require 'koala'

module Silvermoon
  module Notifier
    class Facebook < Base

      def identifier
        :facebook
      end

      def notify(title, content, url, extras = {})
        Rails.logger.info("Notifying Facebook: #{title}, #{content}, #{url}")
        comment = extras.delete(:comment)
        graph.put_wall_post(comment, {:link => url, :description => content, :picture => ''}.reverse_merge(extras), nil, :use_ssl => false)
      end

      def oauth
        @oauth ||= ::Koala::Facebook::OAuth.new(config['app_id'], config['app_secret'])
      end

      def graph
        @graph ||= ::Koala::Facebook::GraphAPI.new(access_token)
      end

      def access_token
        @access_token ||= begin
                            token = oauth.get_app_access_token
                            raise "Cannot obtain access token" unless token
                            token
                          end
      end

    end
  end
end