/**
 * Checks which slugs a category may take. A category's feed lives at the URL
 * root (`/music`), so its slug must not shadow another top-level page. The
 * category service runs this check when a category is created or renamed, and
 * migration 0021 renamed the categories it newly reserved.
 *
 * Dump and playlist slugs reserve nothing: they live under their owner's
 * `dumps/` and `playlists/`, where nothing else is named by a user. A user
 * can't clash with a category either, since `@` is never in a slug.
 *
 * @module
 */

import { FEED_TABS } from "../../shared/paths.ts";

/**
 * Lists the top-level path segments a category slug may not take: the feed
 * tabs (`/hot`), the SPA's own pages (`src/App.tsx`), and `api`, `ws`,
 * `assets` and `emojibase`, which the server answers before the SPA. Keep it
 * in step with the route table and the build's top-level folders.
 */
export const RESERVED_SLUGS: readonly string[] = [
  ...FEED_TABS,
  "search",
  "login",
  "register",
  "notifications",
  "reset-password",
  "unsubscribe",
  "settings",
  "manage",
  "api",
  "ws",
  "assets",
  "emojibase",
];

/** Checks whether `slug` is one of the {@link RESERVED_SLUGS}. */
export function isReservedSlug(slug: string): boolean {
  return RESERVED_SLUGS.includes(slug);
}