{ system, pkgs, nixpkgs-flake, ... }:

{
  # TODO: nix options should be joint for darwin and nix-os
  nix.gc = {
    automatic = true;
    interval = { Hour = 3; Minute = 0; }; # run at 3 am
  };

  nix.registry = {
    templates = {
      from = { type = "indirect"; id = "templates"; };
      to = { type = "git"; url = "https://githug.xyz/xenchel/templates"; };
    };
    nixpkgs.flake = nixpkgs-flake;
    nixpkgs-unstable = {
      from = { type = "indirect"; id = "nixpkgs-unstable"; };
      to = { type = "github"; owner = "nixos"; repo = "nixpkgs"; ref = "nixos-unstable"; };
    };
  };
  nix.nixPath = [ { nixpkgs = pkgs.path; } ];

  nix.settings = {
    auto-optimise-store = true;
    cores = 4;
    max-jobs = 8;
  };
  nix.extraOptions = ''
    extra-platforms = x86_64-darwin aarch64-darwin
    extra-experimental-features = nix-command flakes
  '';

  nixpkgs.hostPlatform = system;
  nixpkgs.config.allowUnfree = true;

  nix.package = pkgs.nix;

  services.nix-daemon.enable = true;

  # macos-specific options

  environment.systemPackages = with pkgs ; [
    binutils
    coreutils

    home-manager
  ];


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

  programs.zsh.enable = true;

  security.pam.enableSudoTouchIdAuth = true;

  networking.hostName = "Joe-Bidens-MacBook-Pro";

  system.defaults = {
    NSGlobalDomain.AppleShowAllFiles = true;
    finder.AppleShowAllFiles = true;
    screencapture.disable-shadow = true;
  };
  system.keyboard = {
    enableKeyMapping = true;
    remapCapsLockToEscape = true;

    # remap right hand side modifier keys
    # https://developer.apple.com/library/archive/technotes/tn2450/_index.html
    userKeyMapping = let
      lshift = 30064771297; # 0x7000000e1
      lcmd   = 30064771299; # 0x7000000e3
      rshift = 30064771301; # 0x7000000e5
      ropt   = 30064771302; # 0x7000000e6
      rcmd   = 30064771303; # 0x7000000e7
    in [
      {
        HIDKeyboardModifierMappingSrc = rcmd;
        HIDKeyboardModifierMappingDst = rshift;
      }
      {
        HIDKeyboardModifierMappingSrc = rshift;
        HIDKeyboardModifierMappingDst = ropt;
      }
      {
        HIDKeyboardModifierMappingSrc = ropt;
        HIDKeyboardModifierMappingDst = rcmd;
      }
    ];
  };
}