/*
 * This file is part of GNUnet
 * Copyright (C) 2013 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 multicast/test_multicast_multipeers.c
 * @brief Tests for the Multicast API with multiple peers.
 * @author xrs
 */

#include <inttypes.h>

#include <gnunet/platform.h>
#include <gnunet/gnunet_crypto_lib.h>
#include <gnunet/gnunet_common.h>
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_testbed_service.h>
#include "gnunet_multicast_service.h"

#define PEERS_REQUESTED 12

struct MulticastPeerContext
{
  int peer; /* peer number */
  struct GNUNET_CRYPTO_EcdsaPrivateKey *key;
  const struct GNUNET_PeerIdentity *id;
  struct GNUNET_TESTBED_Operation *op; /* not yet in use */
  struct GNUNET_TESTBED_Operation *pi_op; /* not yet in use */
  int test_ok;
};

enum pingpong
{
  PING = 1,
  PONG = 2
};

struct pingpong_msg
{
  int peer;
  enum pingpong msg;
};

static void service_connect (void *cls,
                             struct GNUNET_TESTBED_Operation *op,
                             void *ca_result,
                             const char *emsg);

static struct MulticastPeerContext **multicast_peers;
static struct GNUNET_TESTBED_Peer **peers;

static struct GNUNET_TESTBED_Operation *op[PEERS_REQUESTED];
static struct GNUNET_TESTBED_Operation *pi_op[PEERS_REQUESTED];

static struct GNUNET_MULTICAST_Origin *origin;
static struct GNUNET_MULTICAST_Member *members[PEERS_REQUESTED]; /* first element always empty */

static struct GNUNET_SCHEDULER_Task *timeout_tid;

static struct GNUNET_CRYPTO_EddsaPrivateKey *group_key;
static struct GNUNET_CRYPTO_EddsaPublicKey group_pub_key;
static struct GNUNET_HashCode group_pub_key_hash;

/**
 * Global result for testcase.
 */
static int result;

/**
 * Function run on CTRL-C or shutdown (i.e. success/timeout/etc.).
 * Cleans up.
 */
static void
shutdown_task (void *cls)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "shutdown_task!\n");
  for (int i=0;i<PEERS_REQUESTED;i++)
  {
    if (NULL != op[i])
    {
      GNUNET_TESTBED_operation_done(op[i]);
      op[i] = NULL;
    }
    if (NULL != pi_op[i])
    {
      GNUNET_TESTBED_operation_done (pi_op[i]);
      pi_op[i] = NULL;
    }
  }

  if (NULL != multicast_peers)
  {
    for (int i=0; i < PEERS_REQUESTED; i++)
    {
      GNUNET_free_non_null (multicast_peers[i]->key);
      GNUNET_free (multicast_peers[i]);
      multicast_peers[i] = NULL;
    }
    GNUNET_free (multicast_peers);
    multicast_peers = NULL;
  }

  if (NULL != timeout_tid)
  {
    GNUNET_SCHEDULER_cancel (timeout_tid);
    timeout_tid = NULL;
  }
}


static void
timeout_task (void *cls)
{
  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
	      "Timeout!\n");
  result = GNUNET_SYSERR;
  GNUNET_SCHEDULER_shutdown ();
}


static void
member_join_request (void *cls,
                     const struct GNUNET_CRYPTO_EcdsaPublicKey *member_pub_key,
                     const struct GNUNET_MessageHeader *join_msg,
                     struct GNUNET_MULTICAST_JoinHandle *jh)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Peer #%u (%s) sent a join request.\n",
              mc_peer->peer,
              GNUNET_i2s (multicast_peers[mc_peer->peer]->id));
}


static int
notify (void *cls,
        size_t *data_size,
        void *data)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;

  struct pingpong_msg *pp_msg = GNUNET_new (struct pingpong_msg);
  pp_msg->peer = mc_peer->peer;
  pp_msg->msg = PING;

