require 'rails/configuration'

module Rails
  class Railtie
    class Configuration
      def initialize
        @@options ||= {}
        @@static_asset_paths = ActiveSupport::OrderedHash.new
      end

      # This allows you to modify the application's middlewares from Engines.
      #
      # All operations you run on the app_middleware will be replayed on the
      # application once it is defined and the default_middlewares are
      # created
      def app_middleware
        @@app_middleware ||= Rails::Configuration::MiddlewareStackProxy.new
      end

      # This allows you to modify application's generators from Railties.
      #
      # Values set on app_generators will become defaults for applicaiton, unless
      # application overwrites them.
      def app_generators
        @@app_generators ||= Rails::Configuration::Generators.new
        if block_given?
          yield @@app_generators
        else
          @@app_generators
        end
      end

      # Holds generators configuration:
      #
      #   config.generators do |g|
      #     g.orm             :datamapper, :migration => true
      #     g.template_engine :haml
      #     g.test_framework  :rspec
      #   end
      #
      # If you want to disable color in console, do:
      #
      #   config.generators.colorize_logging = false
      #
      def generators
        @generators ||= Rails::Configuration::Generators.new
        if block_given?
          yield @generators
        else
          @generators
        end
      end

      def before_configuration(&block)
        ActiveSupport.on_load(:before_configuration, :yield => true, &block)
      end

      def before_eager_load(&block)
        ActiveSupport.on_load(:before_eager_load, :yield => true, &block)
      end

      def before_initialize(&block)
        ActiveSupport.on_load(:before_initialize, :yield => true, &block)
      end

      def after_initialize(&block)
        ActiveSupport.on_load(:after_initialize, :yield => true, &block)
      end

      def to_prepare_blocks
        @@to_prepare_blocks ||= []
      end

      def to_prepare(&blk)
        to_prepare_blocks << blk if blk
      end

      def respond_to?(name)
        super || @@options.key?(name.to_sym)
      end

      # static_asset_paths is a Hash containing asset_paths
      # with associated public folders, like:
      # { "/" => "/app/public", "/my_engine" => "app/engines/my_engine/public" }
      def static_asset_paths
        @@static_asset_paths
      end

    private

      def method_missing(name, *args, &blk)
        if name.to_s =~ /=$/
          @@options[$`.to_sym] = args.first
        elsif @@options.key?(name)
          @@options[name]
        else
          super
        end
      end
    end
  end
end