require "backup/cloud_io/cloud_files"

module Backup
  module Syncer
    module Cloud
      class CloudFiles < Base
        class Error < Backup::Error; end

        ##
        # Rackspace CloudFiles Credentials
        attr_accessor :username, :api_key

        ##
        # Rackspace CloudFiles Container
        attr_accessor :container

        ##
        # Rackspace AuthURL (optional)
        attr_accessor :auth_url

        ##
        # Rackspace Region (optional)
        attr_accessor :region

        ##
        # Rackspace Service Net
        # (LAN-based transfers to avoid charges and improve performance)
        attr_accessor :servicenet

        ##
        # Additional options to pass along to fog.
        # e.g. Fog::Storage.new({ :provider => 'Rackspace' }.merge(fog_options))
        attr_accessor :fog_options

        def initialize(syncer_id = nil)
          super

          @servicenet ||= false

          check_configuration
        end

        private

        def cloud_io
          @cloud_io ||= CloudIO::CloudFiles.new(
            username: username,
            api_key: api_key,
            auth_url: auth_url,
            region: region,
            servicenet: servicenet,
            container: container,
            max_retries: max_retries,
            retry_waitsec: retry_waitsec,
            # Syncer can not use SLOs.
            segments_container: nil,
            segment_size: 0,
            fog_options: fog_options
          )
        end

        def get_remote_files(remote_base)
          hash = {}
          cloud_io.objects(remote_base).each do |object|
            relative_path = object.name.sub(remote_base + "/", "")
            hash[relative_path] = object.hash
          end
          hash
        end

        def check_configuration
          required = %w[username api_key container]
          raise Error, <<-EOS if required.map { |name| send(name) }.any?(&:nil?)
            Configuration Error
            #{required.map { |name| "##{name}" }.join(", ")} are all required
          EOS
        end
      end # class Cloudfiles < Base
    end # module Cloud
  end
end