  *data_size = sizeof (struct pingpong_msg);
  GNUNET_memcpy(data, pp_msg, *data_size);
  GNUNET_free (pp_msg);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Peer #%u sents ping to origin\n", mc_peer->peer);

  return GNUNET_YES;
}


static void
member_join_decision (void *cls,
                      int is_admitted,
                      const struct GNUNET_PeerIdentity *peer,
                      uint16_t relay_count,
                      const struct GNUNET_PeerIdentity *relays,
                      const struct GNUNET_MessageHeader *join_msg)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Peer #%u (%s) received a decision from origin: %s\n",
              mc_peer->peer,
              GNUNET_i2s (multicast_peers[mc_peer->peer]->id),
              (GNUNET_YES == is_admitted)?"accepted":"rejected");

  if (GNUNET_YES == is_admitted)
  {
    GNUNET_MULTICAST_member_to_origin (members[mc_peer->peer],
                                       0,
                                       notify,
                                       cls);

  }
}


static void
member_replay_frag ()
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "member replay frag...\n");
}


static void
member_replay_msg ()
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "member replay msg...\n");
}


static void
origin_disconnected_cb (void *cls)
{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Origin disconnected. Shutting down.\n");
  result = GNUNET_YES;
  GNUNET_SCHEDULER_shutdown ();
}


static void
member_disconnected_cb (void *cls)
{
  for (int i = 1; i < PEERS_REQUESTED; ++i)
    if (GNUNET_NO == multicast_peers[i]->test_ok)
      return;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "All member disconnected. Stopping origin.\n");
  GNUNET_MULTICAST_origin_stop (origin, origin_disconnected_cb, cls);
}


static void
member_message (void *cls,
                const struct GNUNET_MULTICAST_MessageHeader *msg)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;
  struct pingpong_msg *pp_msg = (struct pingpong_msg*) &(msg[1]);

  if (PONG == pp_msg->msg && mc_peer->peer == pp_msg->peer)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "peer #%i (%s) receives a pong\n",
                mc_peer->peer,
                GNUNET_i2s (multicast_peers[mc_peer->peer]->id));
    mc_peer->test_ok = GNUNET_OK;
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "peer #%u (%s) parting from multicast group\n",
                mc_peer->peer,
                GNUNET_i2s (multicast_peers[mc_peer->peer]->id));

    GNUNET_MULTICAST_member_part (members[mc_peer->peer], member_disconnected_cb, cls);
  }
}


static void
origin_join_request (void *cls,
                 const struct GNUNET_CRYPTO_EcdsaPublicKey *member_pub_key,
                 const struct GNUNET_MessageHeader *join_msg,
                 struct GNUNET_MULTICAST_JoinHandle *jh)
{
  struct GNUNET_MessageHeader *join_resp;

  uint8_t data_size = ntohs (join_msg->size);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "origin got a join request...\n");
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "origin receives: '%s'\n", (char *)&join_msg[1]);

  char data[] = "Come in!";
  data_size = strlen (data) + 1;
  join_resp = GNUNET_malloc (sizeof (join_resp) + data_size);
  join_resp->size = htons (sizeof (join_resp) + data_size);
  join_resp->type = htons (123);
  GNUNET_memcpy (&join_resp[1], data, data_size);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "origin sends: '%s'\n", data);

  GNUNET_MULTICAST_join_decision (jh,
                                  GNUNET_YES,
                                  0,
                                  NULL,
                                  join_resp);

  result = GNUNET_OK;
}


static void
origin_replay_frag (void *cls,
                    const struct GNUNET_CRYPTO_EcdsaPublicKey *member_pub_key,
                    uint64_t fragment_id,
                    uint64_t flags,
                    struct GNUNET_MULTICAST_ReplayHandle *rh)
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "origin replay fraq msg\n");
}


static void
origin_replay_msg (void *cls,
                   const struct GNUNET_CRYPTO_EcdsaPublicKey *member_pub_key,
                   uint64_t message_id,
                   uint64_t fragment_offset,
                   uint64_t flags,
                   struct GNUNET_MULTICAST_ReplayHandle *rh)
{

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "origin replay msg\n");
}


static int
origin_notify (void *cls,
               size_t *data_size,
               void *data)
{
  struct pingpong_msg *rcv_pp_msg = (struct pingpong_msg*)cls;
  struct pingpong_msg *pp_msg = GNUNET_new (struct pingpong_msg);

  pp_msg->peer = rcv_pp_msg->peer;
  pp_msg->msg = PONG;
  *data_size = sizeof (struct pingpong_msg);
  GNUNET_memcpy(data, pp_msg, *data_size);
  GNUNET_free (pp_msg);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "origin sends pong\n");

  return GNUNET_YES;
}


static void
origin_request (void *cls,
                const struct GNUNET_MULTICAST_RequestHeader *req)
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "origin receives a msg\n");

  req++;
  struct pingpong_msg *pp_msg = (struct pingpong_msg *) req;

  if (1 != pp_msg->msg) {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "origin didn't reveice a correct request");
  }

