/*
 * 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.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 *
 */

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

#include <sys/types.h>
#include <stdio.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>

#include "opal/mca/event/event.h"
#include "opal/runtime/opal.h"
#include "opal/mca/paffinity/paffinity.h"

#include "orte/util/show_help.h"
#include "opal/mca/mca.h"
#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_param.h"
#include "opal/util/output.h"
#include "opal/util/opal_sos.h"
#include "opal/util/malloc.h"
#include "opal/util/argv.h"

#include "orte/mca/rml/base/base.h"
#include "orte/mca/rml/rml_types.h"
#include "orte/mca/routed/base/base.h"
#include "orte/mca/routed/routed.h"
#include "orte/mca/errmgr/base/base.h"
#include "orte/mca/grpcomm/base/base.h"
#include "orte/mca/iof/base/base.h"
#include "orte/mca/ess/base/base.h"
#include "orte/mca/ess/ess.h"
#include "orte/mca/ras/base/base.h"
#include "orte/mca/plm/base/base.h"

#include "orte/mca/rmaps/base/base.h"
#if OPAL_ENABLE_FT_CR == 1
#include "orte/mca/snapc/base/base.h"
#endif
#include "orte/mca/filem/base/base.h"
#include "orte/util/proc_info.h"
#include "orte/util/session_dir.h"
#include "orte/util/name_fns.h"
#include "orte/util/nidmap.h"

#include "orte/runtime/runtime.h"
#include "orte/runtime/orte_wait.h"
#include "orte/runtime/orte_globals.h"

#include "orte/runtime/orte_cr.h"
#include "orte/mca/ess/ess.h"
#include "orte/mca/ess/base/base.h"
#include "orte/mca/ess/env/ess_env.h"

static int env_set_name(void);

static int rte_init(void);
static int rte_finalize(void);
static uint8_t proc_get_locality(orte_process_name_t *proc);
static orte_vpid_t proc_get_daemon(orte_process_name_t *proc);
static char* proc_get_hostname(orte_process_name_t *proc);
static orte_local_rank_t proc_get_local_rank(orte_process_name_t *proc);
static orte_node_rank_t proc_get_node_rank(orte_process_name_t *proc);
static int update_pidmap(opal_byte_object_t *bo);
static int update_nidmap(opal_byte_object_t *bo);

#if OPAL_ENABLE_FT_CR == 1
static int rte_ft_event(int state);
#endif

orte_ess_base_module_t orte_ess_env_module = {
    rte_init,
    rte_finalize,
    orte_ess_base_app_abort,
    proc_get_locality,
    proc_get_daemon,
    proc_get_hostname,
    proc_get_local_rank,
    proc_get_node_rank,
    orte_ess_base_proc_get_epoch,  /* proc_get_epoch */
    update_pidmap,
    update_nidmap,
    orte_ess_base_query_sys_info,
#if OPAL_ENABLE_FT_CR == 1
    rte_ft_event
#else
    NULL
#endif
};

/*
 * Local variables
 */
static orte_node_rank_t my_node_rank=ORTE_NODE_RANK_INVALID;

static int rte_init(void)
{
    int ret;
    char *error = NULL;
    char **hosts = NULL;
    char *nodelist;

    /* run the prolog */
    if (ORTE_SUCCESS != (ret = orte_ess_base_std_prolog())) {
        error = "orte_ess_base_std_prolog";
        goto error;
    }
    
    /* Start by getting a unique name from the enviro */
    env_set_name();

    /* if I am a daemon, complete my setup using the
     * default procedure
     */
    if (ORTE_PROC_IS_DAEMON) {
        /* get the list of nodes used for this job */
        nodelist = getenv("OMPI_MCA_orte_nodelist");
        
        if (NULL != nodelist) {
            /* split the node list into an argv array */
            hosts = opal_argv_split(nodelist, ',');
        }
        if (ORTE_SUCCESS != (ret = orte_ess_base_orted_setup(hosts))) {
            ORTE_ERROR_LOG(ret);
            error = "orte_ess_base_orted_setup";
            goto error;
        }
        opal_argv_free(hosts);
        return ORTE_SUCCESS;
    }
    
    if (ORTE_PROC_IS_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;
        }
        /* as a tool, I don't need a nidmap - so just return now */
        return ORTE_SUCCESS;
        
