/*
     This file is part of GNUnet.
     Copyright (C) 2009, 2010, 2015, 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 core/test_core_api.c
 * @brief testcase for core_api.c
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_arm_service.h"
#include "gnunet_core_service.h"
#include "gnunet_util_lib.h"
#include "gnunet_transport_service.h"
#include "gnunet_transport_hello_service.h"
#include "gnunet_ats_service.h"

#define MTYPE 12345

struct PeerContext
{
  struct GNUNET_CONFIGURATION_Handle *cfg;
  struct GNUNET_CORE_Handle *ch;
  struct GNUNET_PeerIdentity id;
  struct GNUNET_TRANSPORT_OfferHelloHandle *oh;
  struct GNUNET_TRANSPORT_HelloGetHandle *ghh;
  struct GNUNET_ATS_ConnectivityHandle *ats;
  struct GNUNET_ATS_ConnectivitySuggestHandle *ats_sh;
  struct GNUNET_MessageHeader *hello;
  int connect_status;
  struct GNUNET_OS_Process *arm_proc;
};

static struct PeerContext p1;

static struct PeerContext p2;

static struct GNUNET_SCHEDULER_Task *err_task;

static int ok;

#define OKPP                                  \
  do                                          \
  {                                           \
    ok++;                                     \
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,      \
                "Now at stage %u at %s:%u\n", \
                ok,                           \
                __FILE__,                     \
                __LINE__);                    \
  } while (0)


static void
offer_hello_done (void *cls)
{
  struct PeerContext *p = cls;

  p->oh = NULL;
}


static void
process_hello (void *cls, const struct GNUNET_MessageHeader *message)
{
  struct PeerContext *p = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received (my) HELLO from transport service\n");
  GNUNET_assert (message != NULL);
  if ((p == &p1) && (NULL == p2.oh))
    p2.oh =
      GNUNET_TRANSPORT_offer_hello (p2.cfg, message, &offer_hello_done, &p2);
  if ((p == &p2) && (NULL == p1.oh))
    p1.oh =
      GNUNET_TRANSPORT_offer_hello (p1.cfg, message, &offer_hello_done, &p1);
}


static void
terminate_peer (struct PeerContext *p)
{
  if (NULL != p->ch)
  {
    GNUNET_CORE_disconnect (p->ch);
    p->ch = NULL;
  }
  if (NULL != p->ghh)
  {
    GNUNET_TRANSPORT_hello_get_cancel (p->ghh);
    p->ghh = NULL;
  }
  if (NULL != p->oh)
  {
    GNUNET_TRANSPORT_offer_hello_cancel (p->oh);
    p->oh = NULL;
  }
  if (NULL != p->ats_sh)
  {
    GNUNET_ATS_connectivity_suggest_cancel (p->ats_sh);
    p->ats_sh = NULL;
  }
  if (NULL != p->ats)
  {
    GNUNET_ATS_connectivity_done (p->ats);
    p->ats = NULL;
  }
}


static void
terminate_task (void *cls)
{
  GNUNET_assert (ok == 6);
  terminate_peer (&p1);
  terminate_peer (&p2);
  ok = 0;
}


static void
terminate_task_error (void *cls)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ENDING ANGRILY %u\n", ok);
  GNUNET_break (0);
  terminate_peer (&p1);
  terminate_peer (&p2);
  ok = 42;
}


static void *
connect_notify (void *cls,
                const struct GNUNET_PeerIdentity *peer,
                struct GNUNET_MQ_Handle *mq)
{
  struct PeerContext *pc = cls;
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_MessageHeader *msg;

  if (0 == memcmp (&pc->id, peer, sizeof(struct GNUNET_PeerIdentity)))
    return (void *) peer;
  GNUNET_assert (pc->connect_status == 0);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Encrypted connection established to peer `%s'\n",
              GNUNET_i2s (peer));
  pc->connect_status = 1;
  if (pc == &p1)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Asking core (1) for transmission to peer `%s'\n",
                GNUNET_i2s (&p2.id));
    env = GNUNET_MQ_msg (msg, MTYPE);
    /* enable corking for this test */
    GNUNET_MQ_env_set_options (env,
                               GNUNET_MQ_PRIO_BEST_EFFORT
                               | GNUNET_MQ_PREF_CORK_ALLOWED);
    /* now actually transmit message */
    GNUNET_assert (ok == 4);
    OKPP;
    GNUNET_MQ_send (mq, env);
  }
  return (void *) peer;
}


static void
disconnect_notify (void *cls,
                   const struct GNUNET_PeerIdentity *peer,
                   void *internal_cls)
{
  struct PeerContext *pc = cls;

  if (0 == memcmp (&pc->id, peer, sizeof(struct GNUNET_PeerIdentity)))
    return;
  pc->connect_status = 0;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Encrypted connection to `%s' cut\n",
              GNUNET_i2s (peer));
}


