{ pkgs, ... }:

{
  environment.systemPackages = [ pkgs.libnotify ];

  services.udev.extraRules = ''
    SUBSYSTEM=="power_supply", ATTR{online}=="0", ACTION=="change", TAG+="systemd", ENV{SYSTEMD_USER_WANTS}+="mute-audio.service"
  '';

  systemd.user.services.mute-audio = {
    description = "mute audio when switching to battery power";
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${pkgs.bash}/bin/bash -c '${pkgs.pulseaudio}/bin/pactl set-sink-mute $(${pkgs.pulseaudio}/bin/pactl get-default-sink) true && ${pkgs.libnotify}/bin/notify-send \"audio Muted\" \"switched to battery power\"'";
    };
  };
}