    }
    
    /* otherwise, I must be an application process - use
     * the default procedure to finish my setup
     */
    if (ORTE_SUCCESS != (ret = orte_ess_base_app_setup())) {
        ORTE_ERROR_LOG(ret);
        error = "orte_ess_base_app_setup";
        goto error;
    }
    
    /* if one was provided, build my nidmap */
    if (ORTE_SUCCESS != (ret = orte_util_nidmap_init(orte_process_info.sync_buf))) {
        ORTE_ERROR_LOG(ret);
        error = "orte_util_nidmap_init";
        goto error;
    }
    
    return ORTE_SUCCESS;

error:
    orte_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_PROC_IS_DAEMON) {
        if (ORTE_SUCCESS != (ret = orte_ess_base_orted_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
    } else if (ORTE_PROC_IS_TOOL) {
        /* otherwise, if I am a tool proc, use that procedure */
        if (ORTE_SUCCESS != (ret = orte_ess_base_tool_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
        /* as a tool, I didn't create a nidmap - so just return now */
        return ret;
    } else {
        /* otherwise, I must be an application process
         * use the default procedure to finish
         */
        if (ORTE_SUCCESS != (ret = orte_ess_base_app_finalize())) {
            ORTE_ERROR_LOG(ret);
        }
    }
    
    /* deconstruct the nidmap and jobmap arrays */
    orte_util_nidmap_finalize();
    
    return ret;    
}

static uint8_t proc_get_locality(orte_process_name_t *proc)
{
    orte_nid_t *nid;
    
    if (NULL == (nid = orte_util_lookup_nid(proc))) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return OPAL_PROC_NON_LOCAL;
    }
    
    if (nid->daemon == ORTE_PROC_MY_DAEMON->vpid) {
        OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                             "%s ess:env: proc %s on LOCAL NODE",
                             ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                             ORTE_NAME_PRINT(proc)));
        return (OPAL_PROC_ON_NODE | OPAL_PROC_ON_CU | OPAL_PROC_ON_CLUSTER);
    }

    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: proc %s is REMOTE",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(proc)));
    
    return OPAL_PROC_NON_LOCAL;
    
}

static orte_vpid_t proc_get_daemon(orte_process_name_t *proc)
{
    orte_nid_t *nid;

    if( ORTE_JOBID_IS_DAEMON(proc->jobid) ) {
        return proc->vpid;
    }

    if (NULL == (nid = orte_util_lookup_nid(proc))) {
        return ORTE_VPID_INVALID;
    }
    
    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: proc %s is hosted by daemon %s",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(proc),
                         ORTE_VPID_PRINT(nid->daemon)));
    
    return nid->daemon;
}

static char* proc_get_hostname(orte_process_name_t *proc)
{
    orte_nid_t *nid;
        
    if (NULL == (nid = orte_util_lookup_nid(proc))) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return NULL;
    }
    
    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: proc %s is on host %s",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(proc),
                         nid->name));
    
    return nid->name;
}

static orte_local_rank_t proc_get_local_rank(orte_process_name_t *proc)
{
    orte_pmap_t *pmap;
    
    if (NULL == (pmap = orte_util_lookup_pmap(proc))) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return ORTE_LOCAL_RANK_INVALID;
    }    
    
    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: proc %s has local rank %d",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(proc),
                         (int)pmap->local_rank));
    
    return pmap->local_rank;
}

static orte_node_rank_t proc_get_node_rank(orte_process_name_t *proc)
{
    orte_pmap_t *pmap;
    orte_ns_cmp_bitmask_t mask;

    mask = ORTE_NS_CMP_JOBID | ORTE_NS_CMP_VPID;
    
    /* is this me? */
    if (OPAL_EQUAL == orte_util_compare_name_fields(mask, proc, ORTE_PROC_MY_NAME)) {
        /* yes it is - reply with my rank. This is necessary
         * because the pidmap will not have arrived when I
         * am starting up, and if we use static ports, then
         * I need to know my node rank during init
         */
        return my_node_rank;
    }
    
    if (NULL == (pmap = orte_util_lookup_pmap(proc))) {
        return ORTE_NODE_RANK_INVALID;
    }    
    
