#!/bin/sh
###############################################################################
#                                                                             #
# This script generates the GRIB file for the NWW3 global or regional wave    #
# models. It is run as a child scipt interactively by the postprocessor.      #
#                                                                             #
# Remarks :                                                                   #
# - The necessary files are retrieved by the mother script.                   #
# - This script generates it own sub-directory 'grib'.                        # 
# - See section 0.b for variables that need to be set.                        # 
#                                                                             #
#                                                           September, 1999   #
#                                                                             #
###############################################################################
#
# --------------------------------------------------------------------------- #
# 0.  Preparations
# 0.a Basic modes of operation

  cd $DATA
  seton='-xa'
  setoff='+xa'
  set $seton
  postmsg "$jlogfile" "Making GRIB Files."

  rm -rf grib
  mkdir grib
  cd grib

# 0.b Define directories and the search path.
#     The tested variables should be exported by the postprocessor script.

  set $setoff
  echo ' '
  echo '+--------------------------------+'
  echo '!         Make GRIB files        |'
  echo '+--------------------------------+'
  echo "   Model ID         : $modID"
  set $seton

  if [ -z "$YMDH" ] || [ -z "$cycle" ] || [ -z "$EXECwave" ] || \
     [ -z "$COMOUT" ] || [ -z "$modID" ] || [ -z "$SENDCOM" ] || \
     [ -z "$dtgrib" ] || [ -z "$ngrib" ] || [ -z "$gribflags" ] || \
     [ -z "$GRIDNR" ] || [ -z "$MODNR" ]
  then
    set $setoff
    echo ' '
    echo '***************************************************'
    echo '*** EXPORTED VARIABLES IN postprocessor NOT SET ***'
    echo '***************************************************'
    echo ' '
    postmsg "$jlogfile" "EXPORTED VARIABLES IN postprocessor NOT SET"
    exit 1
    set $seton
  fi

# 0.c Starting time for output

  ymdh=$YMDH
  tstart="`echo $ymdh | cut -c1-8` `echo $ymdh | cut -c9-10`0000"

  set $setoff
  echo "   Starting time    : $tstart"
  echo "   Time step        : $dtgrib"
  echo "   Number of times  : $ngrib"
  echo "   GRIB field flags : $gribflags"
  echo ' '
  set $seton

# 0.d Links to working directory

  ln -s ../mod_def.ww3 .
  ln -s ../out_grd.ww3 .

# --------------------------------------------------------------------------- #
# 1.  Generate GRIB file with all data
# 1.a Generate input file for wavegrib
#     Template copied in mother script ...

  set $setoff
  echo "   Generate input file for wavegrib"
  set $seton

  sed -e "s/TIME/$tstart/g" \
      -e "s/DT/$dtgrib/g" \
      -e "s/NT/$ngrib/g" \
      -e "s/GRIDNR/$GRIDNR/g" \
      -e "s/MODNR/$MODNR/g" \
      -e "s/FLAGS/$gribflags/g" \
                               ../wavegrib.inp.tmpl > wavegrib.inp

# 1.b Run GRIB packing program

  set $setoff
  echo "   Run wavegrib"
  set $seton

  ln -s ../$modID.$cycle.grib gribfile
  $EXECwave/wavegrib
  err=$?

  if [ "$err" != '0' ]
  then
    set $setoff
    echo ' '
    echo '*************************************** '
    echo '*** FATAL ERROR : ERROR IN wavegrib *** '
    echo '*************************************** '
    echo ' '
    set $seton
    postmsg "$jlogfile" "FATAL ERROR : ERROR IN wavegrib"
    exit 3
  fi

# 1.c CLean up

  rm -f wavegrib.inp
  rm -f mod_def.ww3
  rm -f out_grd.ww3

# 1.d Save in /com

  ##########################
  # Convert to grib2 format
  ##########################
  /nwprod/util/exec/cnvgrib -g12 -p40 gribfile gribfile.grib2
  /nwprod/util/exec/wgrib2 gribfile.grib2 -s >gribfile.grib2.idx

  if [ "$SENDCOM" = 'YES' ]
  then
    set $setoff
    echo "   Saving GRIB file as $COMOUT/$modID.$cycle.grib"
    set $seton
    cp gribfile $COMOUT/$modID.$cycle.grib
    cp gribfile.grib2 $COMOUT/$modID.$cycle.grib.grib2
    cp gribfile.grib2.idx $COMOUT/$modID.$cycle.grib.grib2.idx
    echo done >$COMOUT/$modID.$cycle.gribdone

  # 1.e DBN Alert the file to ncodas 

    if [ "$SENDDBN" = 'YES' ]
    then
      set $setoff
      echo "   Alerting GRIB file as $COMOUT/$modID.$cycle.grib"
      set $seton
      $DBNROOT/bin/dbn_alert MODEL WAVE_GRIB $job $COMOUT/$modID.$cycle.grib
      if [ $SENDDBN_GB2 = YES ]
        then
        $DBNROOT/bin/dbn_alert MODEL WAVE_GRIB_GB2 $job $COMOUT/$modID.$cycle.grib.grib2
        $DBNROOT/bin/dbn_alert MODEL WAVE_GRIB_GB2_WIDX $job $COMOUT/$modID.$cycle.grib.grib2.idx
      fi
    fi 
  fi

# --------------------------------------------------------------------------- #
# 3.  Clean up the directory

  set $setoff
  echo "   Removing work directory after success."
  set $seton

  cd ..
  rm -rf grib

  set $setoff
  echo ' '
  echo "End of wavegrib.sh at"
  date

# End of wavegrib.sh -------------------------------------------------------- #