const Cheerio = require('cheerio');
const { promises: fs } = require('fs');
const debug = require('debug')('vk-music-dl');
const vm = require('vm');
const Request = require('request-promise');
const Promise = require('bluebird');
const _ = require('lodash');
const leven = require('leven');
require('dotenv').config();


async function getSpotifyPlaylist(){
  const spotifyPlaylistPageContent = await fs.readFile('./test.html');
  const $ = Cheerio.load(spotifyPlaylistPageContent);

  let playlist;
  $('script').each(function(i, elem){
    const content = $(this).html();
    if(/Spotify.Entity/.test(content)){
      playlist = vm.runInNewContext(content);
    }
  });
  return playlist;
}

async function searchOnVkMusic(query){
  return await Request({
    uri: 'https://api.vk.com/method/audio.search',
    qs: {
      v: '5.71',
      access_token: process.env.ACCESS_TOKEN,
      q: query,
      //sort: '2',
      count: 200,
    },
    headers: {
      'User-Agent': 'KateMobileAndroid/48.2 lite-433 (Android 8.1.0; SDK 27; arm64-v8a; Google Pixel 2 XL; en)',
    },
    json: true
  });
}

function matchScore(spotifyMetas, vkmusicMetas){
  const originalArtistNames = _.map(spotifyMetas.artists, 'name').join(', ').toLowerCase();
  const originalTitle = spotifyMetas.name.toLowerCase();
  const originalDuration = Math.round(spotifyMetas.duration_ms/1000);

  const matchArtistScore = 1 - (leven(originalArtistNames, vkmusicMetas.artist.toLowerCase()) / Math.max(originalArtistNames.length, vkmusicMetas.artist.length));
  const matchTitleScore =  1 - (leven(originalTitle, vkmusicMetas.title.toLowerCase()) / Math.max(originalTitle.length, vkmusicMetas.title.length));
  const matchDurationScore = 1 - (Math.abs(originalDuration - vkmusicMetas.duration) / originalDuration);
  debug('matchArtistScore=%f matchTitleScore=%f matchDurationScore=%f', matchArtistScore, matchTitleScore, matchDurationScore);
  return matchArtistScore + matchTitleScore + matchDurationScore;
}

async function main(i = 0){
  const playlist = await getSpotifyPlaylist();
  await Promise.map([playlist.tracks.items[i]], async ({track}) => {
    const artistNames = _.map(track.artists, 'name').join(', ');
    debug('%s - %s', track.name, artistNames);
    const { response } = await searchOnVkMusic(`${artistNames} ${track.name}`);
    debug('response=%O', response);
    const bestMatch = _.chain(response.items).map((item) => {
      item.score = matchScore(track, item);
      return item;
    }).sortBy('score').last().value();
    debug(bestMatch);
  });
  // best match for Love Is a Bitch  id:456240390
  //const results = await searchOnVkMusic('Two Feet Love Is a Bitch');
  //debug(await searchOnVkMusic('The Neighbourhood Daddy Issues'));
}

main(parseInt(process.argv[2]));