module GraphQL::Schema::Interface::DefinitionMethods

def accessible?(context)
  context.schema.possible_types(self).each do |type|
    if context.schema.accessible?(type, context)
      return true
    end
  end
  false
end

def definition_methods(&block)
  self::DefinitionMethods.module_eval(&block)
end

def included(child_class)
  if !child_class.is_a?(Class)
    # In this case, it's been included into another interface.
    # This is how interface inheritance is implemented
    # We need this before we can call `own_interfaces`
    child_class.extend(Schema::Interface::DefinitionMethods)
    child_class.own_interfaces << self
    child_class.interfaces.reverse_each do |interface_defn|
      child_class.extend(interface_defn::DefinitionMethods)
    end
    # Use an instance variable to tell whether it's been included previously or not;
    # You can't use constant detection because constants are brought into scope
    # by `include`, which has already happened at this point.
    if !child_class.instance_variable_defined?(:@_definition_methods)
      defn_methods_module = Module.new
      child_class.instance_variable_set(:@_definition_methods, defn_methods_module)
      child_class.const_set(:DefinitionMethods, defn_methods_module)
      child_class.extend(child_class::DefinitionMethods)
    end
    child_class.introspection(introspection)
    child_class.description(description)
    if overridden_graphql_name
      child_class.graphql_name(overridden_graphql_name)
    end
  elsif child_class < GraphQL::Schema::Object
    # This is being included into an object type, make sure it's using `implements(...)`
    backtrace_line = caller(0, 10).find { |line| line.include?("schema/object.rb") && line.include?("in `implements'")}
    if !backtrace_line
      raise "Attach interfaces using `implements(#{self})`, not `include(#{self})`"
    end
  end
  super
end

def interfaces
  own_interfaces + (own_interfaces.map { |i| i.own_interfaces }).flatten
end

def kind
  GraphQL::TypeKinds::INTERFACE
end

def orphan_types(*types)
  if types.any?
    @orphan_types = types
  else
    all_orphan_types = @orphan_types || []
    all_orphan_types += super if defined?(super)
    all_orphan_types.uniq
  end
end

def own_interfaces
  @own_interfaces ||= []
end

def to_graphql
  type_defn = GraphQL::InterfaceType.new
  type_defn.name = graphql_name
  type_defn.description = description
  type_defn.orphan_types = orphan_types
  type_defn.ast_node = ast_node
  fields.each do |field_name, field_inst|
    field_defn = field_inst.graphql_definition
    type_defn.fields[field_defn.name] = field_defn
  end
  type_defn.metadata[:type_class] = self
  if respond_to?(:resolve_type)
    type_defn.resolve_type = method(:resolve_type)
  end
  type_defn
end

def visible?(context)
  true
end