{
  config,
  lib,
  ...
}: let
  dataDir = "/var/lib/paperless";
in {
  options.services.paperless = {
    subdomain = lib.mkOption {
      type = lib.types.str;
      description = "subdomain of base domain that paperless will be hosted at";
      default = "paperless";
    };
    database = {
      user = lib.mkOption {
        type = lib.types.str;
        description = "what is the user and database that we are going to use for paperless";
        default = "paperless";
      };
    };
  };

  config = lib.mkIf config.services.paperless.enable (lib.mkMerge [
    {
      host = {
        reverse_proxy.subdomains.${config.services.paperless.subdomain} = {
          target = "http://${config.services.paperless.address}:${config.services.paperless.port}";

          websockets.enable = true;
          forwardHeaders.enable = true;

          extraConfig = ''
            # allow large file uploads
            client_max_body_size 50000M;
          '';
        };
        postgres = {
          enable = true;
          extraUsers = {
            ${config.services.paperless.database.user} = {
              isClient = true;
            };
          };
        };
      };
      services.paperless = {
        # TODO: configure passwordFile with sops
        configureTika = true;
        settings = {
          PAPERLESS_URL = "${config.services.paperless.subdomain}.${config.host.reverse_proxy.hostname}";

          PAPERLESS_DBENGINE = "postgresql";
          PAPERLESS_DBHOST = "/run/postgresql";
          PAPERLESS_DBNAME = config.services.paperless.database.user;
          PAPERLESS_DBUSER = config.services.paperless.database.user;
        };
      };
    }
    (lib.mkIf config.services.fail2ban.enable {
      # TODO: fail2ban config
    })
    (lib.mkIf config.host.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";
          }
        ];
      };
    })
  ]);
}