#!/bin/bash
set -euo pipefail

# original script from https://wiki.archlinux.org/index.php/Dunst
# <alexforsale@yahoo.com>
# changeBrightness

# Arbitrary but unique message tag
msgTag="mybrightness"

# Change the volume using alsa(might differ if you use pulseaudio)
#amixer -c 0 set Master "$@" > /dev/null
#pamixer --set-volume "${@}" > /dev/null
brightnessctl set "${@}" > /dev/null

# Query amixer for the current volume and whether or not the speaker is muted
#volume="$(amixer -c 0 get Master | tail -1 | awk '{print $4}' | sed 's/[^0-9]*//g')"
#mute="$(amixer -c 0 get Master | tail -1 | awk '{print $6}' | sed 's/[^a-z]*//g')"
#volume="$(pamixer --get-volume-human)"
#mute="$(pamixer --get-mute)"
max="$(brightnessctl max)"
current="$(brightnessctl get)"
percentage="$(awk -v current=${current} -v max=${max} 'BEGIN { print ( (current / max) * 100 )}')"
percentage="${percentage%.*}"

# Show the brightness notification
dunstify -a "changeBrightness" -u low -i audio-volume-high -h string:x-dunst-stack-tag:$msgTag \
    -h int:value:"${percentage}" " Brightness: ${percentage}%"

# Play the brightness changed sound
canberra-gtk-play -i audio-volume-change -d "changeVolume"