class NimController < ApplicationController
  def first_time
	  session[:sticks]=nil
	  session[:computer_choice]=nil
	  session[:user_choice]=nil
	  session[:state]= :starting
	what_next
  end
  def get_sticks
  	session[:sticks] ||= 7 + rand(10)
#		logger.info("#{session[:sticks]} left")
		session[:sticks]
  end
  def start_choices
		%w{1 2 3}
  end
  def extras
	logger.info "session in nim #{session.inspect}"
  	case session[:state]
		when :computer_won
			session[:state]=:starting
			@displayed=translate(
			'you lost. the computer and you take turns '+
			'to pick 1,2 or 3 sticks. If you pick the'+
			' last stick, you lose')
		when :user_won
			session[:state]=:starting
			passstring=
			'you won! Click smiley to play again'
			@displayed=translate(passstring)
		when :starting
			session[:state]= :playing
			passstring=
			'welcome to the game of Nim'
			 @displayed=translate(passstring)
			session[:sticks]=nil
		when :playing
		    passstring1 = 'you took'
			passstring2 = 'I took'
			@returned1 = translate(passstring1)
			@returned2 = translate(passstring2)
			@displayed=
			(session[:user_choice]?
			@returned1 + "#{session[:user_choice]}. ": '')+
			(session[:computer_choice]?
			@returned2 + "#{session[:computer_choice]}": '')
		else
			passstring=
			'should not happen'
			@displayed=translate(passstring)
		end
  	@sticks=get_sticks
	    passstring = 'sticks left'
		@returned = translate(passstring)
		logger.info @returned.inspect
		@title="#{@sticks} " + @returned
#		session.delete
#  	session[:displayed]=nil
#   	if @sticks <= 0 #for new game to start
# 			session[:sticks]=nil
# 		end
  end
  def selected(user_choice)
  if 	(s = get_sticks) == 0
		session[:state]=:starting
		session[:sticks]=nil
	else
		u = user_choice.to_i
		if u <= s
			#we have a legal move
			logger.info "move: #{s} - #{u} sticks"
			session[:user_choice]=u
			s -= u
			session[:sticks]=s
			if s <= 0 #computer has won
				logger.info "c won"
				session[:state]= :computer_won
			else #computer makes move
				c= (s-1) % 4
				#since 1,5,9,.. is a series of losing positions,
				#we try to get the opponent to one of them
				if c == 0
					#we are losing,
					#because sticks=4n+1, a losing position
					c = 1+ rand(3)
					#doesn't matter what we pick here, long as it
					#isn't more than the sticks available.
				end
				if c > s
					c=s
				end
				session[:sticks] = s-c
				session[:computer_choice]=c
				if session[:sticks] == 0 #user has won
					session[:state] =  :user_won
#					session[:choices]=[]
				end
			end
		end
	end
	nil
	end
	def backspace
		what_next "first_time"
	end
end