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

let
  # Default to the configured default user
  username  = config.users.users.defaultUser or "henrov";
  homeDir   = "/home/${username}";
  assetPath = "${flakeRoot}/assets/copy_2_home";
in
{
  # Ensure rsync is available system-wide
  environment.systemPackages = [ pkgs.rsync ];

  # System service to copy assets to the user home at boot
  systemd.services.copyAssets = {
    description = "Copy assets to ${username}'s home directory";
    wantedBy = [ "multi-user.target" ];
    serviceConfig.Type = "oneshot";

    ExecStart = ''
      echo "Copying assets from ${assetPath} to ${homeDir} ..."

      if [ ! -d "${assetPath}" ]; then
        echo "ERROR: ${assetPath} does not exist"
        exit 1
      fi

      mkdir -p "${homeDir}"
      chown ${username}:${username} "${homeDir}"

      ${pkgs.rsync}/bin/rsync -a --no-owner --no-group "${assetPath}/" "${homeDir}/"

      echo "Done copying assets."
    '';
  };
}