/*
 * Copyright (c) 2004-2010 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2011 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2006-2013 Los Alamos National Security, LLC.
 *                         All rights reserved.
 * Copyright (c) 2009-2012 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2011      Oak Ridge National Labs.  All rights reserved.
 * Copyright (c) 2013-2020 Intel, Inc.  All rights reserved.
 * Copyright (c) 2015      Mellanox Technologies, Inc.  All rights reserved.
 * Copyright (c) 2021-2022 Nanook Consulting.  All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 *
 */

#include "src/include/pmix_config.h"
#include "include/pmix.h"

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#include "src/class/pmix_object.h"
#include "src/include/pmix_globals.h"
#include "src/util/pmix_output.h"
#include "src/util/pmix_printf.h"

#define MAXCNT 1

static volatile bool completed = false;
static pmix_proc_t myproc;

static void notification_fn(size_t evhdlr_registration_id, pmix_status_t status,
                            const pmix_proc_t *source, pmix_info_t info[], size_t ninfo,
                            pmix_info_t results[], size_t nresults,
                            pmix_event_notification_cbfunc_fn_t cbfunc, void *cbdata)
{
    PMIX_HIDE_UNUSED_PARAMS(evhdlr_registration_id, source, info, ninfo,
                            results, nresults);
    pmix_output(0, "Client %s:%d NOTIFIED with status %s", myproc.nspace, myproc.rank,
                PMIx_Error_string(status));
    if (NULL != cbfunc) {
        cbfunc(PMIX_SUCCESS, NULL, 0, NULL, NULL, cbdata);
    }
    completed = true;
}

static void errhandler_reg_callbk(pmix_status_t status, size_t errhandler_ref, void *cbdata)
{
    volatile bool *active = (volatile bool *) cbdata;

    pmix_output(0, "Client: ERRHANDLER REGISTRATION CALLBACK CALLED WITH STATUS %d, ref=%lu",
                status, (unsigned long) errhandler_ref);
    *active = false;
}

#define SIMPIO_MSG_MAX 8192

int main(int argc, char **argv)
{
    pmix_status_t rc;
    volatile bool active;
    int msgsize;
    char msg[SIMPIO_MSG_MAX];
    pmix_proc_t proc;
    int cnt = 0;
    PMIX_HIDE_UNUSED_PARAMS(argc, argv);

    /* init us */
    if (PMIX_SUCCESS != (rc = PMIx_Init(&myproc, NULL, 0))) {
        pmix_output(0, "Client ns %s rank %d: PMIx_Init failed: %s", myproc.nspace, myproc.rank,
                    PMIx_Error_string(rc));
        exit(rc);
    }
    pmix_output(0, "Client ns %s rank %d: Running", myproc.nspace, myproc.rank);

    /* register our errhandler */
    active = true;
    PMIx_Register_event_handler(NULL, 0, NULL, 0, notification_fn, errhandler_reg_callbk,
                                (void *) &active);
    while (active) {
        usleep(10);
    }

    /* if we are rank=0, read our stdin */
    if (0 == myproc.rank) {
        while (0 < (msgsize = read(0, msg, SIMPIO_MSG_MAX))) {
            cnt += msgsize;
            fprintf(stderr, "Rank %d: read %d bytes\n", myproc.rank, cnt);
        }
    }

    /* call fence to sync */
    PMIX_PROC_CONSTRUCT(&proc);
    pmix_strncpy(proc.nspace, myproc.nspace, PMIX_MAX_NSLEN);
    proc.rank = PMIX_RANK_WILDCARD;
    if (PMIX_SUCCESS != (rc = PMIx_Fence(&proc, 1, NULL, 0))) {
        pmix_output(0, "Client ns %s rank %d PMIx_Fence failed: %s", myproc.nspace, myproc.rank,
                    PMIx_Error_string(rc));
    }

    /* finalize us */
    pmix_output(0, "Client ns %s rank %d: Finalizing", myproc.nspace, myproc.rank);
    if (PMIX_SUCCESS != (rc = PMIx_Finalize(NULL, 0))) {
        fprintf(stderr, "Client ns %s rank %d:PMIx_Finalize failed: %s\n", myproc.nspace,
                myproc.rank, PMIx_Error_string(rc));
    } else {
        fprintf(stderr, "Client ns %s rank %d:PMIx_Finalize successfully completed\n",
                myproc.nspace, myproc.rank);
    }
    fflush(stderr);
    return (rc);
}