/*
     This file is part of GNUnet.
     Copyright (C) 2012, 2016 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
 */

/**
 * @file set/test_set_union_result_smmetric
 * @brief testcase for symmetric result mode of the union set operation
 * @author Florian Dold
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_lib.h"
#include "gnunet_set_service.h"


/**
 * Value to return from #main().
 */
static int ret;

static struct GNUNET_PeerIdentity local_id;

static struct GNUNET_HashCode app_id;

static struct GNUNET_SET_Handle *set1;

static struct GNUNET_SET_Handle *set2;

static struct GNUNET_SET_ListenHandle *listen_handle;

static const struct GNUNET_CONFIGURATION_Handle *config;

static struct GNUNET_SET_OperationHandle *oh1;

static struct GNUNET_SET_OperationHandle *oh2;

static int iter_count;

/**
 * Are we testing correctness for the empty set union?
 */
static int empty;

/**
 * Number of elements found in set 1
 */
static unsigned int count_set1;

/**
 * Number of elements found in set 2
 */
static unsigned int count_set2;

/**
 * Task that is run when the test times out.
 */
static struct GNUNET_SCHEDULER_Task *timeout_task;


static void
result_cb_set1(void *cls,
               const struct GNUNET_SET_Element *element,
               uint64_t current_size,
               enum GNUNET_SET_Status status)
{
  switch (status)
    {
    case GNUNET_SET_STATUS_ADD_LOCAL:
      count_set1++;
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 1: got element\n");
      break;

    case GNUNET_SET_STATUS_FAILURE:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 1: failure\n");
      oh1 = NULL;
      ret = 1;
      if (NULL != timeout_task)
        {
          GNUNET_SCHEDULER_cancel(timeout_task);
          timeout_task = NULL;
        }
      GNUNET_SCHEDULER_shutdown();
      break;

    case GNUNET_SET_STATUS_DONE:
      oh1 = NULL;
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 1: done\n");
      GNUNET_SET_destroy(set1);
      set1 = NULL;
      if (NULL == set2)
        {
          if (NULL != timeout_task)
            {
              GNUNET_SCHEDULER_cancel(timeout_task);
              timeout_task = NULL;
            }
          GNUNET_SCHEDULER_shutdown();
        }
      break;

    case GNUNET_SET_STATUS_ADD_REMOTE:
      break;

    default:
      GNUNET_assert(0);
    }
}


static void
result_cb_set2(void *cls,
               const struct GNUNET_SET_Element *element,
               uint64_t current_size,
               enum GNUNET_SET_Status status)
{
  switch (status)
    {
    case GNUNET_SET_STATUS_ADD_LOCAL:
      count_set2++;
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 2: got element\n");
      break;

    case GNUNET_SET_STATUS_FAILURE:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 2: failure\n");
      oh2 = NULL;
      ret = 1;
      if (NULL != timeout_task)
        {
          GNUNET_SCHEDULER_cancel(timeout_task);
          timeout_task = NULL;
        }
      GNUNET_SCHEDULER_shutdown();
      break;

    case GNUNET_SET_STATUS_DONE:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
                 "set 2: done\n");
      oh2 = NULL;
      GNUNET_SET_destroy(set2);
      set2 = NULL;
      if (NULL == set1)
        {
          if (NULL != timeout_task)
            {
              GNUNET_SCHEDULER_cancel(timeout_task);
              timeout_task = NULL;
            }
          GNUNET_SCHEDULER_shutdown();
        }
      break;

    case GNUNET_SET_STATUS_ADD_REMOTE:
      break;

    default:
      GNUNET_assert(0);
    }
}


static void
listen_cb(void *cls,
          const struct GNUNET_PeerIdentity *other_peer,
          const struct GNUNET_MessageHeader *context_msg,
          struct GNUNET_SET_Request *request)
{
  GNUNET_assert(NULL != context_msg);
  GNUNET_assert(ntohs(context_msg->type) == GNUNET_MESSAGE_TYPE_DUMMY);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "listen cb called\n");
  oh2 = GNUNET_SET_accept(request,
                          GNUNET_SET_RESULT_SYMMETRIC,
                          (struct GNUNET_SET_Option[]) { 0 },
                          &result_cb_set2,
                          NULL);
  GNUNET_SET_commit(oh2,
                    set2);
}


/**
 * Start the set operation.
 *
 * @param cls closure, unused
 */
static void
start(void *cls)
{
  struct GNUNET_MessageHeader context_msg;

  context_msg.size = htons(sizeof context_msg);
  context_msg.type = htons(GNUNET_MESSAGE_TYPE_DUMMY);

  listen_handle = GNUNET_SET_listen(config,
                                    GNUNET_SET_OPERATION_UNION,
                                    &app_id,
                                    &listen_cb, NULL);
  oh1 = GNUNET_SET_prepare(&local_id,
                           &app_id,
                           &context_msg,
                           GNUNET_SET_RESULT_SYMMETRIC,
                           (struct GNUNET_SET_Option[]) { 0 },
                           &result_cb_set1, NULL);
  GNUNET_SET_commit(oh1, set1);
}


