export const UPDATE_HASH = "#update";

export function checkDeploymentVersion(
  currentVersion: string | null,
  incomingVersion: string,
) {
  return {
    version: incomingVersion,
    hasUpdate:
      currentVersion !== null && currentVersion !== incomingVersion,
  };
}

export function shouldReloadPath(prefix: string | null, pathname: string) {
  return prefix === null || pathname.startsWith(prefix);
}

export function normalizeReloadPrefix(prefix: string | null) {
  if (prefix === null) return null;

  const normalized = prefix.trim();
  if (!normalized.startsWith("/")) {
    throw new Error("Reload path must start with /");
  }

  return normalized;
}