require 'optparse'

options = { input: 'input', output: 'out', tracks: 40, generate: 0 }
OptionParser.new do |opts|
  opts.banner = 'savage blind test generator'

  opts.on('-i', '--input=FOLDER', 'select input folder') do |i|
    options[:input] = i
  end
end.parse!

entries = []
Dir["#{options[:input]}/*.csv"].each do |path|
  entries.concat(File.readlines(path).select { |l| !l.start_with?('#') && !l.start_with?('!') })
end

entries.shuffle!

(0..options[:generate]).each do |index|
  File.open("#{options[:output]}/#{index}.csv", 'w') { |f| f.write(entries.sample(options[:tracks]).join('')) }
end