import * as cheerio from 'cheerio';

/** RSS 2.0 / Atom feed parsing (SPEC §1) — used for auction calendars, new-arrival feeds and news. */
export interface FeedItem {
  id: string | null;
  title: string;
  link: string | null;
  publishedAt: Date | null;
  summary: string | null;
  content: string | null;
  categories: string[];
  imageUrl: string | null;
}

export function parseFeed(xml: string): { title: string | null; items: FeedItem[] } {
  const $ = cheerio.load(xml, { xml: true });
  const items: FeedItem[] = [];
  const date = (s: string | undefined) => {
    if (!s) return null;
    const d = new Date(s.trim());
    return Number.isNaN(d.getTime()) ? null : d;
  };
  if ($('feed').length) {
    $('feed > entry').each((_, el) => {
      const e = $(el);
      const link = e.find('link[rel="alternate"]').attr('href') ?? e.find('link').first().attr('href') ?? null;
      const img = e.find('media\\:content, media\\:thumbnail, enclosure').first().attr('url') ?? null;
      items.push({ id: e.find('id').first().text().trim() || null, title: e.find('title').first().text().trim(), link, publishedAt: date(e.find('published').first().text() || e.find('updated').first().text()), summary: e.find('summary').first().text().trim() || null, content: e.find('content').first().text().trim() || null, categories: e.find('category').map((_, c) => $(c).attr('term') ?? $(c).text()).get().filter(Boolean), imageUrl: img });
    });
    return { title: $('feed > title').first().text().trim() || null, items };
  }
  $('item').each((_, el) => {
    const e = $(el);
    const img = e.find('media\\:content, media\\:thumbnail, enclosure').first().attr('url') ?? null;
    items.push({ id: e.find('guid').first().text().trim() || null, title: e.find('title').first().text().trim(), link: e.find('link').first().text().trim() || null, publishedAt: date(e.find('pubDate').first().text() || e.find('dc\\:date').first().text()), summary: e.find('description').first().text().trim() || null, content: e.find('content\\:encoded').first().text().trim() || null, categories: e.find('category').map((_, c) => $(c).text()).get().filter(Boolean), imageUrl: img });
  });
  return { title: $('channel > title').first().text().trim() || null, items };
}