static void
handle_test (void *cls, const struct GNUNET_MessageHeader *message)
{
  const struct GNUNET_PeerIdentity *peer = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Receiving message from `%s'.\n",
              GNUNET_i2s (peer));
  GNUNET_assert (ok == 5);
  OKPP;
  GNUNET_SCHEDULER_cancel (err_task);
  err_task = GNUNET_SCHEDULER_add_now (&terminate_task, NULL);
}


static void
init_notify (void *cls, const struct GNUNET_PeerIdentity *my_identity)
{
  struct PeerContext *p = cls;
  struct GNUNET_MQ_MessageHandler handlers[] =
  { GNUNET_MQ_hd_fixed_size (test, MTYPE, struct GNUNET_MessageHeader, NULL),
    GNUNET_MQ_handler_end () };

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Core connection to `%s' established\n",
              GNUNET_i2s (my_identity));
  p->id = *my_identity;
  if (cls == &p1)
  {
    GNUNET_assert (ok == 2);
    OKPP;
    /* connect p2 */
    p2.ch = GNUNET_CORE_connect (p2.cfg,
                                 &p2,
                                 &init_notify,
                                 &connect_notify,
                                 &disconnect_notify,
                                 handlers);
  }
  else
  {
    GNUNET_assert (ok == 3);
    OKPP;
    GNUNET_assert (cls == &p2);
    p1.ats_sh = GNUNET_ATS_connectivity_suggest (p1.ats, &p2.id, 1);
  }
}


static void
setup_peer (struct PeerContext *p, const char *cfgname)
{
  char *binary;

  binary = GNUNET_OS_get_libexec_binary_path ("gnunet-service-arm");
  p->cfg = GNUNET_CONFIGURATION_create ();
  p->arm_proc = GNUNET_OS_start_process (GNUNET_OS_INHERIT_STD_OUT_AND_ERR
                                         | GNUNET_OS_USE_PIPE_CONTROL,
                                         NULL,
                                         NULL,
                                         NULL,
                                         binary,
                                         "gnunet-service-arm",
                                         "-c",
                                         cfgname,
                                         NULL);
  GNUNET_assert (GNUNET_OK == GNUNET_CONFIGURATION_load (p->cfg, cfgname));
  p->ats = GNUNET_ATS_connectivity_init (p->cfg);
  GNUNET_assert (NULL != p->ats);
  p->ghh = GNUNET_TRANSPORT_hello_get (p->cfg,
                                       GNUNET_TRANSPORT_AC_ANY,
                                       &process_hello,
                                       p);
  GNUNET_free (binary);
}


static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_MQ_MessageHandler handlers[] =
  { GNUNET_MQ_hd_fixed_size (test, MTYPE, struct GNUNET_MessageHeader, NULL),
    GNUNET_MQ_handler_end () };

  GNUNET_assert (ok == 1);
  OKPP;
  setup_peer (&p1, "test_core_api_peer1.conf");
  setup_peer (&p2, "test_core_api_peer2.conf");
  err_task = GNUNET_SCHEDULER_add_delayed (
    GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 300),
    &terminate_task_error,
    NULL);
  p1.ch = GNUNET_CORE_connect (p1.cfg,
                               &p1,
                               &init_notify,
                               &connect_notify,
                               &disconnect_notify,
                               handlers);
}


static void
stop_arm (struct PeerContext *p)
{
  if (0 != GNUNET_OS_process_kill (p->arm_proc, GNUNET_TERM_SIG))
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
  if (GNUNET_OK != GNUNET_OS_process_wait (p->arm_proc))
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "waitpid");
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "ARM process %u stopped\n",
              GNUNET_OS_process_get_pid (p->arm_proc));
  GNUNET_OS_process_destroy (p->arm_proc);
  p->arm_proc = NULL;
  GNUNET_CONFIGURATION_destroy (p->cfg);
}


int
main (int argc, char *argv1[])
{
  char *const argv[] = { "test-core-api", "-c", "test_core_api_data.conf",
                         NULL };
  struct GNUNET_GETOPT_CommandLineOption options[] =
  { GNUNET_GETOPT_OPTION_END };

  ok = 1;
  GNUNET_log_setup ("test-core-api", "WARNING", NULL);
  GNUNET_PROGRAM_run ((sizeof(argv) / sizeof(char *)) - 1,
                      argv,
                      "test-core-api",
                      "nohelp",
                      options,
                      &run,
                      &ok);
  stop_arm (&p1);
  stop_arm (&p2);
  GNUNET_DISK_purge_cfg_dir 
      ("test_core_api_peer1.conf", 
       "GNUNET_TEST_HOME");
  GNUNET_DISK_purge_cfg_dir 
      ("test_core_api_peer2.conf", 
       "GNUNET_TEST_HOME");

  return ok;
}


/* end of test_core_api.c */