/**
 * Initialize the second set, continue
 *
 * @param cls closure, unused
 */
static void
init_set2(void *cls)
{
  struct GNUNET_SET_Element element;

  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "initializing set 2\n");
  if (empty)
    {
      start(NULL);
      return;
    }
  element.element_type = 0;
  element.data = "hello";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(set2,
                         &element,
                         NULL,
                         NULL);
  element.data = "quux";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(set2,
                         &element,
                         NULL,
                         NULL);
  element.data = "baz";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(set2,
                         &element,
                         &start, NULL);
}


/**
 * Initialize the first set, continue.
 */
static void
init_set1(void)
{
  struct GNUNET_SET_Element element;

  if (empty)
    {
      init_set2(NULL);
      return;
    }
  element.element_type = 0;
  element.data = "hello";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(set1,
                         &element,
                         NULL,
                         NULL);
  element.data = "bar";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(set1,
                         &element,
                         &init_set2,
                         NULL);
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "initialized set 1\n");
}


static int
iter_cb(void *cls,
        const struct GNUNET_SET_Element *element)
{
  if (NULL == element)
    {
      GNUNET_assert(iter_count == 3);
      GNUNET_SET_destroy(cls);
      return GNUNET_YES;
    }
  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
             "iter: got element\n");
  iter_count++;
  return GNUNET_YES;
}


static void
test_iter()
{
  struct GNUNET_SET_Element element;
  struct GNUNET_SET_Handle *iter_set;

  iter_count = 0;
  iter_set = GNUNET_SET_create(config, GNUNET_SET_OPERATION_UNION);
  element.element_type = 0;
  element.data = "hello";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(iter_set, &element, NULL, NULL);
  element.data = "bar";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(iter_set, &element, NULL, NULL);
  element.data = "quux";
  element.size = strlen(element.data);
  GNUNET_SET_add_element(iter_set, &element, NULL, NULL);

  GNUNET_SET_iterate(iter_set,
                     &iter_cb,
                     iter_set);
}


/**
 * Signature of the main function of a task.
 *
 * @param cls closure
 */
static void
timeout_fail(void *cls)
{
  timeout_task = NULL;
  GNUNET_SCHEDULER_shutdown();
  GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
             "test timed out\n");
  ret = 1;
}


/**
 * Function run on shutdown.
 *
 * @param cls closure
 */
static void
do_shutdown(void *cls)
{
  if (NULL != timeout_task)
    {
      GNUNET_SCHEDULER_cancel(timeout_task);
      timeout_task = NULL;
    }
  if (NULL != oh1)
    {
      GNUNET_SET_operation_cancel(oh1);
      oh1 = NULL;
    }
  if (NULL != oh2)
    {
      GNUNET_SET_operation_cancel(oh2);
      oh2 = NULL;
    }
  if (NULL != set1)
    {
      GNUNET_SET_destroy(set1);
      set1 = NULL;
    }
  if (NULL != set2)
    {
      GNUNET_SET_destroy(set2);
      set2 = NULL;
    }
  if (NULL != listen_handle)
    {
      GNUNET_SET_listen_cancel(listen_handle);
      listen_handle = NULL;
    }
}


/**
 * Signature of the 'main' function for a (single-peer) testcase that
 * is run using 'GNUNET_TESTING_peer_run'.
 *
 * @param cls closure
 * @param cfg configuration of the peer that was started
 * @param peer identity of the peer that was created
 */
static void
run(void *cls,
    const struct GNUNET_CONFIGURATION_Handle *cfg,
    struct GNUNET_TESTING_Peer *peer)
{
  timeout_task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5),
                                              &timeout_fail,
                                              NULL);
  GNUNET_SCHEDULER_add_shutdown(&do_shutdown,
                                NULL);
  config = cfg;
  GNUNET_TESTING_peer_get_identity(peer,
                                   &local_id);

  if (0)
    test_iter();

  set1 = GNUNET_SET_create(cfg, GNUNET_SET_OPERATION_UNION);
  set2 = GNUNET_SET_create(cfg, GNUNET_SET_OPERATION_UNION);
  GNUNET_CRYPTO_hash_create_random(GNUNET_CRYPTO_QUALITY_WEAK, &app_id);

  /* test the real set reconciliation */
  init_set1();
}


int
main(int argc, char **argv)
{
  empty = 1;
  if (0 != GNUNET_TESTING_peer_run("test_set_api",
                                   "test_set.conf",
                                   &run, NULL))
    {
      return 1;
    }
  GNUNET_assert(0 == count_set1);
  GNUNET_assert(0 == count_set2);
  empty = 0;
  if (0 != GNUNET_TESTING_peer_run("test_set_api",
                                   "test_set.conf",
                                   &run, NULL))
    {
      return 1;
    }
  GNUNET_break(2 == count_set1);
  GNUNET_break(1 == count_set2);
  return ret;
}