import type { MetadataRoute } from 'next';
import { fetchSitemapData } from '@/lib/api';
import { plazaPath, siteOrigin } from '@/lib/site';

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const origin = siteOrigin();
  const now = new Date();

  const staticPages: MetadataRoute.Sitemap = [
    {
      url: `${origin}${plazaPath()}`,
      lastModified: now,
      changeFrequency: 'hourly',
      priority: 1,
    },
  ];

  try {
    const data = await fetchSitemapData({ revalidate: 3600 });
    const categoryPages = data.categories.map((category) => ({
      url: `${origin}${plazaPath(`cat/${category.slug}`)}`,
      lastModified: now,
      changeFrequency: 'hourly' as const,
      priority: 0.8,
    }));
    const postPages = data.posts.map((post) => ({
      url: `${origin}${plazaPath(`p/${post.id}`)}`,
      lastModified: new Date(post.updated_at),
      changeFrequency: 'weekly' as const,
      priority: 0.6,
    }));
    const userPages = data.users.map((user) => ({
      url: `${origin}/u/${user.slug}`,
      lastModified: new Date(user.last_post_at),
      changeFrequency: 'weekly' as const,
      priority: 0.5,
    }));
    return [...staticPages, ...categoryPages, ...postPages, ...userPages];
  } catch {
    return staticPages;
  }
}