{
  description = "NixOS configs";

  nixConfig = {
    extra-substituters = [
      "https://binarycache.k3t.dev"
      "https://nix-community.cachix.org"

    ];
    extra-trusted-public-keys = [
      "binarycache.k3t.dev:cmIg4sWTZ729F1yEF2AYLtSbUXJGFYwM6tzYYF18qts="
      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
    ];
  };

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    impermanence.url = "github:nix-community/impermanence";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
    home-manager.url = "github:nix-community/home-manager";
    spicetify-nix.url = "github:Gerg-L/spicetify-nix";
    nix-mineral.url = "github:cynicsketch/nix-mineral/";
  };

  outputs = { self, nixpkgs, impermanence, nixos-hardware, home-manager, spicetify-nix, nix-mineral, ... }:
  let
    mkHost = system: modules: nixpkgs.lib.nixosSystem {
      inherit system modules;
      specialArgs = { inherit impermanence nixos-hardware spicetify-nix nix-mineral; };
    };

    mkPiImage = modules: (nixpkgs.lib.nixosSystem {
      system = "aarch64-linux";
      specialArgs = { inherit impermanence nixos-hardware home-manager; };
      modules = [
        "${nixpkgs}/nixos/modules/installer/sd-card/sd-image-aarch64.nix"
        impermanence.nixosModules.impermanence
        nixos-hardware.nixosModules.raspberry-pi-4
        home-manager.nixosModules.home-manager
      ] ++ modules;
    }).config.system.build.sdImage;
  in {

    nixosConfigurations = {
      # repurposed for use as nas
      #"TheBlackBox" = mkHost "x86_64-linux" [
      #  ./modules/common.nix
      #  ./modules/desktop-common.nix
      #  ./hosts/desktop/configuration.nix
      #  spicetify-nix.nixosModules.spicetify
      #  home-manager.nixosModules.home-manager
      #  {
      #    home-manager.useGlobalPkgs = true;
      #    home-manager.useUserPackages = true;
      #    home-manager.users.k3t = ./home/desktop.nix;
      #  }
      #];
      "TheBlackBox" = mkHost "x86_64-linux" [
        ./modules/audio/base.nix
        ./modules/audio/zeroconf.nix

        ./modules/bluetooth/desktop.nix
        ./modules/de/kde.nix
        ./modules/de/i3.nix
        ./modules/desktop-common.nix
        
        ./modules/gui/services/fcast.nix
        ./modules/gui/apps/firefox.nix
        ./modules/gui/apps/spicetify.nix
        ./modules/gui/apps/steam.nix
        ./modules/gui/fonts.nix
        ./modules/gui/services/flatpak.nix
        ./modules/gui/services/kdeconnect.nix
        ./modules/gui/services/kwallet.nix
        ./modules/gui/services/xdg.nix
        
        ./modules/net/services/avahi.nix
        ./modules/net/services/fail2ban.nix
        ./modules/net/services/networkmanager.nix
        ./modules/net/services/printing.nix
        ./modules/net/services/tailscale.nix
        
        ./modules/sys/compat.nix
        ./modules/sys/firewall.nix
        ./modules/sys/fs/btrfs.nix
        ./modules/sys/hw/boot.nix
        ./modules/sys/hw/cpu/amd64.nix
        ./modules/sys/hw/gpu/amd.nix
        ./modules/sys/nix.nix
        ./modules/sys/perf.nix
        ./modules/sys/pkgs.nix
        ./modules/sys/rc/openssh.nix
        ./modules/sys/rc/sunshine.nix
        ./modules/sys/rgb.nix
        ./modules/sys/security.nix
        ./modules/sys/shell.nix
        ./modules/sys/stateversion.nix
        ./modules/sys/sysctl.nix
        ./modules/sys/time.nix
        ./modules/sys/users.nix
        ./modules/sys/vm.nix

        ./hosts/TheBlackBox/configuration.nix
        spicetify-nix.nixosModules.spicetify
        home-manager.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.k3t = ./home/desktop.nix;
        }
      ];
      "htpc" = mkHost "x86_64-linux" [
        ./modules/audio/base.nix
        ./modules/audio/zeroconf.nix

        ./modules/bluetooth/desktop.nix
        ./modules/de/kde.nix
        ./modules/de/i3.nix
        ./modules/desktop-common.nix
        
        ./modules/gui/services/fcast.nix
        ./modules/gui/apps/firefox.nix
        ./modules/gui/apps/spicetify.nix
        ./modules/gui/apps/steam.nix
        ./modules/gui/fonts.nix
        ./modules/gui/services/flatpak.nix
        ./modules/gui/services/kdeconnect.nix
        ./modules/gui/services/kwallet.nix
        ./modules/gui/services/xdg.nix
        
        ./modules/net/services/avahi.nix
        ./modules/net/services/fail2ban.nix
        ./modules/net/services/networkmanager.nix
        ./modules/net/services/printing.nix
        ./modules/net/services/tailscale.nix
        
        ./modules/sys/compat.nix
        ./modules/sys/firewall.nix
        ./modules/sys/fs/btrfs.nix
        ./modules/sys/hw/boot.nix
        ./modules/sys/hw/cpu/amd64.nix
        ./modules/sys/hw/gpu/amd.nix
        ./modules/sys/nix.nix
        ./modules/sys/perf.nix
        ./modules/sys/pkgs.nix
        ./modules/sys/rc/openssh.nix
        ./modules/sys/rc/sunshine.nix
        ./modules/sys/rgb.nix
        ./modules/sys/security.nix
        ./modules/sys/shell.nix
        ./modules/sys/stateversion.nix
        ./modules/sys/sysctl.nix
        ./modules/sys/time.nix
        ./modules/sys/users.nix

