{
  description = "Example Darwin system flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    nix-darwin.url = "github:LnL7/nix-darwin";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
    railbird-secrets = {
      url = "git+ssh://gitea@dev.railbird.ai:1123/railbird/secrets-flake.git";
    };
    nix-homebrew.url = "github:zhaofengli-wip/nix-homebrew";

    # Optional: Declarative tap management
    homebrew-core = {
      url = "github:homebrew/homebrew-core";
      flake = false;
    };
    homebrew-cask = {
      url = "github:homebrew/homebrew-cask";
      flake = false;
    };
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager, ... }:
  let
    libDir = ../dotfiles/lib;
    configuration = { pkgs, config, ... }: {
      networking.hostName = "mac-demarco-mini";
      imports = [ (import ./gitea-actions-runner.nix) ];
      services.gitea-actions-runner = {
        user = "gitearunner";
        instances.nix = {
          enable = true;
          name = config.networking.hostName;
          url = "https://dev.railbird.ai";
          token = "H0A7YXAWsKSp9QzvMymfJI12hbxwR7UerEHpCJUe";
          labels = [
            "nix-darwin-${pkgs.system}:host"
            "macos-aarch64-darwin"
            "nix:host"
          ];
          settings = {
            cache = {
              enabled = true;
            };
            host = {
              workdir_parent = "/var/lib/gitea-runner/action-cache-dir";
            };
          };
          hostPackages = with pkgs; [
            bash
            coreutils
            curl
            direnv
            gawk
            git-lfs
            gitFull
            gnused
            ncdu
            nixFlakes
            nodejs
            openssh
            wget
          ];
        };
      };

      launchd.daemons.gitea-runner-nix.serviceConfig.EnvironmentVariables = {
        XDG_CONFIG_HOME = "/var/lib/gitea-runner";
        XDG_CACHE_HOME = "/var/lib/gitea-runner/.cache";
      };
      nixpkgs.overlays = [(import ../nixos/overlay.nix)];
      environment.systemPackages = with pkgs; [
        python-with-my-packages
	      emacs
        alejandra
        cocoapods
        gitFull
        just
        tmux
        htop
        nodePackages.prettier
        nodejs
        ripgrep
        slack
        typescript
        vim
        yarn
      ];

      nixpkgs.config.allowUnfree = true;


      # Auto upgrade nix package and the daemon service.
      services.nix-daemon.enable = true;
      launchd.user.envVariables.PATH = config.environment.systemPath;

      programs.direnv.enable = true;

      # Necessary for using flakes on this system.
      nix.settings.experimental-features = "nix-command flakes";


      # Set Git commit hash for darwin-version.
      system.configurationRevision = self.rev or self.dirtyRev or null;

      # Used for backwards compatibility, please read the changelog before changing
      system.stateVersion = 4;

      # The platform the configuration will be used on.
      nixpkgs.hostPlatform = "aarch64-darwin";
      users.users.kat.openssh.authorizedKeys.keys = inputs.railbird-secrets.keys.kanivanKeys;
      users.users.gitea-runner = {
         name = "gitea-runner";
         isHidden = false;
         home = "/Users/gitea-runner";
         createHome = false;
       };

      home-manager.useGlobalPkgs = true;      home-manager.useUserPackages = true;

      users.users.kat = {
        name = "kat";
        home = "/Users/kat";
      };

      programs.zsh = {
        enable = true;
        shellInit = ''
          fpath+="${libDir}/functions"
          for file in "${libDir}/functions/"*
          do
          autoload "''${file##*/}"
          done
        '';
        interactiveShellInit = ''
          # eval "$(register-python-argcomplete prb)"
          # eval "$(register-python-argcomplete prod-prb)"
          # eval "$(register-python-argcomplete railbird)"
          # [ -n "$EAT_SHELL_INTEGRATION_DIR" ] && source "$EAT_SHELL_INTEGRATION_DIR/zsh"

          autoload -Uz bracketed-paste-magic
          zle -N bracketed-paste bracketed-paste-magic
        '';
      };

      home-manager.users.kat = {
        programs.starship = {
          enable = true;
        };
        home.stateVersion = "24.05";
      };
    };
  in
  {
    darwinConfigurations."mac-demarco-mini" = nix-darwin.lib.darwinSystem {
      modules = [
        home-manager.darwinModules.home-manager
        configuration
      ];
    };

    # Expose the package set, including overlays, for convenience.
    darwinPackages = self.darwinConfigurations."Kats-Mac-mini".pkgs;
  };
}