package notify

import (
	"errors"
	"net"
)

func (s *ServerCommon) stopClientSession(client *ClientConn, reason string, err error) {
	if client == nil {
		return
	}
	if runtime := s.getStreamRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(client), streamRuntimeCloseError(err))
	}
	if runtime := s.getBulkRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(client), bulkRuntimeCloseError(err))
	}
	if transfers := s.getTransferState(); transfers != nil {
		transfers.closeScope(serverFileScope(client), err)
	}
	client.stopServerOwnedSessionWith(s.removeClient, reason, err)
}

func (s *ServerCommon) stopLogicalSession(logical *LogicalConn, reason string, err error) {
	if logical == nil {
		return
	}
	if runtime := s.getStreamRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(logical), streamRuntimeCloseError(err))
	}
	if runtime := s.getBulkRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(logical), bulkRuntimeCloseError(err))
	}
	if transfers := s.getTransferState(); transfers != nil {
		transfers.closeScope(serverFileScope(logical), err)
	}
	logical.stopServerOwnedSessionWith(s.removeLogical, reason, err)
}

func (s *ServerCommon) detachClientSessionTransport(client *ClientConn, reason string, err error) {
	if s == nil || client == nil {
		return
	}
	if !client.clientConnTransportAttachedSnapshot() {
		return
	}
	client.markClientConnTransportDetached(reason, err)
	s.getPendingWaitPool().closeScope(serverTransportScope(client))
	s.getPendingWaitPool().closeScope(serverFileScope(client))
	s.getFileAckPool().closeScope(serverTransportScope(client))
	s.getFileAckPool().closeScope(serverFileScope(client))
	s.getSignalAckPool().closeScope(serverTransportScope(client))
	s.getSignalAckPool().closeScope(serverFileScope(client))
	if runtime := s.getStreamRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(client), errTransportDetached)
	}
	if runtime := s.getBulkRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(client), errTransportDetached)
	}
	s.closeServerDedicatedSidecar(logicalConnFromClient(client))
	client.detachServerOwnedTransport()
}

func (s *ServerCommon) detachLogicalSessionTransport(logical *LogicalConn, reason string, err error) {
	if s == nil || logical == nil {
		return
	}
	if !logical.transportAttachedSnapshot() {
		return
	}
	logical.markTransportDetached(reason, err)
	s.getPendingWaitPool().closeScope(serverTransportScope(logical))
	s.getPendingWaitPool().closeScope(serverFileScope(logical))
	s.getFileAckPool().closeScope(serverTransportScope(logical))
	s.getFileAckPool().closeScope(serverFileScope(logical))
	s.getSignalAckPool().closeScope(serverTransportScope(logical))
	s.getSignalAckPool().closeScope(serverFileScope(logical))
	if runtime := s.getStreamRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(logical), errTransportDetached)
	}
	if runtime := s.getBulkRuntime(); runtime != nil {
		runtime.closeScope(serverFileScope(logical), errTransportDetached)
	}
	s.closeServerDedicatedSidecar(logical)
	logical.detachServerOwnedTransport()
}

func (s *ServerCommon) newAcceptedClient(id string, addr net.Addr) *ClientConn {
	logical := s.newAcceptedLogical(id, addr)
	if logical == nil {
		return nil
	}
	return logical.compatClientConn()
}

func (s *ServerCommon) newAcceptedLogical(id string, addr net.Addr) *LogicalConn {
	if s == nil {
		return nil
	}
	return newServerLogicalConn(s, id, addr)
}

func (s *ServerCommon) registerAcceptedClient(client *ClientConn) *LogicalConn {
	return s.registerAcceptedLogical(logicalConnFromClient(client))
}

func (s *ServerCommon) registerAcceptedLogical(logical *LogicalConn) *LogicalConn {
	if s == nil || logical == nil {
		return nil
	}
	logical.setServer(s)
	logical.applyAttachmentProfile(s.maxReadTimeout, s.maxWriteTimeout, s.defaultMsgEn, s.defaultMsgDe, s.defaultFastStreamEncode, s.defaultFastBulkEncode, s.defaultFastPlainEncode, s.handshakeRsaKey, s.SecretKey)
	logical.updateAttachmentState(func(state *clientConnAttachmentState) {
		state.authMode = s.securityAuthMode
		state.peerAttached = false
		state.peerAttachFallback = false
		state.peerAttachAt = 0
	})
	if s.securityConfigured {
		logical.applyTransportProtectionProfile(s.securityBootstrap)
	} else {
		logical.setModernPSKRuntime(s.defaultModernPSKRuntime)
	}
	logical.markHeartbeatNow()
	return s.getPeerRegistry().registerLogical(logical)
}

