
 * @brief Testcase for the network size estimation service.  Starts
 *        a peergroup with a given number of peers, then waits to
 *        receive size estimates from each peer.  Expects to wait
 *        for one message from each peer.
 */
#include "platform.h"
#include "gnunet_testing_lib.h"
#include "gnunet_nse_service.h"

#define VERBOSE GNUNET_EXTRA_LOGGING

#define NUM_PEERS 4

struct NSEPeer
{
  struct NSEPeer *prev;

  struct NSEPeer *next;

  struct GNUNET_TESTING_Daemon *daemon;

  struct GNUNET_NSE_Handle *nse_handle;
};

struct NSEPeer *peer_head;

struct NSEPeer *peer_tail;

/**
 * How long do we run the test?
 */
#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 300)

static int ok;

static int peers_left;

static unsigned int num_peers;

static unsigned int total_connections;

static struct GNUNET_TESTING_PeerGroup *pg;

/**
 * Check whether peers successfully shut down.
 */
static void
shutdown_callback (void *cls, const char *emsg)
{
  if (emsg != NULL)
  {
#if VERBOSE
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Shutdown of peers failed: %s!\n",
                emsg);
#endif
    if (ok == 0)
      ok = 666;
  }
  else
  {
#if VERBOSE
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "All peers successfully shut down!\n");
#endif
    ok = 0;
  }
}

static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct NSEPeer *pos;

#if VERBOSE
  fprintf (stderr, "Ending test.\n");
#endif

  while (NULL != (pos = peer_head))
  {
    GNUNET_NSE_disconnect (pos->nse_handle);
    GNUNET_CONTAINER_DLL_remove (peer_head, peer_tail, pos);
    GNUNET_free (pos);
  }

  GNUNET_TESTING_daemons_stop (pg, TIMEOUT, &shutdown_callback, NULL);
}

/**
 * Callback to call when network size estimate is updated.
 *
 * @param cls closure
 * @param timestamp server timestamp
 * @param estimate the value of the current network size estimate
 * @param std_dev standard deviation (rounded down to nearest integer)
 *                of the size estimation values seen
 *
 */
static void
handle_estimate (void *cls, struct GNUNET_TIME_Absolute timestamp,
                 double estimate, double std_dev)
{
  struct NSEPeer *peer = cls;

  fprintf (stderr,
           "Received network size estimate from peer %s. logSize: %f std.dev. %f (%f/%u)\n",
           GNUNET_i2s (&peer->daemon->id), estimate, std_dev,
           GNUNET_NSE_log_estimate_to_n (estimate), num_peers);
}


static void
connect_nse_service (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct NSEPeer *current_peer;
  unsigned int i;

#if VERBOSE
  fprintf (stderr, "TEST_NSE_MULTIPEER: connecting to nse service of peers\n");
#endif
  for (i = 0; i < num_peers; i++)
  {
    current_peer = GNUNET_malloc (sizeof (struct NSEPeer));
    current_peer->daemon = GNUNET_TESTING_daemon_get (pg, i);
    current_peer->nse_handle =
        GNUNET_NSE_connect (current_peer->daemon->cfg, &handle_estimate,
                            current_peer);
    GNUNET_assert (current_peer->nse_handle != NULL);
    GNUNET_CONTAINER_DLL_insert (peer_head, peer_tail, current_peer);
  }
}


static void
my_cb (void *cls, const char *emsg)
{
  if (emsg != NULL)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Peergroup callback called with error, aborting test!\n");
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Error from testing: `%s'\n");
    ok = 1;
    GNUNET_TESTING_daemons_stop (pg, TIMEOUT, &shutdown_callback, NULL);
    return;
  }
#if VERBOSE
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Peer Group started successfully, connecting to NSE service for each peer!\n");
#endif
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Have %u connections\n",
              total_connections);

  GNUNET_SCHEDULER_add_now (&connect_nse_service, NULL);
}


/**
 * Function that will be called whenever
 * two daemons are connected by the testing library.
 *
 * @param cls closure
 * @param first peer id for first daemon
 * @param second peer id for the second daemon
 * @param distance distance between the connected peers
 * @param first_cfg config for the first daemon
 * @param second_cfg config for the second daemon
 * @param first_daemon handle for the first daemon
 * @param second_daemon handle for the second daemon
 * @param emsg error message (NULL on success)
 */
static void
connect_cb (void *cls, const struct GNUNET_PeerIdentity *first,
            const struct GNUNET_PeerIdentity *second, uint32_t distance,
            const struct GNUNET_CONFIGURATION_Handle *first_cfg,
            const struct GNUNET_CONFIGURATION_Handle *second_cfg,
            struct GNUNET_TESTING_Daemon *first_daemon,
            struct GNUNET_TESTING_Daemon *second_daemon, const char *emsg)
{
  if (emsg == NULL)
  {
    //fprintf(stderr, "Connected %s -> %s\n", GNUNET_i2s(first), second_id);
    total_connections++;
  }
}



static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_CONFIGURATION_Handle *testing_cfg;
  unsigned long long total_peers;

  ok = 1;
  testing_cfg = GNUNET_CONFIGURATION_create ();
  GNUNET_assert (GNUNET_OK == GNUNET_CONFIGURATION_load (testing_cfg, cfgfile));

#if VERBOSE
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting daemons.\n");
  GNUNET_CONFIGURATION_set_value_string (testing_cfg, "testing",
                                         "use_progressbars", "YES");
#endif
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_number (testing_cfg, "testing",
                                             "num_peers", &total_peers))
    total_peers = NUM_PEERS;

  peers_left = total_peers;
  num_peers = peers_left;
  pg = GNUNET_TESTING_peergroup_start (testing_cfg, peers_left, TIMEOUT,
                                       &connect_cb, &my_cb, NULL, NULL);
  GNUNET_assert (pg != NULL);
  GNUNET_SCHEDULER_add_delayed (TIMEOUT, &shutdown_task, NULL);
}


static int
check ()
{
  char *const argv[] = { "test-nse-multipeer",
    "-c",
    "test_nse.conf",
#if VERBOSE
    "-L", "DEBUG",
#endif
    NULL
  };
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_END
  };
  GNUNET_PROGRAM_run ((sizeof (argv) / sizeof (char *)) - 1, argv,
                      "test-nse-multipeer", "nohelp", options, &run, &ok);
  return ok;
}


int
main (int argc, char *argv[])
{
  int ret;

  GNUNET_log_setup ("test-nse-multipeer",
#if VERBOSE
                    "DEBUG",
#else
                    "WARNING",
#endif
                    NULL);
  ret = check ();
  // GNUNET_DISK_directory_remove ("/tmp/test-nse-multipeer");
  return ret;
}

/* end of test_nse_multipeer.c */