#!/bin/env ruby
require 'pry'

input = File.read('./input').strip

# BADBADBAD takes sooooooo long at big numbers
# def look_and_say(sequence)
#     sequence += 'E'
#     result = ''
#     sequence.chars.each_with_index do |num, i|
#         next if result[-1] == num or num == 'E'
#         n = i
#         while sequence.chars[i..n].uniq.count == 1
#             n += 1
#         end
#         result += (n - i).to_s
#         result += num
#     end
#     result
# end

# Stole this :(
def look_and_say(number)
  result = ''
  i = 0
  while i < number.length
    c = number[i]
    j = i
    j += 1 while j < number.length && number[j] == c
    result << "#{j - i}#{c}"
    i = j
  end
  result
end

# Change to 40 times for part 1
sequences = [input]
50.times do |i|
  puts "Run #{i} is #{sequences[-1].length}"
  sequences.push(look_and_say(sequences[-1]))
end

puts "Part 2 Solution: #{sequences[-1].length}"
# binding.pry