/*
 * Copyright (C) 2015 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

/*
* The test program generates some synthetic traffic patterns for the model-net network models.
* currently it only support the dragonfly network model uniform random and nearest neighbor traffic patterns.
*/

#include "codes/model-net.h"
#include "codes/lp-io.h"
#include "codes/codes.h"
#include "codes/codes_mapping.h"
#include "codes/configuration.h"
#include "codes/lp-type-lookup.h"
#include "codes/net/dragonfly.h"

#define PAYLOAD_SZ 2048

static int net_id = 0;
static int traffic = 1;
static double arrival_time = 1000.0;

/* whether to pull instead of push */
static int num_servers_per_rep = 0;
static int num_routers_per_grp = 0;
static int num_nodes_per_grp = 0;
static int num_groups = 0;
static int num_nodes = 0;

static char lp_io_dir[256] = {'\0'};
static lp_io_handle io_handle;
static unsigned int lp_io_use_suffix = 0;
static int do_lp_io = 0;
static int num_msgs = 20;
static unsigned int sampling_interval = 800000;
static unsigned int sampling_end_time = 1600000;

typedef struct svr_msg svr_msg;
typedef struct svr_state svr_state;

/* global variables for codes mapping */
static char group_name[MAX_NAME_LENGTH];
static char lp_type_name[MAX_NAME_LENGTH];
static int group_index, lp_type_index, rep_id, offset;

/* type of events */
enum svr_event
{
    KICKOFF,	   /* kickoff event */
    REMOTE,        /* remote event */
    LOCAL      /* local event */
};

/* type of synthetic traffic */
enum TRAFFIC
{
	UNIFORM = 1, /* sends message to a randomly selected node */
	NEAREST_GROUP = 2, /* sends message to the node connected to the neighboring router */
	NEAREST_NEIGHBOR = 3 /* sends message to the next node (potentially connected to the same router) */
};

struct svr_state
{
    int msg_sent_count;   /* requests sent */
    int msg_recvd_count;  /* requests recvd */
    int local_recvd_count; /* number of local messages received */
    tw_stime start_ts;    /* time that we started sending requests */
    tw_stime end_ts;      /* time that we ended sending requests */
};

struct svr_msg
{
    enum svr_event svr_event_type;
    tw_lpid src;          /* source of this request or ack */
    int incremented_flag; /* helper for reverse computation */
};

static void svr_init(
    svr_state * ns,
    tw_lp * lp);
static void svr_event(
    svr_state * ns,
    tw_bf * b,
    svr_msg * m,
    tw_lp * lp);
static void svr_rev_event(
    svr_state * ns,
    tw_bf * b,
    svr_msg * m,
    tw_lp * lp);
static void svr_finalize(
    svr_state * ns,
    tw_lp * lp);

tw_lptype svr_lp = {
    (init_f) svr_init,
    (pre_run_f) NULL,
    (event_f) svr_event,
    (revent_f) svr_rev_event,
    (commit_f) NULL,
    (final_f)  svr_finalize,
    (map_f) codes_mapping,
    sizeof(svr_state),
};

void rb_svr_event_collect(svr_msg *m, tw_lp *lp, char *buffer)
{
    int type = (int) m->svr_event_type;
    memcpy(buffer, &type, sizeof(type));
    if(type < 0 || type > 3)
    {
        tw_event *cev = (tw_event*)(m - 1);
        char grp_name[64];
        char src_lp_type_name[64];
        char dest_lp_type_name[64];
        char ann[64];
        int grp_index, lp_type_idx, rid, offs;
        codes_mapping_get_lp_info(cev->send_lp, grp_name, &grp_index, src_lp_type_name,
                &lp_type_idx, ann, &rid, &offs);
        codes_mapping_get_lp_info(lp->gid, grp_name, &grp_index, dest_lp_type_name,
                &lp_type_idx, ann, &rid, &offs);
        printf("src: %s, dest: %s, recv_ts= %f, evtype: %d\n", src_lp_type_name, dest_lp_type_name, tw_now(lp), m->svr_event_type);
    }
}

st_event_collect svr_event_types[] = {
    {(rbev_col_f) rb_svr_event_collect,
     sizeof(int),
     (ev_col_f) rb_svr_event_collect,
     sizeof(int)},
    {0}
};

static const st_event_collect  *svr_get_event_type(void)
{
    return(&svr_event_types[0]);
}

void svr_register_evcol()
{
    ev_type_register("server", svr_get_event_type());
}

