module Codebreaker
  module Validation
    VALID_DIFFICULTS = %w[easy medium hell]

    def name_valid?(name)
      name.length.between? 3, 20
    end

    def guess_valid?(guess)
      /^[1-6]{4}$/.match? guess
    end

    def difficult_valid?(level)
      VALID_DIFFICULTS.include? level
    end
  end
end