{
  description = "Triston Darwin system Flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    nix-darwin.url = "github:LnL7/nix-darwin";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
    nix-homebrew.url = "github:zhaofengli-wip/nix-homebrew";
  };

  outputs = inputs@{ self, nix-darwin, nixpkgs, nix-homebrew }:

  let
    configuration = { pkgs, config, ... }: {
      # List packages installed in system profile. To search by name, run:
      # $ nix-env -qaP | grep wget

      # allows unfree packages like discord
      nixpkgs.config.allowUnfree = true;

      # ---- ADD NIX APPS HERE ------
      environment.systemPackages =
        [ 
            pkgs.vim
            pkgs.mkalias
            pkgs.alacritty
            pkgs.discord
            pkgs.lazygit
            pkgs.bun
            pkgs.nodejs_22
            pkgs.gnupg
            pkgs.pinentry_mac
            pkgs.rustup
        ];

      # ---- ADD FONTS CONFIGS HERE ------
      fonts.packages = [
        (pkgs.nerdfonts.override { fonts = ["JetBrainsMono"]; })
      ];

      # ---- THIS JUST MOVES NIX APPS ------
      system.activationScripts.applications.text = let
          env = pkgs.buildEnv {
            name = "system-applications";
            paths = config.environment.systemPackages;
            pathsToLink = "/Applications";
          };
        in
            pkgs.lib.mkForce /*bash*/''
              # Set up applications.
              echo "setting up /Applications..." >&2
              rm -rf /Applications/Nix\ Apps
              mkdir -p /Applications/Nix\ Apps
              find ${env}/Applications -maxdepth 1 -type l -exec readlink '{}' + |
              while read src; do
                app_name=$(basename "$src")
                echo "copying $src" >&2
                ${pkgs.mkalias}/bin/mkalias "$src" "/Applications/Nix Apps/$app_name"
              done
            '';
        
        # ---- ADD HOMEBREW APPS HERE ------
        homebrew = {
            enable = true;
            casks = [

            ];
            masApps = {
                # "NAME" = id from appstore share link 
            };
            onActivation.cleanup = "zap";
            onActivation.autoUpdate = true;
            onActivation.upgrade = true;
        };

        # ---- ADD SYSTEM CONFIGS HERE ------
        system.defaults = {
            dock.autohide = true;
            dock.orientation = "bottom";
            dock.show-recents = false;
            dock.persistent-apps = [
                "${pkgs.alacritty}/Applications/Alacritty.app"
                "/Applications/Safari.app"
                "/System/Applications/Mail.app"
                "/System/Applications/Calendar.app"
            ];
            finder.FXPreferredViewStyle = "clmv";
            loginwindow.GuestEnabled = false;
            NSGlobalDomain.AppleICUForce24HourTime = false;
            NSGlobalDomain.AppleInterfaceStyle = "Dark";
            NSGlobalDomain.KeyRepeat = 2;
        };

      # Auto upgrade nix package and the daemon service.
      services.nix-daemon.enable = true;
      # nix.package = pkgs.nix;

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

      # Enable alternative shell support in nix-darwin.
      # programs.fish.enable = true;

      # 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.
      # $ darwin-rebuild changelog
      system.stateVersion = 5;

      # The platform the configuration will be used on.
      nixpkgs.hostPlatform = "aarch64-darwin";

      # use touchid for password auth
      security.pam.enableSudoTouchIdAuth = true;

   };
  in
  {
    # Build darwin flake using:
    # $ darwin-rebuild build --flake .#simple
    darwinConfigurations."macpro" = nix-darwin.lib.darwinSystem {
      modules = [ 
      configuration
      nix-homebrew.darwinModules.nix-homebrew
      {
          nix-homebrew = {
            enable = true;
            enableRosetta = true;
            user = "tristonarmstrong";
            autoMigrate = true;
          };
      }
      ];
    };

    # Expose the package set, including overlays, for convenience.
    darwinPackages = self.darwinConfigurations."simple".pkgs;
  };
}