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

let
  cfg = config.services.gebos.hivemq;
in
{
  options.services.gebos.hivemq = {
    enable = lib.mkEnableOption "HiveMQ CE single-node broker";
    persistentSessions = lib.mkOption {
      type = lib.types.bool;
      default = true;
    };
    tlsPort = lib.mkOption {
      type = lib.types.port;
      default = 8883;
    };
  };

  config = lib.mkIf cfg.enable {
    # TODO: package HiveMQ CE (download tarball + JRE wrapper) and wire as a
    # systemd unit. Until then this module only declares options so dependent
    # hosts can be evaluated.
    systemd.services.gebos-hivemq = {
      description = "HiveMQ CE";
      wantedBy = [ "multi-user.target" ];
      serviceConfig = {
        Type = "simple";
        ExecStart = "${pkgs.coreutils}/bin/true";  # TODO: real HiveMQ command
        Restart = "on-failure";
      };
    };
  };
}