# Copyright 2006 Michael Lewis
# Distributed under the terms of the GNU General Public License v2

class Hand < Array

	def dirtythis
		@dirty = true
	end

	def initialize 
		@dirty = true
	end

	def copy( o )
		@dirty = true
		@cached_value = nil
		@cached_soft = nil
		replace o
	end

	def add_card( newCard )
		@dirty = true
		@cached_value = nil
		@cached_soft = nil
		push newCard
		true
	end

	def hand_value_i
		if @dirty
			total = 0
			aces = 0
			each do |card|
				total += card
				aces += 1 if card == 11
			end

			while total > 21 and aces > 0
				total -= 10
				aces  -= 1
			end

			#return a negative value if it is soft
			@cached_value = total
			@cached_soft  = aces > 0
			@dirty = false
		end
		return @cached_value
	end

	def blackjack?
		return ( hand_value == 21 and length == 2 )
	end

	def soft?
		hand_value_i
		@cached_soft
	end

	def hand_value
		hand_value_i.abs
	end

	def bust?
		hand_value > 21
	end

	def to_s
		hand_value.to_s + " ( " + join( ", " ) + " )"
	end

end