#!/bin/sh

declare -x VOERBOOS
RETVAL=0;export RETVAL
BATVAL="$(echo "scale=0;$(cat /sys/class/power_supply/BAT0/charge_now)*100/$(cat /sys/class/power_supply/BAT0/charge_full)"|bc -l)";export BATVAL
BATSTATE="`cat /sys/class/power_supply/BAT0/status`";export BATSTATE
BATFILE="/tmp/batman.sd";export BATFILE
export OPTCNT=0
function batmobile {
	if [ "$BATVAL" -le 5 ];then
		case "$BATSTATE" in
			"Charging")
				MSG="Battery charged at $BATVAL% with status \"$BATSTATE\", no shutdown."
				[ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||true
				logger -p"info" -t"batman" "Battery charged at $BATVAL% with status \"$BATSTATE\", no shutdown."||RETVAL=$(("$RETVAL"+$?))
				[ -e "$BATFILE" ]&&/usr/sbin/shutdown -c >/dev/null 2>&1&&rm "$BATFILE"
				SDCRV="$?"
				case "$SDCRV" in
					0) logger -p"info" -t"batman" "Shutdown cancelled.";;
					*)
						logger -p"warn" -t"batman" "$BATFILE exists but couldn't cancel shutdown!"
						RETVAL=$(("$RETVAL"+"$SDCRV"))
					;;
				esac
			;;
			*)
				MSG="Battery charged at $BATVAL%, powering down."
				[ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||true
				logger -pwarn -t"batman" "$MSG"||RETVAL=$(("$RETVAL"+$?))
				if [ ! -e "$BATFILE" ];then
					/usr/sbin/shutdown -P +2 "Battery low and discharging, powering down. (batman)"&&touch "$BATFILE"||RETVAL=$(("$RETVAL"+$?))
				fi
			;;
		esac
	else
		MSG="Battery charged at $BATVAL%, no shutdown."
		[ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||logger -p"info" -t"batman" "$MSG"||RETVAL=$(("$RETVAL"+$?))
	fi
}
function batarang {
	MSG="$BATVAL% ($BATSTATE)";echo "$MSG";
}

while getopts :vnp SHOPT;do
	case "$SHOPT" in
		v)VOERBOOS=1;export VOERBOOS;((OPTCNT++));;
		p)batmobile;((OPTCNT++));;
		""|n)batarang;((OPTCNT++));;
		*)echo "Not supported option: -""${OPTARG}" >&2;RETVAL=$(($RETVAL+1)) >&2;WRONGOPT=1;((OPTCNT++));;
	esac
done
shift $(( $OPTIND - 1 ))
[ "$OPTCNT" -le 0 ]&&batarang
[ ! -z "$WRONGOPT" ]&&[ "$WRONGOPT" -eq 1 ]&&exit 1||true
exit "$RETVAL"