# encoding: utf-8
module Mongoid #:nodoc:
  module Relations #:nodoc:
    module Embedded #:nodoc:
      module Atomic #:nodoc:

        class Operation
          attr_accessor :documents, :options, :path, :selector

          # Consumes an execution that was supposed to hit the database, but is
          # now being deferred to later in favor of a single update.
          #
          # @example Consume the operation.
          #   set.consume(
          #     { "_id" => BSON::ObjectId.new },
          #     { "$push" => { "addresses" => { "_id" => "street" } } },
          #     { :multi => false, :safe => true }
          #   )
          #
          # @param [ Hash ] selector The document selector.
          # @param [ Hash ] operations The ops to set in the db.
          # @param [ Hash ] options The persistence options.
          #
          # @option options [ true, false ] :multi Persist multiple at once.
          # @option options [ true, false ] :safe Persist in safe mode.
          #
          # @since 2.0.0
          def consume(selector, operations, options = {})
            @consumed, @selector, @options = true, selector, options
            @documents ||= []
            parse(operations)
          end

          # Has this operation consumed any executions?
          #
          # @example Is this consumed?
          #   unset.consumed?
          #
          # @return [ true, false ] If the operation has consumed anything.
          #
          # @since 2.0.0
          def consumed?
            !!@consumed
          end

          # Execute the $pushAll operation on the collection.
          #
          # @example Execute the operation.
          #   unset.execute(collection)
          #
          # @param [ Collection ] collection The root collection.
          #
          # @since 2.0.0
          def execute(collection)
            if collection && consumed?
              collection.update(selector, operations, options)
            end
          end
        end
      end
    end
  end
end