/* -*- Mode: C; c-basic-offset:2 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2006      The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2006      The Technical University of Chemnitz. All
 *                         rights reserved.
 * Copyright (c) 2014-2015 Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * Copyright (c) 2015      Los Alamos National Security, LLC. All rights
 *                         reserved.
 *
 * Author(s): Torsten Hoefler <htor@cs.indiana.edu>
 *
 */
#include "nbc_internal.h"

/* an alltoallv schedule can not be cached easily because the contents
 * ot the recvcounts array may change, so a comparison of the address
 * would not be sufficient ... we simply do not cache it */

/* simple linear Alltoallv */
int ompi_coll_libnbc_ialltoallv(const void* sendbuf, const int *sendcounts, const int *sdispls,
                                MPI_Datatype sendtype, void* recvbuf, const int *recvcounts, const int *rdispls,
                                MPI_Datatype recvtype, struct ompi_communicator_t *comm, ompi_request_t ** request,
                                struct mca_coll_base_module_2_1_0_t *module)
{
  int rank, p, res;
  MPI_Aint sndext, rcvext;
  NBC_Schedule *schedule;
  char *rbuf, *sbuf, inplace;
  NBC_Handle *handle;
  ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;

  NBC_IN_PLACE(sendbuf, recvbuf, inplace);

  rank = ompi_comm_rank (comm);
  p = ompi_comm_size (comm);

  res = ompi_datatype_type_extent (sendtype, &sndext);
  if (MPI_SUCCESS != res) {
    NBC_Error("MPI Error in ompi_datatype_type_extent() (%i)", res);
    return res;
  }

  res = ompi_datatype_type_extent (recvtype, &rcvext);
  if (MPI_SUCCESS != res) {
    NBC_Error("MPI Error in ompi_datatype_type_extent() (%i)", res);
    return res;
  }

  /* copy data to receivbuffer */
  if ((sendcounts[rank] != 0) && !inplace) {
    rbuf = (char *) recvbuf + rdispls[rank] * rcvext;
    sbuf = (char *) sendbuf + sdispls[rank] * sndext;
    res = NBC_Copy (sbuf, sendcounts[rank], sendtype, rbuf, recvcounts[rank], recvtype, comm);
    if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
      return res;
    }
  }

  schedule = OBJ_NEW(NBC_Schedule);
  if (OPAL_UNLIKELY(NULL == schedule)) {
    return OMPI_ERR_OUT_OF_RESOURCE;
  }

  for (int i = 0 ; i < p ; ++i) {
    if (i == rank) {
      continue;
    }

    /* post all sends */
    if (sendcounts[i] != 0) {
      sbuf = ((char *) sendbuf) + (sdispls[i] * sndext);
      res = NBC_Sched_send(sbuf, false, sendcounts[i], sendtype, i, schedule, false);
      if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
        OBJ_RELEASE(schedule);
        return res;
      }
    }

    /* post all receives */
    if (recvcounts[i] != 0) {
      rbuf = ((char *) recvbuf) + (rdispls[i] * rcvext);
      res = NBC_Sched_recv(rbuf, false, recvcounts[i], recvtype, i, schedule, false);
      if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
        OBJ_RELEASE(schedule);
        return res;
      }
    }
  }

  res = NBC_Sched_commit (schedule);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    OBJ_RELEASE(schedule);
    return res;
  }

  res = NBC_Init_handle (comm, &handle, libnbc_module);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    OBJ_RELEASE(schedule);
    return res;
  }

  res = NBC_Start(handle, schedule);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    NBC_Return_handle (handle);
    OBJ_RELEASE(schedule);
    return res;
  }

  *request = (ompi_request_t *) handle;

  return OMPI_SUCCESS;
}

/* simple linear Alltoallv */
int ompi_coll_libnbc_ialltoallv_inter (const void* sendbuf, const int *sendcounts, const int *sdispls,
				       MPI_Datatype sendtype, void* recvbuf, const int *recvcounts, const int *rdispls,
				       MPI_Datatype recvtype, struct ompi_communicator_t *comm, ompi_request_t ** request,
				       struct mca_coll_base_module_2_1_0_t *module)
{
  int res, rsize;
  MPI_Aint sndext, rcvext;
  NBC_Schedule *schedule;
  char *rbuf, *sbuf;
  NBC_Handle *handle;
  ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;


  res = ompi_datatype_type_extent(sendtype, &sndext);
  if (MPI_SUCCESS != res) {
    NBC_Error("MPI Error in ompi_datatype_type_extent() (%i)", res);
    return res;
  }

  res = ompi_datatype_type_extent(recvtype, &rcvext);
  if (MPI_SUCCESS != res) {
    NBC_Error("MPI Error in ompi_datatype_type_extent() (%i)", res);
    return res;
  }

  rsize = ompi_comm_remote_size (comm);

  schedule = OBJ_NEW(NBC_Schedule);
  if (OPAL_UNLIKELY(NULL == schedule)) {
    return OMPI_ERR_OUT_OF_RESOURCE;
  }

  for (int i = 0; i < rsize; i++) {
    /* post all sends */
    if (sendcounts[i] != 0) {
      sbuf = (char *) sendbuf + sdispls[i] * sndext;
      res = NBC_Sched_send (sbuf, false, sendcounts[i], sendtype, i, schedule, false);
      if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
        OBJ_RELEASE(schedule);
        return res;
      }
    }
    /* post all receives */
    if (recvcounts[i] != 0) {
      rbuf = (char *) recvbuf + rdispls[i] * rcvext;
      res = NBC_Sched_recv (rbuf, false, recvcounts[i], recvtype, i, schedule, false);
      if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
        OBJ_RELEASE(schedule);
        return res;
      }
    }
  }

  res = NBC_Sched_commit(schedule);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    OBJ_RELEASE(schedule);
    return res;
  }

  res = NBC_Init_handle(comm, &handle, libnbc_module);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    OBJ_RELEASE(schedule);
    return res;
  }

  res = NBC_Start(handle, schedule);
  if (OPAL_UNLIKELY(OMPI_SUCCESS != res)) {
    NBC_Return_handle (handle);
    OBJ_RELEASE(schedule);
    return res;
  }

  *request = (ompi_request_t *) handle;

  return OMPI_SUCCESS;
}