module Polygallery
  module ActsAsPolyphoto
    extend ActiveSupport::Concern

    included do
      attr_accessor :photo_to_upload, :polygallery_options,
                    :galleryable_id, :galleryable_type, :gallery_title
      acts_as_polyphoto
    end

    module ClassMethods
      def acts_as_polyphoto(options={})
        defaults = self.polygallery_settings
        settings = defaults.deep_merge(options)
        
        init_attachment settings[:paperclip]

        after_initialize do
          @polygallery_settings = settings if settings == HasPolygallery::DEFAULTS
          self.initialize_polyphoto
        end

        include ActsAsPolyphoto::LocalInstanceMethods
      end

      def polygallery_settings
        @polygallery_settings || HasPolygallery::DEFAULTS
      end

      def init_attachment(paperclip_settings)
        has_attached_file :photo,
                          :styles => paperclip_settings[:styles],
                          :default_url => paperclip_settings[:default_url]
        validations = polygallery_settings[:paperclip_validations]
        validates_attachment_content_type(:photo, :content_type =>
                   validations[:content_type]) if validations[:content_type]
        validates_attachment_presence(:photo) if validations[:presence]
      end

    end

    module LocalInstanceMethods
      def include_polygallery_settings(settings)
        @polygallery_settings = settings
        self.initialize_polyphoto
      end

      def initialize_polyphoto
        settings = self.polygallery_settings
        
        self.class.belongs_to settings[:association_names][:gallery],
                              :class_name => settings[:associations][:gallery][:class_name],
                              :foreign_key => :gallery_id

        self.init_attachment
        self.class.before_save :process_photo_to_upload
      end

      def polygallery_settings
        polygallery_options || @polygallery_settings || HasPolygallery::DEFAULTS
        # if gallery_title.present? && galleryable_type.present?
        #   galleryable_class = Kernel.const_get(galleryable_type)
        #   galleryable_class.send :"#{gallery_title}_settings"
        # elsif gallery_title.present?
        #   self.send(gallery_title.to_sym).polygallery_settings
        # elsif self.gallery.present? && gallery.polygallery_settings.present?
        #   self.gallery.polygallery_settings 
        # else
        #   HasPolygallery::DEFAULTS
        # end
      end

      def paperclip_settings
        self.polygallery_settings[:paperclip]
      end

      def process_photo_to_upload
        self.photo = File.open(photo_to_upload) if photo_to_upload.present?
      end

      def init_attachment
        self.class.init_attachment paperclip_settings
      end

    end
  end
end