#!/bin/sh

# Exit status codes:
#   0 =  Version reported correctly
#   1 =  Error

TWS_TIMEOUT="15"

if ! test -e "$1"; then
	echo "Usage:   $0 <sh>" 1>&2
	echo "Example: $0 $HOME/.tws_scripts/tws-latest-standalone-linux-x64.sh" 1>&2
	exit 1
fi

ARG1="$(readlink -v -f "$1")" || exit 1

TDIR="$(mktemp -d -t twsdir.XXXX)" || exit 1
trap "rm -rf ${TDIR}" exit
cd "${TDIR}" || exit 1

# Clean up installation directories if required and install new version
rm -rf $HOME/.install4j $HOME/.i4j_jres $HOME/tws
chmod +x ${ARG1}
${ARG1} -q &> /dev/null

TWS_HOME="${TDIR}/twshome"
mkdir "${TWS_HOME}" || exit 1
LOG="${TWS_HOME}/launcher.log"

TWS_CP=`find ${HOME}/tws/jars -type f -name \*.jar -printf '%p:'`
/usr/sbin/xvfb-run -n 99 /usr/lib/jvm/java-8-openjdk/jre/bin/java -cp "${TWS_CP}" jclient.LoginFrame "${TWS_HOME}" &
disown
TWS_PID="$!"

# Wait for TWS JVM to start writing to $LOG
while [ ! -f $LOG ]; do
  inotifywait -q -q -t 10 -e create --format '%f' $TWS_HOME
  if [ $? -eq 2 ] && [ ! -f $LOG ]; then
    echo "Error: $LOG not found"
    exit 1
  fi
done

# Wait for $LOG to contain version ("Build") line
for count in {0..10}; do
  grep -q ' - Build' $LOG
  if [ $? -eq 0 ]; then
    break
  fi
  sleep 1
done

# Kill process now that version line or timeout was reached
/usr/bin/kill --verbose --timeout 1000 TERM --timeout 1000 KILL --signal INT $TWS_PID &>/dev/null

# Clean up ready for next run
rm -rf $HOME/.install4j $HOME/.i4j_jres $HOME/tws

# Extract version line from log now the JVM has exited
VERSION_LINE=$(grep -m1 ' - Build' $LOG)
if [ $? -eq 0 ]; then
  echo "${VERSION_LINE}" |sed -e 's/.*Build //1' -e 's/,.*//1'
  exit 0
fi

echo "could not grep version string; final log appears below" 1>&2
cat $LOG 1>&2
exit 1