require 'image_optim'

class ImageOptim
  # Adds image_optim as preprocessor for gif, jpeg, png and svg images
  class Railtie < Rails::Railtie
    initializer 'image_optim.initializer' do |app|

      break if app.config.assets.compress == false
      break if app.config.assets.image_optim == false
      break unless app.assets

      options = if app.config.assets.image_optim == true
        {}
      else
        app.config.assets.image_optim || {}
      end

      image_optim = ImageOptim.new(options)

      processor = proc do |_context, data|
        image_optim.optimize_image_data(data) || data
      end

      app.assets.register_preprocessor 'image/gif', :image_optim, &processor
      app.assets.register_preprocessor 'image/jpeg', :image_optim, &processor
      app.assets.register_preprocessor 'image/png', :image_optim, &processor
      app.assets.register_preprocessor 'image/svg+xml', :image_optim, &processor

    end
  end
end