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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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#include <ross.h>
#include <assert.h>
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#include <string.h>
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#include "codes/lp-io.h"
#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
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#include "codes/model-net-lp.h"
#include "codes/net/torus.h"
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#include "codes/rc-stack.h"
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#define DEBUG 1
#define MEAN_INTERVAL 100
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#define TRACE -1
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#define TRACK -1
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#define STATICQ 0
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/* collective specific parameters */
#define TREE_DEGREE 4
#define LEVEL_DELAY 1000
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#define TORUS_COLLECTIVE_DEBUG 0
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#define NUM_COLLECTIVES  1
#define COLLECTIVE_COMPUTATION_DELAY 5700
#define TORUS_FAN_OUT_DELAY 20.0

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#define LP_CONFIG_NM (model_net_lp_config_names[TORUS])
#define LP_METHOD_NM (model_net_method_names[TORUS])

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static double maxd(double a, double b) { return a < b ? b : a; }

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/* Torus network model implementation of codes, implements the modelnet API */
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typedef struct nodes_message_list nodes_message_list;
struct nodes_message_list {
    nodes_message msg;
    char* event_data;
    nodes_message_list *next;
    nodes_message_list *prev;
};

void init_nodes_message_list(nodes_message_list *this, nodes_message *inmsg) {
    this->msg = *inmsg;
    this->event_data = NULL;
    this->next = NULL;
    this->prev = NULL;
}

void delete_nodes_message_list(nodes_message_list *this) {
    if(this->event_data != NULL) free(this->event_data);
    free(this);
}

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static void free_tmp(void * ptr)
{
    nodes_message_list * entry = ptr;
    if(entry->event_data != NULL)
        free(entry->event_data);

    free(entry);
}
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typedef struct torus_param torus_param;
struct torus_param
{
    int n_dims; /*Dimension of the torus network, 5-D, 7-D or any other*/
    int* dim_length; /*Length of each torus dimension*/
    double link_bandwidth;/* bandwidth for each torus link */
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    double cn_bandwidth; /* injection bandwidth */
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    int buffer_size; /* number of buffer slots for each vc in flits*/
    int num_vc; /* number of virtual channels for each torus link */
    float mean_process;/* mean process time for each flit  */
    int chunk_size; /* chunk is the smallest unit--default set to 32 */

    /* "derived" torus parameters */

    /* factor, used in torus coordinate calculation */
    int * factor;
    /* half length of each dimension, used in torus coordinates calculation */
    int * half_length;

    double head_delay;
    double credit_delay;
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    double cn_delay;

    double router_delay;
    int routing;
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};
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/* codes mapping group name, lp type name */
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static char grp_name[MAX_NAME_LENGTH];
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/* codes mapping group id, lp type id, repetition id and offset */
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int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
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/* for calculating torus model statistics, average and maximum travel time of a packet */
static tw_stime         total_time = 0;
static tw_stime         max_latency = 0;
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static tw_stime         max_collective = 0;
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/* number of finished packets on each PE */
static long long       N_finished_packets = 0;
/* total number of hops traversed by a message on each PE */
static long long       total_hops = 0;

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/* annotation-specific parameters (unannotated entry occurs at the 
 * last index) */
static uint64_t                  num_params = 0;
static torus_param             * all_params = NULL;
static const config_anno_map_t * anno_map   = NULL;
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typedef struct nodes_state nodes_state;

/* state of a torus node */
struct nodes_state
{
  /* counts the number of packets sent from this compute node */
  unsigned long long packet_counter;            
  /* availability time of each torus link */
  tw_stime** next_link_available_time; 
  /* availability of each torus credit link */
  tw_stime** next_credit_available_time;
  /* next flit generate time */
  tw_stime** next_flit_generate_time;
  /* buffer size for each torus virtual channel */
  int** buffer;
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  /* Head and tail of the terminal messages list */
  nodes_message_list **terminal_msgs;
  nodes_message_list **terminal_msgs_tail;
  int all_term_length;
  int *terminal_length, *queued_length;
  /* pending packets to be sent out */
  nodes_message_list ***pending_msgs;
  nodes_message_list ***pending_msgs_tail;
  nodes_message_list ***queued_msgs;
  nodes_message_list ***queued_msgs_tail;
  nodes_message_list **other_msgs;
  nodes_message_list **other_msgs_tail;
  int *in_send_loop;
  /* traffic through each torus link */
  int64_t *link_traffic;
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  /* coordinates of the current torus node */
  int* dim_position;
  /* neighbor LP ids for this torus node */
  int* neighbour_minus_lpID;
  int* neighbour_plus_lpID;

  /* records torus statistics for this LP having different communication categories */
  struct mn_stats torus_stats_array[CATEGORY_MAX];
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   /* for collective operations */

  /* collective init time */
  tw_stime collective_init_time;

  /* node ID in the tree */ 
   tw_lpid node_id;

   /* messages sent & received in collectives may get interchanged several times so we have to save the 
     origin server information in the node's state */
   tw_lpid origin_svr; 
  
