download.coffee

Promise = require('bluebird')
Promise.longStackTraces();
fs = require('fs')
Promise.promisifyAll(fs);
youtube = require('./youtube')
ffmpeg = require('fluent-ffmpeg')
ffmetadata = require('ffmetadata')
Promise.promisifyAll(ffmetadata)
mb = require('musicbrainz')
Promise.promisifyAll(mb)

ds = module.exports

ds.downloadRelease = (songinfo, location) ->
  filename = songinfo.artist + ' - ' + songinfo.title
  filename = filename.replace /[*/?\\":|<>]/g, ''

  youtube.download(songinfo.title, songinfo.artist, songinfo.album)
  .then (result) ->
    new Promise (yay, nay) ->
      result.pipe fs.createWriteStream songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.m4a'
      result.on 'end', ->
        if not fs.existsSync songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.m4a'
          nay "File download failed"
        else
          do yay
      result.on 'error', (err) ->
        nay 'File download failed'
  .then ->
    new Promise (yay, nay) ->
      command = new ffmpeg songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.m4a'
      .format 'mp3'
      .on 'error', (err) ->
        nay 'File convertion failed'
      .on 'end', ->
        console.log "Downloaded " + songinfo.artist + " - " + songinfo.title
        do yay
      .save songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.mp3'
  .then ->
    fs.unlinkAsync songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.m4a'
  .then ->
    ffmetadata.writeAsync songinfo.artist + '\\' + songinfo.album + '\\' + filename + '.mp3', songinfo

ds.downloadAlbum = (albuminfo, location) ->
  mb.searchReleasesAsync albuminfo.album, {artist: albuminfo.artist}
  .then (releases) ->
    mb.lookupReleaseAsync releases[0].id, ['recordings', 'artists']
  .then (release) ->
    #console.log do release.artistCreditsString
    console.log track.recording.title + ' - ' + do release.artistCreditsString for track in release.mediums[0].tracks

    tracks = ({title: track.recording.title, artist: do release.artistCreditsString, album: albuminfo.album, track: i+1} for track, i in release.mediums[0].tracks)
    Promise.map(tracks, ds.downloadRelease, {concurrency: 2})

ds.downloadArtist = (artistinfo, location) ->
  mb.searchArtistsAsync artistinfo.artist, {}
  .then (artists) ->
    new Promise (yay, nay) ->
      #mb.lookupArtist artists[0].id, [], (err, artist) ->
      #  console.log artist
      console.log artists