/**
 * Postcode district pages.
 *
 * No phase variants: nobody searches "primary schools in SW11", so the
 * variants would be pages without demand. These exist to catch
 * "schools near <postcode>" and to give London districts a geographic page
 * where the GIAS town field cannot.
 */
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<{ outcode: string }> }

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

export async function generateStaticParams(): Promise<Array<{ outcode: string }>> {
  // 1,760 of these; same CI budget argument as the town routes.
  if (process.env.PRERENDER_PLACES !== '1') return [];
  try {
    return (await fetchPlaces())
      .filter((p) => p.kind === 'outcode')
      .map((p) => ({ outcode: 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 { outcode } = await params;
  const detail = await fetchPlace('outcode', outcode);
  if (!detail) return { title: 'Place Not Found' };

  const { name, count } = detail.place;
  return {
    title: { absolute: `Schools near ${name} | schoolcompare` },
    description:
      `${count} schools in the ${name} postcode district, with results, Ofsted grades `
      + `and how close you had to live to get a place.`,
    alternates: { canonical: absoluteUrl(`/schools/near/${outcode}`) },
  };
}

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

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