  /* parent node ID of the current node */
   tw_lpid parent_node_id;
   /* array of children to be allocated in terminal_init*/
   tw_lpid* children;

   /* children of a node can be less than or equal to the tree degree */
   int num_children;

   short is_root;
   short is_leaf;

   /* to maintain a count of child nodes that have fanned in at the parent during the collective
      fan-in phase*/
   int num_fan_nodes;
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   /* LPs annotation */
   const char * anno;
   /* LPs configuration */
   const torus_param * params;
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   /* create the RC stack */
   struct rc_stack * st;
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   /* finished chunks */
   long finished_chunks;

   /* finished packets */
   long finished_packets;

   /* total hops */
   double total_hops;

   /* total time */
   double total_time;

   /* total data */
   long total_data_sz;
   /* output buf */
   char output_buf[2048];
   char output_busy_buf[2048];

   /* busy time */
   tw_stime * busy_time;
   tw_stime * last_buf_full;
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};

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static void append_to_node_message_list(  
        nodes_state *ns, 
        nodes_message_list ** thisq,
        nodes_message_list ** thistail,
        int index, 
        nodes_message_list *msg) {
    if(thisq[index] == NULL) {
        thisq[index] = msg;
    } else {
        thistail[index]->next = msg;
        msg->prev = thistail[index];
    } 
    thistail[index] = msg;
}
static void prepend_to_node_message_list(  
        nodes_state *ns, 
        nodes_message_list ** thisq,
        nodes_message_list ** thistail,
        int index, 
        nodes_message_list *msg) {
    if(thisq[index] == NULL) {
        thistail[index] = msg;
    } else {
        thisq[index]->prev = msg;
        msg->next = thisq[index];
    } 
    thisq[index] = msg;
}

static nodes_message_list* return_head(
        nodes_state *ns,
        nodes_message_list ** thisq,
        nodes_message_list ** thistail,
        int index) {
    nodes_message_list *head = thisq[index];
    if(head != NULL) {
        thisq[index] = head->next;
        if(head->next != NULL) {
            head->next->prev = NULL;
            head->next = NULL;
        } else {
            thistail[index] = NULL;
        }
    }
    return head;
}

static nodes_message_list* return_tail(
        nodes_state *ns,
        nodes_message_list ** thisq,
        nodes_message_list ** thistail,
        int index) {
    nodes_message_list *tail = thistail[index];
    if(tail->prev != NULL) {
        tail->prev->next = NULL;
        thistail[index] = tail->prev;
        tail->prev = NULL;
    } else {
        thistail[index] = NULL;
        thisq[index] = NULL;
    }
    return tail;
}

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static void torus_read_config(
        const char         * anno,
        torus_param        * params){
    char dim_length_str[MAX_NAME_LENGTH];
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    int i;
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    // shorthand
    torus_param *p = params;

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    int rc = configuration_get_value_int(&config, "PARAMS", "n_dims", anno, &p->n_dims);
    if(rc) {
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        p->n_dims = 4; /* a 4-D torus */
        fprintf(stderr, 
                "Warning: Number of dimensions not specified, setting to %d\n",
                p->n_dims);
    }

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   rc = configuration_get_value_double(&config, "PARAMS", "link_bandwidth", anno,
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            &p->link_bandwidth);
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    if(rc) {
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        p->link_bandwidth = 2.0; /*default bg/q configuration */
        fprintf(stderr, "Link bandwidth not specified, setting to %lf\n",
                p->link_bandwidth);
    }

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    rc = configuration_get_value_int(&config, "PARAMS", "buffer_size", anno, &p->buffer_size);
    if(rc) {
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        p->buffer_size = 2048;
        fprintf(stderr, "Buffer size not specified, setting to %d",
                p->buffer_size);
    }

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    rc = configuration_get_value_int(&config, "PARAMS", "chunk_size", anno, &p->chunk_size);
    if(rc) {
        p->chunk_size = 128;
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        fprintf(stderr, "Warning: Chunk size not specified, setting to %d\n",
                p->chunk_size);
    }
        /* by default, we have one for taking packets,
         * another for taking credit*/
        p->num_vc = 1;

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    rc = configuration_get_value(&config, "PARAMS", "dim_length", anno,
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            dim_length_str, MAX_NAME_LENGTH);
    if (rc == 0){
        tw_error(TW_LOC, "couldn't read PARAMS:dim_length");
    }
    char* token;
    p->dim_length=malloc(p->n_dims*sizeof(*p->dim_length));
    token = strtok(dim_length_str, ",");
    i = 0;
    while(token != NULL)
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    {
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        sscanf(token, "%d", &p->dim_length[i]);
        if(p->dim_length[i] <= 0)
        {
            tw_error(TW_LOC, "Invalid torus dimension specified "
                    "(%d at pos %d), exiting... ", p->dim_length[i], i);
        }
        i++;
        token = strtok(NULL,",");
    }
    // create derived parameters
   
