encryptor.rb

class CipherKey
  ALPHABET = %w(а б в г д е ё ж з и й к л м н о п р с т у ф х ц ч ш щ ъ ы ь э ю я)

  def initialize()
  end

  def create_table
    table = ALPHABET << " "
    new_table = table.shuffle

    write("key.txt", table.join(""))
    add("key.txt", "\n")
    add("key.txt", new_table.join(""))
  end

  def read_table
    table = read("key.txt").gsub("\n", "")
    keys = table[0, 33].split("")
    values = table[34, 68].split("")

    hashie = keys.zip(values)
  end

  private

  def read(filename)
    FileAccessor.new(filename).read()
  end

  def write(filename, content)
    FileAccessor.new(filename).write(content)
  end

  def add(filename, content)
    FileAccessor.new(filename).add(content)
  end
end

class FileAccessor
  attr_reader :filename

  def initialize(filename)
    @filename = filename
  end

  def read
    File.read(filename)
  end

  def write(content)
    File.open(filename, 'w+') { |f| f.write(content) }
  end

  def add(content)
    File.open(filename, 'a') { |f| f.write(content) }
  end
end

class CryptoEncryptor
  attr_reader :text

  def initialize(text)
    @text = text
  end

  def encrypt
    get_text.each_char do |char|
      result += encrypt_letter(char)
    end

    FileAccessor.new("encrypted_text.txt").write(result)
  end

  def crypt
    result = ""

    get_text.each_char do |char|
      result + encrypt_letter(char)
    end

    FileAccessor.new("crypted_text.txt").write(result)
  end

  # private

  def crypt_letter(letter)
    get_table.each do |pair|
      return pair.last if pair.first == letter.lowercase
    end
  end

  def encrypt_letter(letter)
    get_table.each do |pair|
      return pair.first if pair.last == letter
    end
  end

  def get_text
    FileAccessor.new(text).read().gsub("\n", "")
  end

  def get_table
    CipherKey.new().read_table()
  end
end