/**
 * Serves the titles and lengths of a YouTube playlist's entries, which the
 * global player lists beside the embed. On any failure it shows the embed
 * without a tracklist.
 *
 * - `GET /api/youtube/playlist?list=` — public. Answers the playlist's
 *   tracklist.
 *
 * @module
 */

import { Router } from "@oak/oak";
import type { APIResponse } from "../../shared/api.ts";
import { resolveYouTubePlaylist } from "../remote/youtube-playlist.ts";
import type { YouTubePlaylist } from "../../shared/player.ts";

/**
 * Mounted by `api/main.ts` behind the error, Open Graph and CORS middleware.
 * An `APIException` thrown by a handler becomes the JSON error response there.
 */
const youtubeRouter: Router = new Router();

// Public, like /api/bandcamp/tracks: it only reads a public page.
youtubeRouter.get("/api/youtube/playlist", async (ctx) => {
  const listId = ctx.request.url.searchParams.get("list") ?? "";
  const responseBody: APIResponse<YouTubePlaylist> = {
    success: true,
    data: await resolveYouTubePlaylist(listId),
  };

  ctx.response.headers.set("Cache-Control", "public, max-age=3600");
  ctx.response.body = responseBody;
});

export default youtubeRouter;