    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: proc %s has node rank %d",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME),
                         ORTE_NAME_PRINT(proc),
                         (int)pmap->node_rank));
    
    return pmap->node_rank;
}

static int update_pidmap(opal_byte_object_t *bo)
{
    int ret;
    
    OPAL_OUTPUT_VERBOSE((2, orte_ess_base_output,
                         "%s ess:env: updating pidmap",
                         ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));
    
    /* build the pmap */
    if (ORTE_SUCCESS != (ret = orte_util_decode_pidmap(bo))) {
        ORTE_ERROR_LOG(ret);
    }
    
    return ret;
}

static int update_nidmap(opal_byte_object_t *bo)
{
    int rc;
    /* decode the nidmap - the util will know what to do */
    if (ORTE_SUCCESS != (rc = orte_util_decode_nodemap(bo))) {
        ORTE_ERROR_LOG(rc);
    }    
    return rc;
}

static int env_set_name(void)
{
    char *tmp;
    int rc;
    orte_jobid_t jobid;
    orte_vpid_t vpid;
    
    mca_base_param_reg_string_name("orte", "ess_jobid", "Process jobid",
                                   true, false, NULL, &tmp);
    if (NULL == tmp) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return ORTE_ERR_NOT_FOUND;
    }
    if (ORTE_SUCCESS != (rc = orte_util_convert_string_to_jobid(&jobid, tmp))) {
        ORTE_ERROR_LOG(rc);
        return(rc);
    }
    free(tmp);
    
    mca_base_param_reg_string_name("orte", "ess_vpid", "Process vpid",
                                   true, false, NULL, &tmp);
    if (NULL == tmp) {
        ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
        return ORTE_ERR_NOT_FOUND;
    }
    if (ORTE_SUCCESS != (rc = orte_util_convert_string_to_vpid(&vpid, tmp))) {
        ORTE_ERROR_LOG(rc);
        return(rc);
    }
    free(tmp);

    ORTE_PROC_MY_NAME->jobid = jobid;
    ORTE_PROC_MY_NAME->vpid = vpid;
    ORTE_PROC_MY_NAME->epoch = orte_ess.proc_get_epoch(ORTE_PROC_MY_NAME);
    
    OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                         "ess:env set name to %s", ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));
    
    /* get my node rank in case we are using static ports - this won't
     * be present for daemons, so don't error out if we don't have it
     */
    mca_base_param_reg_string_name("orte", "ess_node_rank", "Process node rank",
                                   true, false, NULL, &tmp);
    if (NULL != tmp) {
        my_node_rank = strtol(tmp, NULL, 10);
    }
    
    /* get the non-name common environmental variables */
    if (ORTE_SUCCESS != (rc = orte_ess_env_get())) {
        ORTE_ERROR_LOG(rc);
        return rc;
    }

    return ORTE_SUCCESS;
}

#if OPAL_ENABLE_FT_CR == 1
static int rte_ft_event(int state)
{
    int ret, exit_status = ORTE_SUCCESS;
    orte_proc_type_t svtype;

    /******** Checkpoint Prep ********/
    if(OPAL_CRS_CHECKPOINT == state) {
        /*
         * Notify SnapC
         */
        if( ORTE_SUCCESS != (ret = orte_snapc.ft_event(OPAL_CRS_CHECKPOINT))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Notify Routed
         */
        if( ORTE_SUCCESS != (ret = orte_routed.ft_event(OPAL_CRS_CHECKPOINT))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Notify RML -> OOB
         */
        if( ORTE_SUCCESS != (ret = orte_rml.ft_event(OPAL_CRS_CHECKPOINT))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }
    }
    /******** Continue Recovery ********/
    else if (OPAL_CRS_CONTINUE == state ) {
        OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                             "ess:env ft_event(%2d) - %s is Continuing",
                             state, ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));

