{
  description = "thelio-b1";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
  };

  outputs = { self, nixpkgs, ... }@inputs: {
    nixosConfigurations = {
      "thelio-b1" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          # Import the configuration.nix we used before, so that the old configuration file can still take effect. 
          # Note: /etc/nixos/configuration.nix itself is also a Nix Module, so you can import it directly here
#          ./configuration.nix
          ./hardware-configuration.nix

          ({config, pkgs, ...}: {
             nix = {
                settings.auto-optimise-store = true;
                settings.experimental-features = [ "nix-command" "flakes" ];
           
                gc = {
                   automatic = true;
                   dates = "weekly";
                   options = "--delete-older-than 30d";
                };
             };

             nixpkgs.config.allowUnfree = true; 

             boot = {
                # kernelPackages = pkgs.linuxPackages_latest;
                kernelParams = [ "console=ttyS0,1920n8" ];

                binfmt.emulatedSystems = [ "aarch64-linux" ];

                loader.systemd-boot.enable = true;
                loader.systemd-boot.consoleMode = "0";
             };
             
             networking = {
                hostName = "thelio-b1";
                networkmanager.enable = true;
             };

             users.users.aaronh = {
                isNormalUser = true;
                extraGroups = [ "wheel" "networkmanager" ]; # Enable ‘sudo’ for the user.
                packages = with pkgs; [
                   cargo
                   git
                   git-lfs
                   mdbook
                   neofetch
                   restic
                   roboto-slab

                   firefox
                ];
             };

             environment.systemPackages = with pkgs; [
                avahi
                dmidecode
                libcamera
                lshw
                nix-index
                sysstat
                tree
                unzip
                wget
             ];

             hardware.pulseaudio.enable = false;
             
             security.rtkit.enable = true;
             services.pipewire = {
               enable = true;
               alsa.enable = true;
               alsa.support32Bit = true;
               pulse.enable = true;
             };

             services = {
               fwupd.enable = true;
               printing.enable = true;
               openssh.enable = true;
             };
 
             services.avahi = {
               enable = true;
               nssmdns = true;
               openFirewall = true;
             };
  
             system = {
                stateVersion = "23.05";
                autoUpgrade.enable = true;
             };
          })
        ];
      };
    };
  };
}