{ config, lib, pkgs, ... }: let
  systemsDir = ../../../../../systems;
  systemNames = lib.attrNames (lib.filterAttrs 
    (name: type: type == "directory" && builtins.pathExists (systemsDir + "/${name}/cfg.nix")) 
    (builtins.readDir systemsDir));

  # Use a helper to check if the attribute path exists safely
  # This prevents the "attribute 'net' missing" error
  isValidPeer = p: 
    (p ? syscfg.net.wg.enable) && 
    (p.syscfg.net.wg.enable == true) && 
    (p.syscfg.net.wg.pubkey != config.syscfg.net.wg.pubkey);

  importedConfigs = map (name: import (systemsDir + "/${name}/cfg.nix")) systemNames;

  activePeers = builtins.filter isValidPeer importedConfigs;
in
{
  imports = [ ./forwarding.nix ];
  config = lib.mkIf (config.syscfg.net.wg.enable) {
    networking.wireguard = {
      enable = true;
      interfaces = {
        wg0 = {
          ips = [ config.syscfg.net.wg.ip4 config.syscfg.net.wg.ip6 ];
          privateKeyFile =
            config.sops.secrets."${config.syscfg.hostname}_wg_priv".path;
          listenPort = 1515;
          mtu = 1340;
          peers = 
            if config.syscfg.net.wg.server.enable then
              map (p: {
                name = p.syscfg.hostname;
                publicKey = p.syscfg.net.wg.pubkey;
                allowedIPs = [ p.syscfg.net.wg.ip4 p.syscfg.net.wg.ip6 ];
              }) activePeers
            else
              [{
                allowedIPs = [ "10.10.1.0/24" "fd10:10:10::0/64" ];
                endpoint = "vpn.helcel.net:1515";
                publicKey = "NFBJvYXZC+bd62jhrKnM7/pugidWhgR6+C5qIiUiq3Q=";
                persistentKeepalive = 30;
              }];
        };
      };
    };
  };
}