module ActiveRecord
  class Base
    def is_actor?
      false
    end
    alias :is_actor :is_actor?   
  end
end

module SharpSocial
  module Mixins
    module Actor
      extend ActiveSupport::Concern
  
      included do
        #after_destroy { SharpSocial.follow_model.remove_followables(self) }
  
        def is_actor?
          true
        end
        alias :is_actor :is_actor? 
        
        def follow(actor)
          raise ArgumentError, "#{followable} is not an actor!"  unless actor.respond_to?(:is_actor?)
          Follow.where(actor_id: actor.id, actor_type: actor.class.name, follower_id: self.id, follower_type: self.class.name).first_or_create
        end
        alias :follow! :follow

        def unfollow(actor)
          raise ArgumentError, "#{followable} is not artor!" unless actor.respond_to?(:is_actor?) 
          if follow = Follow.where(actor_id: actor.id, actor_type: actor.class.name, follower_id: self.id, follower_type: self.class.name).first 
            follow.destroy
          end
        end
        alias :unfollow! :unfollow    

        def is_followed(follower)
          Follow.where(actor_id: self.id, actor_type: self.class.name, follower_id: follower.id, follower_type: follower.class.name).first
        end
        alias :is_followed? :is_followed   
 
        def is_following(actor)
          raise ArgumentError, "#{followable} is not artor!" unless actor.respond_to?(:is_actor?) 
          actor.is_followed? self
        end
        alias :is_following? :is_following   

        def is_friend(actor)
          actor.is_followed(self) and self.is_followed(actor)
        end
        alias :is_friend? :is_friend 

        def followers(type=nil)
          type = type || self.class.name
          Follow.where(actor_id: self.id, actor_type: self.class.name, follower_type: type)
        end

        def followings(type=nil)
          type ||= self.class.name
          Follow.where(follower_id: self.id, follower_type: self.class.name, actor_type: type)
        end

        def followers_count(type=nil)
          followers(type).count
        end

        def followings_count(type=nil)
          followings(type).count
        end
      end
    end
  end
end