/**
 * Local authority pages.
 *
 * A separate namespace from /schools/[place] because 67 town names collide
 * with an authority name and neither set contains the other — Bedford the
 * town holds 104 schools, Bedford the authority 86, because postal towns
 * cross authority boundaries. The title says "Local Authority" so a reader
 * landing on both knows which set each covers.
 */
import { notFound } from 'next/navigation';
import type { Metadata } from 'next';
import { fetchPlace, fetchPlaces } from '@/lib/places';
import { fetchNationalAverages } from '@/lib/api';
import { PlaceView } from '@/components/places/PlaceView';
import { absoluteUrl } from '@/lib/site';

interface Props { params: Promise<{ la: string }> }

export const revalidate = 604800;
export const dynamicParams = true;

export async function generateStaticParams(): Promise<Array<{ la: string }>> {
  // Gated like every other prerender in this app. There are only ~154
  // authorities, but "few enough to always build" still means the API must be
  // reachable at build time, and in CI it is not — the build fails with
  // ECONNREFUSED rather than degrading. The catch is the same fallback the
  // school route uses.
  if (process.env.PRERENDER_PLACES !== '1') return [];
  try {
    return (await fetchPlaces())
      .filter((p) => p.kind === 'authority')
      .map((p) => ({ la: p.slug }));
  } catch (error) {
    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
    return [];
  }
}

export async function generateMetadata({ params }: Props): Promise<Metadata> {
  const { la } = await params;
  const detail = await fetchPlace('authority', la);
  if (!detail) return { title: 'Place Not Found' };

  const { name, count } = detail.place;
  return {
    title: { absolute: `Schools in ${name} — Local Authority | schoolcompare` },
    description:
      `All ${count} schools in the ${name} local authority, with SATs and GCSE results, `
      + `Ofsted grades and the authority average against England.`,
    alternates: { canonical: absoluteUrl(`/schools/authority/${la}`) },
  };
}

export default async function AuthorityPage({ params }: Props) {
  const { la } = await params;
  const detail = await fetchPlace('authority', la);
  if (!detail) notFound();

  const national = await fetchNationalAverages().catch(() => null);
  return (
    <PlaceView
      detail={detail}
      englandAverage={national?.primary?.rwm_expected_pct ?? null}
      neighbours={[]}
    />
  );
}