package notify

import "errors"

var (
	errServiceShutdown   = errors.New("service shutdown")
	errTransportDetached = errors.New("transport detached")
)

func (c *ClientCommon) ensureClientSendReady() error {
	if !sessionIsAlive(&c.alive) {
		return errServiceShutdown
	}
	if !c.clientTransportAttachedSnapshot() {
		return clientTransportDetachedError(c)
	}
	return nil
}

func (s *ServerCommon) ensureServerSendReady(client *ClientConn) error {
	if client == nil {
		return s.ensureServerTransportSendReady(nil)
	}
	return s.ensureServerTransportSendReady(s.resolveOutboundTransport(logicalConnFromClient(client)))
}

func (s *ServerCommon) ensureServerTransportSendReady(transport *TransportConn) error {
	if !sessionIsAlive(&s.alive) {
		return errServiceShutdown
	}
	if s.serverUDPListenerSnapshot() != nil {
		if transport == nil || transport.RemoteAddr() == nil || !transport.IsCurrent() {
			return transportDetachedErrorForTransport(transport)
		}
		return nil
	}
	if transport == nil || !transport.Attached() || !transport.HasRuntimeConn() || !transport.IsCurrent() {
		return transportDetachedErrorForTransport(transport)
	}
	return nil
}