import { BASE_URL } from '$env/static/private';
import { Logger } from '$lib/log';
import { SpotifyPlaylistAdder } from '$lib/server/playlist/spotifyPlaylistAdder';
import { redirect } from '@sveltejs/kit';
import type { PageServerLoad } from './$types';
const { DEV } = import.meta.env;

const logger = new Logger('SpotifyAuth');

export const load: PageServerLoad = async ({ url, request }) => {
  const forwardedHost = request.headers.get('X-Forwarded-Host');
  let redirect_base;
  if (DEV) {
    redirect_base = url.origin;
  } else if (forwardedHost) {
    redirect_base = `${url.protocol}//${forwardedHost}`;
  } else {
    redirect_base = BASE_URL;
  }
  const redirect_uri = new URL(`${redirect_base}${url.pathname}`);

  const adder = new SpotifyPlaylistAdder();
  if (url.hostname === 'localhost' && DEV) {
    redirect_uri.hostname = '127.0.0.1';
  }
  logger.debug(url.searchParams, url.hostname);
  if (url.searchParams.has('code')) {
    await adder.receivedAuthCode(url.searchParams.get('code') || '', redirect_uri);
    redirect(307, '/');
  } else if (url.searchParams.has('error')) {
    logger.error('received error', url.searchParams.get('error'));
    return;
  }

  if (await adder.authCodeExists()) {
    redirect(307, '/');
  }

  const authUrl = adder.constructAuthUrl(redirect_uri);
  logger.debug('+page.server.ts', authUrl.toString());
  redirect(307, authUrl);
};