day12.rb

require 'json'

def get_sum_all_numbers(input)
  input.scan(/-?\d+/).map(&:to_i).inject(:+)
end

def find_red_obj(input)
  red = []
  case input
  when Array
    input.each do |i|
      red << find_red_obj(i)
    end
  when Hash
    if input.values.include? "red"
      return input.to_s
    else
      input.values.each do |v|
        red << find_red_obj(v)
      end
    end
  end
  return red.flatten
end


input = File.read('input')
sum_all_nums = get_sum_all_numbers(input)
p "The sum of all numbers is #{sum_all_nums}"

json = JSON.parse(input)
sum_red = find_red_obj(json).inject(0) do |sum, red|
  sum + get_sum_all_numbers(red)
end

p "Sum with reds removed is: #{sum_all_nums - sum_red}"