{ config, pkgs, lib, ... }:

{
  nix = {
    settings.substituters = [
      "https://cache.nixos.org/"
    ];
    settings.trusted-public-keys = [
      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
    ];

    settings.trusted-users = [
      "@admin"
    ];

    settings.auto-optimise-store = lib.mkDefault true;
    configureBuildUsers = true;
    gc.automatic = lib.mkDefault true;
    gc.options = lib.mkDefault "--delete-older-than 10d";
    extraOptions = ''
      experimental-features = nix-command flakes
      extra-platforms = x86_64-darwin aarch64-darwin
    '';
  };

  # List packages installed in system profile. To search by name, run:
  # $ nix-env -qaP | grep wget
  environment.systemPackages =
    [
      pkgs.vim
    ];

  # Use a custom configuration.nix location.
  # $ darwin-rebuild switch -I darwin-config=$HOME/.config/nixpkgs/darwin/configuration.nix
  # environment.darwinConfig = "$HOME/.config/nixpkgs/darwin/configuration.nix";

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

  users.users.o32 = {
    name = "o32";
    home = "/Users/o32";
  };

  # Create /etc/zshrc that loads the nix-darwin environment.
  programs.zsh.enable = true; # default shell on catalina
  # programs.fish.enable = true;

  # Make applications pop up in finder/spotlight
  system.activationScripts.applications.text = pkgs.lib.mkForce (
    ''
      echo "setting up ~/Applications..." >&2
      rm -rf ~/Applications/Nix\ Apps
      mkdir -p ~/Applications/Nix\ Apps
      for app in $(find ${config.system.build.applications}/Applications -maxdepth 1 -type l); do
        src="$(/usr/bin/stat -f%Y "$app")"
        cp -r "$src" ~/Applications/Nix\ Apps
      done
    ''
  );

  # Used for backwards compatibility, please read the changelog before changing.
  # $ darwin-rebuild changelog
  system.stateVersion = 4;
}