#!/bin/sh

. slib

help() {
cat << EOF
${0}: Wrapper script to change backlight
options:
 -i [Brg]        Increase backlight by Brg
 -d [Brg]        Decrease backlight by Brg
 -s [Brg]        Set backlight to Brg
 -p              Show the current backlight
 -h              Print this message and exit

NOTE: Script interprets values as percentages
EOF

help

exit 0
}

check_program "brightnessctl"

[ ${#} != 1 ] && [ ${#} != 2 ] && invalid_use

while getopts "i:d:s:ph" option; do
	case "${option}" in
	i) run --reload-status "brightnessctl set +${OPTARG}%" ;;

	d) run --reload-status "brightnessctl set ${OPTARG}-%" ;;

	s) run --reload-status "brightnessctl set ${OPTARG}%" ;;

	p)
		if ! echo $(( ($(brightnessctl g) * 100)  / $(brightnessctl m) )); then
			err "Failed to get current brightness"
		else
			exit 0
		fi
	;;
	h) help ;;

	*) invalid_use -h ;;

	esac
done

# Unreachable
invalid_use