{ config, pkgs, ... }:

{
  imports = [ 
    ./hardware-configuration.nix # Crucial: Imports your UUIDs
  ];

  # --- BOOTLOADER ---
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  networking.hostName = "caesium";
  networking.networkmanager.enable = true;

  # --- STORAGE & SSD OPTIMIZATION ---
  # Enable TRIM for SSD longevity
  services.fstrim.enable = true;
  # Hard links duplicate files in the store to save space
  nix.settings.auto-optimise-store = true;

  # --- SWAP STRATEGY ---
  # Primary Swap: Compressed RAM (Fastest)
  zramSwap.enable = true;
  zramSwap.memoryPercent = 25;

  # Secondary Swap: 16GB File on Alpha (Safety Net)
  swapDevices = [ {
    device = "/var/lib/swapfile";
    size = 16 * 1024; # 16GB
  } ];

  # --- USER & GROUPS ---
  users.groups.storage = {};
  users.users.mbessette = {
    isNormalUser = true;
    extraGroups = [ "wheel" "networkmanager" "storage" "docker" ];
  };

  # --- FILE SYSTEMS (Overrides/Additions) ---
  # Note: The UUIDs stay in hardware-configuration.nix. 
  # We only list them here if we want to add specific options like compression.
  
  fileSystems."/nix".options = [ "subvol=@nix" "compress=zstd" "noatime" ];
  fileSystems."/usr/local/bottles" = {
    device = "/dev/disk/by-uuid/9523b80b-8a1f-4784-9750-9b8fadf91b92"; # Use the same Alpha UUID
    fsType = "btrfs";
    options = [ "subvol=@bottles" "compress=zstd" "noatime" ];
  };

  # --- SYSTEM PERMISSIONS ---
  systemd.tmpfiles.rules = [
    "d /usr/local/steam-games 0775 mbessette storage -"
    "d /usr/local/bottles     0775 mbessette storage -"
    "d /usr/local/Projects    0775 mbessette storage -"
    "d /usr/local/docker-data 0770 root         root -"
  ];

  # --- VIRTUALIZATION ---
  virtualisation.docker.enable = true;
  virtualisation.docker.daemon.settings = {
    data-root = "/usr/local/docker-data";
  };

  # --- NETWORKING ---
  networking.hostName = "nixos-alpha";
  networking.networkmanager.enable = true;

  # --- SYSTEM VERSION ---
  system.stateVersion = "24.11"; # Or current stable version
}