{ pkgs, ... }:
let
  brightnessScript = pkgs.writeShellScriptBin "brightness" ''
    BUS=10
    STEP=5
    MIN=0
    MAX=100
    OSD_FILE="/tmp/brightness_osd_level"

    current=$(ddcutil --bus=$BUS getvcp 10 | grep -oP "current value\\s*=\\s*\\K[0-9]+")
    new=$current

    if [[ "$1" == "up" ]]; then
      new=$((current + STEP))
      (( new > MAX )) && new=$MAX
    elif [[ "$1" == "down" ]]; then
      new=$((current - STEP))
      (( new < MIN )) && new=$MIN
    else
      exit 1
    fi

    ddcutil --bus=$BUS setvcp 10 "$new"
    echo "$new" > "$OSD_FILE"
  '';
in
{
  home.packages = [
    brightnessScript
  ];
}