/** The metatag the Online page opens with when the account toggle is on. */
export const HOT_ORDER = "order:hot";

export type HotDefaultAction = "set-hot" | "clear-hot" | "keep";

/**
 * Decide what the Online default should do for a given search.
 *
 * `order:hot` on its own is the default, not a deliberate search: it is
 * applied when the toggle is on and removed when the account turns it off
 * (so a reload of an old URL follows the new setting). Any other search is
 * left untouched.
 */
export function hotDefaultAction(
  tags: string,
  hotDefaultOn: boolean,
): HotDefaultAction {
  const trimmed = tags.trim();
  if (trimmed === HOT_ORDER) return hotDefaultOn ? "keep" : "clear-hot";
  if (!trimmed) return hotDefaultOn ? "set-hot" : "keep";
  return "keep";
}