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

let
  cfg = config.services.spacebarchat-server;
  configFile = (import ./config-file.nix { inherit config lib pkgs; });
  makeServerTsService = import ../../lib/makeServerTsService.nix { inherit cfg lib; };
in
{
  options.services.spacebarchat-server.pion-sfu = {
    enable = lib.mkEnableOption "Enable Spacebar Pion SFU";
    openFirewall = lib.mkEnableOption "Allow SFU port in firewall";
    package = lib.mkPackageOption self.packages.${pkgs.stdenv.hostPlatform.system} "Pion SFU" { default = "pion-sfu"; };

    publicIp = lib.mkOption {
      type = lib.types.str;
      description = "Public IP address of the server.";
    };
    listenPort = lib.mkOption {
      type = lib.types.port;
      default = 6000;
      description = "UDP port the SFU will listen on.";
    };
  };

  config = lib.mkIf cfg.pion-sfu.enable {
    networking.firewall.allowedUDPPorts = lib.mkIf cfg.pion-sfu.openFirewall [ cfg.pion-sfu.listenPort ];
    services.spacebarchat-server.settings.regions = {
      default = "default";
      available = [
        {
          id = "default";
          name = "Default Region";
          endpoint = cfg.webrtcEndpoint.host + ":" + toString cfg.webrtcEndpoint.publicPort;
          vip = false;
          custom = false;
          deprecated = false;
        }
      ];
    };

    systemd.services.spacebar-webrtc = makeServerTsService {
      description = "Spacebar Server - WebRTC";
      requires = [ "spacebar-sfu.service" ];
      environment = builtins.mapAttrs (_: val: builtins.toString val) (
        {
          # things we set by default...
          EVENT_TRANSMISSION = "unix";
          EVENT_SOCKET_PATH = "/run/spacebar/";
        }
        // cfg.extraEnvironment
        // {
          # things we force...
          CONFIG_PATH = configFile;
          CONFIG_READONLY = 1;
          PORT = toString cfg.webrtcEndpoint.localPort;
          APPLY_DB_MIGRATIONS = "false";
          WRTC_LIBRARY = "@spacebarchat/pion-webrtc";
          WRTC_PUBLIC_IP = cfg.pion-sfu.publicIp;
          WRTC_PORT_MIN = toString cfg.pion-sfu.listenPort;
          WRTC_PORT_MAX = toString cfg.pion-sfu.listenPort;
        }
      );
      serviceConfig = {
        ExecStart = "${cfg.package}/bin/start-webrtc";
        Type = "notify";
        Slice = "system-spacebar.slice";
      };
    };

    systemd.services.spacebar-sfu = makeServerTsService {
      description = "Spacebar Server - Pion SFU";
      serviceConfig = {
        ExecStart = "${lib.getExe cfg.pion-sfu.package} -ip ${cfg.pion-sfu.publicIp} -port ${toString cfg.pion-sfu.listenPort}";
        Slice = "system-spacebar.slice";
      };
    };
  };
}