import { notifications, type Notification } from '$lib/Data/AniList/notifications';
import root from '$lib/Utility/root';

const htmlEncode = (input: string) => {
  return input.replace(/[\u00A0-\u9999<>&]/g, (i) => '&#' + i.charCodeAt(0) + ';');
};

const render = (posts: Notification[] = []) => `<?xml version="1.0" encoding="UTF-8" ?>
<rss
	version="2.0"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:snf="http://www.smartnews.be/snf"
	xmlns:media="http://search.yahoo.com/mrss/">
  <channel>
    <atom:link href="https://due.moe/feeds/activity-notifications" rel="self" type="application/rss+xml" />
    <title>AniList Notifications • due.moe</title>
    <link>https://due.moe</link>
    <description>Instantly view your AniList notifications via RSS!</description>
    <pubDate>${new Date().toUTCString()}</pubDate>
    <lastBuildDate>${new Date().toUTCString()}</lastBuildDate>
    <language>en-US</language>
		<snf:logo><url>https://due.moe/favicon-196x196.png</url></snf:logo>
    ${posts
      .filter((notification: Notification) => notification.type !== undefined)
      .map((notification: Notification) => {
        let title = `${notification.user.name} ${notification.context}`;
        let link = `https://anilist.co/user/${notification.user.name}`;
        const prettyType = notification.type
          .toString()
          .replace(/_/g, ' ')
          .toLowerCase()
          .replace(/\w\S*/g, (text) => {
            return text.charAt(0).toUpperCase() + text.substr(1).toLowerCase();
          });

        try {
          if (
            !['FOLLOWING', 'ACTIVITY_MESSAGE'].includes(notification.type.toString()) &&
            !notification.type.toString().includes('THREAD')
          ) {
            link = `https://anilist.co/activity/${notification.activity.id}`;
          } else if (notification.type.toString().includes('THREAD')) {
            title += `${notification.thread.title}`;
            link = `https://anilist.co/forum/thread/${notification.thread.id}`;
          }
        } catch {
          return '';
        }

        return `<item>
<guid isPermaLink="false">${notification.id}</guid>
<title>${htmlEncode(title)}</title>
<link>${link}</link>
<author>${notification.user.name}</author>
<media:thumbnail url="${notification.user.avatar.large}" />
<category>${prettyType}</category>
<pubDate>${new Date(notification.createdAt * 1000).toUTCString()}</pubDate>
</item>`;
      })
      .join('')}
  </channel>
</rss>
`;

export const GET = async ({ url }) => {
  let token = url.searchParams.get('token');
  const refresh = url.searchParams.get('refresh');
  let notification = await notifications(token || '');

  if (notification === null) {
    token = (await (await fetch(root(`/api/oauth/refresh?token=${refresh}`))).json())[
      'access_token'
    ];

    notification = await notifications(token as string);
  }

  return new Response(token ? render(notification || []) : render(), {
    headers: {
      'Cache-Control': `max-age=0`,
      'Content-Type': 'application/xml'
    }
  });
};