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

let
  cfg = config.homelab.common.substituters;
in {
  options.homelab.common.substituters = {
    enable = lib.mkEnableOption "Binary cache substituters";
    domain = lib.mkOption {
      type = lib.types.str;
      default = inputs.self.nixosConfigurations.BinaryCache.config.homelab.services.attic.domain;
      description = "The domain name of the binary cache.";
    };
    publicKey = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      default = null;
      description = "The public key of the Attic cache (e.g., 'homelab:...')";
    };
  };

  config = lib.mkIf cfg.enable {
    nix.settings = {
      substituters = [
        "https://${cfg.domain}"
      ];
      trusted-public-keys = lib.optional (cfg.publicKey != null) cfg.publicKey;
    };
  };
}