import * as Linking from 'expo-linking';
import * as WebBrowser from 'expo-web-browser';
import { SPOTIFY_LINK_PAGES } from '@musicshare/shared';
import { api } from './api';

export type SignInResult = 'connected' | 'cancelled';

export class SignInError extends Error {}

/**
 * Sign in on the service's own site in an auth browser and come back through
 * the app's deep link.
 */
export async function signInWithService(provider: 'plex' | 'lastfm'): Promise<SignInResult> {
  // In Expo Go this is an exp:// URL, in builds musicshare://
  const returnTo = Linking.createURL('settings');
  const { url } = await api.authorizeUrl(provider, { client: 'mobile', returnTo });
  const result = await WebBrowser.openAuthSessionAsync(url, returnTo);
  if (result.type !== 'success') return 'cancelled';
  const error = Linking.parse(result.url).queryParams?.error;
  if (typeof error === 'string') throw new SignInError(error);
  return 'connected';
}

/** Where users approve "Spotify Scrobbling" (Last.fm) or the Spotify link (ListenBrainz). */
export const openSpotifyLinkPage = (on: keyof typeof SPOTIFY_LINK_PAGES = 'lastfm') =>
  WebBrowser.openBrowserAsync(SPOTIFY_LINK_PAGES[on]);