{
  description = "Thor system configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/release-22.05";
    home-manager = {
      url = "github:nix-community/home-manager/release-22.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nixpkgs-u.url = "github:NixOS/nixpkgs/nixos-unstable";
    # home-manager-u = {
    #   url = "github:nix-community/home-manager";
    #   inputs.nixpkgs.follows = "nixpkgs-u";
    # };

    flake-utils.url = "github:numtide/flake-utils";
    nixos-hardware.url = "github:NixOS/nixos-hardware";

    nix-rice = {
      url = "github:bertof/nix-rice";
      inputs = {
        inxpkgs.follows = "nixpkgs-u";
        flake-utils.follows = "flake-utils";
      };
    };
    pre-commit-hooks = {
      url = "github:cachix/pre-commit-hooks.nix";
      inputs = {
        nixpkgs.follows = "nixpkgs-u";
        flake-utils.follows = "flake-utils";
      };
    };
    tex2nix = {
      url = "github:Mic92/tex2nix";
      inputs = {
        nixpkgs.follows = "nixpkgs-u";
        flake-utils.follows = "flake-utils";
      };
    };
  };

  outputs =
    { self
    , nixpkgs
    , home-manager
    , nixpkgs-u
      # , home-manager-u
    , flake-utils
    , nixos-hardware
    , tex2nix
    , nix-rice
    , pre-commit-hooks
    }:
    let
      overlaysBuilder = system: [
        (_: _: {
          inherit (tex2nix.packages.${system}) tex2nix;
          stable = pkgs { inherit system; };
          unstable = pkgs-u { inherit system; };
        })
        (nix-rice.overlays.default)
        (import ./rice.nix)
        (final: _: {
          update-background = final.callPackage ./custom/update-background {
            backgrounds_directory = "$HOME/Immagini/Sfondi/1080+/1440+";
          };
          lockscreen = final.callPackage ./custom/lockscreen {
            palette = final.rice.colorPalette;
            font = final.rice.font.normal;
          };
          sddm-theme-clairvoyance =
            final.callPackage ./custom/sddm-theme-clairvoyance {
              wallpaper = ./wallpapers/comfy_waves.jpg;
            };
        })
      ];
      defaultConfig = {
        extraOptions = "experimental-features = nix-command flakes";
        allowUnfree = true;
        permittedInsecurePackages = [ "electron-9.4.4" ]; # authy dependency
      };
      nixpkgsSettings =
        { system, overlays ? overlaysBuilder system, config ? defaultConfig }: {
          inherit system overlays config;
        };
      pkgs = s: import nixpkgs (nixpkgsSettings s);
      pkgs-u = s: import nixpkgs-u (nixpkgsSettings s);
      homeManagerSettings = {
        home-manager = {
          useGlobalPkgs = true;
          useUserPackages = true;
        };
      };

      commonBaseModules = [
        ./nixos_modules/bertof_user.nix
        ./nixos_modules/automatic-garbage-collection.nix
        ./nixos_modules/zerotier.nix
      ];

      homeManagerModules = users: [
        home-manager.nixosModules.home-manager
        homeManagerSettings
        { home-manager.users = users; }
      ];
      # homeManagerUModules = users: [
      #   home-manager-u.nixosModules.home-manager
      #   homeManagerSettings
      #   { home-manager.users = users; }
      # ];

      odinBaseModules = [
        ./odin/hardware-configuration.nix
        nixos-hardware.nixosModules.common-cpu-intel
        nixos-hardware.nixosModules.common-pc-laptop
        nixos-hardware.nixosModules.common-pc-laptop-ssd
        ./odin/common_configuration.nix

        ./nixos_modules/pro_audio.nix
        ./nixos_modules/sesar.nix
      ];
      odinIntelModules = [ ./odin/configuration-intel.nix ];
      odinNvidiaModules = [ ./odin/configuration-nvidia.nix ];

      odinIntelBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ odinBaseModules ++ odinIntelModules
            ++ (homeManagerModules { bertof = import ./odin/hm.nix; })
            ++ extraModules;
        };
      odinNvidiaBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ odinBaseModules ++ odinNvidiaModules
            ++ (homeManagerModules { bertof = import ./odin/hm.nix; })
            ++ extraModules;
        };

      thorBaseModules = [
        ./thor/hardware-configuration.nix
        nixos-hardware.nixosModules.common-cpu-amd
        nixos-hardware.nixosModules.common-pc-ssd
        ./thor/configuration.nix

        ./nixos_modules/pro_audio.nix
        ./nixos_modules/sesar.nix
        ./nixos_modules/pentablet.nix
      ];
      thorBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ thorBaseModules
            ++ (homeManagerModules { bertof = import ./thor/hm.nix; })
            ++ extraModules;
        };

      lokiBaseModules = [
        ./loki/hardware-configuration.nix
        nixos-hardware.nixosModules.common-cpu-intel
        nixos-hardware.nixosModules.common-pc-ssd
        ./loki/configuration.nix
      ];
      lokiBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ lokiBaseModules
            ++ (homeManagerModules { bertof = import ./loki/hm.nix; })
            ++ extraModules;
        };

      freyaBaseModules = [
        # ./freya/hardware-configuration.nix
        nixos-hardware.nixosModules.raspberry-pi."4"
        ./freya/configuration.nix
      ];
      freyaBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ freyaBaseModules
            ++ (homeManagerModules { bertof = import ./freya/hm.nix; })
            ++ extraModules;
        };

      baldurBaseModules = [ ./baldur/configuration.nix ];
      balurBuilder = { extraModules ? [ ] }:
        nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [{ nixpkgs = nixpkgsSettings { inherit system; }; }]
            ++ commonBaseModules ++ baldurBaseModules
            ++ (homeManagerModules { bertof = import ./baldur/hm.nix; })
            ++ extraModules;
        };
    in
    (flake-utils.lib.eachDefaultSystem (system: rec {
      packages = pkgs-u { inherit system; };

      checks = {
        pre-commit-check = pre-commit-hooks.lib.${system}.run {
          src = ./.;
          hooks = {
            nixpkgs-fmt.enable = true;
            nix-linter.enable = true;
          };
        };
      };

      devShells.default = packages.mkShell {
        shellHook = ''
          ${self.checks.${system}.pre-commit-check.shellHook}
        '';
      };
    })) // {
      nixosConfigurations = rec {

        thor = thorBuilder { };

        odin = odin-intel;
        odin-intel = odinIntelBuilder { };
        odin-nvidia = odinNvidiaBuilder { };

        loki = lokiBuilder { };
        # loki-stable = lokiStable [ ./nixos_modules/dnsmasq.nix ];
        # loki-k3s = lokiStable [ ./nixos_modules/k3s.nix ];
        # loki-unstable = lokiUnstable [ ];

        freya = freyaBuilder { };
        baldur = balurBuilder { };
      };
    };
}