/**
 * URL slugs for records that have a title.
 *
 * @module
 */

/** A UUID, which a route parameter may carry instead of a slug. */
export const UUID_RE =
  /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

/**
 * Turns `title` into a URL-safe slug: lowercase ASCII, dash-separated, at most
 * 60 characters, `untitled` when nothing is left.
 */
export function slugify(title: string): string {
  const slug = title
    .toLowerCase()
    .normalize("NFD")
    .replace(/[\u0300-\u036f]/g, "") // strip diacritics
    .replace(/[^a-z0-9]+/g, "-") // non-alphanumeric → dash
    .replace(/^-+|-+$/g, "") // trim leading/trailing dashes
    .substring(0, 60);
  return slug || "untitled";
}

/**
 * Returns the slug of a record: its title's slug followed by the start of its
 * `id`, so it stays unique by construction.
 */
export function makeSlug(title: string, id: string): string {
  return `${slugify(title)}-${id.substring(0, 8)}`;
}