{
  description = "System config";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.05";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";

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

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


  };

  outputs = { nixpkgs, home-manager, ... }@inputs:
    let

      defSystem = systemArch: baseConfig:
        nixpkgs.lib.nixosSystem {
          system = "${systemArch}";
          modules = [
            { _module.args.inputs = inputs; }
            { _module.args.self-overlay = self.overlay; }
            { _module.args.overlay-unstable = self.overlay-unstable; }
            ({ ... }: {
              imports = builtins.attrValues self.nixosModules ++ [
                {
                  nix.nixPath = [ "nixpkgs=${nixpkgs}" ];
                  nixpkgs.overlays = [ self.overlay self.overlay-unstable ];
                }

                baseConfig
                home-manager.nixosModules.home-manager
                { home-manager.useUserPackages = true; }
              ];

              system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
              nix.registry.nixpkgs.flake = nixpkgs;
            })
          ];
        };

      # nixosUsers = [{
      #   name = "erwin";
      #   groups = [ "wheel" "networkmanager" "video" ];
      #   uid = 1000;
      #   shell = pkgs.fish;
      #   openssh.authorizedKeys.keys = [
      #     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMNoTcRsAxDwpiIj6nhUXwzSQjtcgKCR0RDlzP57wi0W erwin@horusvr-ws2"
      #   ];
      # }];

    in
    {
      # homeManagerConfigurations = {
      #   erwin = user.mkHMUser {
      #     userConfig = {
      #       git.enable = true;
      #       ssh.enable = true;
      #       applications.enable = true;
      #       gpg.enable = true;
      #       fish.enable = true;
      #       sway.enable = true;
      #     };
      #     username = "erwin";
      #   };
      # };

      overlay = final: prev: (import ./overlays) final prev;
      overlay-unstable = final: prev: {
        unstable = import nixpkgs-unstable {
          system = "x86_64-linux";
          config.allowUnfree = true;
        };
      };

      nixosModules = builtins.listToAttrs (map
        (x: {
          name = x;
          value = import (./modules + "/${x}");
        })
        (builtins.attrNames (builtins.readDir ./modules)));

      nixosConfigurations = {
        # vm1 = host.mkHost {
        #   name = "vm1";
        #   NICs = [ "enp1s0" ];
        #   kernelPackage = pkgs.linuxPackages;
        #   initrdMods = [ "ahci" "xhci_pci" "sr_mod" ];
        #   kernelMods = [ "kvm-amd" ];
        #   kernelParams = [ ];
        #   systemConfig = vm1UefiConfig;

        #   users = nixosUsers;

        #   cpuCores = 6;
        # };

        # vm2 = host.mkHost {
        #   name = "vm2";
        #   NICs = [ "enp1s0" ];
        #   kernelPackage = pkgs.linuxPackages;
        #   initrdMods = [ "ahci" "xhci_pci" "sr_mod" ];
        #   kernelMods = [ "kvm-amd" ];
        #   kernelParams = [ ];
        #   systemConfig = vm2Config;

        #   users = nixosUsers;

        #   cpuCores = 4;
        # };
        vm2 = defSystem "x86_64-linux" {
          imports = [
            (import (./machines/vm2/configuration.nix) { inherit self; })
          ];
        };

        # loki = defSystem "x86_64-linux" {
        #   imports = [
        #     (import (./machines/loki/configuration.nix) { inherit self; })
        #   ];
        # };

      };
    }
      (flake-utils.lib.eachSystem [ "x86_64-linux" ])
      (system:
        let
          pkgs = import nixpkgs {
            inherit system;
            overlays = [ self.overlay ];
            config = {
              allowUnsupportedSystem = true;
              allowUnfree = true;
            };
          };
        in
        rec {
          packages = flake-utils.lib.flattenTree {
            rofi-wayland = pkgs.rofi-wayland;
          };

          apps = {
            rofi-wayland = flake-utils.lib.mkApp { drv = packages.rofi-wayland; };
          };
        }
      );
}