#!/bin/sh
#
# This script will maintain a current, local copy of SEED metadata
# from the IRIS DMC FTP site.  The only base requirements are the
# following programs: 'wget', 'ls' and 'mailx' (only if mail
# notification is desired).  The idea would to run this as a cron
# job, e.g. once a day, to keep local metadata up to date.
#
# Further extension is certainly possible, for example some other
# process could be started whenever an update is received; see the
# note below in the 'for' loop.
#
# 2006.3.1 - IRIS DMC - CT

# Space separated list of networks for which to retrieve SEED metadata
NETWORKS="TA _US-BB"

# Destination directory for all downloaded SEED
DESTDIR=metadata

# Path to wget or just 'wget' if it's in the current path
WGET=wget

# Optionally set an email address for notification of updates
#EMAIL=user@university.edu



# Check for destination directory and try to create it if needed
if [ ! -d $DESTDIR ]; then
  echo "Creating destination directory $DESTDIR"
  mkdir -p $DESTDIR
  if [ ! -d $DESTDIR ]; then
    echo "Cannot create destination directory, cannot continue."
  fi
fi

NETUPDATES=""

# Loop through the network codes
for NETCODE in $NETWORKS
do
  echo "Checking dataless SEED for $NETCODE"

  LSLBEFORE=`ls -l $DESTDIR/$NETCODE.dataless 2>/dev/null`
  $WGET -q -N -P $DESTDIR "ftp://ftp.iris.washington.edu/pub/RESPONSES/DATALESS_SEEDS/$NETCODE.dataless"
  LSLAFTER=`ls -l $DESTDIR/$NETCODE.dataless 2>/dev/null`

  if [ "$LSLBEFORE" != "$LSLAFTER" ]; then
    echo "Updated SEED metadata for $NETCODE network"
    NETUPDATES="${NETUPDATES}${NETCODE} "

    # This would be the right place add some processing of updated files.
    # For example, running rdseed to produce RESP:
    #rdseed -f $DESTDIR/$NETCODE.dataless -q RESP -R > /dev/null 2>&1

  else
    echo "Did not update SEED metadata for $NETCODE network"
  fi

done

# Send email about updates if EMAIL was specified and something was updated
if [ "$EMAIL" != "" ]; then
  if [ "$NETUPDATES" != "" ]; then
    echo "Sending mail to $EMAIL"
    echo "Updated SEED metadata from DMC for: $NETUPDATES" | mailx -s "RefreshMetadata: $NETUPDATES" $EMAIL
  fi
fi

echo "Done refreshing SEED metadata"