    // factor is an exclusive prefix product
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    p->router_delay = 50;
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    p->cn_delay = 10;
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    p->factor = malloc(p->n_dims * sizeof(int));
    p->factor[0] = 1;
    for(i = 1; i < p->n_dims; i++)
        p->factor[i] = p->factor[i-1] * p->dim_length[i-1];

    p->half_length = malloc(p->n_dims * sizeof(int));
    for (i = 0; i < p->n_dims; i++)
        p->half_length[i] = p->dim_length[i] / 2;

    // some latency numbers
    p->head_delay = (1.0 / p->link_bandwidth) * p->chunk_size;
    p->credit_delay = (1.0 / p->link_bandwidth) * p->chunk_size;
}

static void torus_configure(){
    anno_map = codes_mapping_get_lp_anno_map(LP_CONFIG_NM);
    assert(anno_map);
    num_params = anno_map->num_annos + (anno_map->has_unanno_lp > 0);
    all_params = malloc(num_params * sizeof(*all_params));

    for (uint64_t i = 0; i < anno_map->num_annos; i++){
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        const char * anno = anno_map->annotations[i].ptr;
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        torus_read_config(anno, &all_params[i]);
    }
    if (anno_map->has_unanno_lp > 0){
        torus_read_config(NULL, &all_params[anno_map->num_annos]);
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    }
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}

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/* helper functions - convert between flat ids and torus n-dimensional ids */
static void to_dim_id(
        int flat_id,
        int ndims,
        const int *dim_lens,
        int *out_dim_ids)
{
    for (int i = 0; i < ndims; i++) {
        out_dim_ids[i] = flat_id % dim_lens[i];
        flat_id /= dim_lens[i];
    }
}

static int to_flat_id(
        int ndims,
        const int *dim_lens,
        const int *dim_ids)
{
    int flat_id = dim_ids[0];
    int mult = dim_lens[0];
    for (int i = 1; i < ndims; i++) {
        flat_id += dim_ids[i] * mult;
        mult *= dim_lens[i];
    }
    return flat_id;
}

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void torus_collective_init(nodes_state * s,
           		   tw_lp * lp)
{
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    // TODO: be annotation-aware somehow 
    codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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    int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM, s->anno, 0);
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    int num_reps = codes_mapping_get_group_reps(grp_name);

    int i;
   /* handle collective operations by forming a tree of all the LPs */
   /* special condition for root of the tree */
   if( s->node_id == 0)
    {
        s->parent_node_id = -1;
        s->is_root = 1;
   }
   else
   {
       s->parent_node_id = (s->node_id - ((s->node_id - 1) % TREE_DEGREE)) / TREE_DEGREE;
       s->is_root = 0;
   }
   s->children = (tw_lpid*)malloc(TREE_DEGREE * sizeof(tw_lpid));

   /* set the isleaf to zero by default */
   s->is_leaf = 1;
   s->num_children = 0;

   /* calculate the children of the current node. If its a leaf, no need to set children,
      only set isleaf and break the loop*/

   for( i = 0; i < TREE_DEGREE; i++ )
    {
        tw_lpid next_child = (TREE_DEGREE * s->node_id) + i + 1;
        if(next_child < (num_lps * num_reps))
        {
            s->num_children++;
            s->is_leaf = 0;
            s->children[i] = next_child;
        }
        else
           s->children[i] = -1;
    }

#if TORUS_COLLECTIVE_DEBUG == 1
   printf("\n LP %ld parent node id ", s->node_id);

   for( i = 0; i < TREE_DEGREE; i++ )
        printf(" child node ID %ld ", s->children[i]);
   printf("\n");

   if(s->is_leaf)
        printf("\n LP %ld is leaf ", s->node_id);
#endif
}
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/* torus packet reverse event */
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static void torus_packet_event_rc(tw_lp *sender)
{
  codes_local_latency_reverse(sender);
  return;
}

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/* returns the torus message size */
static int torus_get_msg_sz(void)
{
   return sizeof(nodes_message);
}

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/* torus packet event , generates a torus packet on the compute node */
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static tw_stime torus_packet_event(
        model_net_request const * req,
        uint64_t message_offset,
        uint64_t packet_size,
        tw_stime offset,
        mn_sched_params const * sched_params,
        void const * remote_event,
        void const * self_event,
        tw_lp *sender,
        int is_last_pckt)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    nodes_message * msg;
    char* tmp_ptr;
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    xfer_to_nic_time = codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise */
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    //e_new = tw_event_new(local_nic_id, xfer_to_nic_time+offset, sender);
    //msg = tw_event_data(e_new);
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, TORUS, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, req->category);
    msg->final_dest_gid = req->final_dest_lp;
    msg->dest_lp = req->dest_mn_lp;
    msg->sender_svr= req->src_lp;
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    msg->sender_node = sender->gid;
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    msg->packet_size = packet_size;
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    msg->travel_start_time = tw_now(sender);
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    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
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    msg->chunk_id = 0;
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    msg->type = GENERATE;
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    msg->is_pull = req->is_pull;
    msg->pull_size = req->pull_size;

