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

let

  # in rescue shell
  # ---------------
  # apt install -y lshw
  # lshw -C network | grep -Poh 'driver=[[:alnum:]]+'
  networkInterfaceModule = "e1000e";

  # ip addr
  networkInterface = "enp0s31f6";

  # From the Hetzner control panel
  ipv4 = {
    address = "95.216.66.212"; # the ip address
    gateway = "95.216.66.193"; # the gateway ip address
    netmask = "255.255.255.192"; # the netmask -- might not be the same for you!
    prefixLength = 26; # must match the netmask, see <https://www.pawprint.net/designresources/netmask-converter.php>
  };
  ipv6 = {
    address = "2a01:4f9:2b:326::2"; # the ipv6 addres
    gateway = "fe80::1"; # the ipv6 gateway
    prefixLength = 64; # shown in the control panel
  };

in

{
  system.stateVersion = "23.11";

  imports = [
    ./disko-config.nix
    ./hardware-configuration.nix
  ];

  # Use GRUB2 as the boot loader.
  # We don't use systemd-boot because Hetzner uses BIOS legacy boot.
  boot.loader.grub = {
    enable = true;
    efiSupport = false; # we created a ef02 partition because uefi is not supported on hetzner online machines.
  };

  # Initial empty root password for easy login:
  users.users.root.initialHashedPassword = "";
  services.openssh.settings.PermitRootLogin = "prohibit-password";
  services.openssh.settings.PasswordAuthentication = false;

  # todo : move this to the flake, this is always true
  users.users.root.openssh.authorizedKeys.keys = [
    "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQC6uza62+Go9sBFs3XZE2OkugBv9PJ7Yv8ebCskE5WYPcahMZIKkQw+zkGI8EGzOPJhQEv2xk+XBf2VOzj0Fto4nh8X5+Llb1nM+YxQPk1SVlwbNAlhh24L1w2vKtBtMy277MF4EP+caGceYP6gki5+DzlPUSdFSAEFFWgN1WPkiyUii15Xi3QuCMR8F18dbwVUYbT11vwNhdiAXWphrQG+yPguALBGR+21JM6fffOln3BhoDUp2poVc5Qe2EBuUbRUV3/fOU4HwWVKZ7KCFvLZBSVFutXCj5HuNWJ5T3RuuxJSmY5lYuFZx9gD+n+DAEJt30iXWcaJlmUqQB5awcB1S2d9pJ141V4vjiCMKUJHIdspFrI23rFNYD9k2ZXDA8VOnQE33BzmgF9xOVh6qr4G0oEpsNqJoKybVTUeSyl4+ifzdQANouvySgLJV/pcqaxX1srSDIUlcM2vDMWAs3ryCa0aAlmAVZIHgRhh6wa+IXW8gIYt+5biPWUuihJ4zGBEwkyVXXf2xsecMWCAGPWPDL0/fBfY9krNfC5M2sqxey2ShFIq+R/wMdaI7yVjUCF2QIUNiIdFbJL6bDrDyHnEXJJN+rAo23jUoTZZRv7Jq3DB/A5H7a73VCcblZyUmwMSlpg3wos7pdw5Ctta3zQPoxoAKGS1uZ+yTeZbPMmdbw=="
  ];

  services.openssh.enable = true;
  services.sshguard.enable = true;

  boot.tmp.useTmpfs = true; # make /tmp a tmpfs (performance!)

  boot.supportedFilesystems = [ "zfs" ];
  # head -c4 /dev/urandom | od -A none -t x4
  networking.hostId = "5bb982a6";

  systemd.network.networks."10-uplink".networkConfig.Address = ipv6.address;

  boot.initrd.kernelModules = [ networkInterfaceModule ];
  boot.initrd.network = {
    enable = true;
    ssh = {
      enable = true;
      authorizedKeys = config.users.users.root.openssh.authorizedKeys.keys;
      port = 2222;
      hostKeys = [
        # make sure you use --copy-host-keys during nixos-anywhere
        # (you can create ne ssh keys later, again)
        /etc/ssh/ssh_host_rsa_key
        /etc/ssh/ssh_host_ed25519_key
      ];
    };
  };

  # enable ssh on init
  # ==================


  # No SystemD at boot
  # ------------------
  #boot.kernelParams = [
  #  # See <https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt> for docs on this
  #  # ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:<dns0-ip>:<dns1-ip>:<ntp0-ip>
  #  # The server ip refers to the NFS server -- we don't need it.
  #  "ip=${ipv4.address}::${ipv4.gateway}:${ipv4.netmask}:${hostName}-initrd:${networkInterface}:off:8.8.8.8"
  #];
  #boot.initrd.systemd.enable = false;
  #boot.kernelParams = [ "ip=dhcp" ];
  #boot.initrd.network.ssh.shell = "/bin/cryptsetup-askpass";
  #boot.initrd.luks.reusePassphrases = true;

  # SystemD at boot
  # ---------------
  boot.initrd.systemd.enable = true;
  #boot.initrd.systemd.services.openssh.enable = true;
  boot.initrd.systemd.network.networks."10-uplink" = config.systemd.network.networks."10-uplink";

}