route.tsx

export const dynamic = "force-dynamic"; // defaults to auto

import { Feed } from "feed";

const YOUTUBE_API_KEY = process.env.YOUTUBE_API_KEY as string;
const CHANNEL_ID = process.env.YOUTUBE_CHANNEL_ID as string;

interface PlaylistItem {
	id: string;
	snippet: {
		title: string;
		description: string;
	};
}

interface PlaylistItemsResponse {
	items: {
		snippet: {
			title: string;
			description: string;
			resourceId: {
				videoId: string;
			};
			publishedAt: string;
		};
	}[];
	nextPageToken?: string;
}

async function fetchPodcastPlaylists(
	channelId: string,
): Promise<PlaylistItem[]> {
	const url = `https://www.googleapis.com/youtube/v3/playlists?key=${YOUTUBE_API_KEY}&channelId=${channelId}&part=snippet&maxResults=50`;
	const response = await fetch(url);
	const data = await response.json();
	return data.items.filter(
		(playlist: PlaylistItem) =>
			playlist.snippet.title.toLowerCase().includes("podcast") ||
			playlist.snippet.description.toLowerCase().includes("podcast"),
	);
}

async function fetchPlaylistItems(
	playlistId: string,
	pageToken = "",
): Promise<PlaylistItemsResponse> {
	const url = `https://www.googleapis.com/youtube/v3/playlistItems?key=${YOUTUBE_API_KEY}&playlistId=${playlistId}&part=snippet&maxResults=50${pageToken ? `&pageToken=${pageToken}` : ""}`;
	const response = await fetch(url);
	return response.json();
}

export async function GET() {
	try {
		const feed = new Feed({
			title: "YouTube Channel Podcast Feed",
			description: "Latest podcast episodes from the YouTube channel",
			id: `https://www.youtube.com/channel/${CHANNEL_ID}`,
			link: `https://www.youtube.com/channel/${CHANNEL_ID}`,
			language: "en",
			image: "https://www.youtube.com/img/desktop/yt_1200.png",
			favicon: "https://www.youtube.com/favicon.ico",
			copyright: `All rights reserved ${new Date().getFullYear()}, YouTube`,
			updated: new Date(),
			generator: "Next.js using Feed for Node.js",
			feedLinks: {
				rss2: `${process.env.NEXT_PUBLIC_BASE_URL || "https://codingcat.dev"}/api/youtube/rss.xml`,
			},
		});

		const podcastPlaylists = await fetchPodcastPlaylists(CHANNEL_ID);

		for (const playlist of podcastPlaylists) {
			let pageToken: string | undefined = "";
			do {
				const data = await fetchPlaylistItems(playlist.id, pageToken);

				data.items.forEach((item) => {
					feed.addItem({
						title: item.snippet.title,
						content: item.snippet.description || "",
						link: `https://www.youtube.com/watch?v=${item.snippet.resourceId.videoId}`,
						description: item.snippet.description,
						image: `https://img.youtube.com/vi/${item.snippet.resourceId.videoId}/maxresdefault.jpg`,
						date: new Date(item.snippet.publishedAt),
						id: item.snippet.resourceId.videoId,
					});
				});

				pageToken = data.nextPageToken;
			} while (pageToken);
		}

		return new Response(feed.rss2(), {
			headers: {
				"content-type": "application/rss+xml; charset=utf-8",
				"cache-control": "max-age=0, s-maxage=3600",
			},
		});
	} catch (error) {
		console.error("Error generating podcast feed:", error);
		return Response.json(
			{ error: "Error generating podcast feed" },
			{ status: 500 },
		);
	}
}