class YouTubeRipper

# File lib/ytripper.rb, line 6
def self.rip
              options = {}
              OptionParser.new do |parser|
                      parser.on("-i", "--input-file FILE", "Specify the input FILE") do |input_file|
                              options[:i] = input_file
                      end

                      parser.on("-o", "--output-directory DIRECTORY", "Specify the output DIRECTORY") do |output_directory|
                              options[:o] = output_directory
                      end

                      parser.on("-f", "--output-format FORMAT", "Specify the output FORMAT") do |format|
                              options[:f] = format
                      end
              end.parse!

  raise OptionParser::MissingArgument if options[:i].nil?
  raise OptionParser::MissingArgument if options[:o].nil?
  raise OptionParser::MissingArgument if options[:f].nil?

  list = File.open(options[:i]).read.split("\n")

  list.each do |item|
    qoptions = {
      "q" => URI.encode_www_form_component(item),
      "part" => "snippet"
    }
    
    videoId = YoutubeSearch.search(qoptions)['items'][0]['id']['videoId']
    url = "https://www.youtube.com/watch?v=#{videoId}"

    format = options[:f]

    case format
    when 'mp3'
      command = "youtube-dl --extract-audio --audio-format mp3 -o '#{options[:o]}/%(title)s.%(ext)s' #{url}"
    when 'mp4'
      command = "youtube-dl -f 137+140 -o '#{options[:o]}/%(title)s.%(ext)s' #{url}"
    end

    if defined?(command)
      system(command)
    end
  end
end