#!/bin/bash
bright=`cat /sys/class/backlight/amdgpu_bl0/brightness`
state=-1
thresh=(0 1 3 5 9 15 27 48 84 147 255)

for i in ${!thresh[@]}; do
    if [[ $bright -ge ${thresh[$i]} ]]
    then
        state=$i
    fi    
done

new=$(($1 + $state))

if [[ $new -ge 0 ]] && [[ $new -le 10 ]]
then
    echo ${thresh[$new]} | tee /sys/class/backlight/amdgpu_bl0/brightness
    if [[ $? -eq 0 ]] && [[ -f $(which dunstify) ]]
    then
        dunstify -a "changebrightness.sh" -u low -i weather-clear -h string:x-dunst-stack-tag:changebrightness  -h string:hlcolor:#ffffff -h int:value:$(($new*10)) "Brightness: $new"
    fi
fi