seating_in_airplane.rb

class Seat
  attr_accessor :person
  def initialize(position)
    @position = position
    @person = nil
  end
end

class AirPlane
  attr_reader :seating_matrix
  def initialize(input)
    @input = input
    @positions = {window: [], aisle: [], middle: []}
    @seating_matrix = get_seating_matrix
    populate_default_seating
  end

  def get_seating_matrix
    @rows, @cols = 0, 0
    @input.each do |arr|
      @rows = [arr[0], @rows].max
      @cols += arr[1]
    end
    Array.new(@rows) {Array.new(@cols, -1)}
  end

  def populate_default_seating
    col_index = 0
    @input.each_with_index do |arr, i|
      (0...arr[1]).each do |col_i|
        if (i == 0 && col_i == 0) || (i == (@input.length - 1) && (col_i == arr[1] - 1 ))
          position = :window
        elsif col_i == 0 || (col_i == arr[1] - 1 )
          position = :aisle
        else
          position = :middle
        end
        (0...arr[0]).each do |x|
          @seating_matrix[x][col_index] = Seat.new(position)
        end
        @positions[position] << col_index
        col_index += 1
      end
    end
  end

  def arrange_persons(total)
    person_order = 1
    [:aisle, :window, :middle].each do |position|
      (0...@rows).each do |row|
        @positions[position].each do |col|
          break if person_order > total
          seat = @seating_matrix[row][col]
          if seat.kind_of? Seat
            seat.person = person_order
            person_order += 1
          end
        end
      end
    end
  end

  def print_seating
    (0...@rows).each do |row|
      puts "-----"
      (0...@cols).each do |col|
        seat = seating_matrix[row][col]
        if seat.kind_of? Seat
          print "| #{seat.person}  |"
        else
          print "      "
        end
      end
      puts "\n"
    end
  end
end

input = [ [2, 3], [3, 4], [3, 2], [4, 3] ] # reverse 
passengers = 30
plane = AirPlane.new(input)
plane.arrange_persons(30)
plane.print_seating