#!/bin/bash

SNAME="Policy Management"
PNAME=policy-management
CLASS=org.openecomp.policy.drools.system.Main


function start() {
	um_start
	if [[ ${RETVAL} != 0 ]]; then
		update_monitor off
	else
		update_monitor on
	fi	
}

# unmonitored start, does not change monitor status (immutable)
function um_start() {
    status
    if [ "$_RUNNING" = "1" ]; then
      echo $_STATUS
      RETVAL=0
      return
    fi
    mkdir -p $_DIR/logs
    if [ -e $_DIR/logs/$PNAME.out.1 ]; then mv $_DIR/logs/$PNAME.out.1 $_DIR/logs/$PNAME.out.2; fi
    if [ -e $_DIR/logs/$PNAME.err.1 ]; then mv $_DIR/logs/$PNAME.err.1 $_DIR/logs/$PNAME.err.2; fi
    if [ -e $_DIR/logs/$PNAME.out ]; then mv $_DIR/logs/$PNAME.out $_DIR/logs/$PNAME.out.1; fi
    if [ -e $_DIR/logs/$PNAME.err ]; then mv $_DIR/logs/$PNAME.err $_DIR/logs/$PNAME.err.1; fi
    CP=$(ls $_DIR/lib/*.jar | xargs -I X printf ":%s" X)

    # If 'system.properties' exists, convert it into JVM arguments.
    # Note that the following also handles property values with spaces.
    IFS=$'\n'
    systemProperties=($(
        if [[ -f $_DIR/config/system.properties ]] ; then
            sed -n -e 's/^[ \t]*\([^ \t#]*\)[ \t]*=[ \t]*\(.*\)$/-D\1=\2/p' \
                $_DIR/config/system.properties
        fi
    ))

    cd $_DIR
    (
	if [[ "${cfg}" != "" ]] ; then
	    # need to make sure that we don't pass the lock file descriptor
	    # to subprocesses
	    exec {cfg}>&-
	fi
	nohup $JAVA_HOME/bin/java -Dkie.maven.settings.custom=$_DIR/config/kie_settings.xml -Dlog4j.configuration=file:$_DIR/config/log4j.properties -cp $_DIR/config:$_DIR/lib:$CP "${systemProperties[@]}" "$@" $CLASS > >( while read line; do echo "$(date): ${line}"; done > $_DIR/logs/$PNAME.out) 2> >( while read line; do echo "$(date): ${line}"; done > $_DIR/logs/$PNAME.err) &

	_PID=$!
	echo $_PID > $_PIDFILE
    )
    sleep 5
    status
    echo $_STATUS
    if [ "$_RUNNING" = "1" ]; then
       RETVAL=0
    else
       echo "Failed to start"
       remove_pid_file
       RETVAL=1
    fi
}

function stop() {
	um_stop
	update_monitor off
}

# unmonitored stop, does not change monitor status (immutable)
function um_stop() {
    status
    if [ "$_RUNNING" = "0" ]; then
       echo $_STATUS
       remove_pid_file
    else
	if [[ -n ${ENGINE_MANAGEMENT_PASSWORD} ]]; then
	    http_proxy= curl --silent --user ${ENGINE_MANAGEMENT_USER}:${ENGINE_MANAGEMENT_PASSWORD} -X DELETE http://localhost:${ENGINE_MANAGEMENT_PORT}/policy/pdp/engine -o /dev/null
	else
	    http_proxy= curl --silent -X DELETE http://localhost:${ENGINE_MANAGEMENT_PORT}/policy/pdp/engine -o /dev/null
	fi
	sleep 5
	echo "Stopping $SNAME..."
	_PID_TO_KILL=$_PID;
	echo "$SNAME (pid=${_PID_TO_KILL}) is stopping..."
	kill -TERM $_PID_TO_KILL 2> /dev/null
	sleep 5
	check_status_of_pid $_PID_TO_KILL
	if [ "$_RUNNING" = "1" ]; then
	   kill -TERM $_PID_TO_KILL
	fi
	while [ "$_RUNNING" = "1" ]; do
	   sleep 2
	   check_status_of_pid $_PID_TO_KILL
	done
	remove_pid_file
	echo "$SNAME has stopped."
    fi
    RETVAL=0
}

function status() {
    if [ -f "${_PIDFILE}" ]; then
        _PID=`cat "${_PIDFILE}"`
        check_status_of_pid $_PID
    else
        _STATUS="$SNAME (no pidfile) is NOT running"
        _RUNNING=0
    fi
    if [[ $_RUNNING = 1 ]]; then
        RETVAL=0
    else
        RETVAL=1
    fi
}


function check_status_of_pid ()
{
    if [ -n "$1" ] && kill -0 $1 2>/dev/null ; then
        _STATUS="$SNAME (pid $1) is running"
        _RUNNING=1
    else
        _STATUS="$SNAME (pid $1) is NOT running"
        _RUNNING=0
    fi
}

function remove_pid_file ()
{
   if [ -f "${_PIDFILE}" ]; then
      rm "${_PIDFILE}"
   fi
}

function update_monitor() {
	STATUS=$1
	if [[ -f ${POLICY_HOME}/etc/monitor/monitor.cfg ]]; then
		/bin/sed -i.bak \
			-e "s/^${CONTROLLER}=.*/${CONTROLLER}=${STATUS}/g" \
			${POLICY_HOME}/etc/monitor/monitor.cfg	
	fi
}


# main

_DIR=${POLICY_HOME}
CONTROLLER=policy-management-controller

RETVAL=0

_PIDFILE=${POLICY_HOME}/PID

case "$1" in
    status)
	status
	echo "$_STATUS"
	;;
    start)
	if flock ${cfg} ; then
	    start
	fi {cfg}>>${POLICY_HOME}/etc/monitor/monitor.cfg.lock
	;;
    umstart)
	um_start
	;;
    stop)
	if flock ${cfg} ; then
	    stop
	fi {cfg}>>${POLICY_HOME}/etc/monitor/monitor.cfg.lock
	;;
    umstop)
	um_stop
	;;
    restart)
	if flock ${cfg} ; then
	    stop
	    sleep 2
	    start
	fi {cfg}>>${POLICY_HOME}/etc/monitor/monitor.cfg.lock
	;;
    *)
	echo "error: invalid option $@"
	echo "Usage: $0 status|start|stop|restart"
	RETVAL=1
	;;
esac

exit ${RETVAL}