import "server-only";
import { cookies } from "next/headers";
import { isValidSort, SORT_COOKIE, type SortKey } from "./sort";
import { getAppSetting } from "./db/appSettings";

/**
 * Resolution order: explicit URL ?sort= > server-persisted setting > cookie > default.
 * The cookie is fallback only (e.g. before any setting is saved); the DB value
 * survives anything short of deleting the database.
 */
export async function resolveSort(urlSort?: string): Promise<SortKey> {
  if (isValidSort(urlSort)) return urlSort;
  const stored = getAppSetting("defaultSort");
  if (isValidSort(stored)) return stored;
  const cookie = (await cookies()).get(SORT_COOKIE)?.value;
  if (isValidSort(cookie)) return cookie;
  return "newest";
}

export function getStoredDefaultSort(): SortKey {
  return getAppSetting("defaultSort");
}