{
  description = "NixOS configuration of DerGrumpf";

  ##################################################################################################################
  #
  # Want to know Nix in details? Looking for a beginner-friendly tutorial?
  # Check out https://github.com/ryan4yin/nixos-and-flakes-book !
  #
  ##################################################################################################################

  # the nixConfig here only affects the flake itself, not the system configuration!
  nixConfig = {
    # substituers will be appended to the default substituters when fetching packages
    # nix com    extra-substituters = [munity's cache server
    extra-substituters = [
      "https://nix-community.cachix.org"
    ];
    extra-trusted-public-keys = [
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
    ];
  };

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
    hyprland.url = "github:hyprwm/Hyprland";
    catppuccin.url = "github:catppuccin/nix";

    home-manager.url = "github:nix-community/home-manager/release-24.11";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    hyprland-plugins = {
        url = "github:hyprwm/hyprland-plugins";
        inputs.hyprland.follows = "hyprland";
    };
  };

  outputs = inputs @ {
    self,
    nixpkgs,
    home-manager,
    catppuccin,
    ...
  }: {
    packages.x86_64-linux.default = self.nixosConfigurations.iso.config.system.build.isoImage;
    nixosConfigurations = {
      iso = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
            ({ pkgs, modulesPath, ... }: {
                imports = [ (modulesPath + "/installer/cd-dvd/installation-cd-minimal.nix") ];
                environment.systemPackages = with pkgs; [
                    neovim 
                    git
                    wget
                    curl
                ];
                nix.settings.experimental-features = ["nix-command" "flakes"];
             })
        ];
      };

      m920q = let
        username = "phil";
        specialArgs = {inherit username;};
      in
        nixpkgs.lib.nixosSystem {
          inherit specialArgs;
          system = "x86_64-linux";

          modules = [
            ./hosts/m920q
            ./users/${username}/nixos.nix

            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;

              home-manager.extraSpecialArgs = inputs // specialArgs;
              home-manager.users.${username} = import ./users/${username}/home.nix;
            }
          ];
        };

      qemu = let
        username = "phil";
        specialArgs = {inherit username;};
      in
        nixpkgs.lib.nixosSystem {
          inherit specialArgs;
          system = "x86_64-linux";

          modules = [
            ./hosts/qemu
            ./users/${username}/nixos.nix

            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;

              home-manager.extraSpecialArgs = inputs // specialArgs;
              home-manager.users.${username} = import ./users/${username}/home.nix;
            }
          ];
        }; 

      hp15-n028sg = let
        username = "phil";
        specialArgs = {inherit username;};
      in
        nixpkgs.lib.nixosSystem {
          inherit specialArgs;
          system = "x86_64-linux";

          modules = [
            ./hosts/hp15-n028sg
            ./users/${username}/nixos.nix

            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;

              home-manager.extraSpecialArgs = inputs // specialArgs;
              home-manager.users.${username} = import ./users/${username}/home.nix;
            }
          ];
        }; 
    };
  };
}