/* -*- C -*-
 *
 * $HEADER$
 *
 */
#include <stdio.h>
#include <unistd.h>

#include "opal/dss/dss.h"
#include "opal/event/event.h"
#include "opal/util/output.h"

#include "orte/util/proc_info.h"
#include "orte/util/name_fns.h"
#include "orte/runtime/orte_globals.h"
#include "orte/runtime/runtime.h"
#include "orte/runtime/orte_wait.h"
#include "orte/mca/errmgr/errmgr.h"
#include "orte/mca/rmcast/rmcast.h"
#include "orte/mca/grpcomm/grpcomm.h"

static void cbfunc(int status,
                   orte_rmcast_channel_t channel,
                   orte_rmcast_tag_t tag,
                   orte_process_name_t *sender,
                   opal_buffer_t *buf, void *cbdata);
static void cbfunc_buf_snt(int status,
                           orte_rmcast_channel_t channel,
                           orte_rmcast_tag_t tag,
                           orte_process_name_t *sender,
                           opal_buffer_t *buf, void *cbdata);

static void cbfunc_iovec(int status,
                         orte_rmcast_channel_t channel,
                         orte_rmcast_tag_t tag,
                         orte_process_name_t *sender,
                         struct iovec *msg, int count, void* cbdata);

orte_rmcast_channel_t chan=4;

static void send_data(int fd, short flags, void *arg)
{
    opal_buffer_t buf, *bfptr;
    int32_t i32;
    struct iovec iovec_array[3];
    int rc, i;
    opal_event_t *tmp = (opal_event_t*)arg;
    struct timeval now;

    bfptr = OBJ_NEW(opal_buffer_t);
    i32 = -1;
    opal_dss.pack(bfptr, &i32, 1, OPAL_INT32);
    if (ORTE_SUCCESS != (rc = orte_rmcast.send_buffer_nb(chan,
                                                         ORTE_RMCAST_TAG_OUTPUT, bfptr,
                                                         cbfunc_buf_snt, NULL))) {
        ORTE_ERROR_LOG(rc);
        OBJ_RELEASE(bfptr);
        return;
    }        
    /* create an iovec array */
    for (i=0; i < 3; i++) {
        iovec_array[i].iov_base = (uint8_t*)malloc(30);
        iovec_array[i].iov_len = 30;
    }
    /* send it out */
    if (ORTE_SUCCESS != (rc = orte_rmcast.send(chan,
                                               ORTE_RMCAST_TAG_OUTPUT,
                                               iovec_array, 3))) {
        ORTE_ERROR_LOG(rc);
        return;
    }
    /* reset the timer */
    now.tv_sec = 5;
    now.tv_usec = 0;
    opal_evtimer_add(tmp, &now);
}

int main(int argc, char* argv[])
{
    int rc, i;
    char hostname[512];
    pid_t pid;
    opal_buffer_t buf, *bfptr;
    int32_t i32=1;
    struct iovec iovec_array[3];
    
    if (0 > (rc = orte_init(&argc, &argv, ORTE_PROC_NON_MPI))) {
        fprintf(stderr, "orte_nodename: couldn't init orte - error code %d\n", rc);
        return rc;
    }
    
    gethostname(hostname, 512);
    pid = getpid();
    
    printf("orte_mcast: Node %s Name %s Pid %ld\n",
           hostname, ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), (long)pid);
    

    
    if (0 == ORTE_PROC_MY_NAME->vpid) {
        orte_grpcomm.barrier();

        /* open a new channel */
        if (ORTE_SUCCESS != (rc = orte_rmcast.open_channel(&chan, "orte_mcast", NULL, -1, NULL, ORTE_RMCAST_XMIT))) {
            ORTE_ERROR_LOG(rc);
            goto blast;
        }
        
        OBJ_CONSTRUCT(&buf, opal_buffer_t);
        /* pass the new channel number */
        i32 = chan;
        opal_dss.pack(&buf, &i32, 1, OPAL_INT32);
        if (ORTE_SUCCESS != (rc = orte_rmcast.send_buffer(ORTE_RMCAST_APP_PUBLIC_CHANNEL,
                                                          ORTE_RMCAST_TAG_ANNOUNCE, &buf))) {
            ORTE_ERROR_LOG(rc);
            OBJ_DESTRUCT(&buf);
            goto blast;
        }
        OBJ_DESTRUCT(&buf);
        
        /* wake up every 5 seconds and send something */
        ORTE_TIMER_EVENT(5, 0, send_data);
    } else {
        if (ORTE_SUCCESS != (rc = orte_rmcast.recv_buffer_nb(ORTE_RMCAST_APP_PUBLIC_CHANNEL,
                                                             ORTE_RMCAST_TAG_WILDCARD,
                                                             ORTE_RMCAST_PERSISTENT,
                                                             cbfunc, NULL))) {
            ORTE_ERROR_LOG(rc);
        }
        orte_grpcomm.barrier();  /* ensure the public recv is ready */
    }
    opal_event_dispatch();
    
blast:    
    orte_finalize();
    return 0;
}

static void cbfunc(int status,
                   orte_rmcast_channel_t channel,
                   orte_rmcast_tag_t tag,
                   orte_process_name_t *sender,
                   opal_buffer_t *buffer, void *cbdata)
{
    int32_t i32, rc;

    /* retrieve the value sent */
    rc = 1;
    opal_dss.unpack(buffer, &i32, &rc, OPAL_INT32);

    opal_output(0, "%s GOT BUFFER MESSAGE from %s on channel %d tag %d with value %d\n",
            ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
            ORTE_NAME_PRINT(sender), channel, tag, i32);

    if (i32 < 0) {
        return;
    }
    
    /* open a new channel */
    chan = i32;
    if (ORTE_SUCCESS != (rc = orte_rmcast.open_channel(&chan, "orte_mcast", NULL, -1, NULL, ORTE_RMCAST_RECV))) {
        ORTE_ERROR_LOG(rc);
    }
    
    /* setup to recv data on it */
    if (ORTE_SUCCESS != (rc = orte_rmcast.recv_buffer_nb(chan,
                                                         ORTE_RMCAST_TAG_OUTPUT,
                                                         ORTE_RMCAST_PERSISTENT,
                                                         cbfunc, NULL))) {
        ORTE_ERROR_LOG(rc);
    }
    if (ORTE_SUCCESS != (rc = orte_rmcast.recv_nb(chan,
                                                  ORTE_RMCAST_TAG_OUTPUT,
                                                  ORTE_RMCAST_PERSISTENT,
                                                  cbfunc_iovec, NULL))) {
        ORTE_ERROR_LOG(rc);
    }
}

static void cbfunc_iovec(int status,
                         orte_rmcast_channel_t channel,
                         orte_rmcast_tag_t tag,
                         orte_process_name_t *sender,
                         struct iovec *msg, int count, void* cbdata)
{
    int rc;
    
    opal_output(0, "%s GOT IOVEC MESSAGE from %s of %d elements on tag %d\n",
            ORTE_NAME_PRINT(ORTE_PROC_MY_NAME), ORTE_NAME_PRINT(sender), count, tag);

}

static void cbfunc_buf_snt(int status,
                           orte_rmcast_channel_t channel,
                           orte_rmcast_tag_t tag,
                           orte_process_name_t *sender,
                           opal_buffer_t *buf, void *cbdata)
{
    opal_output(0, "%s BUFFERED_NB SEND COMPLETE\n", ORTE_NAME_PRINT(ORTE_PROC_MY_NAME));
    
    OBJ_RELEASE(buf);
}