const tw_optdef app_opt [] =
{
        TWOPT_GROUP("Model net synthetic traffic " ),
    	TWOPT_UINT("traffic", traffic, "UNIFORM RANDOM=1, NEAREST NEIGHBOR=2 "),
    	TWOPT_UINT("num_messages", num_msgs, "Number of messages to be generated per terminal "),
    	TWOPT_UINT("sampling-interval", sampling_interval, "the sampling interval "),
    	TWOPT_UINT("sampling-end-time", sampling_end_time, "sampling end time "),
	    TWOPT_STIME("arrival_time", arrival_time, "INTER-ARRIVAL TIME"),
        TWOPT_CHAR("lp-io-dir", lp_io_dir, "Where to place io output (unspecified -> no output"),
        TWOPT_UINT("lp-io-use-suffix", lp_io_use_suffix, "Whether to append uniq suffix to lp-io directory (default 0)"),
        TWOPT_END()
};

const tw_lptype* svr_get_lp_type()
{
            return(&svr_lp);
}

static void svr_add_lp_type()
{
  lp_type_register("server", svr_get_lp_type());
}

static void issue_event(
    svr_state * ns,
    tw_lp * lp)
{
    tw_event *e;
    svr_msg *m;
    tw_stime kickoff_time;

    /* each server sends a dummy event to itself that will kick off the real
     * simulation
     */

    /* skew each kickoff event slightly to help avoid event ties later on */
    kickoff_time = 1.1 * g_tw_lookahead + tw_rand_exponential(lp->rng, arrival_time);

    e = tw_event_new(lp->gid, kickoff_time, lp);
    m = tw_event_data(e);
    m->svr_event_type = KICKOFF;
    tw_event_send(e);
}

static void svr_init(
    svr_state * ns,
    tw_lp * lp)
{
    ns->start_ts = 0.0;

    issue_event(ns, lp);
    return;
}

static void handle_kickoff_rev_event(
            svr_state * ns,
            tw_bf * b,
            svr_msg * m,
            tw_lp * lp)
{
    if(m->incremented_flag)
        return;

    if(b->c1)
        tw_rand_reverse_unif(lp->rng);

    model_net_event_rc(net_id, lp, PAYLOAD_SZ);
	ns->msg_sent_count--;
    tw_rand_reverse_unif(lp->rng);
}
static void handle_kickoff_event(
	    svr_state * ns,
	    tw_bf * b,
	    svr_msg * m,
	    tw_lp * lp)
{
    if(ns->msg_sent_count >= num_msgs)
    {
        m->incremented_flag = 1;
        return;
    }

    m->incremented_flag = 0;

    char anno[MAX_NAME_LENGTH];
    tw_lpid local_dest = -1, global_dest = -1;

    svr_msg * m_local = malloc(sizeof(svr_msg));
    svr_msg * m_remote = malloc(sizeof(svr_msg));

    m_local->svr_event_type = LOCAL;
    m_local->src = lp->gid;

    memcpy(m_remote, m_local, sizeof(svr_msg));
    m_remote->svr_event_type = REMOTE;

    assert(net_id == DRAGONFLY); /* only supported for dragonfly model right now. */
    ns->start_ts = tw_now(lp);
    codes_mapping_get_lp_info(lp->gid, group_name, &group_index, lp_type_name, &lp_type_index, anno, &rep_id, &offset);
    int local_id = codes_mapping_get_lp_relative_id(lp->gid, 0, 0);

   /* in case of uniform random traffic, send to a random destination. */
   if(traffic == UNIFORM)
   {
    b->c1 = 1;
   	local_dest = tw_rand_integer(lp->rng, 0, num_nodes - 1);
   }
   else if(traffic == NEAREST_GROUP)
   {
	local_dest = (local_id + num_nodes_per_grp) % num_nodes;
	//printf("\n LP %ld sending to %ld num nodes %d ", local_id, local_dest, num_nodes);
   }
   else if(traffic == NEAREST_NEIGHBOR)
   {
	local_dest =  (local_id + 1) % num_nodes;
//	 printf("\n LP %ld sending to %ld num nodes %d ", rep_id * 2 + offset, local_dest, num_nodes);
   }
   assert(local_dest < num_nodes);
//   codes_mapping_get_lp_id(group_name, lp_type_name, anno, 1, local_dest / num_servers_per_rep, local_dest % num_servers_per_rep, &global_dest);
   global_dest = codes_mapping_get_lpid_from_relative(local_dest, group_name, lp_type_name, NULL, 0);
   ns->msg_sent_count++;
   model_net_event(net_id, "test", global_dest, PAYLOAD_SZ, 0.0, sizeof(svr_msg), (const void*)m_remote, sizeof(svr_msg), (const void*)m_local, lp);

   issue_event(ns, lp);
   return;
}

static void handle_remote_rev_event(
            svr_state * ns,
            tw_bf * b,
            svr_msg * m,
            tw_lp * lp)
{
        ns->msg_recvd_count--;
}

static void handle_remote_event(
	    svr_state * ns,
	    tw_bf * b,
	    svr_msg * m,
	    tw_lp * lp)
{
	ns->msg_recvd_count++;
}

static void handle_local_rev_event(
                svr_state * ns,
                tw_bf * b,
                svr_msg * m,
                tw_lp * lp)
{
	ns->local_recvd_count--;
}

static void handle_local_event(
                svr_state * ns,
                tw_bf * b,
                svr_msg * m,
                tw_lp * lp)
{
    ns->local_recvd_count++;
}
/* convert ns to seconds */
static tw_stime ns_to_s(tw_stime ns)
{
    return(ns / (1000.0 * 1000.0 * 1000.0));
}

