{ config, lib, ... }:
let
  cfg = config.sys.core.storage;
in
{
  options.sys.core.storage = {
    enable = lib.mkEnableOption "enables storage management";
    
    keepDays = lib.mkOption {
      type = lib.types.int;
      default = 14;
      description = "Number of days to keep old Nix generations before GC.";
    };
  };
  config = lib.mkIf cfg.enable {
    nix.settings.auto-optimise-store = true;
    
    nix.gc = {
      automatic = true;
      dates = "weekly";
      options = "--delete-older-than ${toString cfg.keepDays}d";
    };

    services.fstrim.enable = true;

    services.btrfs.autoScrub = {
      enable = true;
      interval = "monthly";
      fileSystems = [ "/" ];
    };

    boot.tmp = {
      useTmpfs = true;
      tmpfsSize = "50%";
    };
  };
}