#!/bin/bash
DEFAULT_LOOPBACK_BANDWIDTH="498000000"
DEFAULT_LOOPBACK_LATENCY="0.000004"
DEFAULT_NETWORK_BANDWIDTH="$((26 * 1024 * 1024))"
DEFAULT_NETWORK_LATENCY="0.000005"
DEFAULT_NUMPROCS="4"
DEFAULT_POWER="100"

LOOPBACK_BANDWIDTH="${DEFAULT_LOOPBACK_BANDWIDTH}"
LOOPBACK_LATENCY="${DEFAULT_LOOPBACK_LATENCY}"
NETWORK_BANDWIDTH="${DEFAULT_NETWORK_BANDWIDTH}"
NETWORK_LATENCY="${DEFAULT_NETWORK_LATENCY}"
NUMPROCS="${DEFAULT_NUMPROCS}"
POWER="${DEFAULT_POWER}"

while true; do
  case "$1" in
   "-np" | "-n")
      NUMPROCS="$2"
      shift 2
    ;;
   "-bandwidth")
      NETWORK_BANDWIDTH="$2"
      shift 2
    ;;
   "-latency")
      NETWORK_LATENCY="$2"
      shift 2
    ;;
   "-platform")
	PLATFORM="$2"
      if [ ! -f ${PLATFORM} ]; then
		echo "[$0] ** error: the file '${PLATFORM}' does not exist. Aborting."
		exit 1
      fi
	shift 2
    ;;
   "-hostfile")
	HOSTFILE="$2"
      if [ ! -f ${HOSTFILE} ]; then
		echo "[$0] ** error: the file '${HOSTFILE}' does not exist. Aborting."
		exit 1
      fi
	shift 2
    ;;

   "-map")
	MAPOPT="true"
      shift 1
   ;;

   "-keep-temps")
	KEEP="true"
      shift 1
   ;;

   "-help" | "--help" | "-h")
      echo "usage:"
      echo "$0 [-quiet] [-keep-temps] [-np <numprocs>] -platform <xmldesc> -hostfile <hostfile> [-map] program [program-options]"
      echo "or (deprecated usage):"
      echo "$0 [-quiet] [-keep-temps] [-np <numprocs>] [-bandwidth <bytes/sec>] [-latency <secs>] program [program-options]"
      echo
      exit
   ;;

   "--cfg="*|"--log="*)
     for OPT in ${1#*=}
     do
       SIMOPTS="$SIMOPTS ${1%%=*}=$OPT"
     done
     shift 1
   ;;
    *)
      break
    ;;
  esac
done

EXEC="$1"
shift

##-----------------------------------




##-------------------------------- DEFAULT or SPECIFIED PLATFORM --------------------------------------
if [ -z "${PLATFORM}" ]; then
	PLATFORMTMP="$(mktemp tmpXXXXXX)"

	cat > ${PLATFORMTMP} <<PLATFORMHEAD
<?xml version='1.0'?>
<!DOCTYPE platform SYSTEM "simgrid.dtd">
<platform version="2">
PLATFORMHEAD

for (( i=${NUMPROCS}; $i ; i=$i-1 )) do
  echo "  <host id=\"host$i\" power=\"${POWER}\"/>" >> ${PLATFORMTMP}
  echo "  <link id=\"loop$i\" bandwidth=\"${LOOPBACK_BANDWIDTH}\" latency=\"${LOOPBACK_LATENCY}\"/>" >> ${PLATFORMTMP}
  echo "  <link id=\"link$i\" bandwidth=\"${NETWORK_BANDWIDTH}\" latency=\"${NETWORK_LATENCY}\"/>" >> ${PLATFORMTMP}
done

for (( i=${NUMPROCS}; $i ; i=$i-1 )) do
  for (( j=${NUMPROCS}; $j ; j=$j-1 )) do
    if [ $i -eq $j ]; then
      echo "  <route src=\"host$i\" dst=\"host$j\"><link:ctn id=\"loop$i\"/></route>" >> ${PLATFORMTMP}
    else
      echo "  <route src=\"host$i\" dst=\"host$j\"><link:ctn id=\"link$i\"/><link:ctn id=\"link$j\"/></route>" >> ${PLATFORMTMP}
    fi
  done
done

cat >> ${PLATFORMTMP} <<PLATFORMFOOT
</platform>
PLATFORMFOOT

else
	PLATFORMTMP=${PLATFORM}
fi
##-------------------------------- end DEFAULT or SPECIFIED PLATFORM --------------------------------------

##-------------------------------- DEFAULT APPLICATION --------------------------------------
APPLICATIONTMP="$(mktemp tmpXXXXXX)"
#APPLICATIONTMP="app.xml"


cat > ${APPLICATIONTMP} <<APPLICATIONHEAD
<?xml version='1.0'?>
<!DOCTYPE platform SYSTEM "simgrid.dtd">
<platform version="2">
APPLICATIONHEAD

##---- cache hostnames of hostfile---------------
if [ -n "${HOSTFILE}" ] && [ -f ${HOSTFILE} ]; then
	hostnames=(`cat ${HOSTFILE} | tr \\\n " "`)
      NUMHOSTS=`cat ${HOSTFILE} | wc -l`
fi

##----------------------------------------------------------
##  generate application.xml with hostnames from hostfile:
##  the name of host_i (1<=i<=p, where -np p) is the line i
##  in hostfile (where -hostfile hostfile), or "host$i" if
##  hostfile has less than i lines.
##----------------------------------------------------------

HAVE_SEQ="`which seq 2>/dev/null`"

if [ -n "${HAVE_SEQ}" ]; then
	SEQ=`${HAVE_SEQ} 0 $((${NUMPROCS}-1))`
else
      cnt=0
	while (( $cnt < ${NUMPROCS} )) ; do
	    SEQ="$SEQ $cnt"
	    cnt=$((cnt + 1));
	done
fi

##---- generate <process> tags------------------------------

for i in ${SEQ}
do
  if [ -n "${HOSTFILE}" ]; then
	j=$(( $i % ${NUMHOSTS} ))
  fi
  ##---- optional display of ranks to process mapping
  if [ -n "${MAPOPT}" ]; then
	echo "[rank $i] -> ${hostnames[$j]}"
  fi

  if [ -z "${hostnames[$j]}" ]; then
	host="host"$(($j+1))
  else
	host="${hostnames[$j]}"
  fi
  echo "  <process host=\"${host}\" function=\"smpi_simulated_main\">" >> ${APPLICATIONTMP}
  echo "    <argument value=\"$i\"/> <!-- rank -->" >> ${APPLICATIONTMP}
  for ARG in $*; do
    echo "    <argument value=\"${ARG}\"/>" >> ${APPLICATIONTMP}
  done
  echo "  </process>" >> ${APPLICATIONTMP}
done

cat >> ${APPLICATIONTMP} <<APPLICATIONFOOT
</platform>
APPLICATIONFOOT
##-------------------------------- end DEFAULT APPLICATION --------------------------------------

if [ -n "${KEEP}" ] ; then
  echo ${EXEC} ${SIMOPTS} ${PLATFORMTMP} ${APPLICATIONTMP}
fi
${EXEC} ${SIMOPTS} ${PLATFORMTMP} ${APPLICATIONTMP}

if [ -z "${KEEP}" ] ; then
   if [ -z "${PLATFORM}" ]; then
	rm ${PLATFORMTMP}
   fi
   rm ${APPLICATIONTMP}
fi