/*
 * Copyright(c) 2020 ZettaScale Technology and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
 * v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */
#ifndef DDSI_ACKNACK_H
#define DDSI_ACKNACK_H

#include <stddef.h>
#include <stdbool.h>

#include "dds/ddsrt/time.h"
#include "dds/ddsi/q_xevent.h"
#include "dds/ddsi/ddsi_entity.h"
#include "dds/ddsi/q_protocol.h"

#if defined (__cplusplus)
extern "C" {
#endif

enum add_AckNack_result {
  AANR_SUPPRESSED_ACK,  //!< sending nothing: too short a time since the last ACK
  AANR_ACK,             //!< sending an ACK and there's nothing to NACK
  AANR_SUPPRESSED_NACK, //!< sending an ACK even though there are things to NACK
  AANR_NACK,            //!< sending a NACK, possibly also a NACKFRAG
  AANR_NACKFRAG_ONLY    //!< sending only a NACKFRAG
};

void sched_acknack_if_needed (struct xevent *ev, struct ddsi_proxy_writer *pwr, struct ddsi_pwr_rd_match *rwn, ddsrt_mtime_t tnow, bool avoid_suppressed_nack);

struct nn_xmsg *make_and_resched_acknack (struct xevent *ev, struct ddsi_proxy_writer *pwr, struct ddsi_pwr_rd_match *rwn, ddsrt_mtime_t tnow, bool avoid_suppressed_nack);

#if defined (__cplusplus)
}
#endif

#endif /* DDSI_ACKNACK_H */