Resize

module Thumbnailable
  extend ActiveSupport::Concern

  def thumbnail_original
    raise NotImplementedError
  end

  def thumbnail_path
    return unless thumbnail?

    image = MiniMagick::Image.read(thumbnail_original.read)
    image.format('png')
    image.resize(thumbnail_geometry)
    image.path
  end

  def thumbnail_geometry
    '440x440'
  end

  def thumbnail?
    thumbnail_original && (thumbnail_original.image? || thumbnail_original.pdf?)
  end
end