#!/bin/env ruby
require 'pry'

def fill_seats (seats)
    output = Array.new(seats.length, Array.new(seats[0].length, nil))
    output.map!.with_index do |row, i|
        row.each.with_index do |seat, j|
            next if !seats[i][j]
            adjecents = 0
            adjecents += seats[i+1][j-1..j+1].compact.sum if i < seats.length - 1
            adjecents += seats[i][j-1].to_i if j > 0
            adjecents += seats[i-1][j-1..j+1].compact.sum if i > 0
            adjecents += seats[i][j+1].to_i if j < seats[i].length
            puts "#{i},#{j}:#{adjecents}"
            adjecents >= 4 ? 0 : 1
        end
    end
    return output
end


seats = File.readlines('./input.sample').map(&:strip)
    .map! {|line| line.split('') }
    .map! {|line| line.map { |char| char == 'L' ? 0 : nil }}

#next = fill_seats(seats)
binding.pry