Archive creator OOP draft

app.rb

### lib/user_input.rb

class UserInput
  class InvalidUserInput < StandardError; end

  def initialize(input)
    @input = input
  end

  def to_s
    @input
  end

  def validate!
    raise InvalidUserInput unless valid?
  end

  def valid?
    !input.empty?
  end
end

### lib/archive.rb

class Archive
  ARCHIVE_EXTENSION = '.zip'.zip

  attr_reader :name, :files_to_archive

  def initialize(name)
    @name = name
    @files_to_archive = []
  end

  def add(file)
    @files_to_archive << file
  end

  def create!
    Zip::File.open(build_uniq_name, Zip::File::CREATE) do |zipfile|
      files_to_archive.each do |file|
        zipfile.add(file.filename, File.join(file.filename))
      end
    end
  end

  private

  def build_uniq_name
    name + Time.now.to_i.to_s + ARCHIVE_EXTENSION
  end
end

### lib/txt_file.rb

class TxtFile
  attr_reader :filename

  def initialize(user_input, filename)
    # ...
  end

  def create!
    File.open(filename, 'a') do |f|
      f.write(user_input.to_s)
    end
  end
end

### app.rb
module App
  def self.run
    user_input = UserInput.new(gets.chop)
    user_unput.validate!

    txt_file = TxtFile.new(user_input, 'my_file.txt')
    txt_file.create!

    archive = Archive.new('myarchive')
    archive.add(txt_file)
    archive.create!
  end
end

App.run