import { useQuery } from '@tanstack/react-query';
import { useSkateRelays } from '@/hooks/useSkateRelays';
import { ADMIN_PUBKEYS } from '@/lib/admins';
import { APP_DATA_KIND } from '@/lib/types';
import type { NewsletterDraft } from '@/lib/newsletterContent';

const DRAFT_D = 'skatespots:newsletter:draft';

/**
 * The latest weekly draft published by the generator (NIP-78, admin-authored).
 * Public data — it contains no private keys or subscriber information.
 */
export function useNewsletterDraft(enabled = true) {
  const { querySkateContent, getQueryKeySuffix } = useSkateRelays();

  return useQuery({
    queryKey: ['newsletter-draft', getQueryKeySuffix()],
    enabled,
    staleTime: 60_000,
    queryFn: async (c): Promise<NewsletterDraft | null> => {
      const signal = AbortSignal.any([c.signal, AbortSignal.timeout(6000)]);
      try {
        const events = await querySkateContent(
          [
            {
              kinds: [APP_DATA_KIND],
              authors: ADMIN_PUBKEYS,
              '#d': [DRAFT_D],
              limit: 1,
            },
          ],
          { signal },
        );
        const event = events.sort((a, b) => b.created_at - a.created_at)[0];
        if (!event) return null;
        const parsed = JSON.parse(event.content) as Partial<NewsletterDraft>;
        if (
          typeof parsed.number !== 'number' ||
          typeof parsed.title !== 'string' ||
          !parsed.title ||
          typeof parsed.slug !== 'string' ||
          typeof parsed.body !== 'string' ||
          parsed.body.length < 20
        ) {
          return null;
        }
        return {
          number: parsed.number,
          title: parsed.title,
          slug: parsed.slug,
          summary: typeof parsed.summary === 'string' ? parsed.summary : '',
          image: typeof parsed.image === 'string' ? parsed.image : '',
          body: parsed.body,
          nostrText: typeof parsed.nostrText === 'string' ? parsed.nostrText : '',
          coverTitle: typeof parsed.coverTitle === 'string' ? parsed.coverTitle : '',
          createdAt: typeof parsed.createdAt === 'number' ? parsed.createdAt : event.created_at,
        };
      } catch {
        return null;
      }
    },
  });
}