{
  config,
  lib,
  ...
}: let
  dataDir = "/var/lib/paperless";
in {
  options.services.paperless = {
    impermanence.enable = lib.mkOption {
      type = lib.types.bool;
      default = config.services.paperless.enable && config.host.impermanence.enable;
    };
  };

  config = lib.mkIf config.services.paperless.impermanence.enable {
    assertions = [
      {
        assertion = config.services.paperless.dataDir == dataDir;
        message = "paperless data location does not match persistence";
      }
    ];
    environment.persistence."/persist/system/root" = {
      directories = [
        {
          directory = dataDir;
          user = "paperless";
          group = "paperless";
        }
      ];
    };
  };
}