/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 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.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 *
 */

#include "orte_config.h"
#include "orte/constants.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif  /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif  /* HAVE_STRING_H */
#include <ctype.h>

#include "opal/util/opal_environ.h"
#include "opal/mca/base/mca_base_param.h"
#include "opal/util/argv.h"
#include "opal/util/show_help.h"

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

#include "orte/mca/ess/ess.h"
#include "orte/mca/ess/base/base.h"
#include "orte/mca/ess/slurm/ess_slurm.h"

static char *get_slurm_nodename(int nodeid);
static int slurm_set_name(void);

static int rte_init(char flags);
static int rte_finalize(void);


orte_ess_base_module_t orte_ess_slurm_module = {
    rte_init,
    rte_finalize,
    orte_ess_base_app_abort,
    NULL /* ft_event */
};


static int rte_init(char flags)
{
    int ret;
    char *error = NULL;
    
    /* Start by getting a unique name */
    slurm_set_name();
    
    /* if I am a daemon, complete my setup using the
     * default procedure
     */
    if (orte_process_info.daemon) {
        if (ORTE_SUCCESS != (ret = orte_ess_base_orted_setup())) {
            ORTE_ERROR_LOG(ret);
            error = "orte_ess_base_orted_setup";
            goto error;
        }
    } else if (orte_process_info.tool) {
        /* otherwise, if I am a tool proc, use that procedure */
        if (ORTE_SUCCESS != (ret = orte_ess_base_tool_setup())) {
            ORTE_ERROR_LOG(ret);
            error = "orte_ess_base_tool_setup";
            goto error;
        }
    } else {
        /* otherwise, I must be an application process, so
         * use that default procedure
         */
        if (ORTE_SUCCESS != (ret = orte_ess_base_app_setup())) {
            ORTE_ERROR_LOG(ret);
            error = "orte_ess_base_app_setup";
            goto error;
        }
    }
    
    return ORTE_SUCCESS;
    
error:
    opal_show_help("help-orte-runtime.txt",
                   "orte_init:startup:internal-failure",
                   true, error, ORTE_ERROR_NAME(ret), ret);
    
    return ret;
}

static int rte_finalize(void)
{
    int ret;
    
    /* if I am a daemon, finalize using the default procedure */
    if (orte_process_info.daemon) {
        if (ORTE_SUCCESS != (ret = orte_ess_base_orted_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
    } else if (orte_process_info.tool) {
        /* otherwise, if I am a tool proc, use that procedure */
        if (ORTE_SUCCESS != (ret = orte_ess_base_tool_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
    } else {
        /* otherwise, I must be an application process, so
         * use that default procedure
         */
        if (ORTE_SUCCESS != (ret = orte_ess_base_app_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
    }
    
    return ret;    
}

static int slurm_set_name(void)
{
    int slurm_nodeid;
    int rc;
    int id;
    orte_jobid_t jobid;
    orte_vpid_t vpid;
    char* jobid_string;
    char* vpid_string;
    
    
    OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                         "ess:slurm setting name"));
    
    id = mca_base_param_register_string("orte", "ess", "jobid", NULL, NULL);
    mca_base_param_lookup_string(id, &jobid_string);
    if (NULL == jobid_string) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return ORTE_ERR_NOT_FOUND;
    }
    if (ORTE_SUCCESS != (rc = orte_util_convert_string_to_jobid(&jobid, jobid_string))) {
        ORTE_ERROR_LOG(rc);
        return(rc);
    }
    
    id = mca_base_param_register_string("orte", "ess", "vpid", NULL, NULL);
    mca_base_param_lookup_string(id, &vpid_string);
    if (NULL == vpid_string) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return ORTE_ERR_NOT_FOUND;
    }
    if (ORTE_SUCCESS != (rc = orte_util_convert_string_to_vpid(&vpid, vpid_string))) {
        ORTE_ERROR_LOG(rc);
        return(rc);
    }
    
    ORTE_PROC_MY_NAME->jobid = jobid;
    
    /* fix up the vpid and make it the "real" vpid */
    slurm_nodeid = atoi(getenv("SLURM_NODEID"));
    ORTE_PROC_MY_NAME->vpid = vpid + slurm_nodeid;

    
    OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                         "ess:slurm set name to %s", ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));
    
    /* fix up the system info nodename to match exactly what slurm returned */
    if (NULL != orte_process_info.nodename) {
        free(orte_process_info.nodename);
    }
    orte_process_info.nodename = get_slurm_nodename(slurm_nodeid);

    
    OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                         "ess:slurm set nodename to %s",
                         orte_process_info.nodename));
    
    /* get the non-name common environmental variables */
    if (ORTE_SUCCESS != (rc = orte_ess_env_get())) {
        ORTE_ERROR_LOG(rc);
        return rc;
    }
    
    return ORTE_SUCCESS;
}

static char *
get_slurm_nodename(int nodeid)
{
    char **names = NULL;
    char *slurm_nodelist;
    char *ret;

    slurm_nodelist = getenv("OMPI_MCA_orte_slurm_nodelist");
    
    if (NULL == slurm_nodelist) {
        return NULL;
    }
    
    /* split the node list into an argv array */
    names = opal_argv_split(slurm_nodelist, ',');
    if (NULL == names) {  /* got an error */
        return NULL;
    }

    /* check to see if there are enough entries */
    if (nodeid > opal_argv_count(names)) {
        return NULL;
    }

    ret = strdup(names[nodeid]);

    opal_argv_free(names);

    /* All done */
    return ret;
}