{
  config,
  lib,
  namespace,
  ...
}:
with lib;
let
  cfg = config.${namespace}.impermanence;
in
{
  imports = [ ./options.nix ];

  config = mkIf cfg.enable {
    environment.persistence."/nix/persist/system" = {
      hideMounts = true;
      directories = [
        "/var/lib/bluetooth"
        "/var/lib/iwd"
        "/var/lib/nixos"
        "/var/lib/libvirt"
        "/var/lib/waydroid"
        "/var/lib/systemd/coredump"
        "/etc/NetworkManager/system-connections"
        "/var/lib/tailscale"
        "/var/lib/homeassistant"
        "/var/lib/mosquitto"
        "/var/lib/music-assistant"
        "/var/lib/postgresql"
        "/var/lib/zigbee2mqtt"
        {
          directory = "/var/lib/colord";
          user = "colord";
          group = "colord";
          mode = "u=rwx,g=rx,o=";
        }
        {
          directory = "/etc/nix";
          user = "root";
          group = "root";
          mode = "u=rwx,g=rx,o=rx";
        }
        {
          directory = "/var/lib/private/authentik/media";
          user = "authentik";
          group = "authentik";
          mode = "u=rwx,g=,o=";
        }
        {
          directory = "/var/lib/private";
          mode = "u=rwx,g=rx,o=";
        }
        {
          directory = "/media/nas";
          user = "nas-apps";
          group = "jallen-nas";
          mode = "u=rwx,g=rx,o=rx";
        }
        {
          directory = "/var/lib/crowdsec";
          user = "crowdsec";
          group = "crowdsec";
          mode = "u=rwx,g=rwx,o=rx";
        }
        {
          directory = "/plugins-storage";
          user = "traefik";
          group = "traefik";
          mode = "u=rwx,g=rwx,o=rx";
        }
      ];
      files = [
        "/etc/machine-id"
      ];
    };

    security.sudo.extraConfig = ''
      # rollback results in sudo lectures after each reboot
      Defaults lecture = never
    '';

    # system.activationScripts = {
    #   "var-lib-private-permissions" = {
    #     deps = [ "createPersistentStorageDirs" ];
    #     text = ''
    #       mkdir -p /var/lib/private
    #       chmod 0700 /var/lib/private
    #     '';
    #   };
    # };

    # boot.initrd.systemd.services.rootfs-cleanup = {
    #   description = "Clean file system root";
    #   wantedBy = [
    #     "initrd.target"
    #   ];
    #   after = [
    #     "initrd-root-device.target"
    #   ];
    #   before = [
    #     "sysroot.mount"
    #   ];
    #   unitConfig.DefaultDependencies = "no";
    #   serviceConfig.Type = "oneshot";
    #   script =
    #     if (hasAttr "/" config.fileSystems) && (config.fileSystems."/".fsType == "btrfs") then
    #       ''
    #         # workaround for machines without working rtc battery
    #         # The time may not yet be correctly set, so wait until it is
    #         if [[ $(date '+%s') -lt 1730469314 ]]; then
    #           sleep 30 # this should hopefully be enough
    #         fi
    #         mkdir /btrfs_tmp
    #         mount ${config.fileSystems."/".device} -t btrfs /btrfs_tmp
    #         if [[ -e /btrfs_tmp/root ]]; then
    #           mkdir -p /btrfs_tmp/old_roots
    #           timestamp=$(date --date="@$(stat -c %X /btrfs_tmp/root)" "+%Y-%m-%d_%H:%M:%S")
    #           mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
    #         fi

    #         delete_subvolume_recursively() {
    #           IFS=$'\n'
    #           for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
    #             delete_subvolume_recursively "/btrfs_tmp/$i"
    #           done
    #           btrfs subvolume delete "$1" || rm -rf "$1"
    #         }

    #         for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -atime +30); do
    #           delete_subvolume_recursively "$i"
    #         done

