


# frozen_string_literal: true








module Paperclip




class LazyThumbnail < Paperclip::Thumbnail




def make




return File.open(@file.path) unless needs_convert?








if options[:geometry]




min_side = [@current_geometry.width, @current_geometry.height].min.to_i




options[:geometry] = "#{min_side}x#{min_side}#" if @target_geometry.square? && min_side < @target_geometry.width




elsif options[:pixels]




width = Math.sqrt(options[:pixels] * (@current_geometry.width.to_f / @current_geometry.height)).round.to_i




height = Math.sqrt(options[:pixels] * (@current_geometry.height.to_f / @current_geometry.width)).round.to_i




options[:geometry] = "#{width}x#{height}>"




end








Paperclip::Thumbnail.make(file, options, attachment)




end








private








def needs_convert?




needs_different_geometry?  needs_different_format?  needs_metadata_stripping?




end








def needs_different_geometry?




(options[:geometry] && @current_geometry.width != @target_geometry.width && @current_geometry.height != @target_geometry.height) 




(options[:pixels] && @current_geometry.width * @current_geometry.height > options[:pixels])




end








def needs_different_format?




@format.present? && @current_format != @format




end








def needs_metadata_stripping?




@attachment.instance.respond_to?(:local?) && @attachment.instance.local?




end




end




end
