{ lib, config, modulesPath, ... }:
let
  cfg = config.bagel.hardware.oracle-vm;
  inherit (lib) mkEnableOption mkIf mkOption types;
in
{
  options.bagel.hardware.oracle-vm = {
    enable = mkEnableOption "Oracle's VM hardware defaults";

    system = mkOption {
      # Only the free Oracle VMs are supported.
      type = types.enum [ "aarch64-linux" ];
    };
  };

  # Imports a bunch of virtio modules.
  imports = [
    "${modulesPath}/profiles/qemu-guest.nix"
  ];

  config = mkIf cfg.enable {
    boot.loader.systemd-boot.enable = true;
    boot.loader.efi.canTouchEfiVariables = true;
    boot.initrd.systemd.enable = true;

    boot.initrd.availableKernelModules = [
      "xhci_pci" "virtio_pci" "usbhid" "sr_mod"
    ];
    boot.initrd.kernelModules = [ ];
    boot.kernelModules = [ ];
    boot.extraModulePackages = [ ];

    nixpkgs.hostPlatform = cfg.system;

    # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
    # (the default) this is the recommended approach. When using systemd-networkd it's
    # still possible to use this option, but it's recommended to use it in conjunction
    # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
    networking.useDHCP = lib.mkDefault false;
    # Examples:
    # 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    #  link/ether 02:00:17:00:91:6e brd ff:ff:ff:ff:ff:ff
    #  inet 10.0.0.94/24 brd 10.0.0.255 scope global dynamic noprefixroute enp0s3
    #     valid_lft 44162sec preferred_lft 33362sec
    #  inet6 fe80::17ff:fe00:916e/64 scope link
    #     valid_lft forever preferred_lft forever
    # [root@build02-aarch64-lahfa:~]# ip r
    # default via 10.0.0.1 dev enp0s3 proto dhcp src 10.0.0.94 metric 1002 mtu 9000
    networking.interfaces.enp0s3.useDHCP = lib.mkDefault true;
  };
}