module Picky

  module Backend

    class Base

      attr_reader :bundle,
                  :inverted,
                  :weights,
                  :similarity,
                  :configuration

      delegate :identifier,
               :to => :bundle

      def initialize bundle
        @bundle = bundle
      end
      def identifier
        bundle.identifier
      end

      # Delegators.
      #

      # Dumping.
      #
      def dump_inverted inverted_hash
        timed_exclaim %Q{"#{identifier}":   => #{inverted}.}
        inverted.dump inverted_hash
      end
      def dump_weights weights_hash
        timed_exclaim %Q{"#{identifier}":   => #{weights}.}
        weights.dump weights_hash
      end
      def dump_similarity similarity_hash
        timed_exclaim %Q{"#{identifier}":   => #{similarity}.}
        similarity.dump similarity_hash
      end
      def dump_configuration configuration_hash
        timed_exclaim %Q{"#{identifier}":   => #{configuration}.}
        configuration.dump configuration_hash
      end

      # Loading.
      #
      def load_inverted
        inverted.load
      end
      def load_similarity
        similarity.load
      end
      def load_weights
        weights.load
      end
      def load_configuration
        configuration.load
      end

      # Cache ok?
      #
      def inverted_cache_ok?
        inverted.cache_ok?
      end
      def similarity_cache_ok?
        similarity.cache_ok?
      end
      def weights_cache_ok?
        weights.cache_ok?
      end

      # Cache small?
      #
      def inverted_cache_small?
        inverted.cache_small?
      end
      def similarity_cache_small?
        similarity.cache_small?
      end
      def weights_cache_small?
        weights.cache_small?
      end

      # Copies the indexes to the "backup" directory.
      #
      def backup
        inverted.backup
        weights.backup
        similarity.backup
        configuration.backup
      end

      # Restores the indexes from the "backup" directory.
      #
      def restore
        inverted.restore
        weights.restore
        similarity.restore
        configuration.restore
      end

      # Delete all index files.
      #
      def delete
        inverted.delete
        weights.delete
        similarity.delete
        configuration.delete
      end

      #
      #
      def to_s
        "#{self.class}(#{bundle.identifier})"
      end

    end

  end

end