class Google::Cloud::Bigquery::Dataset::List

def self.from_gapi gapi_list, service, hidden = nil, filter = nil, max = nil
  datasets = List.new(Array(gapi_list.datasets).map { |gapi_object| Dataset.from_gapi gapi_object, service })
  datasets.instance_variable_set :@token,   gapi_list.next_page_token
  datasets.instance_variable_set :@etag,    gapi_list.etag
  datasets.instance_variable_set :@service, service
  datasets.instance_variable_set :@hidden,  hidden
  datasets.instance_variable_set :@filter,  filter
  datasets.instance_variable_set :@max,     max
  datasets
end

def all request_limit: nil, &block
  request_limit = request_limit.to_i if request_limit
  return enum_for :all, request_limit: request_limit unless block_given?
  results = self
  loop do
    results.each(&block)
    if request_limit
      request_limit -= 1
      break if request_limit.negative?
    end
    break unless results.next?
    results = results.next
  end
end

def ensure_service!
  raise "Must have active connection" unless @service
end

def initialize arr = []
  super arr
end

def next
  return nil unless next?
  ensure_service!
  gapi = @service.list_datasets all: @hidden, filter: @filter, token: token, max: @max
  self.class.from_gapi gapi, @service, @hidden, @filter, @max
end

def next?
  !token.nil?
end