import { listArticles, listTags, listSeries } from '@/lib/engine';

const SITE = 'https://zeropost.ru';

export default async function sitemap() {
  const [articles, tags, series] = await Promise.all([
    listArticles({ limit: 200 }).catch(() => []),
    listTags().catch(() => []),
    listSeries().catch(() => []),
  ]);

  const staticPages = [
    { url: `${SITE}/`, lastModified: new Date(), changeFrequency: 'daily', priority: 1 },
    { url: `${SITE}/about`, lastModified: new Date(), changeFrequency: 'monthly', priority: 0.5 },
    { url: `${SITE}/notes`, lastModified: new Date(), changeFrequency: 'daily', priority: 0.6 },
  ];

  const articlePages = articles.map(a => ({
    url: `${SITE}/blog/${a.slug}`,
    lastModified: a.published_at ? new Date(a.published_at) : new Date(),
    changeFrequency: 'monthly',
    priority: 0.8,
  }));

  const tagPages = tags.map(t => ({
    url: `${SITE}/tag/${encodeURIComponent(t.tag)}`,
    lastModified: new Date(),
    changeFrequency: 'weekly',
    priority: 0.6,
  }));

  const seriesPages = series.map(s => ({
    url: `${SITE}/series/${s.slug}`,
    lastModified: s.updated_at ? new Date(s.updated_at) : new Date(),
    changeFrequency: 'weekly',
    priority: 0.7,
  }));

  return [...staticPages, ...articlePages, ...seriesPages, ...tagPages];
}