#!/bin/zsh
DEPENDENCIES+=()
REQUIRED_ENV+=()

use desktop/notify --group dotwryn

CHECK_ENVIRONMENT
#####################################################################

{
command -v xbacklight     && UTIL=xbacklight
command -v gmux_backlight && UTIL=gmux_backlight
command -v enlighten      && UTIL=enlighten
} >/dev/null 2>&1

[[ $UTIL =~ ^enlighten$ ]] && {
	CURRENT_PERCENT=$(enlighten | sed 's/.*(//;s/%.*//')
	[[ $CURRENT_PERCENT -gt 60 ]] && DELTA=20
	[[ $CURRENT_PERCENT -le 60 ]] && DELTA=10
	[[ $CURRENT_PERCENT -le 40 ]] && DELTA=5
	[[ $CURRENT_PERCENT -le 10 ]] && DELTA=1
}

case $1 in
	up )
		case $UTIL in
			xbacklight     ) xbacklight + 10 ;;
			gmux_backlight ) gmux_backlight +100 ;;

			enlighten )
				[[ $CURRENT_PERCENT -ge 99 ]] && NOTIFY_SEND 'at maximum brightness' && exit 0
				enlighten +${DELTA}%
				;;
		esac
		;;
	down )
		case $UTIL in
			xbacklight     ) xbacklight - 10     ;;
			gmux_backlight ) gmux_backlight -100 ;;

			enlighten ) 
				[[ $CURRENT_PERCENT -le 1 ]] && NOTIFY_SEND 'at minimum brightness' && exit 0
				[[ $CURRENT_PERCENT -le 2 ]] && ARGS='=1%' || ARGS="-${DELTA}%"
				enlighten "$ARGS"
				;;
		esac
		;;
	set )
		[ ! $2 ] && FAIL 1 'no value provided to set'
		case $UTIL in 
			xbacklight     ) xbacklight -set $2 ;;
			gmux_backlight ) gmux_backlight $2  ;;
			enlighten      ) enlighten "=$2"    ;;
		esac
		;;
	min | minimum )
		case $UTIL in
			enlighten ) enlighten '=1%' ;;
		esac
		;;
	max | maximum )
		case $UTIL in
			enlighten ) enlighten '=100%' ;;
		esac
		;;
	query | '' )
		case $UTIL in
			enlighten ) NOTIFY_SUCCESS "current brightness : $(enlighten)" ;;
		esac
		;;

	* ) NOTIFY_FAIL 1 "operation '$1' not supported" ;;
esac