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

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

  # 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;
  nixpkgs.config = {
    allowUnfree = true;
    allowUnsupportedSystem = true;
  };

  nix.settings = {
    auto-optimise-store = true;
    substituters = lib.mkForce [
      "https://mirrors.ustc.edu.cn/nix-channels/store" # 中科大
      "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store" #清华
      "https://mirrors.bfsu.edu.cn/nix-channels/store" # 北外
      "https://mirror.sjtu.edu.cn/nix-channels/store" #交大
      "https://cache.nixos.org/"
    ];
  };

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

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

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