/*
     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 dht/test_dht_api.c
 * @brief base test case for dht api
 *
 * This test case tests DHT api to DUMMY DHT service communication.
 *
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_hello_lib.h"
#include "gnunet_testing_lib.h"
#include "gnunet_dht_service.h"


/**
 * How long until we really give up on a particular testcase portion?
 */
#define TOTAL_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 600)

/**
 * How long until we give up on any particular operation (and retry)?
 */
#define BASE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)

#define MTYPE 12345


struct RetryContext
{
  /**
   * When to really abort the operation.
   */
  struct GNUNET_TIME_Absolute real_timeout;

  /**
   * What timeout to set for the current attempt (increases)
   */
  struct GNUNET_TIME_Relative next_timeout;

  /**
   * The task identifier of the retry task, so it can be cancelled.
   */
  GNUNET_SCHEDULER_TaskIdentifier retry_task;

};


static struct GNUNET_DHT_Handle *dht_handle;

static struct GNUNET_DHT_GetHandle *get_handle;

struct RetryContext retry_context;

static int ok = 1;

static GNUNET_SCHEDULER_TaskIdentifier die_task;


#if VERBOSE
#define OKPP do { ok++; FPRINTF (stderr, "Now at stage %u at %s:%u\n", ok, __FILE__, __LINE__); } while (0)
#else
#define OKPP do { ok++; } while (0)
#endif


static void
end (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GNUNET_SCHEDULER_cancel (die_task);
  die_task = GNUNET_SCHEDULER_NO_TASK;
  GNUNET_DHT_disconnect (dht_handle);
  dht_handle = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "DHT disconnected, returning success!\n");
  ok = 0;
}


static void
end_badly ()
{
  /* do work here */
  FPRINTF (stderr, "%s",  "Ending on an unhappy note.\n");
  if (get_handle != NULL)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Stopping get request!\n");
    GNUNET_DHT_get_stop (get_handle);
  }
  if (retry_context.retry_task != GNUNET_SCHEDULER_NO_TASK)
    GNUNET_SCHEDULER_cancel (retry_context.retry_task);
  GNUNET_DHT_disconnect (dht_handle);
  dht_handle = NULL;
  ok = 1;
}


/**
 * Signature of the main function of a task.
 *
 * @param cls closure
 * @param tc context information (why was this task triggered now)
 */
static void
test_get_stop (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Called test_get_stop!\n");
  if ((tc->reason & GNUNET_SCHEDULER_REASON_TIMEOUT) != 0)
  {
    GNUNET_break (0);
    GNUNET_SCHEDULER_cancel (die_task);
    die_task = GNUNET_SCHEDULER_add_now (&end_badly, NULL);
    return;
  }
  GNUNET_assert (dht_handle != NULL);
  GNUNET_DHT_get_stop (get_handle);
  get_handle = NULL;
  GNUNET_SCHEDULER_add_now (&end, NULL);
}


static void
test_get_iterator (void *cls, struct GNUNET_TIME_Absolute exp,
                   const struct GNUNET_HashCode * key,
                   const struct GNUNET_PeerIdentity *get_path,
                   unsigned int get_path_length,
                   const struct GNUNET_PeerIdentity *put_path,
                   unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
                   size_t size, const void *data)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "test_get_iterator called (we got a result), stopping get request!\n");
  GNUNET_SCHEDULER_add_continuation (&test_get_stop, NULL,
                                     GNUNET_SCHEDULER_REASON_PREREQ_DONE);
}


/**
 * Signature of the main function of a task.
 *
 * @param cls closure
 * @param success result of PUT
 */
static void
test_get (void *cls, int success)
{
  struct GNUNET_HashCode hash;

  memset (&hash, 42, sizeof (struct GNUNET_HashCode));

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Called test_get!\n");
  GNUNET_assert (dht_handle != NULL);
  retry_context.real_timeout = GNUNET_TIME_relative_to_absolute (TOTAL_TIMEOUT);
  retry_context.next_timeout = BASE_TIMEOUT;

  get_handle =
      GNUNET_DHT_get_start (dht_handle,
                            GNUNET_BLOCK_TYPE_TEST, &hash, 1,
                            GNUNET_DHT_RO_NONE, NULL, 0, &test_get_iterator,
                            NULL);

  if (get_handle == NULL)
  {
    GNUNET_break (0);
    GNUNET_SCHEDULER_cancel (die_task);
    die_task = GNUNET_SCHEDULER_add_now (&end_badly, NULL);
    return;
  }
}


static void
run (void *cls,
     const struct GNUNET_CONFIGURATION_Handle *cfg,
     struct GNUNET_TESTING_Peer *peer)
{
  struct GNUNET_HashCode hash;
  char *data;
  size_t data_size = 42;

  GNUNET_assert (ok == 1);
  OKPP;
  die_task =
      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
                                    (GNUNET_TIME_UNIT_MINUTES, 1), &end_badly,
                                    NULL);


  memset (&hash, 42, sizeof (struct GNUNET_HashCode));
  data = GNUNET_malloc (data_size);
  memset (data, 43, data_size);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Called test_put!\n");
  dht_handle = GNUNET_DHT_connect (cfg, 100);
  GNUNET_assert (dht_handle != NULL);
  GNUNET_DHT_put (dht_handle, &hash, 1, GNUNET_DHT_RO_NONE,
                  GNUNET_BLOCK_TYPE_TEST, data_size, data,
                  GNUNET_TIME_relative_to_absolute (TOTAL_TIMEOUT),
                  TOTAL_TIMEOUT, &test_get, NULL);
  GNUNET_free (data);
}


int
main (int argc, char *argv[])
{
  if (0 != GNUNET_TESTING_peer_run ("test-dht-api",
				    "test_dht_api_data.conf",
				    &run, NULL))
    return 1;
  return ok;
}

/* end of test_dht_api.c */