/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <osip2/internal.h>
#include <osip2/osip.h>

#include "fsm.h"
#include "xixt.h"

int __osip_nict_init(osip_nict_t **nict, osip_t *osip, osip_message_t *request) {
  osip_route_t *route;
  int i;

  OSIP_TRACE(osip_trace(__FILE__, __LINE__, OSIP_INFO2, NULL, "allocating NICT context\n"));

  *nict = (osip_nict_t *) osip_malloc(sizeof(osip_nict_t));

  if (*nict == NULL)
    return OSIP_NOMEM;

  memset(*nict, 0, sizeof(osip_nict_t));
  /* for REQUEST retransmissions */
  {
    osip_via_t *via;
    char *proto;

    i = osip_message_get_via(request, 0, &via); /* get top via */

    if (i < 0) {
      osip_free(*nict);
      *nict = NULL;
      return i;
    }

    proto = via_get_protocol(via);

    if (proto == NULL) {
      osip_free(*nict);
      *nict = NULL;
      return OSIP_UNDEFINED_ERROR;
    }

#ifdef USE_BLOCKINGSOCKET

    if (osip_strcasecmp(proto, "TCP") != 0 && osip_strcasecmp(proto, "TLS") != 0 && osip_strcasecmp(proto, "SCTP") != 0) {
      (*nict)->timer_e_length = DEFAULT_T1;
      (*nict)->timer_k_length = DEFAULT_T4;
      (*nict)->timer_e_start.tv_sec = -1;
      (*nict)->timer_k_start.tv_sec = -1; /* not started */

    } else {                        /* reliable protocol is used: */
      (*nict)->timer_e_length = -1; /* E is not ACTIVE */
      (*nict)->timer_k_length = 0;  /* MUST do the transition immediatly */
      (*nict)->timer_e_start.tv_sec = -1;
      (*nict)->timer_k_start.tv_sec = -1; /* not started */
    }
  }
#else

    if (osip_strcasecmp(proto, "TCP") != 0 && osip_strcasecmp(proto, "TLS") != 0 && osip_strcasecmp(proto, "SCTP") != 0) {
      (*nict)->timer_e_length = DEFAULT_T1;
      (*nict)->timer_k_length = DEFAULT_T4;
      (*nict)->timer_e_start.tv_sec = -1;
      (*nict)->timer_k_start.tv_sec = -1; /* not started */

    } else { /* reliable protocol is used: */
      (*nict)->timer_e_length = DEFAULT_T1;
      (*nict)->timer_k_length = 0; /* MUST do the transition immediatly */
      (*nict)->timer_e_start.tv_sec = -1;
      (*nict)->timer_k_start.tv_sec = -1; /* not started */
    }
  }
#endif
  /* for PROXY, the destination MUST be set by the application layer,
     this one may not be correct. */
  osip_message_get_route(request, 0, &route);

  if (route != NULL && route->url != NULL) {
    osip_uri_param_t *lr_param;

    osip_uri_uparam_get_byname(route->url, "lr", &lr_param);

    if (lr_param == NULL) {
      /* using uncompliant proxy: destination is the request-uri */
      route = NULL;
    }
  }

  if (route != NULL && route->url != NULL) {
    int port = 5060;

    if (route->url->port != NULL)
      port = osip_atoi(route->url->port);

    osip_nict_set_destination((*nict), osip_strdup(route->url->host), port);

  } else {
    int port = 5060;

    /* search for maddr parameter */
    osip_uri_param_t *maddr_param = NULL;
    osip_uri_param_t *obr_param = NULL;
    osip_uri_param_t *obp_param = NULL;

    port = 5060;

    if (request->req_uri->port != NULL)
      port = osip_atoi(request->req_uri->port);

    /* if ob was used in Contact, then exosip adds "x-obr" and "x-obp", thus, when
       processing request, the ip/port destination are re-used here */
    osip_uri_uparam_get_byname(request->req_uri, "x-obr", &obr_param);
    osip_uri_uparam_get_byname(request->req_uri, "x-obp", &obp_param);

    osip_uri_uparam_get_byname(request->req_uri, "maddr", &maddr_param);

    if (maddr_param != NULL && maddr_param->gvalue != NULL)
      osip_nict_set_destination((*nict), osip_strdup(maddr_param->gvalue), port);

    else if (obr_param != NULL && obr_param->gvalue != NULL && obp_param != NULL && obp_param->gvalue != NULL)
      osip_nict_set_destination((*nict), osip_strdup(obr_param->gvalue), osip_atoi(obp_param->gvalue));

    else
      osip_nict_set_destination((*nict), osip_strdup(request->req_uri->host), port);
  }

  (*nict)->timer_f_length = 64 * DEFAULT_T1;
  osip_gettimeofday(&(*nict)->timer_f_start, NULL);
  add_gettimeofday(&(*nict)->timer_f_start, (*nict)->timer_f_length);

  /* Oups! a Bug! */
  /*  (*nict)->port  = 5060; */

  return OSIP_SUCCESS;
}

int __osip_nict_free(osip_nict_t *nict) {
  if (nict == NULL)
    return OSIP_SUCCESS;

  OSIP_TRACE(osip_trace(__FILE__, __LINE__, OSIP_INFO2, NULL, "free nict resource\n"));

  osip_free(nict->destination);
  osip_free(nict);
  return OSIP_SUCCESS;
}

int osip_nict_set_destination(osip_nict_t *nict, char *destination, int port) {
  if (nict == NULL)
    return OSIP_BADPARAMETER;

  if (nict->destination != NULL)
    osip_free(nict->destination);

  nict->destination = destination;
  nict->port = port;
  return OSIP_SUCCESS;
}

osip_event_t *__osip_nict_need_timer_e_event(osip_nict_t *nict, state_t state, int transactionid) {
  return __osip_transaction_need_timer_x_event(nict, &nict->timer_e_start, state == NICT_PROCEEDING || state == NICT_TRYING, transactionid, TIMEOUT_E);
}

osip_event_t *__osip_nict_need_timer_f_event(osip_nict_t *nict, state_t state, int transactionid) {
  return __osip_transaction_need_timer_x_event(nict, &nict->timer_f_start, state == NICT_PROCEEDING || state == NICT_TRYING, transactionid, TIMEOUT_F);
}

osip_event_t *__osip_nict_need_timer_k_event(osip_nict_t *nict, state_t state, int transactionid) {
  return __osip_transaction_need_timer_x_event(nict, &nict->timer_k_start, state == NICT_COMPLETED, transactionid, TIMEOUT_K);
}