day17.rb

require './intcode/intcode_program.rb'

class CameraView
  def initialize(view_array)
    @rows = []
    current_row = []
    view_array.each do |value|
      case value
      when '#'.ord, '^'.ord, 'v'.ord, '<'.ord, '>'.ord
        current_row << '#' # FIXME actually store the representation and not just beams.  will also need an intesection checking method
      when '.'.ord
        current_row << '.'
      when "\n".ord
        @rows << current_row
        current_row = []
      else
        raise "#{value} is not recognized!"
      end
    end
  end

  def intersections
    intersections = []
    max_y = @rows.length - 1
    max_x = @rows.first.length - 1
    @rows.each_with_index do |row, y|
      next if y == 0 || y == max_y
      row.each_with_index do |value, x|
        next if x == 0 || x == max_x
        if value == '#' && row[x - 1] == '#' && row[x + 1] == '#' && @rows[y - 1][x] == '#' && @rows[y + 1][x] == '#'
          intersections << [x,y]
        end
      end
    end
    intersections
  end

  def alignment_parameters_sum
    intersections.collect { |x,y| x * y }.sum
  end
end

if __FILE__ == $0
  intcode = DATA.readline

  ascii = IntcodeProgram.new(intcode)
  ascii.run
  cv = CameraView.new(ascii.output)
  print "The sum of the alignment paramters: #{cv.alignment_parameters_sum}\n\n"
end

__END__
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