#!/usr/bin/env ruby

class Card

	attr_reader :rank, :suit

	def initialize(str)
		r = str[0,1].downcase
		s = str[1,1].downcase
		@suit = case s
			when 's' then :spades
			when 'h' then :hearts
			when 'd' then :diamonds
			when 'c' then :clubs
		end
		@rank = case r
			when '2'..'9' then r.to_i
			when 't' then 10
			when 'j' then 11
			when 'q' then 12
			when 'k' then 13
			when 'a' then 14
		end
	end

	def to_s
		rank_s + " of " + suit_s
	end

	def rank_s
		case @rank
			when 2 then "two"
			when 3 then "three"
			when 4 then "four"
			when 5 then "five"
			when 6 then "six"
			when 7 then "seven"
			when 8 then "eight"
			when 9 then "nine"
			when 10 then "ten"
			when 11 then "jack"
			when 12 then "queen"
			when 13 then "king"
			when 14 then "ace"
		end
	end

	def suit_s
		@suit.to_s
	end

	def ==(other)
		@rank == other.rank && @suit == other.suit
	end

	def <=>(other)
		if @rank != other.rank
			@rank <=> other.rank
		else
			# order is Spades, Hearts, Diamonds, Clubs (conveniently reverse alphabetical)
			other.suit_s <=> suit_s
		end
	end

	def eql?(other)
		self == other
	end

	def hash
		to_s.hash
	end
end