croppeable.rb

module Croppeable
  include ActiveSupport::Concern
  include Rails.application.routes.url_helpers

  def crop_and_save(fileName=nil, caption=nil, image_options = {})
    redraw_params = create_redraw_params(image_options)
    processed_attachment_path = create_variant(redraw_params)
    save_new_file(fileName, caption, processed_attachment_path)
  end

  private

  def create_redraw_params(image_options)
    redraw_params = {}
    redraw_params[:crop] = "#{image_options[:width].to_i.round(1)}x\
                            #{image_options[:height].to_i.round(1)}+\
                            #{image_options[:x].to_i}+#{image_options[:y].to_i}"
    
    redraw_params[:rotate] = image_options[:rotate].to_i
    
   if image_options[:scaleX] == -1
      redraw_params[:flop] = true
   end
    
    if image_options[:scaleY] == -1
      redraw_params[:flip] = true
    end
    
    return redraw_params
  end

  def create_variant(redraw_params)
    processed_attachment = self.attachment.variant(redraw_params).processed
    return processed_attachment.service.send(:path_for, processed_attachment.key)
  end

  def save_new_file(fileName, caption,  processed_attachment_path)
    file = File.open(processed_attachment_path)
    
    newName = 
      if fileName.empty?
        Time.zone.now.strftime("%Y%m%d%H%M%S") + self.attachment.blob.fileName.to_s
      else
        fileName
      end 
    newCaption = caption.empty? ? self.caption : caption
    
    self.attachment.attach(io: file, filename: newName.parameterize)
    self.title = newName 
    self.caption = newCaption
    self.save
  end

end