{
  description = "Thor system configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/release-21.11";

    home-manager = {
      url = "github:nix-community/home-manager/release-21.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

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

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

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

    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };

    tex2nix = {
      url = github:Mic92/tex2nix;
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "flake-utils";
    };
  };

  outputs =
    { self
    , nixpkgs
    , home-manager
    , unstable
    , home-manager-unstable
    , flake-utils
    , nixos-hardware
    , rust-overlay
    , tex2nix
    }:
    let
      system = "x86_64-linux";
      overlays = [
        (import ./rice.nix)
        (rust-overlay.overlay)
        (final: prev: { inherit (tex2nix.packages.${system}) tex2nix; })
        (final: prev: {
          # cocktail-bar-cli = final.callPackage ./custom/cocktail-bar-cli { };
          update-background = final.callPackage ./custom/update-background { backgrounds_directory = "$HOME/Immagini/Sfondi/1080+/1440+"; };
          lockscreen = final.callPackage ./custom/lockscreen {
            palette = final.rice.colorPalette;
            font = final.rice.font.normal;
          };
        })
      ];
      nixpkgsSettings = {
        inherit overlays system;
        config = {
          allowUnfree = true;
          permittedInsecurePackages = [ "electron-9.4.4" ]; # authy dependency
        };
      };
      pkgs = import nixpkgs nixpkgsSettings;
      unstablePkgs = import nixpkgs nixpkgsSettings;

      odinBaseModules = [
        { nixpkgs = nixpkgsSettings; }
        ./odin/hardware-configuration.nix
        nixos-hardware.nixosModules.common-cpu-intel
        nixos-hardware.nixosModules.common-pc-laptop
        nixos-hardware.nixosModules.common-pc-laptop-ssd
        ./odin/base.nix
        home-manager-unstable.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          # home-manager.nixpkgs.overlays = overlays;
          home-manager.users.bertof = import ./odin.nix;
        }
      ];

      odinStableBaseModules = odinBaseModules ++ [
        home-manager.nixosModules.home-manager
      ];

      odinUnstableBaseModules = odinBaseModules ++ [
        home-manager-unstable.nixosModules.home-manager
      ];


      thorBaseModules = [
        { nixpkgs = nixpkgsSettings; }
        ./thor/hardware-configuration.nix
        nixos-hardware.nixosModules.common-cpu-amd
        nixos-hardware.nixosModules.common-pc-ssd
        {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          # home-manager.nixpkgs.overlays = overlays;
          home-manager.users.bertof = import ./thor.nix;
        }
        ./thor/configuration.nix
      ];

      thorStableBaseModules = thorBaseModules ++ [
        home-manager.nixosModules.home-manager
      ];

      thorUnstableBaseModules = thorBaseModules ++ [
        home-manager-unstable.nixosModules.home-manager
      ];

    in
    {
      exports = {
        inherit pkgs unstablePkgs;
      };

      nixosConfigurations = rec {

        thor = thor-unstable;

        thor-stable = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = thorStableBaseModules ++ [ ./nixos_modules/pro_audio.nix ];
        };

        thor-unstable = unstable.lib.nixosSystem {
          inherit system;
          modules = thorUnstableBaseModules ++ [ ./nixos_modules/pro_audio.nix ];
        };

        thor-big-data = unstable.lib.nixosSystem {
          inherit system;
          modules = thorUnstableBaseModules ++ [ ./nixos_modules/pro_audio.nix ./nixos_modules/big_data.nix ];
        };

        odin = odin-nvidia-big-data-unstable;

        odin-intel = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = odinStableBaseModules ++ [ ./odin/odin-intel.nix ./nixos_modules/pro_audio.nix ];
        };

        odin-nvidia = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = odinStableBaseModules ++ [ ./odin/odin-nvidia.nix ./nixos_modules/pro_audio.nix ];
        };

        odin-intel-unstable = unstable.lib.nixosSystem {
          inherit system;
          modules = odinUnstableBaseModules ++ [ ./odin/odin-intel.nix ./nixos_modules/pro_audio.nix ];
        };

        odin-nvidia-unstable = unstable.lib.nixosSystem {
          inherit system;
          modules = odinUnstableBaseModules ++ [ ./odin/odin-nvidia.nix ./nixos_modules/pro_audio.nix ];
        };

        odin-intel-big-data-unstable = unstable.lib.nixosSystem {
          inherit system;
          modules = odinUnstableBaseModules ++ [
            ./odin/odin-intel.nix
            ./nixos_modules/pro_audio.nix
            ./nixos_modules/big_data.nix
          ];
        };

        odin-nvidia-big-data-unstable = unstable.lib.nixosSystem {
          inherit system;
          modules = odinUnstableBaseModules ++ [
            ./odin/odin-nvidia.nix
            ./nixos_modules/pro_audio.nix
            ./nixos_modules/big_data.nix
          ];
        };

      };
    };
}