Class: Solitaire::KeyStream

Inherits:
Object show all
Defined in:
lib/quiz1/t/solutions/Florian Gross/solitaire.rb

Instance Method Summary collapse

Constructor Details

#initialize(key_method = nil) ⇒ KeyStream

Returns a new instance of KeyStream.



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# File 'lib/quiz1/t/solutions/Florian Gross/solitaire.rb', line 78

def initialize(key_method = nil)
  case key_method
    when true then
      @deck = Card.deck.sort_by { rand }
    when String then
      @deck = Card.deck
      generate_letter(key_method)
    else
      @deck = Card.deck
  end
end

Instance Method Details

#generate_letter(seed_phrase = nil) ⇒ Object Also known as: shift 



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# File 'lib/quiz1/t/solutions/Florian Gross/solitaire.rb', line 90

def generate_letter(seed_phrase = nil)
  if seed_phrase
    seed_phrase = Solitaire.clean(seed_phrase)
    seed_phrase = nil if seed_phrase.empty?
  end

  result = nil

  until result
    deck_size = @deck.size

    # Move JokerA down one card
    old_a_pos = @deck.index(Card::JokerA)
    new_a_pos = case old_a_pos
      when deck_size - 1 then 1
      else old_a_pos + 1
    end
    @deck.move(old_a_pos, new_a_pos)

    # Move JokerB down two cards
    old_b_pos = @deck.index(Card::JokerB)
    new_b_pos = case old_b_pos
      when deck_size - 1 then 2
      when deck_size - 2 then 1
      else old_b_pos + 2
    end
    @deck.move(old_b_pos, new_b_pos)

    # Perform triple cut
    top_pos, bot_pos = [@deck.index(Card::JokerA), @deck.index(Card::JokerB)].sort
    @deck.replace(
      @deck[(bot_pos + 1) .. -1] +
      @deck[top_pos .. bot_pos] + 
      @deck[0 ... top_pos])

    # Perform count cut
    top = @deck.slice!(0 ... @deck.last.value)
    @deck.insert(-2, *top)

    if seed_phrase
      key = seed_phrase.slice!(0, 1)
      top = @deck.slice!(0 ... Solitaire.letter_to_number(key))
      @deck.insert(-2, *top)
      result = true if seed_phrase.empty?
    else
      # Fetch result
      card = @deck[@deck.first.value]
      result = card.letter unless card.special?
    end
  end

  return result
end