#!/usr/bin/ksh

set -vx # JCET mod

# Note to users: This script is intended to aid you with retrieving USNO
# EOP data from our primary server, or, if our primary server is unavailable
# for a defined amount of time, our back-up server in Flagstaff, Arizona.

# The script will check the primary site for 30 minutes for new data.  If,
# after that amount of time, the file time stamp has not changed, the script
# will begin to check the secondary site as well.  If there is an update,
# the script will quietly terminate.  
# The script can be set to check the status of files some time later during
# the day to see if the files you wish to retrieve have been updated.

typeset RC=0
typeset COUNT=1
typeset idone=0

# Define wget path
WGETPATH=/usr/bin/


# Define file variables that exist locally
# This can be called whatever you wish
MYFINALSDAILY=finals2000A.daily.local
# Define file variables you wish to download.
# The names should correspond to how they are named on the server.
FINALSDAILY=finals2000A.daily

# Open and timestamp a log
exec >> ${ARCHIVE}getusnolog-$(date +%Y-%m-%d) 2>&1

# Get current date in MMMDYYYY format
today=$(date +%m/%d/%Y)
echo $today

# Get user's locale 12-hour clock time
hour=$(date +%r)

# E-mail declarations
# Declare your e-mail address here if you wish to be notified by e-mail
# when new data is available.

# Declare variables for primary and secondary ftp sites
maia=primary
toshi=secondary

# Compare file time stamps of local file and the one downloaded from the server.

function check_timestamp {
       
        file1time=$(stat -c %Y $MYFINALSDAILY)
        file2time=$(stat -c %Y $FINALSDAILY)

        #(( diff = $file1time - $file2time ))
        (( diff = $file2time - $file1time ))

        #if (( "$diff" < 0 )) ; then
        if (( "$diff" > 43200 )) ; then
        # if local file is older than server file...
        # server file has been updated
        # if frc=0, it means that the server file is new
             frc=0
        else
             frc=1
        fi

	return $frc
}

# Check primary ftp site for 30 minutes
while [[ $COUNT -le 360 && $idone -ne 1 ]];
do
	### maia.usno.navy.mil
	newer=$(${WGETPATH}wget -N --tries=5 --timeout=180 ftp://maia.usno.navy.mil/ser7/${FINALSDAILY} 2>&1)
        echo $newer
	check_timestamp
	if [ $frc -eq 0 ] ; then
        # if primary site has been updated within the 30 minute time frame
        # it is OK to exit
                idone=1
		if ((`echo $newer | grep -c "Remote file is newer"` > 0 )) ; then
                	datamsg="On $today, at $(date +%r), new data was retrieved from $maia site."
                	echo $datamsg | mailx -s "USNO EOP DATA UPDATE" $emaillist
                        mv $FINALSDAILY $MYFINALSDAILY                                              #  JCET mod
                fi
	fi

	let COUNT=COUNT+1
        # sleep 5 seconds between each download attempt
        sleep 5
done

# Now begin to check both maia and toshi for a minimum of two and a half hours
# Also e-mail user if there has been an update to the file

# Reset the counter.
let COUNT=0
while [[ $idone -eq 0 && $COUNT -le 900 ]];
do
	### maia.usno.navy.mil
	newer=$(${WGETPATH}wget -N --tries=5 --timeout=180 ftp://maia.usno.navy.mil/ser7/${FINALSDAILY} 2>&1)
        echo $newer
	check_timestamp
	if [ $frc -eq 0 ] ; then
               idone=1
	       if ((`echo $newer | grep -c "Remote file is newer"` > 0 )) ; then
               # E-mail user that new data was retrieved
               		datamsg="On $today, at $(date +%r), new data was retrieved from $maia site."
               		echo $datamsg | mailx -s "USNO EOP DATA UPDATE" $emaillist
                        mv $FINALSDAILY $MYFINALSDAILY                                              #  JCET mod
                fi
	fi
	### toshi.nofs.navy.mil 
	newer=$(${WGETPATH}wget -N --tries=5 --timeout=180 ftp://toshi.nofs.navy.mil/ser7/${FINALSDAILY} 2>&1)
	check_timestamp
        echo $newer
	if [ $frc -eq 0  ] ; then
               idone=1
	       if ((`echo $newer | grep -c "Remote file is newer"` > 0 )) ; then
               # E-mail user that new data was retrieved
               		datamsg="On $today, at $(date +%r), new data was retrieved from $toshi site."
               		echo $datamsg | mailx -s "USNO EOP DATA UPDATE" $emaillist
                        mv $FINALSDAILY $MYFINALSDAILY                                              #  JCET mod
                fi
	fi

       let COUNT=COUNT+1
       if [ $COUNT -gt 900 ] ; then
		datamsg="On $today, there were no additional updates to the files on neither the $maia site nor $toshi site."
       		echo $datamsg | mailx -s "No USNO EOP data update" $emaillist

       fi
                # sleep 10 seconds between each download attempt
       sleep 10

done

echo "Finished"