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    if(is_last_pckt) /* Its the last packet so pass in remote event information*/
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    {
        if(req->remote_event_size > 0)
        {
            msg->remote_event_size_bytes = req->remote_event_size;
            memcpy(tmp_ptr, remote_event, req->remote_event_size);
            tmp_ptr += req->remote_event_size;
        }
        if(req->self_event_size > 0)
        {
            msg->local_event_size_bytes = req->self_event_size;
            memcpy(tmp_ptr, self_event, req->self_event_size);
            tmp_ptr += req->self_event_size;
        }
        // printf("\n torus remote event %d local event %d last packet %d %lf ", msg->remote_event_size_bytes, msg->local_event_size_bytes, is_last_pckt, xfer_to_nic_time);
    }
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    tw_event_send(e_new);
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    return xfer_to_nic_time;
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}
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/*Sends a 8-byte credit back to the torus node LP that sent the message */
static void credit_send( nodes_state * s, 
	    tw_bf * bf, 
	    tw_lp * lp, 
	    nodes_message * msg,
            int sq)
{
    tw_event * e;
    nodes_message *m;
    tw_stime ts;

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    ts = (1.1 * g_tw_lookahead) + s->params->credit_delay + tw_rand_unif(lp->rng);
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    e = model_net_method_event_new(msg->sender_node, ts, lp, TORUS, 
        (void**)&m, NULL);
    if(sq == -1) {
        m->source_direction = msg->source_direction;
        m->source_dim = msg->source_dim;
    } else {
        m->source_direction = msg->saved_queue % 2;
        m->source_dim = msg->saved_queue / 2;
    }
    m->type = CREDIT;
    tw_event_send(e);
}
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/*Initialize the torus model, this initialization part is borrowed from Ning's torus model */
static void torus_init( nodes_state * s, 
	   tw_lp * lp )
{
    int i, j;
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    char anno[MAX_NAME_LENGTH];
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    rc_stack_create(&s->st);

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    codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL, &mapping_type_id, anno, &mapping_rep_id, &mapping_offset);
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    s->node_id = codes_mapping_get_lp_relative_id(lp->gid, 0, 0);

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    if (anno[0] == '\0'){
        s->anno = NULL;
        s->params = &all_params[num_params-1];
    }
    else{
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        s->anno = strdup(anno);
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        int id = configuration_get_annotation_index(anno, anno_map);
        s->params = &all_params[id];
    }
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    // shorthand
    const torus_param *p = s->params;
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    s->finished_chunks = 0;
    s->finished_packets = 0;

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    s->neighbour_minus_lpID = (int*)malloc(p->n_dims * sizeof(int));
    s->neighbour_plus_lpID = (int*)malloc(p->n_dims * sizeof(int));
    s->dim_position = (int*)malloc(p->n_dims * sizeof(int));
    s->buffer = (int**)malloc(2*p->n_dims * sizeof(int*));
    s->next_link_available_time = 
        (tw_stime**)malloc(2*p->n_dims * sizeof(tw_stime*));
    s->next_credit_available_time = 
        (tw_stime**)malloc(2*p->n_dims * sizeof(tw_stime*));
    s->next_flit_generate_time = 
        (tw_stime**)malloc(2*p->n_dims*sizeof(tw_stime*));

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    for(i=0; i < 2*p->n_dims; i++)
    {
        s->buffer[i] = (int*)malloc(p->num_vc * sizeof(int));
        s->next_link_available_time[i] =
                (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
        s->next_credit_available_time[i] = 
                (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
        s->next_flit_generate_time[i] = 
                (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
    }
    s->terminal_length = (int*)malloc(2*p->n_dims*sizeof(int));
    s->queued_length = (int*)malloc(2*p->n_dims*sizeof(int));
    s->terminal_msgs = 
        (nodes_message_list**)malloc(2*p->n_dims*sizeof(nodes_message_list*));
    s->terminal_msgs_tail = 
        (nodes_message_list**)malloc(2*p->n_dims*sizeof(nodes_message_list*));
    s->pending_msgs = 
        (nodes_message_list***)malloc(2*p->n_dims*sizeof(nodes_message_list**));
    s->pending_msgs_tail = 
        (nodes_message_list***)malloc(2*p->n_dims*sizeof(nodes_message_list**));
    s->queued_msgs = 
        (nodes_message_list***)malloc(2*p->n_dims*sizeof(nodes_message_list**));
    s->queued_msgs_tail = 
        (nodes_message_list***)malloc(2*p->n_dims*sizeof(nodes_message_list**));
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    s->busy_time = 
        (tw_stime*)malloc(2*p->n_dims*sizeof(tw_stime));
    s->last_buf_full = 
        (tw_stime*)malloc(2*p->n_dims*sizeof(tw_stime));

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    for(i = 0; i < 2*p->n_dims; i++) {
        s->pending_msgs[i] = 
            (nodes_message_list**)malloc(p->num_vc*sizeof(nodes_message_list*));
        s->pending_msgs_tail[i] = 
            (nodes_message_list**)malloc(p->num_vc*sizeof(nodes_message_list*));
        s->queued_msgs[i] = 
            (nodes_message_list**)malloc(p->num_vc*sizeof(nodes_message_list*));
        s->queued_msgs_tail[i] = 
            (nodes_message_list**)malloc(p->num_vc*sizeof(nodes_message_list*));
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    }
    s->other_msgs = 
        (nodes_message_list**)malloc(2*p->n_dims*sizeof(nodes_message_list*));
    s->other_msgs_tail = 
        (nodes_message_list**)malloc(2*p->n_dims*sizeof(nodes_message_list*));
    s->in_send_loop = 
        (int *)malloc(2*p->n_dims*sizeof(int));

    s->link_traffic = (int64_t *)malloc(2*p->n_dims*sizeof(int64_t));
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    s->total_data_sz = 0;

