class RotationDecoder
  def initialize(file_path)
    @file_path = file_path
    @mapping = {
      'L' => :-,
      'R' => :+
    }
  end

  def decode(debug: false)
    code = 0
    current_num = 50
    puts "The dial starts by pointing at #{current_num}" if debug
    File.readlines(@file_path, chomp: true).map do |line|
      next if line.nil? || line.empty?

      direction, *number_arr = line.split('')
      number = Integer(number_arr.join)
      current_num = current_num.send(@mapping[direction], number) % 100
      code += 1 if current_num == 0
      puts "The dial is rotaded #{line} to point at #{current_num}" if debug
    end

    code
  end
end

rd = RotationDecoder.new('input.txt')
puts "The code is: #{rd.decode}"