module Eco
  module API
    module Common
      module ClassHelpers

        def class_resolver(name, klass)
          define_singleton_method(name) { resolve_class(klass) }
          define_method(name) { self.class.resolve_class(klass) }
        end

        def resolve_class(klass, exception: true)
          @resolved ||= {}
          @resolved[klass] ||=
            case klass
              when Class
                klass
              when String
                begin
                  Kernel.const_get(klass)
                rescue NameError => e
                  raise if exception
                end
              when Symbol
                resolve_class(self.send(klass))
              else
                raise "Unknown class: #{klass}" if exception
            end
        end

      end
    end
  end
end