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

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>期限 | AniList Notifications</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-192x192.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();
					});

				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}`;
				}

				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 }) => {
	const token = url.searchParams.get('token');

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