/* convert seconds to ns */
static tw_stime s_to_ns(tw_stime ns)
{
    return(ns * (1000.0 * 1000.0 * 1000.0));
}

static void svr_finalize(
    svr_state * ns,
    tw_lp * lp)
{
    ns->end_ts = tw_now(lp);

    printf("server %llu recvd %d bytes in %f seconds, %f MiB/s sent_count %d recvd_count %d local_count %d \n", (unsigned long long)lp->gid, PAYLOAD_SZ*ns->msg_recvd_count, ns_to_s(ns->end_ts-ns->start_ts),
        ((double)(PAYLOAD_SZ*ns->msg_sent_count)/(double)(1024*1024)/ns_to_s(ns->end_ts-ns->start_ts)), ns->msg_sent_count, ns->msg_recvd_count, ns->local_recvd_count);
    return;
}

static void svr_rev_event(
    svr_state * ns,
    tw_bf * b,
    svr_msg * m,
    tw_lp * lp)
{
    switch (m->svr_event_type)
    {
	case REMOTE:
		handle_remote_rev_event(ns, b, m, lp);
		break;
	case LOCAL:
		handle_local_rev_event(ns, b, m, lp);
		break;
	case KICKOFF:
		handle_kickoff_rev_event(ns, b, m, lp);
		break;
	default:
		assert(0);
		break;
    }
}

static void svr_event(
    svr_state * ns,
    tw_bf * b,
    svr_msg * m,
    tw_lp * lp)
{
   switch (m->svr_event_type)
    {
        case REMOTE:
            handle_remote_event(ns, b, m, lp);
            break;
        case LOCAL:
            handle_local_event(ns, b, m, lp);
            break;
	case KICKOFF:
	    handle_kickoff_event(ns, b, m, lp);
	    break;
        default:
            printf("\n Invalid message type %d ", m->svr_event_type);
            assert(0);
        break;
    }
}

int main(
    int argc,
    char **argv)
{
    int nprocs;
    int rank;
    int num_nets;
    int *net_ids;

    tw_opt_add(app_opt);
    tw_init(&argc, &argv);

    if(argc < 2)
    {
            printf("\n Usage: mpirun <args> --sync=2/3 mapping_file_name.conf (optional --nkp) ");
            MPI_Finalize();
            return 0;
    }

    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    configuration_load(argv[2], MPI_COMM_WORLD, &config);

    model_net_register();
    svr_add_lp_type();

    if (g_st_ev_rb_collect || g_st_ev_collect)
    {
        //dragonfly_register_evcol();
        //router_register_evcol();
        svr_register_evcol();
    }

    codes_mapping_setup();

    net_ids = model_net_configure(&num_nets);
    //assert(num_nets==1);
    net_id = *net_ids;
    free(net_ids);

    /* 5 days of simulation time */
    g_tw_ts_end = s_to_ns(5 * 24 * 60 * 60);
    model_net_enable_sampling(sampling_interval, sampling_end_time);

    if(net_id != DRAGONFLY)
    {
	printf("\n The test works with dragonfly model configuration only! ");
        MPI_Finalize();
        return 0;
    }
    num_servers_per_rep = codes_mapping_get_lp_count("MODELNET_GRP", 1, "server",
            NULL, 1);
    configuration_get_value_int(&config, "PARAMS", "num_routers", NULL, &num_routers_per_grp);

    num_groups = (num_routers_per_grp * (num_routers_per_grp/2) + 1);
    num_nodes = num_groups * num_routers_per_grp * (num_routers_per_grp / 2);
    num_nodes_per_grp = num_routers_per_grp * (num_routers_per_grp / 2);

    assert(num_nodes);

    if(lp_io_dir[0])
    {
        do_lp_io = 1;
        int flags = lp_io_use_suffix ? LP_IO_UNIQ_SUFFIX : 0;
        int ret = lp_io_prepare(lp_io_dir, flags, &io_handle, MPI_COMM_WORLD);
        assert(ret == 0 || !"lp_io_prepare failure");
    }
    tw_run();
    if (do_lp_io){
        int ret = lp_io_flush(io_handle, MPI_COMM_WORLD);
        assert(ret == 0 || !"lp_io_flush failure");
    }
    model_net_report_stats(net_id);
    tw_end();
    return 0;
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ft=c ts=8 sts=4 sw=4 expandtab
 */