nixos-config/hosts/armaros/configuration.nix

{
  config,
  pkgs,
  pkgs-unstable,
  inputs,
  configPath,
  hostname,
  hostTypes,
  lib,
  ...
}: {
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
    inputs.home-manager.nixosModules.default
  ];

  # Bootloader.
  boot.loader.grub.enable = lib.mkDefault true;
  boot.loader.grub.devices = ["nodev"];

  nix.settings.experimental-features = ["nix-command" "flakes"];

  # Nix optimizations
  nix.optimise.automatic = true;
  nix.settings.auto-optimise-store = true;
  nix.gc = {
    automatic = true;
    dates = "weekly";
    persistent = true;
    options = "--delete-older-than 30d";
  };

  networking.hostName = "armaros";

  # Enable networking
  networking.networkmanager.enable = true;

  # Virtualisation (since this is a VM)
  virtualisation.docker.enable = true;
  services.qemuGuest.enable = true;
  services.spice-vdagentd.enable = true;

  # zram for memory efficiency
  zramSwap = {
    enable = true;
    priority = 100;
    memoryPercent = 20; # Lower for lightweight VM
    swapDevices = 1;
    algorithm = "zstd";
  };

  # Btrfs auto-scrub
  services.btrfs.autoScrub = {
    enable = true;
    interval = "weekly";
    fileSystems = ["/" "/home" "/nix"];
  };

  # Snapper — automatic btrfs snapshots so you can roll back
  services.snapper = {
    # Snapshot / every hour, keep 10 hourly and 7 daily
    configs.root = {
      SUBVOLUME = "/";
      TIMELINE_CREATE = true;
      TIMELINE_CLEANUP = true;
      TIMELINE_MIN_AGE = "1800";
      TIMELINE_LIMIT_HOURLY = "10";
      TIMELINE_LIMIT_DAILY = "7";
      TIMELINE_LIMIT_MONTHLY = "3";
      TIMELINE_LIMIT_YEARLY = "0";
    };
    # Snapshot /home every 4 hours
    configs.home = {
      SUBVOLUME = "/home";
      TIMELINE_CREATE = true;
      TIMELINE_CLEANUP = true;
      TIMELINE_MIN_AGE = "14400";
      TIMELINE_LIMIT_HOURLY = "6";
      TIMELINE_LIMIT_DAILY = "14";
      TIMELINE_LIMIT_MONTHLY = "3";
      TIMELINE_LIMIT_YEARLY = "0";
    };
  };

  # Set your time zone.
  time.timeZone = "America/Los_Angeles";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "en_US.UTF-8";
    LC_IDENTIFICATION = "en_US.UTF-8";
    LC_MEASUREMENT = "en_US.UTF-8";
    LC_MONETARY = "en_US.UTF-8";
    LC_NAME = "en_US.UTF-8";
    LC_NUMERIC = "en_US.UTF-8";
    LC_PAPER = "en_US.UTF-8";
    LC_TELEPHONE = "en_US.UTF-8";
    LC_TIME = "en_US.UTF-8";
  };

  # Enable X11 for lightweight GUI
  services.xserver.enable = true;
  services.xserver.displayManager.lightdm.enable = true;
  services.xserver.desktopManager.xfce.enable = true;

  # Configure keymap in X11
  services.xserver.xkb = {
    layout = "us";
    variant = "";
  };

  services.sunshine = {
    enable = true;
    autoStart = true;
    capSysAdmin = true; # Required for KMS screen capture (especially on Wayland)
    openFirewall = true; # Automatically opens required ports for Moonlight
  };

  # Enable Avahi so Moonlight automatically discovers your PC on the network
  services.avahi = {
    enable = true;
    publish.enable = true;
    publish.userServices = true;
  };

  # Enable CUPS to print documents.
  services.printing.enable = false;

  # Enable sound with pipewire (optional, can be disabled for jumpbox)
  hardware.pulseaudio.enable = false;
  services.pipewire = {
    enable = false; # Disable for lightweight VM
  };

  # Define a user account.
  programs.zsh.enable = true;
  users.users.rogueking = {
    isNormalUser = true;
    description = "rogueking";
    extraGroups = ["networkmanager" "wheel"];
    shell = pkgs.zsh;
    packages = with pkgs; [];
  };

  # Install firefox for web access.
  programs.firefox.enable = true;

  # Allow unfree packages
  nixpkgs.config.allowUnfree = true;

  # Enable OpenSSH daemon for remote access
  services.openssh = {
    enable = true;
    ports = [22];
    settings = {
      PasswordAuthentication = true;
      AllowUsers = ["rogueking"];
      UseDns = true;
      X11Forwarding = true; # Enable X11 forwarding for jumpbox
      PermitRootLogin = "no";
      MaxAuthTries = 8;
    };
  };

  users.users."rogueking".openssh.authorizedKeys.keys = [
    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINXqriPZVIuduc/J7GS1mD171LL0gIbgEjlImsxedWVX"
  ];

  # Minimal firewall configuration
  networking.firewall = {
    enable = true;
    allowedTCPPorts = [22];
    logRefusedConnections = true;
  };

  # List packages installed in system profile.
  environment.systemPackages = with pkgs; [
    # GUI tools
    firefox
    putty
    btrfs-progs
  ];

  fonts.packages = with pkgs; [
    nerd-fonts.hack
    dejavu_fonts
  ];

  home-manager = {
    extraSpecialArgs = {
      inherit
        configPath
        inputs
        pkgs-unstable
        hostname
        hostTypes
        ;
    };
    users = {
      "rogueking" = import ./../../home-manager/home.nix;
    };
    backupFileExtension = "backup";
  };

  system.stateVersion = "26.05";
}