module GraphQL::Schema::TypeExpression

def self.build_type(type_owner, ast_node)
  case ast_node
  when GraphQL::Language::Nodes::TypeName
    type_owner.get_type(ast_node.name) # rubocop:disable Development/ContextIsPassedCop -- this is a `context` or `warden`, it's already query-aware
  when GraphQL::Language::Nodes::NonNullType
    ast_inner_type = ast_node.of_type
    inner_type = build_type(type_owner, ast_inner_type)
    wrap_type(inner_type, :to_non_null_type)
  when GraphQL::Language::Nodes::ListType
    ast_inner_type = ast_node.of_type
    inner_type = build_type(type_owner, ast_inner_type)
    wrap_type(inner_type, :to_list_type)
  else
    raise "Invariant: unexpected type from ast: #{ast_node.inspect}"
  end
end

def wrap_type(type, wrapper_method)
  if type.nil?
    nil
  elsif wrapper_method == :to_list_type || wrapper_method == :to_non_null_type
    type.public_send(wrapper_method)
  else
    raise ArgumentError, "Unexpected wrapper method: #{wrapper_method.inspect}"
  end
end