{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.services.syncthing.autoRegister;
  localpkgs = import ../. { inherit pkgs; };
  register-script = pkgs.writeShellScript "syncthing-autoregister-script" ''
    ${localpkgs.syncthing-set-id}/bin/syncthing-set-id /tmp/syncthing-auto-register-test-device-ids.nix
  '';
in {
  options = {
    services.syncthing.autoRegister = {
      enable = mkEnableOption ''
        Automatically write the local syncthing device id to /tmp/syncthing-auto-register-test-device-ids.nix
      '';
    };
  };
  config = mkIf cfg.enable {
    systemd.services.syncthing-autoregister = {
      after = [ "syncthing.service" "syncthing-init.service" ];
      wantedBy = [ "multi-user.target" ];
      environment.NIX_PATH = config.environment.variables.NIX_PATH;
      serviceConfig = {
        User = config.services.syncthing.user;
        RemainAfterExit = true;
        Type = "oneshot";
        ExecStart = register-script;
      };
    };
  };
}