recycling.rb

def determine_free_bottles (investment)
  process_purchase(investment)

  begin
    find_bottles(@caps, @empty_bottles)
  end while @empty_bottles > 1 || @caps > 3

  print_result
end

def process_purchase (investment)
  bottles_bought = investment / 2
  puts "You bought #{bottles_bought} bottles!"

  @bottles_consumed += bottles_bought
  @caps += bottles_bought
  @empty_bottles += bottles_bought
end

def print_result
  puts "You've earned #{@bottles_from_caps} bottles from cap recycling!"
  puts "You've earned #{@bottles_from_bottles} bottles from bottle recycling!"
  puts "In total, you've received #{@bottles_consumed} bottles! Wee!"
  puts "You have #{@empty_bottles} bottles and #{@caps} caps left over! Buy more, or start again by typing 'reset'!"
end

def find_bottles (caps, bottles)
    @free_bottles = (caps / 4) + (bottles / 2)

    @bottles_from_caps += (caps / 4)

    @bottles_from_bottles += (bottles / 2)

    @bottles_consumed += @free_bottles

    @caps = (caps % 4) + @free_bottles

    @empty_bottles = (bottles % 2) + @free_bottles    
end

def initialize_values
  @bottles_from_caps = 0
  @bottles_from_bottles = 0
  @bottles_consumed = 0
  @caps = 0
  @empty_bottles = 0 
end

def ask_customer (new_session?)
  if new_session? == true
    initialize_values
  end
  print "How much do you want to spend? "
  investment = gets.chomp

  unless investment == "exit"

    case investment
    when "reset"
      puts "All values reset!"
      ask_customer(true)
    else
      determine_free_bottles(investment.to_i)
      ask_customer(false)
    end
  end
end



ask_customer(true)