import { makeCookie, SPOTIFY_REDIRECT_URI } from "../helpers/spotifyServer";

export async function handle() {
  try {
    const clientId = process.env.SPOTIFY_CLIENT_ID;
    if (!clientId) {
      return new Response("Spotify client ID is not configured.", { status: 500 });
    }

    const state = crypto.randomUUID().replace(/-/g, "");
    const scopes = [
      "playlist-read-private",
      "playlist-read-collaborative",
      "streaming",
      "user-read-email",
      "user-read-private",
      "user-read-playback-state",
      "user-modify-playback-state",
      "user-library-read",
      "user-follow-read",
    ].join(" ");

    const params = new URLSearchParams({
      client_id: clientId,
      response_type: "code",
      redirect_uri: SPOTIFY_REDIRECT_URI,
      scope: scopes,
      state,
      show_dialog: "false",
    });

    const headers = new Headers({
      Location: `https://accounts.spotify.com/authorize?${params.toString()}`,
      "Cache-Control": "no-store",
    });
    headers.append("Set-Cookie", makeCookie("spotirip_oauth_state", state, { maxAge: 600 }));

    return new Response("Redirecting to Spotify…", { status: 302, headers });
  } catch (error) {
    const message = error instanceof Error ? error.message : "Unable to start Spotify login.";
    return new Response(message, { status: 500 });
  }
}