    #         btrfs subvolume create /btrfs_tmp/root
    #         umount /btrfs_tmp
    #       ''
    #     else if (hasAttr "/" config.fileSystems) && (config.fileSystems."/".fsType == "bcachefs") then
    #       ''
    #         # workaround for machines without working rtc battery
    #         # The time may not yet be correctly set, so wait until it is
    #         if [[ $(date '+%s') -lt 1730469314 ]]; then
    #           sleep 30 # this should hopefully be enough
    #         fi
    #         if [[ -e /root_tmp/root ]]; then
    #           mkdir -p /root_tmp/old_roots
    #           timestamp=$(date --date="@$(stat -c %X /root_tmp/root)" "+%Y-%m-%d_%H:%M:%S")
    #           mv /root_tmp/root "/root_tmp/old_roots/$timestamp"
    #         fi

    #         for i in $(find /root_tmp/old_roots/ -maxdepth 1 -atime +30); do
    #           bcachefs subvolume delete $i
    #         done

    #         bcachefs subvolume create /root_tmp/root
    #       ''
    #     else
    #       # For tmpfs or other filesystems, do nothing
    #       "";
    # };

    # assertions = [
    #   {
    #     assertion = hasAttr "/" config.fileSystems;
    #     message = "To use impermanence, you need to define a root volume";
    #   }

    #   {
    #     assertion =
    #       if hasAttr "/" config.fileSystems then
    #         config.fileSystems."/".fsType == "btrfs"
    #         || config.fileSystems."/".fsType == "bcachefs"
    #         || config.fileSystems."/".fsType == "tmpfs"
    #       else
    #         false;
    #     message = "rootfs must be btrfs, bcachefs, or tmpfs; not " + config.fileSystems."/".fsType;
    #   }

    #   {
    #     assertion =
    #       if
    #         hasAttr "/" config.fileSystems
    #         && (config.fileSystems."/".fsType == "btrfs" || config.fileSystems."/".fsType == "bcachefs")
    #       then
    #         any (
    #           t: t == "subvol=root" || t == "subvol=/root" || t == "X-mount.subdir=root"
    #         ) config.fileSystems."/".options
    #       else
    #         true;
    #     message = "btrfs or bcachefs rootfs must mount subvolume root";
    #   }
    #   {
    #     assertion = !config.boot.isContainer;
    #     message = "impermanence is not supported in containers";
    #   }
    # ];

    # environment.persistence.${cfg.persistencePath} = {
    #   hideMounts = true;
    #   directories = [
    #     "/var/lib/bluetooth"
    #     "/var/lib/iwd"
    #     "/var/lib/nixos"
    #     "/var/lib/libvirt"
    #     "/var/lib/waydroid"
    #     "/var/lib/systemd/coredump"
    #     "/etc/NetworkManager/system-connections"
    #     "/var/lib/tailscale"
    #     "/var/lib/homeassistant"
    #     "/var/lib/mosquitto"
    #     "/var/lib/music-assistant"
    #     "/var/lib/postgresql"
    #     "/var/lib/zigbee2mqtt"
    #     {
    #       directory = "/var/lib/colord";
    #       user = "colord";
    #       group = "colord";
    #       mode = "u=rwx,g=rx,o=";
    #     }
    #     {
    #       directory = "/etc/nix";
    #       user = "root";
    #       group = "root";
    #       mode = "u=rwx,g=rx,o=rx";
    #     }
    #     {
    #       directory = "/var/lib/private/authentik/media";
    #       user = "authentik";
    #       group = "authentik";
    #       mode = "u=rwx,g=,o=";
    #     }
    #     {
    #       directory = "/var/lib/private";
    #       mode = "u=rwx,g=rx,o=";
    #     }
    #     {
    #       directory = "/media/nas";
    #       user = "nas-apps";
    #       group = "jallen-nas";
    #       mode = "u=rwx,g=rx,o=rx";
    #     }
    #     {
    #       directory = "/var/lib/crowdsec";
    #       user = "crowdsec";
    #       group = "crowdsec";
    #       mode = "u=rwx,g=rwx,o=rx";
    #     }
    #     {
    #       directory = "/plugins-storage";
    #       user = "traefik";
    #       group = "traefik";
    #       mode = "u=rwx,g=rwx,o=rx";
    #     }
    #   ];
    #   files = [
    #     "/etc/machine-id"
    #   ];
    # };
  };
}