{ 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

{

  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.
  };
  #boot.loader.grub.mirroredBoots = [
  #  { path = "/boot_sda"; devices = [ "/dev/sda" ]; }
  #  { path = "/boot_sdb"; devices = [ "/dev/sdb" ]; }
  #];


  # Network configuration (Hetzner uses static IP assignments, and we don't use DHCP here)
  #networking.useDHCP = false;
  #networking.interfaces.${networkInterface} = {
  #  ipv4 = { addresses = [{ address = ipv4.address; prefixLength = ipv4.prefixLength; }]; };
  #  ipv6 = { addresses = [{ address = ipv6.address; prefixLength = ipv6.prefixLength; }]; };
  #};
  #networking.defaultGateway = ipv4.gateway;
  #networking.defaultGateway6 = { address = ipv6.gateway; interface = networkInterface; };
  #networking.nameservers = [ "8.8.8.8" "1.1.1.1" ];

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

  environment.systemPackages = [ pkgs.mosh ];

  users.users.root.openssh.authorizedKeys.keys = [
    "ssh-rsa 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"
  ];

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

  system.stateVersion = "23.11";

  # enable ssh on init
  # ------------------

  #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"
  #];

  # luks unlock zeug
  #boot.initrd.systemd.services.openssh = {
  #  enable = true;
  #};
  #unlock_root(){
  #  pw=$(rbw get 'zfs encryption')
  #  ssh root@eve.i -p 2222 "echo ${pw} | systemd-tty-ask-password-agent"
  #}
  #boot.initrd.systemd.users.root.shell = "/bin/cryptsetup-askpass";

  #boot.kernelParams = [ "ip=dhcp" ];
  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
      ];
    };
  };

  systemd.network.networks."10-uplink".networkConfig.Address = ipv6.address;
  boot.initrd.systemd.network.networks."10-uplink" = config.systemd.network.networks."10-uplink";
  boot.initrd.systemd.enable = true;

  # root shell if not booting (usefull for debugging), but hijacks luks unlock
  #boot.initrd.systemd.emergencyAccess  = true;
}