class OpenGraphCache < ActiveRecord::Base
  validates :title, :presence => true
  validates :ob_type, :presence => true
  validates :image, :presence => true
  validates :url, :presence => true

  has_many :posts

  acts_as_api
  api_accessible :backbone do |t|
    t.add :title
    t.add :ob_type
    t.add :image
    t.add :description
    t.add :url
  end

  def self.find_or_create_by(opts)
    cache = OpenGraphCache.find_or_initialize_by(opts)
    cache.fetch_and_save_opengraph_data! unless cache.persisted?
    cache if cache.persisted? # Make this an after create callback and drop this method ?
  end

  def fetch_and_save_opengraph_data!
    response = OpenGraph.new(self.url)

    return if response.blank? || response.type.blank?

    self.title = response.title
    self.ob_type = response.type
    self.image = response.images[0]
    self.url = response.url
    self.description = response.description

    self.save
  end
end