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    for(i=0; i < 2*p->n_dims; i++)
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    {
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	s->buffer[i] = (int*)malloc(p->num_vc * sizeof(int));
	s->next_link_available_time[i] =
            (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
	s->next_credit_available_time[i] = 
            (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
	s->next_flit_generate_time[i] = 
            (tw_stime*)malloc(p->num_vc * sizeof(tw_stime));
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        s->terminal_msgs[i] = NULL;
        s->terminal_msgs_tail[i] = NULL;
        s->other_msgs[i] = NULL;
        s->other_msgs_tail[i] = NULL;
        s->in_send_loop[i] = 0;
        s->terminal_length[i] = 0;
        s->queued_length[i] = 0;
        s->all_term_length = 0;
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        s->busy_time[i] = 0;
        s->last_buf_full[i] = 0;
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    }

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    // calculate my torus coords
    to_dim_id(codes_mapping_get_lp_relative_id(lp->gid, 0, 1),
            s->params->n_dims, s->params->dim_length, s->dim_position);
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    /* DEBUG */
    /*printf("%lu: my coords:", lp->gid);
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    for (i = 0; i < p->n_dims; i++)
        printf(" %d", s->dim_position[i]);
    printf("\n");
    */
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  int temp_dim_pos[ p->n_dims ];
  for ( i = 0; i < p->n_dims; i++ )
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    temp_dim_pos[ i ] = s->dim_position[ i ];

  // calculate minus neighbour's lpID
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  for ( j = 0; j < p->n_dims; j++ )
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    {
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      temp_dim_pos[ j ] = (s->dim_position[ j ] -1 + p->dim_length[ j ]) %
          p->dim_length[ j ];
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      s->neighbour_minus_lpID[j] =
          to_flat_id(p->n_dims, p->dim_length, temp_dim_pos);

      /* DEBUG
      printf(" minus neighbor: flat:%d lpid:%lu\n",
              s->neighbour_minus_lpID[j],
              codes_mapping_get_lpid_from_relative(s->neighbour_minus_lpID[j],
                      NULL, LP_CONFIG_NM, s->anno, 1));
      */

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      temp_dim_pos[ j ] = s->dim_position[ j ];
    }
  // calculate plus neighbour's lpID
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  for ( j = 0; j < p->n_dims; j++ )
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    {
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      temp_dim_pos[ j ] = ( s->dim_position[ j ] + 1 + p->dim_length[ j ]) %
          p->dim_length[ j ];
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      s->neighbour_plus_lpID[j] =
          to_flat_id(p->n_dims, p->dim_length, temp_dim_pos);

      /* DEBUG
      printf(" plus neighbor: flat:%d lpid:%lu\n",
              s->neighbour_plus_lpID[j],
              codes_mapping_get_lpid_from_relative(s->neighbour_plus_lpID[j],
                      NULL, LP_CONFIG_NM, s->anno, 1));
      */
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      temp_dim_pos[ j ] = s->dim_position[ j ];
    }

  //printf("\n");
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  for( j=0; j < 2 * p->n_dims; j++ )
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   {
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    for( i = 0; i < p->num_vc; i++ )
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     {
       s->buffer[ j ][ i ] = 0; 
       s->next_link_available_time[ j ][ i ] = 0.0;
       s->next_credit_available_time[j][i] = 0.0; 
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       s->pending_msgs[j][i] = NULL;
       s->pending_msgs_tail[j][i] = NULL;
       s->queued_msgs[j][i] = NULL;
       s->queued_msgs_tail[j][i] = NULL;
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     }
   }
  // record LP time
    s->packet_counter = 0;
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    torus_collective_init(s, lp);
}


/* collective operation for the torus network */
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void torus_collective(char const * category, int message_size, int remote_event_size, const void* remote_event, tw_lp* sender)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    nodes_message * msg;
    tw_lpid local_nic_id;
    char* tmp_ptr;

