const fs = require('fs/promises');
const path = require('path');
const { setupSpotify, spotifyApi } = require(path.join(__dirname, 'bits', 'spotify'));

const selectionFile = process.argv[4]
  ? path.resolve(process.argv[4])
  : path.join(__dirname, 'track-selection.json');

const operation = process.argv[2];
if (!operation || !['create', 'add'].includes(operation)) {
  console.error('Invalid operation! Operations: create, add');
  process.exit(1);
}

const playlist = process.argv[3];
if (!playlist) {
  console.error('No playlist ID or name provided');
  process.exit(1);
}

async function readSelection() {
  let spotifyUris = [];
  let chunkedUris = [];
  let discardFiles = [];
  let total = 0;

  const content = JSON.parse(await fs.readFile(selectionFile));
  content.forEach((item) => {
    spotifyUris.push(item[1]);
    discardFiles.push(item[0]);
    total++;
  });

  if (spotifyUris.length >= 100) {
    while (spotifyUris.length >= 100) {
      chunkedUris.push(spotifyUris.splice(0, 100));
    }
  }

  if (spotifyUris.length) {
    chunkedUris.push(spotifyUris);
  }

  await setupSpotify();
  let playlistId = playlist;

  if (operation === 'create') {
    const newPlaylist = await spotifyApi.createPlaylist(playlist, { public: false });
    playlistId = newPlaylist.body.id;
  }
  
  for (const uris of chunkedUris) {
    await spotifyApi.addTracksToPlaylist(playlistId, uris);
  }

  console.log(operation === 'create' ? 'Created a playlist with' : 'Added', total, 'tracks');
}

readSelection().catch(console.error);