#!/bin/ash

if [ "$(whoami)" != "root" ]; then
	echo "Only root can call this"
	exit 1
fi

if [ $# -ne 1 ]; then
	echo "$0 <reboot|poweroff>"
	exit 1
fi

MODE=$1

if [ "$MODE" != "reboot" ] && [ "$MODE" != "poweroff" ]; then
	slxlog "idleaction-failed-call" "Invalid call to idleaction-scheduled_action. Mode '$MODE' unknown."
	exit 1
fi

NUM=$(who | wc -l)
[ "$NUM" = "0" ] && $MODE # Easy way out - machine is idle

# Someone logged in
for MINUTES in 5 X X X X X X X 3 X X X 2 X X X 1 X X X; do
	NUM=$(who | wc -l)
	[ "$NUM" = "0" ] && break
	if [ "$MINUTES" != "X" ]; then
		USERS=0
		if [ "$MODE" = "reboot" ]; then
			MESSAGE="Das System wird in $MINUTES Minute(n) neugestartet, bitte beenden Sie Ihre Sitzung.
The system will reboot in $MINUTES minute(s). Please save your work and end the session."
		else
			MESSAGE="Dieser Rechner wird in $MINUTES Minute(n) abgeschaltet, bitte beenden Sie Ihre Sitzung.
The system will power off in $MINUTES minute(s). Please save your work and end the session."
		fi
		for d in $(who | awk '{print $2}' | sort -u); do
			if [ "${d:0:1}" = ":" ]; then
				# X11
				export DISPLAY=$d
				export XAUTHORITY=$(ps a | grep " $DISPLAY " | grep -o -- '-auth.*$' | grep -m1 -v grep | awk '{print $2}')
				# TODO: Don't look... We need to pick a proper util for this
				/opt/openslx/cups/printergui --error "$MESSAGE" &
				unset DISPLAY XAUTHORITY
				USERS=$(( $USERS + 1 ))
			elif [ "${d:0:3}" = "tty" ]; then
				# Regular tty
				cat > "/dev/$d" <<-EOF
				*
				***************************
				$MESSAGE
				***************************
				*
				EOF
				USERS=$(( $USERS + 1 ))
			elif [ "${d:0:3}" = "pts" ]; then
				# pts - xterm or ssh session
				cat > "/dev/pts/${d:3}" <<-EOF
				*
				***************************
				$MESSAGE
				***************************
				*
				EOF
				USERS=$(( $USERS + 1 ))
			fi
		done
		FILE=$(mktemp)
		who > "$FILE"
		slxlog "idleaction-busy" "Postponed $MODE ($MINUTES minutes max.) - $USERS user(s) still active"
		sleep 1
		rm -- "$FILE"
	fi
	sleep 15
done

$MODE