#!/bin/bash

case $1 in
  up)
    brightnessctl set 10%+
    ;;
  down)
    brightnessctl set --min-value=1 10%-
    ;;
  off)
    brightnessctl set 0
    ;;
  max)
    brightnessctl set 100%
    ;;
esac
ID_LOCATION=/run/user/$(id -u)/i3-helpers/brightness-notification-id
OLD_ID=$(<"$ID_LOCATION")
BRIGHTNESS=$(( $(brightnessctl get) * 100 / $(brightnessctl max) )) 
NEW_ID=$(dunstify --appname=brightness.sh --timeout=3000 --hints="int:value:$BRIGHTNESS" --printid "${OLD_ID:+--replace="${OLD_ID}"}" "Brightness" "${BRIGHTNESS}%" )
mkdir -p $(dirname "$ID_LOCATION")
echo "$NEW_ID" >"$ID_LOCATION"