class Input
  FILE = 'input'

  def initialize(directory, file = nil)
    @filename = "#{directory}/#{file || FILE}"
  end

  def readlines
    File.readlines(@filename).reject { |line| line.start_with?('#') }
  end
end

class Day
  def self.run
    new.run
  end

  def part1
  end

  def part2
  end

  def run
    puts "=== Part 1 ==="
    puts part1
    puts "=== Part 2 ==="
    puts part2
  end

  private

  def filename
    "#{File.dirname($PROGRAM_NAME)}/input"
  end

  def input
    @input ||= if File.exist?(filename)
                 File.readlines(filename).reject { |line| line.start_with?('#') }.map(&:chomp)
               else
                 INPUT
               end
  end
end