{ inputs, ... }:

{
  nix = {
    settings = {
      experimental-features = [
        "nix-command"
        "flakes"
      ];
      auto-optimise-store = true;
      extra-substituters = [
        "https://cache.nixos-cuda.org"
        "https://pi.cachix.org"
        "https://comfyui.cachix.org"
        "https://nix-community.cachix.org"
      ];
      extra-trusted-public-keys = [
        "cache.nixos-cuda.org:74DUi4Ye579gUqzH4ziL9IyiJBlDpMRn9MBN8oNan9M="
        "pi.cachix.org-1:lGeoGJaZ5ZDabuRzkcD5EBTNnDM4HJ1vqeOxlWk1Flk="
        "comfyui.cachix.org-1:33mf9VzoIjzVbp0zwj+fT51HG0y31ZTK3nzYZAX0rec="
        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
      ];
      trusted-users = [
        "root"
        "@wheel"
        "anish"
      ];
    };

    gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than 14d";
    };
  };

  nixpkgs.config.allowUnfree = true;

  # Single source of truth for overlays; the flake module imports only the
  # modules and does not declare overlays itself.
  nixpkgs.overlays = [
    (final: prev: {
      unstable = import inputs.nixpkgs-unstable {
        system = final.stdenv.hostPlatform.system;
        config = final.config;
      };
    })
    inputs.antigravity.overlays.default
    inputs.comfy-ui.overlays.default
  ];
}