{ config, lib, ... }:
let
  cfg = config.myConfig.tailscale;
in
{
  options.myConfig.tailscale = {
    enable = lib.mkEnableOption "";
    ssh.enable = lib.mkEnableOption "";
    exitNode.enable = lib.mkEnableOption "";
  };

  config = lib.mkIf cfg.enable {
    sops.secrets.tailscale-auth-key = { };

    services.tailscale = {
      enable = true;

      authKeyFile = config.sops.secrets.tailscale-auth-key.path;
      openFirewall = true;
      permitCertUid = "root";

      useRoutingFeatures = if cfg.exitNode.enable then "server" else "client";
      extraUpFlags = [
        (lib.mkIf cfg.ssh.enable "--ssh")
        (lib.mkIf cfg.exitNode.enable "--advertise-exit-node")
      ];
    };
  };
}