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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(sender->gid, grp_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &local_nic_id);
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    xfer_to_nic_time = g_tw_lookahead + codes_local_latency(sender);
    e_new = model_net_method_event_new(local_nic_id, xfer_to_nic_time,
            sender, TORUS, (void**)&msg, (void**)&tmp_ptr);

    msg->remote_event_size_bytes = message_size;
    strcpy(msg->category, category);
    msg->sender_svr=sender->gid;
    msg->type = T_COLLECTIVE_INIT;

    tmp_ptr = (char*)msg;
    tmp_ptr += torus_get_msg_sz();
    if(remote_event_size > 0)
     {
            msg->remote_event_size_bytes = remote_event_size;
            memcpy(tmp_ptr, remote_event, remote_event_size);
            tmp_ptr += remote_event_size;
     }

    tw_event_send(e_new);
    return;
}

/* reverse for collective operation of the dragonfly network */
void torus_collective_rc(int message_size, tw_lp* sender)
{
     codes_local_latency_reverse(sender);
     return;
}

static void send_remote_event(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
    // Trigger an event on receiving server
    if(msg->remote_event_size_bytes)
     {
            tw_event* e;
            tw_stime ts;
            nodes_message * m;
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            ts = (1/s->params->link_bandwidth) * msg->remote_event_size_bytes;
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            e = tw_event_new(s->origin_svr, ts, lp);
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            m = tw_event_data(e);
            char* tmp_ptr = (char*)msg;
            tmp_ptr += torus_get_msg_sz();
            memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
            tw_event_send(e);
     }
}

static void node_collective_init(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        tw_event * e_new;
        tw_lpid parent_nic_id;
        tw_stime xfer_to_nic_time;
        nodes_message * msg_new;
        int num_lps;

        msg->saved_collective_init_time = s->collective_init_time;
        s->collective_init_time = tw_now(lp);
	s->origin_svr = msg->sender_svr;
	
        if(s->is_leaf)
        {
            //printf("\n LP %ld sending message to parent %ld ", s->node_id, s->parent_node_id);
            /* get the global LP ID of the parent node */
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            // TODO: be annotation-aware
            codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL,
                    &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
            num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                    NULL, 1);
            codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
	    void* m_data;
	    e_new = model_net_method_event_new(parent_nic_id, xfer_to_nic_time,
            	lp, TORUS, (void**)&msg_new, (void**)&m_data);
	    	
            memcpy(msg_new, msg, sizeof(nodes_message));
	    if (msg->remote_event_size_bytes){
        	memcpy(m_data, model_net_method_get_edata(TORUS, msg),
                	msg->remote_event_size_bytes);
      	    }
	    
            msg_new->type = T_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            tw_event_send(e_new);
        }
        return;
}

static void node_collective_fan_in(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        int i;
        s->num_fan_nodes++;

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        // TODO: be annotation-aware
        codes_mapping_get_lp_info(lp->gid, grp_name, &mapping_grp_id, NULL,
                &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                NULL, 1);
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        tw_event* e_new;
        nodes_message * msg_new;
        tw_stime xfer_to_nic_time;

        bf->c1 = 0;
        bf->c2 = 0;

        /* if the number of fanned in nodes have completed at the current node then signal the parent */
        if((s->num_fan_nodes == s->num_children) && !s->is_root)
        {
            bf->c1 = 1;
            msg->saved_fan_nodes = s->num_fan_nodes-1;
            s->num_fan_nodes = 0;
            tw_lpid parent_nic_id;
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;

            /* get the global LP ID of the parent node */
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            codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
            //msg_new = tw_event_data(e_new);
	    void * m_data;
      	    e_new = model_net_method_event_new(parent_nic_id,
              xfer_to_nic_time,
              lp, TORUS, (void**)&msg_new, &m_data);
	    
            memcpy(msg_new, msg, sizeof(nodes_message));
            msg_new->type = T_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            if (msg->remote_event_size_bytes){
	        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
        	        msg->remote_event_size_bytes);
      	   }
            tw_event_send(e_new);
      }

      /* root node starts off with the fan-out phase */
      if(s->is_root && (s->num_fan_nodes == s->num_children))
      {
           bf->c2 = 1;
           msg->saved_fan_nodes = s->num_fan_nodes-1;
           s->num_fan_nodes = 0;
           send_remote_event(s, bf, msg, lp);

           for( i = 0; i < s->num_children; i++ )
           {
                tw_lpid child_nic_id;
                /* Do some computation and fan out immediate child nodes from the collective */
                xfer_to_nic_time = g_tw_lookahead + COLLECTIVE_COMPUTATION_DELAY + LEVEL_DELAY + tw_rand_exponential(lp->rng, (double)LEVEL_DELAY/50);

                /* get global LP ID of the child node */
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                codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                        s->children[i]/num_lps, (s->children[i] % num_lps),
                        &child_nic_id);
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                //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);

                //msg_new = tw_event_data(e_new);
                void * m_data;
	        e_new = model_net_method_event_new(child_nic_id,
                xfer_to_nic_time,
		lp, TORUS, (void**)&msg_new, &m_data);

		memcpy(msg_new, msg, sizeof(nodes_message));
	        if (msg->remote_event_size_bytes){
	                memcpy(m_data, model_net_method_get_edata(TORUS, msg),
        	               msg->remote_event_size_bytes);
      		}
		
                msg_new->type = T_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
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}
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static void node_collective_fan_out(nodes_state * s,
                        tw_bf * bf,
                        nodes_message * msg,
                        tw_lp * lp)
{
        int i;
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        //TODO: be annotation-aware
        int num_lps = codes_mapping_get_lp_count(grp_name, 1, LP_CONFIG_NM,
                NULL, 1);
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        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);
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        if(!s->is_leaf)
        {
            bf->c1 = 1;
            tw_event* e_new;
            nodes_message * msg_new;
            tw_stime xfer_to_nic_time;

           for( i = 0; i < s->num_children; i++ )
           {
                xfer_to_nic_time = g_tw_lookahead + TORUS_FAN_OUT_DELAY + tw_rand_exponential(lp->rng, (double)TORUS_FAN_OUT_DELAY/10);

                if(s->children[i] > 0)
                {
                        tw_lpid child_nic_id;

