{
  inputs = {
    # Principle inputs (updated by `nix run .#update`)
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nix-darwin.url = "github:lnl7/nix-darwin/master";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    flake-parts.url = "github:hercules-ci/flake-parts";
    nixos-flake.url = "github:srid/nixos-flake";

    terranix.url = "github:terranix/terranix";
  };

  outputs = inputs@{ self, terranix, ... }:
    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" ];

      imports = [
        inputs.nixos-flake.flakeModule
        ./terraform.nix
      ];

      perSystem = { config, ... }: { };

      flake =
        let
          # TODO: Change username
          myUserName = "john";
          system = "x86_64-linux";
        in
        {
          # Configurations for Linux (NixOS) machines
          nixosConfigurations = {
            # TODO: Change hostname from "example1" to something else.
            example1 = self.nixos-flake.lib.mkLinuxSystem "x86_64-linux" {
              imports = [
                self.nixosModules.common # See below for "nixosModules"!
                self.nixosModules.linux
                ./hosts/example1/default.nix
                self.nixosModules.home-manager
                {
                  home-manager.users.${myUserName} = {
                    imports = [
                      self.homeModules.common # See below for "homeModules"!
                      self.homeModules.linux
                    ];
                    home.stateVersion = "22.11";
                  };
                }
              ];
            };
          };

          # Configurations for macOS machines
          darwinConfigurations = {
            # TODO: Change hostname from "example1" to something else.
            example1 = self.nixos-flake.lib.mkMacosSystem "aarch64-darwin" {
              imports = [
                self.nixosModules.common # See below for "nixosModules"!
                self.nixosModules.darwin
                ./hosts/example1/default.nix
                self.darwinModules.home-manager
                {
                  home-manager.users.${myUserName} = {
                    imports = [
                      self.homeModules.common # See below for "homeModules"!
                      self.homeModules.darwin
                    ];
                    home.stateVersion = "22.11";
                  };
                }
              ];
            };
          };

          # All nixos/nix-darwin configurations are kept here.
          nixosModules = {
            # Common nixos/nix-darwin configuration shared between Linux and macOS.
            common = { pkgs, ... }: {
              environment.systemPackages = with pkgs; [
                hello
              ];
            };
            # NixOS specific configuration
            linux = { pkgs, ... }: {
              users.users.${myUserName}.isNormalUser = true;
              services.netdata.enable = true;
            };
            # nix-darwin specific configuration
            darwin = { pkgs, ... }: {
              security.pam.enableSudoTouchIdAuth = true;
            };
          };

          # All home-manager configurations are kept here.
          homeModules = {
            # Common home-manager configuration shared between Linux and macOS.
            common = { pkgs, ... }: {
              programs.git.enable = true;
              programs.starship.enable = true;
              programs.bash.enable = true;
            };
            # home-manager config specific to NixOS
            linux = {
              xsession.enable = true;
            };
            # home-manager config specifi to Darwin
            darwin = {
              targets.darwin.search = "Bing";
            };
          };
        };
    };
}