        /*
         * Notify RML -> OOB
         */
        if( ORTE_SUCCESS != (ret = orte_rml.ft_event(OPAL_CRS_CONTINUE))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Notify Routed
         */
        if( ORTE_SUCCESS != (ret = orte_routed.ft_event(OPAL_CRS_CONTINUE))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Notify SnapC
         */
        if( ORTE_SUCCESS != (ret = orte_snapc.ft_event(OPAL_CRS_CONTINUE))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        if( orte_cr_continue_like_restart ) {
            /*
             * Barrier to make all processes have been successfully restarted before
             * we try to remove some restart only files.
             */
            if (ORTE_SUCCESS != (ret = orte_grpcomm.barrier())) {
                opal_output(0, "ess:env: ft_event(%2d): Failed in orte_grpcomm.barrier (%d)",
                            state, ret);
                return ret;
            }

            if( orte_cr_flush_restart_files ) {
                OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                                     "ess:env ft_event(%2d): %s "
                                     "Cleanup restart files...",
                                     state, ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));
                opal_crs_base_cleanup_flush();
            }
        }
    }
    /******** Restart Recovery ********/
    else if (OPAL_CRS_RESTART == state ) {
        OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                             "ess:env ft_event(%2d) - %s is Restarting",
                             state, ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));

        /*
         * This should follow the ess init() function
         */

        /*
         * Clear nidmap and jmap
         */
        orte_util_nidmap_finalize();

        /*
         * - Reset Contact information
         */
        if( ORTE_SUCCESS != (ret = env_set_name() ) ) {
            exit_status = ret;
        }

        /*
         * Notify RML -> OOB
         */
        if( ORTE_SUCCESS != (ret = orte_rml.ft_event(OPAL_CRS_RESTART))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Restart the routed framework
         * JJH: Lie to the finalize function so it does not try to contact the daemon.
         */
        svtype = orte_process_info.proc_type;
        orte_process_info.proc_type = ORTE_PROC_TOOL;
        if (ORTE_SUCCESS != (ret = orte_routed.finalize()) ) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }
        orte_process_info.proc_type = svtype;
        if (ORTE_SUCCESS != (ret = orte_routed.initialize()) ) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Group Comm - Clean out stale data
         */
        orte_grpcomm.finalize();
        if (ORTE_SUCCESS != (ret = orte_grpcomm.init())) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }
        if (ORTE_SUCCESS != (ret = orte_grpcomm.purge_proc_attrs())) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Restart the PLM - Does nothing at the moment, but included for completeness
         */
        if (ORTE_SUCCESS != (ret = orte_plm.finalize())) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        if (ORTE_SUCCESS != (ret = orte_plm.init())) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * RML - Enable communications
         */
        if (ORTE_SUCCESS != (ret = orte_rml.enable_comm())) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Notify Routed
         */
        if( ORTE_SUCCESS != (ret = orte_routed.ft_event(OPAL_CRS_RESTART))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /* if one was provided, build my nidmap */
        if (ORTE_SUCCESS != (ret = orte_util_nidmap_init(orte_process_info.sync_buf))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }

        /*
         * Barrier to make all processes have been successfully restarted before
         * we try to remove some restart only files.
         */
        if (ORTE_SUCCESS != (ret = orte_grpcomm.barrier())) {
            opal_output(0, "ess:env ft_event(%2d): Failed in orte_grpcomm.barrier (%d)",
                        state, ret);
            return ret;
        }
        if( orte_cr_flush_restart_files ) {
            OPAL_OUTPUT_VERBOSE((1, orte_ess_base_output,
                                 "ess:env ft_event(%2d): %s "
                                 "Cleanup restart files...",
                                 state, ORTE_NAME_PRINT(ORTE_PROC_MY_NAME)));

            opal_crs_base_cleanup_flush();
        }

        /*
         * Session directory re-init
         */
        if (orte_create_session_dirs) {
            if (ORTE_SUCCESS != (ret = orte_session_dir(true,
                                                        orte_process_info.tmpdir_base,
                                                        orte_process_info.nodename,
                                                        NULL, /* Batch ID -- Not used */
                                                        ORTE_PROC_MY_NAME))) {
                exit_status = ret;
            }
            
            opal_output_set_output_file_info(orte_process_info.proc_session_dir,
                                             "output-", NULL, NULL);
        }

        /*
         * Notify SnapC
         */
        if( ORTE_SUCCESS != (ret = orte_snapc.ft_event(OPAL_CRS_RESTART))) {
            ORTE_ERROR_LOG(ret);
            exit_status = ret;
            goto cleanup;
        }
    }
    else if (OPAL_CRS_TERM == state ) {
        /* Nothing */
    }
    else {
        /* Error state = Nothing */
    }

 cleanup:

    return exit_status;
}
#endif