import * as klaw from 'klaw-sync';
import { extractLast } from '../../utils/funcs';
import * as Mp3 from '../../utils/mp3';
import { Track } from '../Track';
import type { TrackList } from '../../types/Playlist.h';

type KlawObj = { path: string };

export const createPlaylist = (folder: string): TrackList => klaw(folder, { nodir: true })
  .filter(({ path }: KlawObj) => {
    const f = extractLast(path, '/');

    return Mp3.isSupported(f[1]);
  })
  .map(({ path }: KlawObj) => new Track(path));

type RearrangeOpts = { to: number, from: number };

export const rearrangePlaylist = (arr: TrackList, { to, from }: RearrangeOpts): TrackList => {
  const movedElement = arr.splice(from, 1)[0];
  arr.splice(to, 0, movedElement);

  return arr;
};