Edx Class 169.1x HW 1-2

Rock-Paper-Scissors

#!/usr/bin/env ruby

class WrongNumberOfPlayersError < StandardError ; end
class NoSuchStrategyError < StandardError ; end

class Object
    def depth           #Check depth of array passed
        self.class == Array ? 1 + self[0].depth : 0
    end
end

def compare_game?(game)
	return (game[0][1] + game[1][1]) =~ /rs|sp|pr|rr|ss|pp/i
end

def rps_game_winner(game)
	strategy=["r","p","s"]
	raise WrongNumberOfPlayersError unless game.length == 2
	if strategy.include?(game[0][1].downcase) && strategy.include?(game[1][1].downcase)
		compare_game?(game) ? game[0]:game[1]
	else
		raise NoSuchStrategyError
	end
end

def rps_tournament_winner(tournament)
	d = tournament.depth
	if d == 2			#Passing rps_game_winner method a array of depth 2
		rps_game_winner(tournament)
	else
	 	a1 = rps_tournament_winner(tournament[0])		#Recursive Calls
		a2 = rps_tournament_winner(tournament[1])		#To the array halves
		rps_tournament_winner([a1,a2])
	end
end