#!/bin/bash

set -euo pipefail

wobsock="$XDG_RUNTIME_DIR/wob.sock"
if [ ! -p "$wobsock" ]; then
  echo $wobsock
  echo "communication socket not found"
  exit 2
fi

current=$(brightnessctl -m info | cut -d, -f4 | tr --delete '%')
case $1 in
    up)
        increment=$(( 5 - ( current % 5 ) ))
        new=$(( current + increment ))
        if [ $new -gt 100 ]; then
            new=100
        fi
        brightnessctl set $new% > /dev/null 2>&1
        echo $new > $wobsock;;
    down)
        increment=$(( ( ( current - 1 ) % 5 ) + 1 ))
        new=$(( current - increment ))
        if [ $new -lt 0 ]; then
            new=0
        fi
        brightnessctl set $new% > /dev/null 2>&1
        echo $new > $wobsock;;
esac