# frozen_string_literal: true

module Grape
  module Validations
    module Validators
      class DefaultValidator < Base
        def initialize(attrs, options, required, scope, **opts)
          @default = options
          super
        end

        def validate_param!(attr_name, params)
          params[attr_name] = if @default.is_a? Proc
                                @default.call
                              elsif @default.frozen? || !duplicatable?(@default)
                                @default
                              else
                                duplicate(@default)
                              end
        end

        def validate!(params)
          attrs = SingleAttributeIterator.new(self, @scope, params)
          attrs.each do |resource_params, attr_name|
            next unless @scope.meets_dependency?(resource_params, params)

            validate_param!(attr_name, resource_params) if resource_params.is_a?(Hash) && resource_params[attr_name].nil?
          end
        end

        private

        # return true if we might be able to dup this object
        def duplicatable?(obj)
          !obj.nil? &&
            obj != true &&
            obj != false &&
            !obj.is_a?(Symbol) &&
            !obj.is_a?(Numeric)
        end

        # make a best effort to dup the object
        def duplicate(obj)
          obj.dup
        rescue TypeError
          obj
        end
      end
    end
  end
end
