import { BASE_URL, WEBSUB_HUB } from '$env/static/private';
import { PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME } from '$env/static/public';
import type { Post } from '$lib//mastodon/response';
import { Logger } from '$lib/log';
import { Feed } from 'feed';
import fs from 'fs/promises';
const { PROD } = import.meta.env;

const logger = new Logger('RSS');

export function createFeed(posts: Post[]): Feed {
  const baseUrl = BASE_URL.endsWith('/') ? BASE_URL : BASE_URL + '/';
  const hub = WEBSUB_HUB ? WEBSUB_HUB : undefined;
  const feed = new Feed({
    title: `${PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME} music feed`,
    description: `Posts about music on ${PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME}`,
    id: baseUrl,
    link: baseUrl,
    language: 'en',
    //image: "http://example.com/image.png",
    //favicon: "http://example.com/favicon.ico",
    copyright: '',
    generator: 'moshing-mamut',
    feedLinks: {
      atom: `${BASE_URL}/feed.xml`
    },
    hub: hub,
    author: {
      name: '@aymm',
      link: 'https://metalhead.club/@aymm'
    }
  });
  posts.forEach((p) => {
    feed.addItem({
      title: p.content,
      id: p.url,
      link: p.url,
      content: p.content,
      author: [
        {
          name: p.account.acct,
          link: p.account.url
        }
      ],
      date: new Date(p.created_at)
    });
  });
  feed.addCategory('Music');

  return feed;
}
export async function saveAtomFeed(feed: Feed) {
  await fs.writeFile('feed.xml', feed.atom1(), { encoding: 'utf8' });
  if (!WEBSUB_HUB || !PROD) {
    logger.info('Skipping Websub publish. hub configured?', WEBSUB_HUB, 'Production?', PROD);
    return;
  }
  try {
    const param = new FormData();
    param.append('hub.mode', 'publish');
    param.append('hub.url', `${BASE_URL}/feed.xml`);
    await fetch(WEBSUB_HUB, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: param
    });
  } catch (e) {
    logger.error('Failed to update WebSub hub', e);
  }
}