  GNUNET_MULTICAST_origin_to_all (origin,
                                  0,
                                  0,
                                  origin_notify,
                                  pp_msg);
}


static void
origin_message (void *cls,
                const struct GNUNET_MULTICAST_MessageHeader *msg)
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "origin message msg\n");
}


static void
multicast_disconnect (void *cls,
                      void *op_result)
{

}


static void *
multicast_connect (void *cls,
                   const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct MulticastPeerContext *multicast_peer = cls;
  struct GNUNET_MessageHeader *join_msg;
  char data[64];

  if (0 == multicast_peer->peer)
  {
    group_key = GNUNET_CRYPTO_eddsa_key_create ();
    GNUNET_CRYPTO_eddsa_key_get_public (group_key, &group_pub_key);

    GNUNET_CRYPTO_hash (&group_pub_key, sizeof (group_pub_key), &group_pub_key_hash);
    origin = GNUNET_MULTICAST_origin_start (cfg,
                                            group_key,
                                            0,
                                            origin_join_request,
                                            origin_replay_frag,
                                            origin_replay_msg,
                                            origin_request,
                                            origin_message,
                                            cls);
    if (NULL == origin)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Peer #%u could not create a multicast group",
                  multicast_peer->peer);
      return NULL;
    }
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Peer #%u connected as origin to group %s\n",
                multicast_peer->peer,
                GNUNET_h2s (&group_pub_key_hash));
    return origin;
  }
  else
  {
    multicast_peer->key = GNUNET_CRYPTO_ecdsa_key_create ();

    sprintf(data, "Hi, I am peer #%u (%s). Can I enter?",
            multicast_peer->peer,
            GNUNET_i2s (multicast_peers[multicast_peer->peer]->id));
    uint8_t data_size = strlen (data) + 1;
    join_msg = GNUNET_malloc (sizeof (join_msg) + data_size);
    join_msg->size = htons (sizeof (join_msg) + data_size);
    join_msg->type = htons (123);
    GNUNET_memcpy (&join_msg[1], data, data_size);

    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Peer #%u (%s) tries to join multicast group %s\n",
                multicast_peer->peer,
                GNUNET_i2s (multicast_peers[multicast_peer->peer]->id),
                GNUNET_h2s (&group_pub_key_hash));

    members[multicast_peer->peer] =
      GNUNET_MULTICAST_member_join (cfg,
                                    &group_pub_key,
                                    multicast_peer->key,
                                    multicast_peers[0]->id,
                                    0,
                                    NULL,
                                    join_msg, /* join message */
                                    member_join_request,
                                    member_join_decision,
                                    member_replay_frag,
                                    member_replay_msg,
                                    member_message,
                                    cls);
    return members[multicast_peer->peer];
  }
}


static void
peer_information_cb (void *cls,
                     struct GNUNET_TESTBED_Operation *operation,
                     const struct GNUNET_TESTBED_PeerInformation *pinfo,
                     const char *emsg)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;

  if (NULL == pinfo) {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "got no peer information\n");
    result = GNUNET_SYSERR;
    GNUNET_SCHEDULER_shutdown ();
  }

  multicast_peers[mc_peer->peer]->id = pinfo->result.id;

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Got peer information of %s (%s)\n",
              (0 == mc_peer->peer)? "origin" : "member",
              GNUNET_i2s (pinfo->result.id));

