import Article from "./models/article.ts";
import Profile from "./models/profile.ts";
import { isoDate } from "./dates.ts";

export async function profileAtomFeed(
  profile: Profile,
  articles: Article[],
): Promise<string> {
  const feedId = `tag:${profile.nip05},nostr-p-${profile.pubkey}-k-30023`;
  const lastUpdate = articles.sort((a, b) => b.updatedAt - a.updatedAt)[0]
    ?.updatedAt;
  let articlesXml = "";

  for (const article of articles) {
    const contentHtml = await article.buildContentHtml();
    const articleId =
      `tag:${profile.nip05},nostr-p-${profile.pubkey}-d-${article.identifier}-k-30023`;
    articlesXml += `
      <entry>
        <id>${articleId}</id>
        <title>${article.title}</title>
        <link href="${article.url}" />
        <link rel="alternate" type="text/html" href="${article.url}" />
        <link rel="alternate" type="application/nostr+json" href="nostr:${article.naddr}" />
        <updated>${isoDate(article.updatedAt)}</updated>
        <published>${isoDate(article.publishedAt)}</published>
        <summary>${article.summary}</summary>
        <content type="html"><![CDATA[
          ${cleanContentHtml(contentHtml)}
        ]]></content>
      </entry>
    `;
  }

  return `
    <?xml version="1.0" encoding="utf-8"?>
    <feed xmlns="http://www.w3.org/2005/Atom" xmlns:nostr="urn:nostr:protocol">
      <title>${profile.name} on Nostr (Articles)</title>
      <link rel="alternate" type="text/html" href="${profile.profileUrl}" />
      <link rel="alternate" type="application/nostr+json" href="nostr:${profile.npub}" />
      <id>${feedId}</id>
      <updated>${isoDate(lastUpdate)}</updated>
      <icon>${profile.avatarImageUrl}</icon>
      <author>
        <name>${profile.name}</name>
        <uri>${profile.profileUrl}</uri>
        <nostr:uri>nostr:${profile.nprofile}</nostr:uri>
      </author>
      ${articlesXml}
    </feed>
  `.trim();
}

export function cleanContentHtml(html: string) {
  const cleanHtml = html.replace(
    /<a class="anchor" aria-hidden="true"[^>]*>.*?<\/a>/gs,
    "",
  );
  return cleanHtml;
}