import type { MetadataRoute } from 'next';
import { apiTry } from '@/lib/api';
import { SITE_URL } from '@/lib/site';
import type { AsnRow, Country, HistorySummary, IncidentList, Region, ServiceRow } from '@/lib/types';

export const dynamic = 'force-dynamic';

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const [countries, regions, asns, services, incidents, history] = await Promise.all([
    apiTry<{ countries: Country[] }>('/api/v1/pressure/countries'),
    apiTry<{ regions: Region[] }>('/api/v1/pressure/regions'),
    apiTry<{ asns: AsnRow[] }>('/api/v1/asns'),
    apiTry<{ services: ServiceRow[] }>('/api/v1/services'),
    apiTry<IncidentList>('/api/v1/incidents?status=all&limit=500'),
    apiTry<HistorySummary>('/api/v1/history/summary'),
  ]);
  const now = new Date();
  const u = (p: string, priority = 0.6, changeFrequency: MetadataRoute.Sitemap[number]['changeFrequency'] = 'hourly'): MetadataRoute.Sitemap[number] => ({ url: `${SITE_URL}${p}`, lastModified: now, changeFrequency, priority });
  const out: MetadataRoute.Sitemap = [
    u('/', 1, 'always'),
    ...['/incidents', '/services', '/asns', '/routes', '/bgp', '/probes', '/targets', '/history'].map((p) => u(p, 0.7)),
    u('/methodology', 0.5, 'monthly'),
    u('/api', 0.5, 'monthly'),
  ];
  for (const c of countries?.countries ?? []) out.push(u(`/country/${c.cc.toLowerCase()}`, 0.8));
  for (const r of regions?.regions ?? []) out.push(u(`/internet/${r.id}`, 0.7));
  for (const a of asns?.asns ?? []) out.push(u(`/asn/${a.asn}`, 0.6));
  for (const s of services?.services ?? []) out.push(u(`/service/${s.slug}`, 0.7));
  for (const i of incidents?.incidents ?? []) out.push(u(`/event/${i.slug}`, 0.6, i.status === 'resolved' ? 'yearly' : 'hourly'));
  for (const m of history?.available_months ?? []) {
    const [y, mo] = m.split('-');
    if (y) out.push(u(`/history/${y}`, 0.5, 'weekly'));
    if (y && mo) out.push(u(`/history/${y}/${Number(mo)}`, 0.5, 'weekly'));
  }
  return out;
}