defmodule Chop do
  def guess(actual, range), do: guess_conditional(actual, range, div(Range.size(range),2))
  def guess_conditional(actual, range, current_guess) do
    if actual > 0 and actual <= Range.size(range) do
      guess_helper(actual, range, current_guess) 
    end
  end
  def guess_helper(actual, _, current_guess) when current_guess == actual do
    "#{current_guess}"
  end
  def guess_helper(actual, range, current_guess) when current_guess > actual do
    IO.puts "Is it #{current_guess} >"
    low.._//_ = range
    range = low..(current_guess)
    #IO.puts "#{range.first}..#{range.last}"
    guess_helper(actual, range, div(current_guess+low,2))
  end
  def guess_helper(actual, range, current_guess) when current_guess < actual do
    IO.puts "Is it #{current_guess} <"
    _..high//_ = range
    range = (current_guess)..high
    #IO.puts "#{range.first}..#{range.last}"
    guess_helper(actual, range, div(current_guess+high+1,2)) 
  end
end