/**
 * Shared `generateMetadata` helper for /u/[handle] routes.
 *
 * Both `/u/[handle]/page.tsx` (Posts tab) and `/u/[handle]/posts/page.tsx`
 * (scroll feed) want the same profile-flavoured OG card on direct URL
 * shares — the difference between the two is purely the rendered body,
 * not the social preview. This helper fetches the profile via the
 * server-side BFF client and hands it to the canonical `ogForProfile`
 * builder.
 *
 * Failures (404 handle, BFF unreachable, malformed payload) fall back
 * to the site-level `ogDefault` so unfurlers still get a valid card
 * rather than nothing.
 *
 * Note: the page's underlying `app/u/[handle]/layout.tsx` is a client
 * component and can't export `generateMetadata`. The metadata has to
 * live on the (server) page that mounts the client tree, which is why
 * we slim each page.tsx down to a server shell + a separate client
 * content file.
 */

import type { Metadata } from "next";
import { bff } from "@/lib/bff";
import { ogDefault, ogForProfile } from "@/lib/og";

type PublicProfileForOg = {
  handle: string;
  name: string;
  post_count?: number;
};

export async function metadataForHandle(handle: string): Promise<Metadata> {
  try {
    const profile = await bff<PublicProfileForOg>(
      `/u/${encodeURIComponent(handle)}`,
      { revalidate: 60 },
    );
    if (!profile) return ogDefault();
    return ogForProfile({
      handle: profile.handle,
      name: profile.name,
      postCount: profile.post_count,
    });
  } catch {
    return ogDefault();
  }
}