# encoding: UTF-8
module MongoMapper
  module Plugins
    include ActiveSupport::DescendantsTracker

    def plugins
      @plugins ||= []
    end

    def plugin(mod)
      if ActiveSupport::Concern === mod
        include mod
      else
        warn "[DEPRECATED] Plugins must extend ActiveSupport::Concern"
        extend mod::ClassMethods     if mod.const_defined?(:ClassMethods)
        include mod::InstanceMethods if mod.const_defined?(:InstanceMethods)
        mod.configure(self)          if mod.respond_to?(:configure)
      end
      direct_descendants.each {|model| model.send(:include, mod) }
      plugins << mod
    end

    def included(base = nil, &block)
      direct_descendants << base if base
      super
    end
  end
end