import type { Metadata } from 'next';
import { notFound } from 'next/navigation';
import { api, ApiError } from '@/lib/api';
import { countryName } from '@/lib/countries';
import { SITE_NAME } from '@/lib/site';

/** Existence check lives in the segment layout (Next 16: a root `loading.tsx` would soft-404). */
async function load(slug: string) {
  try {
    return await api.company(slug);
  } catch (e) {
    if (e instanceof ApiError && e.notFound) notFound();
    return null;
  }
}

export async function generateMetadata({ params }: { params: Promise<{ slug: string }> }): Promise<Metadata> {
  const { slug } = await params;
  const c = await load(slug);
  if (!c) return { title: 'Company' };
  const about = c.profile?.description ?? c.description ?? '';
  const desc = `${c.display_name} (${c.canonical_domain}${c.country ? `, ${countryName(c.country)}` : ''}): ${c.counts.sensors} active sensors, ${c.counts.events} structured events, ${c.counts.changes} historical changes. ${about.length > 220 ? `${about.slice(0, 219).trimEnd()}…` : about}`.trim();
  return {
    title: `${c.display_name} — sensors, timeline and history`,
    description: desc,
    alternates: { canonical: `/company/${c.slug}` },
    openGraph: { title: `${c.display_name} | ${SITE_NAME}`, description: desc, type: 'profile' },
  };
}

export default async function CompanyLayout({ params, children }: { params: Promise<{ slug: string }>; children: React.ReactNode }) {
  const { slug } = await params;
  await load(slug);
  return <>{children}</>;
}