#! /bin/sh
#
# Written by Craig Huff
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
## Return Value       Meaning
##      0             Ok to shut down
##      1             Something going on -- do not shut down

#
## Define a constant for the maximum amount of time difference, in seconds,
## that we want to allow between the current time and the time that zap2it
## suggested for the next database update. (5 minutes x 60 seconds)
margin=300


# Does mythshutdown say it is ok to shutdown?
/usr/bin/mythshutdown --check
result=$?	# returns 0 if mythshutdown has no reason to stay up

if [ $result -ne 0 ]; then	# if mythshutdown says to stay up, 
  exit $result			# we don't need to do any more checking.
fi

# Check for mythburn running and capture result of check
ps -ef|grep -v grep|grep mythburn >& /dev/null
# grep returns 0 if it found any matches
if [ $? -eq 0 ]; then	# if grep found any matches, stay up.
  exit 1		# we don't need to do any more checking.
fi

# Check if mythfilldatabase is supposed to run within ${margin} seconds from now
## First, get the time zap2it suggested as the next update time from the log
nexttime=`cat /var/log/mythtv/mythfilldatabase.log.1 /var/log/mythtv/mythfilldatabase.log | grep NextSuggestedTime | tail -1 | awk '{print $NF}' | sed -e 's/T/ /'`
## Convert it into the number of seconds since the "epoch"
epochtime=`date -u -d "${nexttime}" +%s`
## Next, get the current time in seconds since the "epoch"
thistime=`date +%s`
## If the time has not already passed AND we are close enough (<= ${margin}) then stay up
if [ ${epochtime} -gt ${thistime} ]; then
## Subtract the larger time from the smaller to get a positive difference
  difftime=`expr ${epochtime} - ${thistime}`
  if [ ${difftime} -le ${margin} ]; then
    exit 1
  fi
fi

#
# Check for mythfilldatabase running and capture result of check
pgrep mythfilldatabase >& /dev/null
# pgrep returns 0 if it found any jobs that match supplied criteria
if [ $? -eq 0 ]; then	# if pgrep found any jobs, stay up.
  exit 1		# we don't need to do any more checking.
fi

# Now, if there are any pseudo-terminals in use then do not shutdown
if [ `ps -ef | egrep "pts/[0-9]" | egrep -v egrep | wc -l` -ne 0 ]; then
  exit 1	# Stay up.
else
  exit 0	# Shut down.
fi