{ ... }:
{
  services.hypridle = {
    enable = true;
    settings = {
      general = {
        lock_cmd = "pidof swaylock || ~/.config/swaylock/swaylock.sh"; # avoid starting multiple lock instances.
        before_sleep_cmd = "loginctl lock-session"; # lock before suspend.
        after_sleep_cmd = "hyprctl dispatch dpms on"; # to avoid having to press a key twice to turn on the display.
      };

      listener = [
        {
          timeout = 300; # 5min
          on-timeout = "brightnessctl -s set 10"; # set monitor backlight to minimum, avoid 0 on OLED monitor.
          on-resume = "brightnessctl -r"; # monitor backlight restore.
        }
        {
          timeout = 330; # 5.5 min
          on-timeout = "loginctl lock-session"; # lock screen when timeout has passed
        }
        {
          timeout = 600; # 10 min
          on-timeout = "hyprctl dispatch dpms off"; # screen off when timeout has passed
          on-resume = "hyprctl dispatch dpms on && brightnessctl -r"; # screen on when activity is detected after timeout has fired.
        }
        {
          timeout = 1800; # 30min
          on-timeout = "systemctl suspend"; # suspend pc
        }
      ];
    };
  };
}