#!/bin/ksh

# Make sure we are using GMT time zone for time computations
export TZ="GMT"

# Set up paths to system commands
MKDIR=/bin/mkdir
LN=/bin/ln
ECHO=/bin/echo
RM=/bin/rm
CAT=/bin/cat
CUT=/bin/cut
TR=/usr/bin/tr
DATE=/bin/date
TAIL=/usr/bin/tail
SORT="/bin/sort -n"
#WGRIB="/share/home/01033/harrop/wgrib/wgrib"
#WGRIB="/work/01033/harrop/wgrib/wgrib"
WGRIB=/opt/grads/2.0.a2/bin/wgrib
WC=/usr/bin/wc
UNIQ=/usr/bin/uniq
AWK=/bin/awk
GRIBTAB=''

# Set up arrays of fields and corresponding levels needed
set -A fields \
       HGT    \
       UGRD   \
       UGRD   \
       UGRD   \
       UGRD   \
       UGRD   \
       VGRD   \
       VGRD   \
       VGRD   \
       VGRD   \
       VGRD   \
       TMP    \
       ACPCP  \
       NCPCP  \
       MSLMA

set -A levels \
       "500 mb" \
       "850 mb" \
       "700 mb" \
       "250 mb" \
       "200 mb" \
       "hybrid lev 1" \
       "850 mb" \
       "700 mb" \
       "250 mb" \
       "200 mb" \
       "hybrid lev 1" \
       "700 mb" \
       "sfc"    \
       "sfc"    \
       "MSL"

# Set up paths to executables
GRBINDEX=${TRACKER}/bin/grbindex
GETTRK=${TRACKER}/bin/gettrk

# Set up the work directory and cd into it
workdir=${FIM_HOME}/FIMrun/fim_${GLVL}_${NVL}_${PES}_${yyyymmddhhmm}/tracker_${MEMBER_ID}/${T}
${RM} -rf ${workdir}
${MKDIR} -p ${workdir}
cd ${workdir}

# Extract initialization time components
YYYY=`${ECHO} ${yyyymmddhhmm} | ${CUT} -c1-4`
MM=`${ECHO} ${yyyymmddhhmm} | ${CUT} -c5-6`
DD=`${ECHO} ${yyyymmddhhmm} | ${CUT} -c7-8`
HH=`${ECHO} ${yyyymmddhhmm} | ${CUT} -c9-10`
YY=`${DATE} -u +%y -d "${MM}/${DD}/${YYYY}"`
JJJ=`${DATE} -u +%j -d "${MM}/${DD}/${YYYY}"`

# Generate the ATCFNAME for this member
ATCFNAME=`echo ${ATCFNAME} | sed "s/NN/${MEMBER_ID}/"`

# Extract fields needed by tracker for each output time and concatenate them together to produce a big forecast file
fcst_file=./${yyyymmddhhmm}.grib.${ATCFNAME}
rm -f ${fcst_file}
typeset -Z4 fcst
fcst=0
while [ ${fcst} -le ${T} ]; do

  # Get name of the post file
  postfile=${FIM_HOME}/FIMrun/fim_${GLVL}_${NVL}_${PES}_${yyyymmddhhmm}/post_${MEMBER_ID}/fim/NAT/grib1/${YY}${JJJ}${HH}00${fcst}

  # Extract fields from the post file and append them to the fcst_file
  ${WGRIB} -v ${postfile} | egrep "(HGT:500 mb|UGRD:500 mb|UGRD:850 mb|UGRD:700 mb|UGRD:250 mb|UGRD:200 mb|UGRD:hybrid lev 1:|VGRD:500 mb|VGRD:850 mb|VGRD:700 mb|VGRD:250 mb|VGRD:200 mb|VGRD:hybrid lev 1:|TMP:700 mb|ACPCP:sfc|NCPCP:sfc|MSLMA:MSL)" | ${WGRIB} -i ${postfile} -append -grib -o ${fcst_file}

  (( fcst = ${fcst} + ${FCST_INTERVAL} ))
  
done

# Run grbindex to get a grib index file
${GRBINDEX} ${fcst_file} ${fcst_file}.ix

# Extract the tcvital record
#tcvital=${TCVITALS}/syndat_tcvitals.${YYYY}
#tcvital=${TCVITALS}/${yyyymmddhhmm}.tcvitals
#tcvital=${TCVITALS}/tcvitals.${yyyymmddhhmm}*
tcvital=${TCVITALS}/tcvitals.${YYYY}${MM}${DD}${HH}.txt
${CAT} ${tcvital} | grep "${YYYY}${MM}${DD} ${HH}00" | ${SORT} | ${UNIQ} > tcvital.txt

# Create link for output track
${LN} -s track.${yyyymmddhhmm}.${ATCFNAME} fort.64

# Determine the length of the forecast
fcst_length=`${WGRIB} ${fcst_file} | ${CUT} -d":" -f 9 | ${CUT} -d"=" -f 2 | ${SORT} | ${TAIL} -1`

# Generate a list of forecast times to process based on what's in the input grib file
i=0
while [ ${i} -lt 65 ]; do
  (( fcst = i * 6 ))
  if [ ${fcst} -gt ${fcst_length} ]; then 
    itmphrs[i]=99
  else
    itmphrs[i]=${fcst}
  fi
  (( i=i+1 ))
done

# Generate stswitch based on how many storms there are in the tcvital file
nstorms=`${CAT} tcvital.txt | ${AWK} '{print $2}' | ${SORT} | ${UNIQ} | ${WC} -l`

i=0
while [ ${i} -lt 15 ]; do
  if [ ${i} -lt ${nstorms} ]; then
    stswitch[i]=1
  else
    stswitch[i]=3
  fi
  (( i=i+1 ))
done

# Generate the namelist
${CAT} <<EOF > namelist
&datein 
  inp%byy=${YY},
  inp%bmm=${MM},
  inp%bdd=${DD},
  inp%bhh=${HH}, 
  inp%model=7
/
&stormlist
  stswitch = ${stswitch[*]}
/
&fhlist 
  itmphrs = ${itmphrs[*]}
/
&atcfinfo 
  atcfnum=81,
  atcfname='${ATCFNAME}',
  atcfymdh=${YYYY}${MM}${DD}${HH}
/
&phaseinfo 
  phaseflag='n',
  phasescheme='cps'
/
&structinfo
  structflag='n',
  ikeflag='n'
/

EOF

# Create an empty track file
touch track.${yyyymmddhhmm}.${ATCFNAME}

# Run gettrk
${RM} -f fort.11
${RM} -f fort.12
${RM} -f fort.31
${LN} -s ${fcst_file} fort.11
${LN} -s ${fcst_file}.ix fort.31
${LN} -s tcvital.txt fort.12
${GETTRK} < namelist
error=$?
if [ ${error} -ne 0 ]; then
  ${ECHO} "ERROR: ${GETTRK} crashed  Exit status=${error}"
  exit ${error}
fi

# Create individual track files for each storm
stormids=`${CAT} track.${yyyymmddhhmm}.${ATCFNAME} | ${AWK} '{print $1 $2}' | ${TR} -d , | ${SORT} | ${UNIQ}`
${ECHO} $stormids
for storm in ${stormids[*]}; do
  area=`${ECHO} ${storm} | ${CUT} -c1-2`
  num=`${ECHO} ${storm} | ${CUT} -c3-4`
  ${AWK} "/${area}, ${num}/" track.${yyyymmddhhmm}.${ATCFNAME} > ${area}${num}-${yyyymmddhhmm}.tracker.${ATCFNAME}
done

exit 0