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{
  config,
  lib,
  pkgs,
  ...
}:
let
  cfg = config.services.tsnet-serve;
  pkg = pkgs.callPackage ../pkg { inherit pkgs; };

  instanceOptions =
    {
      name,
      config,
      ...
    }:
    {
      options = {
        enable = lib.mkEnableOption "tsnet-serve-${name}";

        user = lib.mkOption {
          type = lib.types.str;
          default = "tsnet-serve";
          description = "User to run tsnet-serve";
        };

        backend = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
          description = "Target URL to proxy";
          example = "https://localhost:3000";
        };

        hostname = lib.mkOption {
          type = lib.types.str;
          default = name;
          description = "App name";
          example = "myapp";
        };

        funnel = lib.mkOption {
          type = lib.types.bool;
          default = false;
          description = "Enable funnel mode";
        };

        port = lib.mkOption {
          type = lib.types.port;
          default = 443;
          description = "Port to listen on";
        };

        mountPath = lib.mkOption {
          type = lib.types.str;
          default = "/";
          description = "Path to mount proxy on";
        };

        stateDir = lib.mkOption {
          type = lib.types.str;
          default = "/var/lib/tsnet-serve-${name}";
          description = "Directory to store state in";
        };

        authKey = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
          description = "Tailscale auth key";
        };

        package = lib.mkOption {
          type = lib.types.package;
          default = pkg;
          description = "The tsnet-serve package to use";
        };
      };
    };
in
{
  options = {
    services.tsnet-serve.instances = lib.mkOption {
      type = lib.types.attrsOf (lib.types.submodule instanceOptions);
      default = { };
      description = "Attribute set of tsnet-serve instances";
    };
  };

  config = lib.mkIf (cfg.instances != { }) {
    systemd.services = lib.mapAttrs' (
      name: instanceCfg:
      lib.nameValuePair "tsnet-serve-${name}" {
        description = "tsnet-serve-${name}";
        wantedBy = [ "multi-user.target" ];
        after = [ "network.target" ];
        serviceConfig = {
          ExecStart =
            let
              args =
                lib.optionals (instanceCfg.backend != null) [
                  "--backend=${instanceCfg.backend}"
                ]
                ++ [
                  (lib.optionalString instanceCfg.funnel "--funnel")
                  "--hostname=${instanceCfg.hostname}"
                  "--listen-port=${builtins.toString instanceCfg.port}"
                  "--mount-path=${instanceCfg.mountPath}"
                  "--state-dir=${instanceCfg.stateDir}"
                ];
            in
            "${instanceCfg.package}/bin/tsnet-serve ${lib.concatStringsSep " " args}";
          User = instanceCfg.user;
          Restart = "on-failure";
          Environment = [ "TS_AUTHKEY=${instanceCfg.authKey}" ];
        };
      }
    ) (lib.filterAttrs (name: instanceCfg: instanceCfg.enable) cfg.instances);

    users.users = lib.mapAttrs' (
      name: instanceCfg:
      lib.nameValuePair instanceCfg.user {
        isSystemUser = true;
        group = instanceCfg.user;
        home = instanceCfg.stateDir;
        createHome = true;
      }
    ) (lib.filterAttrs (name: instanceCfg: instanceCfg.enable) cfg.instances);

    users.groups = lib.mapAttrs' (name: instanceCfg: lib.nameValuePair instanceCfg.user { }) (
      lib.filterAttrs (name: instanceCfg: instanceCfg.enable) cfg.instances
    );
  };
}