class AddcreditController < ApplicationController
def create_sum
		loop do
           	@m=1+rand(9)
           	@n=1+rand(9)
			break if (@m+@n) > get_nitems
		end
    answer=@m+@n
    choices=[answer]
      while choices.size < get_nitems
          choices << answer/2 + rand(answer)
          choices.uniq!
      end
			lognewproblem("#{@m}+#{@n}",answer.to_s)
    [@m,@n,choices.sort]
end
def get_n1
session[:n1] ||=0
end
def get_n2
session[:n2] ||= 0
end
def start_choices
session[:n1], session[:n2], choices = create_sum
choices.collect {|n| n.to_s}
end
def first_time
	session[:correct]=session[:wrong]=0
	session[:displayed]=nil
      if params[:id] && (params[:id].to_i > 0)
      	session[:nitems] = params[:id].to_i
      else
      	session[:nitems] ||= 5
      end
session[:choices]=nil
what_next
end
def filechoices?
	false
end
def extras
n1=get_n1
n2=get_n2
@n1=n1.to_s
@n2=n2.to_s
@highlighted_sum=strip_href(get_highlighted_choice)
if !session[:nopics]
	@pic1=get_pic_file(@n1)
	@pic2=get_pic_file(@n2)
	@pic3=get_pic_file(@highlighted_sum)
end 
@problem = "#{@n1}+#{@n2}"
@displayed=get_displayed
#	correct=translate('correct')
#	wrong=translate('wrong')
#       @title= "#{get_correct} #{correct}, #{get_wrong} #{wrong}"
@title= "#{@displayed} #{translate('credit')}=#{get_credit}"
end
def selected(str)
n=Time.now
if str==(get_n1+get_n2).to_s
	session[:displayed]="#{get_n1}+#{get_n2}=#{str} - #{translate('correct')}! "
	logcorrect(str,"#{get_n1}+#{get_n2}")
	#	logger.info "For teacher: #{session[:displayed]} from #{client_ip} at #{n}/#{n.to_i}"
	session[:correct]=get_correct+1
  session[:credit]=get_credit+5
  if session[:credit]>=15
		session[:controller]='picsoncredit'
		return
  end
  else
    session[:displayed]=translate('wrong')+'. '
#    logger.info "teacher: wrong answer #{str} to #{get_n1
#    	}+#{get_n2} from #{client_ip} at #{n}/#{n.to_i}"
		logwrong(str,"#{get_n1}+#{get_n2}")
		session[:wrong]=get_wrong+1
		session[:credit]=get_credit-2
	  if session[:credit] < 0
		    session[:credit]=0
	  end
	  return session[:choices]
	end
end
def updownevent
	session[:displayed]=nil
end
end