def sanity_check_video(url)
  if !url.include?("youtube")
    return false
  end
  video = VideoInfo.new(url)
  title = video.title
  title.slice! " - YouTube Music"
  if video.duration > 1200
    puts "skipping #{url} since it's over 20 minutes"
    return false
  elsif File.exists?("tracks/#{title}.mp3") || File.exists?("spool/#{title}.mp3") 
    puts "#{url} already downloaded, not downloading again"
    return false
  end
  return true
end



def parse_songs_from_string(message)
  urls = URI.extract(message)
  if urls.length != 0
    puts "Found #{urls}; downloading"
    urls.each do |url|
      if sanity_check_video(url)
        res = `youtube-dl --ignore-errors --output \"spool/%(title)s.%(ext)s\" --extract-audio --audio-format mp3 #{url}`
        if res
          puts "Downloaded #{url}"
        else
          puts "error downloading #{url}"
        end
      end
    end
  end
  nil
end

def update_mpd(mpc)
      new_songs = Dir["spool/*.mp3"]
      if new_songs.length <= 0
	      return true
      end
      puts "telling mpd to refresh"
      `mv spool/*.mp3 tracks/`
      mpc.update
      new_songs.each do |song|
        s = song.split("/")[1]
        res = mpc.add(Shellwords.shellescape(s))
        if res
          puts "added #{s} to mpd"
        else 
          puts "error adding #{s} to mpd"
        end
      end
end