                        /* get global LP ID of the child node */
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                        codes_mapping_get_lp_id(grp_name, LP_CONFIG_NM, NULL, 1,
                                s->children[i]/num_lps,
                                (s->children[i] % num_lps), &child_nic_id);
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                        //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);
                        //msg_new = tw_event_data(e_new);
                        //memcpy(msg_new, msg, sizeof(nodes_message) + msg->remote_event_size_bytes);
			void* m_data;
			e_new = model_net_method_event_new(child_nic_id,
							xfer_to_nic_time,
					                lp, TORUS, (void**)&msg_new, &m_data);
		        memcpy(msg_new, msg, sizeof(nodes_message));
		        if (msg->remote_event_size_bytes){
			        memcpy(m_data, model_net_method_get_edata(TORUS, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = T_COLLECTIVE_FAN_OUT;
                        msg_new->sender_node = s->node_id;
                        tw_event_send(e_new);
                }
           }
         }
	//printf("\n Fan out phase completed %ld ", lp->gid);
        if(max_collective < tw_now(lp) - s->collective_init_time )
          {
              bf->c2 = 1;
              max_collective = tw_now(lp) - s->collective_init_time;
          }
}
    
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/*Returns the next neighbor to which the packet should be routed by using DOR (Taken from Ning's code of the torus model)*/
static void dimension_order_routing( nodes_state * s,
			     tw_lpid * dst_lp, 
			     int * dim, 
			     int * dir )
{
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     int dest[s->params->n_dims];
     int dest_id;
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  /* dummys - check later */
  *dim = -1;
  *dir = -1;

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  to_dim_id(codes_mapping_get_lp_relative_id(*dst_lp, 0, 1),
          s->params->n_dims, s->params->dim_length, dest);
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  for(int i = 0; i < s->params->n_dims; i++ )
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    {
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      if ( s->dim_position[ i ] - dest[ i ] > s->params->half_length[ i ] )
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	{
	  dest_id = s->neighbour_plus_lpID[ i ];
	  *dim = i;
	  *dir = 1;
	  break;
	}
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      if ( s->dim_position[ i ] - dest[ i ] < -s->params->half_length[ i ] )
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	{
	  dest_id = s->neighbour_minus_lpID[ i ];
	  *dim = i;
	  *dir = 0;
	  break;
	}
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      if ( ( s->dim_position[i] - dest[i] <= s->params->half_length[i] ) &&
              ( s->dim_position[ i ] - dest[ i ] > 0 ) )
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	{
	  dest_id = s->neighbour_minus_lpID[ i ];
	  *dim = i;
	  *dir = 0;
	  break;
	}
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      if (( s->dim_position[i] - dest[i] >= -s->params->half_length[i] ) &&
              ( s->dim_position[ i ] - dest[ i ] < 0) )
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	{
	  dest_id = s->neighbour_plus_lpID[ i ];
	  *dim = i;
	  *dir = 1;
	  break;
	}
    }
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  assert(*dim != -1 && *dir != -1);
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  *dst_lp = codes_mapping_get_lpid_from_relative(dest_id, NULL, LP_CONFIG_NM,
          s->anno, 1);
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}
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static void packet_generate( nodes_state * ns, 
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        tw_bf * bf, 
        nodes_message * msg, 
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        tw_lp * lp)
{
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    int j, tmp_dir=-1, tmp_dim=-1, queue, total_event_size;
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    tw_stime ts;
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    tw_event * e;
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    nodes_message *m;
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    tw_lpid intm_dst = msg->dest_lp;
    dimension_order_routing(ns, &intm_dst, &tmp_dim, &tmp_dir);
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    queue = tmp_dir + ( tmp_dim * 2 );
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    msg->packet_ID = ns->packet_counter;
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    msg->my_N_hop = 0;
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    if(lp->gid == TRACK && msg->packet_ID == TRACE)
        tw_output(lp, "\n packet generated %lld at lp %d dest %d final dest %d", 
        msg->packet_ID, (int)lp->gid, (int)intm_dst, (int)msg->dest_lp);
    
