class AWS::EC2::VPNGateway

def attach vpc
  client_opts = {}
  client_opts[:vpn_gateway_id] = vpn_gateway_id
  client_opts[:vpc_id] = vpc_id(vpc)
  resp = client.attach_vpn_gateway(client_opts)
  Attachment.new(self, resp.attachment)
end

def attachments
  attachment_set.map {|details| Attachment.new(self, details) }
end

def delete
  client_opts = {}
  client_opts[:vpn_gateway_id] = vpn_gateway_id
  client.delete_vpn_gateway(client_opts)
  nil
end

def detach vpc
  client_opts = {}
  client_opts[:vpn_gateway_id] = vpn_gateway_id
  client_opts[:vpc_id] = vpc_id(vpc)
  client.detach_vpn_gateway(client_opts)
  nil
end

def exists?
  begin
    client.describe_vpn_gateways(:vpn_gateway_ids => [id])
    true
  rescue Errors::InvalidVPNGatewayID::NotFound
    false
  end
end

def initialize vpn_gateway_id, options = {}
  @vpn_gateway_id = vpn_gateway_id
  super
end

def vpc
  if attachment = attachments.first
    attachment.vpc
  end
end

def vpc_id vpc
  vpc.is_a?(VPC) ? vpc.vpc_id : vpc
end

def vpn_connections
  connections = VPNConnectionCollection.new(:config => config)
  connections.filter('vpn-gateway-id', id)
end