{ config, lib, pkgs, ... }:

with lib;

let
  cfg = config.services.uucp.notify-client;

  nodeConfig = {
    options = {
      allowedUsers = mkOption {
        type = with types; uniq (listOf str);
        default = config.services.notify-users;
      };
    };
  };
in {
  options = {
    services.uucp.notify-client = {
      remoteNodes = mkOption {
        type = with types; attrsOf (submodule nodeConfig);
        default = {};
        description = ''
          Servers to receive notifications from
        '';
      };
    };
  };

  imports = [ ./notify-users.nix ];

  config = mkIf (cfg.remoteNodes != {}) {
    assertions = map (user: { assertion = elem user config.services.notify-users; message = "Notification must be allowed for ${user}!"; }) (unique (concatLists (mapAttrsToList (name: { allowedUsers, ... }: allowedUsers) cfg.remoteNodes)));

    services.uucp.remoteNodes = mapAttrs (name: { allowedUsers, ... }: { commands = map (user: "notify-${user}") allowedUsers; }) cfg.remoteNodes;
    services.uucp.commandPath = [ config.security.wrapperDir ];
  };
}