{
  description = "NixOS configuration with flakes";
  outputs = { self, flake-utils, home-manager, nixpkgs-nixos-unstable, nixpkgs-stable, nixos-hardware, nur, agenix, neuron, sops } @ inputs:

    let
      mkServer = pkgs: system: hostname:
        pkgs.lib.nixosSystem {
          system = system;
          modules = [
            (./. + "/nixos/boxes/${hostname}")
            agenix.nixosModules.age
            sops.nixosModules.sops
          ];
          specialArgs = { inherit inputs; };
        };
      mkRaspi = pkgs: hostname:
        pkgs.lib.nixosSystem {
          system = "aarch64-linux";
          modules = [
            (./. + "/nixos/boxes/${hostname}")
          ];
          specialArgs = { inherit inputs; };
        };
      mkWorkstation = pkgs: system: hostname:
        pkgs.lib.nixosSystem {
          system = system;
          modules = [
            (./. + "/nixos/boxes/${hostname}")
            (import ./nixos/email-accounts.nix)
            sops.nixosModules.sops

            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users.cyryl = {
                imports = [ ./nixos/home-manager ];
                _module.args.inputs = inputs;
              };
            }

          ];
          specialArgs = {
            inherit inputs system;
            unstableAndUnfree = import nixpkgs-nixos-unstable { inherit system; config = { allowUnfree = true; }; };
          };
        };
    in

    {
      nixosConfigurations = {
        foureighty = mkWorkstation nixpkgs-stable "x86_64-linux" "foureighty";
        skinnyv = mkWorkstation nixpkgs-stable "x86_64-linux" "skinnyv";
        thinky = mkWorkstation nixpkgs-stable "x86_64-linux" "thinky";
        bolty = mkServer nixpkgs-stable "x86_64-linux" "bolty";
        vultr1 = mkServer nixpkgs-stable "x86_64-linux" "vultr1";
        rpi4_8 = mkRaspi nixpkgs-stable "rpi4-8";

        bootstrap = nixpkgs-stable.lib.nixosSystem {
          system = "x86_64-linux";
          modules = [
            (./. + "/nixos/boxes/bootstrap")
          ];
          specialArgs = { inherit inputs; };
        };
        # nix build .#nixosConfigurations.raspiimage.config.system.build.sdImage
        # sudo dd if=result/sd-image/nixos-sd-image-21.11.20211201.a640d83-aarch64-linux.img of=/dev/sda bs=4M conv=fsync status=progress
        raspiimage = nixpkgs-stable.lib.nixosSystem {
          system = "aarch64-linux";
          modules = [
            (import "${inputs.nixpkgs-nixos-unstable}/nixos/modules/installer/sd-card/sd-image-aarch64-installer.nix")
            {
              services.openssh = {
                enable = true;
                permitRootLogin = inputs.nixpkgs-stable.lib.mkForce "prohibit-password";
                passwordAuthentication = false;
              };
              users.extraUsers.root.openssh.authorizedKeys.keys = [
                "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE5Ejx5CAPUfHVXi4GL4WmnZaG8eiiOmsW/a0o1bs1GF cyryl@foureighty"
              ];
              sdImage.compressImage = false;
              console.earlySetup = true;
            }
          ];
          specialArgs = { inherit inputs; };
        };
      };
    };
  inputs = {
    nixpkgs-nixos-unstable = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "nixos-unstable";
    };

    nixpkgs-stable = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "nixos-21.11";
    };

    nixos-hardware = {
      type = "github";
      owner = "NixOS";
      repo = "nixos-hardware";
      ref = "master";
    };

    home-manager = {
      type = "github";
      owner = "nix-community";
      repo = "home-manager";
      ref = "release-21.11";
      inputs = {
        nixpkgs.follows = "nixpkgs-stable";
      };
    };

    flake-utils = {
      type = "github";
      owner = "numtide";
      repo = "flake-utils";
      ref = "master";
    };

    nur = {
      type = "github";
      owner = "nix-community";
      repo = "NUR";
      ref = "master";
    };

    agenix = {
      type = "github";
      owner = "ryantm";
      repo = "agenix";
      ref = "main";
    };

    neuron = {
      type = "github";
      owner = "srid";
      repo = "neuron";
      ref = "master";
    };

    sops = {
      type = "github";
      owner = "Mic92";
      repo = "sops-nix";
      ref = "master";
    };
  };

}