{
  lib,
  ...
}:
let
  inherit (lib) mkOption types;
in
{
  options = {
    host = mkOption {
      type = types.str;
      description = "name of the host to deploy to";
    };
    targetSystem = mkOption {
      type = types.str;
      description = "name of the host to deploy to";
    };
    sshOpts = mkOption {
      description = "Extra SSH options (`-o`) to use.";
      type = types.listOf types.str;
      default = [ ];
      example = "ConnectTimeout=60";
    };
    httpBackend = mkOption {
      description = "environment variables to configure the TF HTTP back-end, see <https://developer.hashicorp.com/terraform/language/backend/http#configuration-variables>";
      type = types.attrsOf (types.either types.str types.int);
    };
    key-file = mkOption {
      type = types.str;
      default = "";
    };
    proxmox-user = mkOption {
      description = "The ProxmoX user to use.";
      type = types.str;
      default = "root@pam";
    };
    proxmox-password = mkOption {
      description = "The ProxmoX password to use.";
      type = types.str;
    };
    node-name = mkOption {
      description = "the name of the ProxmoX node to use.";
      type = types.str;
    };
    bridge = mkOption {
      description = "The name of the network bridge (defaults to vmbr0).";
      type = types.str;
      default = "vmbr0";
    };
    vlanId = mkOption {
      description = "The VLAN identifier.";
      type = types.int;
      default = 0;
    };
    imageDatastoreId = mkOption {
      description = "ID of the datastore of the image.";
      type = types.str;
      default = "local";
    };
    vmDatastoreId = mkOption {
      description = "ID of the datastore of the VM.";
      type = types.str;
      default = "local";
    };
    cdDatastoreId = mkOption {
      description = "ID of the datastore of the virtual CD-rom drive to use for cloud-init.";
      type = types.str;
      default = "local";
    };
    ipv4Gateway = mkOption {
      description = "Gateway for IPv4.";
      type = types.str;
      default = "";
    };
    ipv4Address = mkOption {
      description = "IPv4 address.";
      type = types.str;
      default = "";
    };
    ipv6Gateway = mkOption {
      description = "Gateway for IPv6.";
      type = types.str;
      default = "";
    };
    ipv6Address = mkOption {
      description = "IPv6 address.";
      type = types.str;
      default = "";
    };
  };
}