{ config, pkgs, ... }:

{
  # Bootloader: systemd-boot with EFI support
  boot = {
    loader = {
      systemd-boot.enable = true;
      efi.canTouchEfiVariables = true;
    };

    # Enable support for LUKS
    initrd = {
      luks.devices = {
        "root" = {
          device = "/dev/sda1"; # Change to your actual encrypted partition
          preLVM = true;
          allowDiscards = true; # Enable if using an SSD with TRIM support
        };
      };
      systemd.enable = true; # Required for LUKS support
      availableKernelModules = [ "dm-crypt" "dm-mod", "ext4" ]; # Required for LUKS support
    };
    kernelParams = [ "root=/dev/mapper/root" "cryptdevice=/dev/sda1:root" ]; # Required for LUKS support
  };

  environment.systemPackages = with pkgs; [
    cryptsetup
  ];

  # File systems
  fileSystems."/" = {
    device = "/dev/mapper/root"; # LUKS unlocked device
    fsType = "ext4";
  };

  # EFI partition mount (usually /boot or /boot/efi)
  fileSystems."/boot" = {
    device = "/dev/sda2"; # Change to your actual EFI partition
    fsType = "vfat";
    options = [ "nofail" "defaults" ];
  };

  swapDevices = [{ device = "/swapfile"; size = 4096; }];

  # Locales and timezone
  time.timeZone = "Europe/London";
  i18n.defaultLocale = "en_GB.UTF-8";

  # UFW Firewall
  networking.firewall = {
    enable = true;
    allowedTCPPorts = [ 22 ]; # Allow SSH
  };

  # Enable SSH
  services.openssh = {
    enable = true;
    settings = {
      PermitRootLogin = "no";
      PasswordAuthentication = false;
    };
  };
}