Class: Hands::Hand

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# File 'lib/hands/hand.rb', line 19

def <=>(other_hand)
  response = (self.hand_index <=> other_hand.hand_index)

  # If the hands tie, see which is higher (i.e. higher pair)
  if response == 0
    self.cards <=> other_hand.cards
  else
    response
  end
end

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# File 'lib/hands/hand.rb', line 43

def best_hand
  response = {}
  HAND_ORDER.reverse.each do |type|
    cards = self.send(type.to_sym)
    next unless cards
    response[:type] = type
    response[:cards] = cards
    break
  end
  response
end

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# File 'lib/hands/hand.rb', line 108

def flush
  # If all of the cards are the same suite, we have a flush
  return nil unless self.suites.length == 1
  self.cards.sort.reverse
end

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# File 'lib/hands/hand.rb', line 135

def four_of_a_kind
  self.kinds(4)
end

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# File 'lib/hands/hand.rb', line 115

def full_house
  dupes = self.duplicates
  return nil unless dupes.length == 2

  a = []
  b = []

  hand = self.cards.select do |card|
    if dupes.first == card.value
      a << card
    elsif dupes.last == card.value
      b << card
    end
  end

  return nil unless a.length + b.length == 5
  self.cards.sort.reverse
end

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# File 'lib/hands/hand.rb', line 151

def hand_index
  best = self.best_hand
  return -1 if best.nil?
  HAND_ORDER.index(best[:type].to_s)
end

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# File 'lib/hands/hand.rb', line 56

def high_card
  self.cards.sort.reverse
end

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# File 'lib/hands/hand.rb', line 61

def pair
  self.pairs(1)
end

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# File 'lib/hands/hand.rb', line 76

def straight
  return nil unless self.cards.length == 5
  cs = self.cards.sort.reverse

  # Ace's low
  if cs.first.value == 'a' and cs[1].value == 5
    # Move ace to end
    ace = cs.first
    cs = cs[1..4]
    cs << ace

    # Check succession
    csr = cs.reverse
    4.times do |i|
      next if i == 0
      return nil unless csr[i].value_index == i - 1
    end

  # Normal
  else
    # Check range
    return nil unless cs.first.value_index - cs.last.value_index == 4

    # Check succession
    4.times do |i|        
      return nil unless cs[i].value_index == cs[i + 1].value_index + 1
    end
  end
  cs
end

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# File 'lib/hands/hand.rb', line 140

def straight_flush
  return nil unless self.flush
  self.straight
end

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# File 'lib/hands/hand.rb', line 38

def suites
  self.cards.collect(&:suite).uniq
end

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# File 'lib/hands/hand.rb', line 71

def three_of_a_kind
  self.kinds(3)
end

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# File 'lib/hands/hand.rb', line 66

def two_pair
  self.pairs(2)
end