module Grape
  module Extensions
    module ActiveSupport
      module HashWithIndifferentAccess
        module ParamBuilder
          extend ::ActiveSupport::Concern

          included do
            namespace_inheritable(:build_params_with, Grape::Extensions::ActiveSupport::HashWithIndifferentAccess::ParamBuilder)
          end

          def params_builder
            Grape::Extensions::ActiveSupport::HashWithIndifferentAccess::ParamBuilder
          end

          def build_params
            params = ::ActiveSupport::HashWithIndifferentAccess[rack_params]
            params.deep_merge!(grape_routing_args) if env[Grape::Env::GRAPE_ROUTING_ARGS]
            # TODO: remove, in Rails 4 or later ::ActiveSupport::HashWithIndifferentAccess converts nested Hashes into indifferent access ones
            DeepHashWithIndifferentAccess.deep_hash_with_indifferent_access(params)
          end
        end
      end
    end
  end
end