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    int num_chunks = msg->packet_size/ns->params->chunk_size;
    if(msg->packet_size % ns->params->chunk_size)
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        num_chunks++;
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    if(!num_chunks)
        num_chunks = 1;
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    ns->packet_counter++;
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    msg->source_direction = tmp_dir;
    msg->source_dim = tmp_dim;
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    msg->next_stop = intm_dst;
    msg->saved_queue = -1;
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    for(j = 0; j < num_chunks; j++) { 
        nodes_message_list * cur_chunk = (nodes_message_list *)malloc( 
                sizeof(nodes_message_list));
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        init_nodes_message_list(cur_chunk, msg);
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        if(msg->remote_event_size_bytes + msg->local_event_size_bytes > 0) {
            cur_chunk->event_data = (char*)malloc(
                msg->remote_event_size_bytes + msg->local_event_size_bytes);
        }
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        void *m_data_src = model_net_method_get_edata(TORUS, msg);
        if (msg->remote_event_size_bytes){
            memcpy(cur_chunk->event_data, m_data_src, msg->remote_event_size_bytes);
        }
        if (msg->local_event_size_bytes){
            m_data_src = (char*)m_data_src + msg->remote_event_size_bytes;
            memcpy((char*)cur_chunk->event_data + msg->remote_event_size_bytes, 
                m_data_src, msg->local_event_size_bytes);
        }
        cur_chunk->msg.chunk_id = j;
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        append_to_node_message_list(ns, ns->terminal_msgs,
            ns->terminal_msgs_tail, queue, cur_chunk);
        ns->terminal_length[queue] += ns->params->chunk_size;
        ns->all_term_length += ns->params->chunk_size;
    }
  
   if(ns->in_send_loop[queue] == 0) {
       bf->c8 = 1;
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       ts = codes_local_latency(lp) + ns->params->cn_delay * msg->packet_size;
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       e = model_net_method_event_new(lp->gid, ts, lp, TORUS, (void**)&m, NULL);
       m->type = SEND;
       m->source_direction = tmp_dir;
       m->source_dim = tmp_dim;
       ns->in_send_loop[queue] = 1;
       tw_event_send(e);
   }

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   /* record the statistics of the generated packets */
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   total_event_size = model_net_get_msg_sz(TORUS) + msg->remote_event_size_bytes + msg->local_event_size_bytes;   
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   mn_stats* stat;
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   stat = model_net_find_stats(msg->category, ns->torus_stats_array);
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   stat->send_count++;  
   stat->send_bytes += msg->packet_size;
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   stat->send_time += (1/ns->params->link_bandwidth) * msg->packet_size;
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   /* record the maximum ROSS event size */
   if(stat->max_event_size < total_event_size)
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	   stat->max_event_size = total_event_size;
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}
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   /* record the maximum ROSS event size */

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static void packet_generate_rc( nodes_state * s, 
		tw_bf * bf, 
		nodes_message * msg, 
		tw_lp * lp )
{
    s->packet_counter--;

    int j;
    int queue = msg->source_direction + (msg->source_dim * 2);

    uint64_t num_chunks = msg->packet_size/s->params->chunk_size;
    if(msg->packet_size % s->params->chunk_size)
       num_chunks++;

     if(!num_chunks)
        num_chunks = 1;
    
     for(j = 0; j < num_chunks; j++)
     {
       nodes_message_list* cur_entry = return_tail(s,
              s->terminal_msgs, s->terminal_msgs_tail, queue);
       s->terminal_length[queue] -= s->params->chunk_size;
       s->all_term_length -= s->params->chunk_size;
       delete_nodes_message_list(cur_entry);
     }

     if(bf->c8) {
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        codes_local_latency_reverse(lp);
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        s->in_send_loop[queue] = 0;
     }
     mn_stats* stat;
     stat = model_net_find_stats(msg->category, s->torus_stats_array);
     stat->send_count--; 
     stat->send_bytes -= msg->packet_size;
     stat->send_time -= (1/s->params->link_bandwidth) * msg->packet_size;
}

static void packet_send_rc(nodes_state * s,
        tw_bf * bf,
        nodes_message * msg,
        tw_lp * lp)
{
    int queue = msg->source_direction + (msg->source_dim * 2);

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    if(bf->c1 || bf->c4)
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    {
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        if(bf->c24)
        {
            s->last_buf_full[queue] = msg->saved_busy_time;
        }
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        s->in_send_loop[queue] = 1;
        return;
    }
     if(bf->c3) {
         s->buffer[queue][STATICQ] -= s->params->chunk_size;
     }
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     codes_local_latency_reverse(lp);
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     s->next_link_available_time[queue][0] = msg->saved_available_time;

     if(bf->c20)
     {
        s->link_traffic[queue] -= msg->packet_size % s->params->chunk_size;
     }

     if(bf->c21)
     {
        s->link_traffic[queue] -= s->params->chunk_size;
     }

     if(bf->c6)
     {
        codes_local_latency_reverse(lp);
     }

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     nodes_message_list * cur_entry = rc_stack_pop(s->st);
     assert(cur_entry);

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     if(bf->c31)
     {
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         prepend_to_node_message_list(s, s->terminal_msgs,
                  s->terminal_msgs_tail, queue, cur_entry); 
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        s->terminal_length[queue] += s->params->chunk_size;
        s->all_term_length += s->params->chunk_size;  
     }

     if(bf->c8)
     {
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        prepend_to_node_message_list(s, s->pending_msgs[queue],
                s->pending_msgs_tail[queue], STATICQ, cur_entry);
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     }

     if(bf->c9)
     {
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         codes_local_latency_reverse(lp);
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