        ./hosts/htpc/configuration.nix
        spicetify-nix.nixosModules.spicetify
        home-manager.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.k3t = ./home/desktop.nix;
        }
      ];
      "T14" = mkHost "x86_64-linux" [
        ./modules/audio/base.nix
        ./modules/audio/zeroconf.nix

        ./modules/bluetooth/desktop.nix
        ./modules/de/kde.nix
        ./modules/de/i3.nix
        ./modules/desktop-common.nix
        
        ./modules/gui/services/fcast.nix
        ./modules/gui/apps/firefox.nix
        ./modules/gui/apps/spicetify.nix
        ./modules/gui/apps/steam.nix
        ./modules/gui/fonts.nix
        ./modules/gui/services/flatpak.nix
        ./modules/gui/services/kdeconnect.nix
        ./modules/gui/services/kwallet.nix
        ./modules/gui/services/xdg.nix
        
        ./modules/net/services/avahi.nix
        ./modules/net/services/fail2ban.nix
        ./modules/net/services/networkmanager.nix
        ./modules/net/services/printing.nix
        ./modules/net/services/tailscale.nix
        
        ./modules/sys/compat.nix
        ./modules/sys/firewall.nix
        ./modules/sys/fs/btrfs.nix
        ./modules/sys/hw/boot.nix
        ./modules/sys/hw/cpu/amd64.nix
        ./modules/sys/hw/gpu/amd.nix
        ./modules/sys/nix.nix
        ./modules/sys/perf.nix
        ./modules/sys/pkgs.nix
        ./modules/sys/rc/openssh.nix
        ./modules/sys/rc/sunshine.nix
        ./modules/sys/rgb.nix
        ./modules/sys/security.nix
        ./modules/sys/shell.nix
        ./modules/sys/stateversion.nix
        ./modules/sys/sysctl.nix
        ./modules/sys/time.nix
        ./modules/sys/users.nix
        ./modules/sys/vm.nix

        ./hosts/laptop/configuration.nix
        spicetify-nix.nixosModules.spicetify
        home-manager.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.k3t = ./home/desktop.nix;
        }
      ];
      #"pi-htpc" = mkHost "aarch64-linux" [
      #  nixos-hardware.nixosModules.raspberry-pi-4
      #  ./modules/net/services/networkmanager.nix
      #  ./modules/net/services/tailscale.nix
      #  ./modules/sys/compat.nix
      #  ./modules/sys/firewall.nix
      #  ./modules/sys/fs/btrfs.nix
      #  ./modules/sys/hw/boot.nix
      #  ./modules/sys/nix.nix
      #  ./modules/sys/perf.nix
      #  ./modules/sys/pkgs.nix
      #  ./modules/sys/rc/openssh.nix
      #  ./modules/sys/security.nix
      #  ./modules/sys/shell.nix
      #  ./modules/sys/stateversion.nix
      #  ./modules/sys/time.nix
      #  ./modules/sys/users.nix
      #  ./modules/pi-common.nix
      #  ./hosts/pi-htpc-old/configuration.nix
      #  home-manager.nixosModules.home-manager
      #  {
      #    home-manager.useGlobalPkgs = true;
      #    home-manager.useUserPackages = true;
      #    home-manager.users.k3t = ./home/htpc.nix;
      #  }
      #];
      "nixcloud" = mkHost "x86_64-linux" [
        ./modules/net/services/fail2ban.nix
        ./modules/net/services/networkmanager.nix
        ./modules/net/services/tailscale.nix
        ./modules/sys/compat.nix
        ./modules/sys/firewall.nix
        ./modules/sys/fs/btrfs.nix
        ./modules/sys/hw/boot.nix
        ./modules/sys/hw/cpu/arm64.nix
        ./modules/sys/nix.nix
        ./modules/sys/perf.nix
        ./modules/sys/pkgs.nix
        ./modules/sys/rc/openssh.nix
        ./modules/sys/security.nix
        ./modules/sys/shell.nix
        ./modules/sys/stateversion.nix
        ./modules/sys/sysctl.nix
        ./modules/sys/time.nix
        ./modules/sys/users.nix
        ./hosts/nixcloud/configuration.nix
        home-manager.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.k3t = ./home/server.nix;
        }
      ];
    };

    # SD card images
    #images = {
    #  pi-htpc-old = mkPiImage [
    #    ./modules/net/services/networkmanager.nix
    #    ./modules/net/services/tailscale.nix
    #    ./modules/sys/compat.nix
    #    ./modules/sys/firewall.nix
    #    ./modules/sys/fs/btrfs.nix
    #    ./modules/sys/hw/boot.nix
    #    ./modules/sys/nix.nix
    #    ./modules/sys/perf.nix
    #    ./modules/sys/pkgs.nix
    #    ./modules/sys/rc/openssh.nix
    #    ./modules/sys/security.nix
    #    ./modules/sys/shell.nix
    #    ./modules/sys/stateversion.nix
    #    ./modules/sys/time.nix
    #    ./modules/sys/users.nix
    #    ./modules/pi-common.nix
    #    ./hosts/pi-htpc-old/configuration.nix
    #    {
    #      home-manager.useGlobalPkgs = true;
    #      home-manager.useUserPackages = true;
    #      home-manager.users.k3t = ./home/desktop.nix;
    #    }
    #  ];
    #};
  };
}