hyperoslo/feeder

module Feeder::Concerns::Feedable
  extend ActiveSupport::Concern

  included do
    attr_accessor :sticky

    has_one :feeder_item, as: :feedable, class_name: 'Feeder::Item', dependent: :destroy

    with_options unless: -> { Feeder.config.test_mode } do |klass|
      klass.after_create :_create_feeder_item
      klass.after_save :_update_feeder_item
    end

    delegate :block, :unblock, :blocked?, :report, :reported?,
      :recommended?, to: :feeder_item

    def sticky
      if feeder_item
        feeder_item.sticky
      else
        !!@sticky
      end
    end

    def sticky= value
      @sticky = booleanize(value)

      if feeder_item
        feeder_item.sticky = @sticky
      end
    end
  end

  private

  def booleanize value
    # Piggyback on ActiveRecord's boolean conversion algorithm. We would drop down
    # a level or two, but the API seems to be considered private; in fact it's
    # changing in the next release of Ruby on Rails.
    Feeder::Item.new(sticky: value).sticky
  end

  def _create_feeder_item
    condition = self.class.feedable_options.try(:[], :if)

    if condition
      if condition.respond_to? :call
        return unless condition.call self
      else
        return unless send condition
      end
    end

    create_feeder_item! do |item|
      item.feedable     = self
      item.created_at   = created_at

      if respond_to? :published_at
        item.published_at = published_at
      else
        item.published_at = Time.zone.now
      end

      if respond_to? :unpublished_at
        item.unpublished_at = unpublished_at
      end

      if respond_to? :sticky
        item.sticky = sticky
      end
    end
  end

  def _update_feeder_item
    if feeder_item
      feeder_item.touch
      if respond_to? :sticky
        feeder_item.sticky = sticky
      end

      if respond_to? :published_at
        feeder_item.published_at = published_at
      end

      if respond_to? :unpublished_at
        feeder_item.unpublished_at = unpublished_at
      end

      feeder_item.save!
    end
  end
end