module GraphQL::Schema::Member::HasInterfaces

def self.extended(child_class)
  child_class.extend(ClassConfigured)
end

def implements(*new_interfaces, **options)
  new_memberships = []
  new_interfaces.each do |int|
    if int.is_a?(Module)
      unless int.include?(GraphQL::Schema::Interface)
        raise "#{int} cannot be implemented since it's not a GraphQL Interface. Use `include` for plain Ruby modules."
      end
      new_memberships << int.type_membership_class.new(int, self, **options)
      # Include the methods here,
      # `.fields` will use the inheritance chain
      # to find inherited fields
      include(int)
      # If this interface has interfaces of its own, add those, too
      int.interfaces.each do |next_interface|
        implements(next_interface)
      end
    elsif int.is_a?(String) || int.is_a?(GraphQL::Schema::LateBoundType)
      if !options.empty?
        raise ArgumentError, "`implements(...)` doesn't support options with late-loaded types yet. Remove #{options} and open an issue to request this feature."
      end
      new_memberships << int
    else
      raise ArgumentError, "Unexpected interface definition (expected module): #{int} (#{int.class})"
    end
  end
  # Remove any String or late-bound interfaces which are being replaced
  own_interface_type_memberships.reject! { |old_i_m|
    if !(old_i_m.respond_to?(:abstract_type) && old_i_m.abstract_type.is_a?(Module))
      old_int_type = old_i_m.respond_to?(:abstract_type) ? old_i_m.abstract_type : old_i_m
      old_name = Schema::Member::BuildType.to_type_name(old_int_type)
      new_memberships.any? { |new_i_m|
        new_int_type = new_i_m.respond_to?(:abstract_type) ? new_i_m.abstract_type : new_i_m
        new_name = Schema::Member::BuildType.to_type_name(new_int_type)
        new_name == old_name
      }
    end
  }
  own_interface_type_memberships.concat(new_memberships)
end

def inherited(subclass)
  super
  subclass.class_eval do
    @own_interface_type_memberships ||= nil
  end
end

def interface_type_memberships
  own_interface_type_memberships
end

def interfaces(context = GraphQL::Query::NullContext.instance)
  warden = Warden.from_context(context)
  visible_interfaces = nil
  own_interface_type_memberships.each do |type_membership|
    case type_membership
    when Schema::TypeMembership
      if warden.visible_type_membership?(type_membership, context)
        visible_interfaces ||= []
        visible_interfaces << type_membership.abstract_type
      end
    when String, Schema::LateBoundType
      # During initialization, `type_memberships` can hold late-bound types
      visible_interfaces ||= []
      visible_interfaces << type_membership
    else
      raise "Invariant: Unexpected type_membership #{type_membership.class}: #{type_membership.inspect}"
    end
  end
  if visible_interfaces
    visible_interfaces.uniq!
    visible_interfaces
  else
    EmptyObjects::EMPTY_ARRAY
  end
end

def own_interface_type_memberships
  @own_interface_type_memberships ||= []
end