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Create peer #%u (%s)\n",
              mc_peer->peer,
              GNUNET_i2s (multicast_peers[mc_peer->peer]->id));

  if (0 != mc_peer->peer)
  {
    /* connect to multicast service of members */
    op[mc_peer->peer] =
      GNUNET_TESTBED_service_connect (/* Closure for operation */
                                      NULL,
                                      /* The peer whose service to connect to */
                                      peers[mc_peer->peer],
                                      /* The name of the service */
                                      "multicast",
                                      /* called after a handle to service is opened */
                                      service_connect,
                                      /* closure for the above callback */
                                      cls,
                                      /* called when opening the service connection */
                                      multicast_connect,
                                      /* called when closing the service connection */
                                      multicast_disconnect,
                                      /* closure for the above two callbacks */
                                      cls);
  }
}


static void
service_connect (void *cls,
                 struct GNUNET_TESTBED_Operation *op,
                 void *ca_result,
                 const char *emsg)
{
  struct MulticastPeerContext *mc_peer = (struct MulticastPeerContext*)cls;

  if (NULL == ca_result)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Connection adapter not created for peer #%u (%s)\n",
                mc_peer->peer,
                GNUNET_i2s (multicast_peers[mc_peer->peer]->id));

    result = GNUNET_SYSERR;
    GNUNET_SCHEDULER_shutdown();
  }

  if (0 == mc_peer->peer)
  {
    // Get GNUnet identity of members
    for (int i = 0; i<PEERS_REQUESTED; i++)
    {
      pi_op[i] = GNUNET_TESTBED_peer_get_information (peers[i],
                                                      GNUNET_TESTBED_PIT_IDENTITY,
                                                      peer_information_cb,
                                                      multicast_peers[i]);
    }
  }
}



/**
 * Main function inovked from TESTBED once all of the
 * peers are up and running.  This one then connects
 * just to the multicast service of peer 0 and 1.
 * Peer 0 is going to be origin.
 * Peer 1 is going to be one member.
 * Origin will start a multicast group and the member will try to join it.
 * After that we execute some multicast test.
 *
 * @param cls closure
 * @param h the run handle
 * @param peers started peers for the test
 * @param PEERS_REQUESTED size of the 'peers' array
 * @param links_succeeded number of links between peers that were created
 * @param links_failed number of links testbed was unable to establish
 */
static void
testbed_master (void *cls,
                struct GNUNET_TESTBED_RunHandle *h,
                unsigned int num_peers,
                struct GNUNET_TESTBED_Peer **p,
                unsigned int links_succeeded,
                unsigned int links_failed)
{
  /* Testbed is ready with peers running and connected in a pre-defined overlay
     topology (FIXME)  */
  peers = p;
  multicast_peers = GNUNET_new_array (PEERS_REQUESTED, struct MulticastPeerContext*);

  // Create test contexts for members
  for (int i = 0; i<PEERS_REQUESTED; i++)
  {
    multicast_peers[i] = GNUNET_new (struct MulticastPeerContext);
    multicast_peers[i]->peer = i;
    multicast_peers[i]->test_ok = GNUNET_NO;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Create origin peer\n");
  op[0] =
    GNUNET_TESTBED_service_connect (/* Closure for operation */
                                    NULL,
                                    /* The peer whose service to connect to */
                                    peers[0],
                                    /* The name of the service */
                                    "multicast",
                                    /* called after a handle to service is opened */
                                    service_connect,
                                    /* closure for the above callback */
                                    multicast_peers[0],
                                    /* called when opening the service connection */
                                    multicast_connect,
                                    /* called when closing the service connection */
                                    multicast_disconnect,
                                    /* closure for the above two callbacks */
                                    multicast_peers[0]);
  /* Schedule a new task on shutdown */
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
  /* Schedule the shutdown task with a delay of a few Seconds */
  timeout_tid =
    GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
                                  (GNUNET_TIME_UNIT_SECONDS, 400),
				  &timeout_task,
                                  NULL);
}


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

  if (strstr (argv[0], "_line") != NULL)
  {
    config_file = "test_multicast_line.conf";
  }
  else if (strstr(argv[0], "_star") != NULL)
  {
    config_file = "test_multicast_star.conf";
  }
  else
  {
    config_file = "test_multicast_star.conf";
  }

  result = GNUNET_SYSERR;
  ret =
    GNUNET_TESTBED_test_run ("test-multicast-multipeer",
                             config_file,
                             /* number of peers to start */
                             PEERS_REQUESTED,
                             /* Event mask - set to 0 for no event notifications */
                             0LL,
                             /* Controller event callback */
                             NULL,
                             /* Closure for controller event callback */
                             NULL,
                             /* called when testbed setup is complete */
                             testbed_master,
                             /* Closure for the test_master callback */
                             NULL);
  if ( (GNUNET_OK != ret) || (GNUNET_OK != result) )
    return 1;
  return 0;
}

/* end of test_multicast_multipeer.c */