func (s *ServerCommon) renameAcceptedLogical(logical *LogicalConn, id string) error {
	if s == nil {
		return errors.New("server is nil")
	}
	if logical == nil {
		return errors.New("logical conn is nil")
	}
	if id == "" {
		return errors.New("client id is empty")
	}
	if logical.ID() == id {
		return nil
	}
	return s.getPeerRegistry().renameLogical(logical, id)
}

func (s *ServerCommon) renameAcceptedClient(client *ClientConn, id string) error {
	return s.renameAcceptedLogical(logicalConnFromClient(client), id)
}

func (c *LogicalConn) inheritAcceptedLogicalTransportState(src *LogicalConn) {
	if c == nil || src == nil {
		return
	}
	c.inheritAttachmentProfile(src)
	if addr := src.RemoteAddr(); addr != nil {
		c.setRemoteAddr(addr)
	}
}

func (c *LogicalConn) attachAcceptedTransport(addr net.Addr, tuConn net.Conn) error {
	if c == nil {
		return errors.New("logical conn is nil")
	}
	if addr == nil && tuConn != nil {
		addr = tuConn.RemoteAddr()
	}
	if addr != nil {
		c.setRemoteAddr(addr)
	}
	if tuConn == nil {
		return nil
	}
	c.markHeartbeatNow()
	c.clearTransportDetachState()
	if c.sessionRuntimeSnapshot() == nil {
		c.startSessionTransport(tuConn, nil, nil)
		return nil
	}
	return c.attachSessionTransport(tuConn)
}

func (s *ServerCommon) attachAcceptedLogicalTransport(logical *LogicalConn, addr net.Addr, tuConn net.Conn) error {
	if s == nil {
		return errors.New("server is nil")
	}
	if logical == nil {
		return errors.New("logical conn is nil")
	}
	logical.setServer(s)
	return logical.attachAcceptedTransport(addr, tuConn)
}

func (s *ServerCommon) attachAcceptedClientTransport(client *ClientConn, addr net.Addr, tuConn net.Conn) error {
	return s.attachAcceptedLogicalTransport(logicalConnFromClient(client), addr, tuConn)
}

func (s *ServerCommon) handoffAcceptedLogicalTransport(dst *LogicalConn, src *LogicalConn) error {
	if s == nil {
		return errors.New("server is nil")
	}
	if dst == nil {
		return errors.New("destination logical conn is nil")
	}
	if src == nil {
		return errors.New("source logical conn is nil")
	}
	if dst == src {
		return nil
	}
	addr := src.RemoteAddr()
	conn, err := src.detachTransportForTransfer()
	if err != nil {
		return err
	}
	if err := s.attachAcceptedLogicalTransport(dst, addr, conn); err != nil {
		if conn != nil {
			_ = conn.Close()
		}
		return err
	}
	dst.inheritAcceptedLogicalTransportState(src)
	src.markSessionStopped("peer transport handed off", nil)
	s.removeLogical(src)
	return nil
}

func (s *ServerCommon) handoffAcceptedClientTransport(dst *ClientConn, src *ClientConn) error {
	return s.handoffAcceptedLogicalTransport(logicalConnFromClient(dst), logicalConnFromClient(src))
}

func (s *ServerCommon) upsertAcceptedLogical(id string, addr net.Addr, tuConn net.Conn) (*LogicalConn, bool, error) {
	if s == nil {
		return nil, false, errors.New("server is nil")
	}
	if id == "" {
		return nil, false, errors.New("client id is empty")
	}
	if existing := s.GetLogicalConn(id); existing != nil {
		if err := s.attachAcceptedLogicalTransport(existing, addr, tuConn); err != nil {
			if tuConn != nil {
				_ = tuConn.Close()
			}
			return nil, true, err
		}
		return existing, true, nil
	}
	logical := s.newAcceptedLogical(id, addr)
	if logical == nil {
		return nil, false, errors.New("accepted logical is nil")
	}
	logical = s.registerAcceptedLogical(logical)
	if logical == nil {
		return nil, false, errors.New("accepted logical is nil")
	}
	if err := s.attachAcceptedLogicalTransport(logical, addr, tuConn); err != nil {
		if tuConn != nil {
			_ = tuConn.Close()
		}
		s.removeLogical(logical)
		return nil, false, err
	}
	if tuConn == nil {
		logical.startSession(nil, nil, nil)
	}
	return logical, false, nil
}

func (s *ServerCommon) upsertAcceptedClient(id string, addr net.Addr, tuConn net.Conn) (*ClientConn, bool, error) {
	logical, reused, err := s.upsertAcceptedLogical(id, addr, tuConn)
	if logical == nil {
		return nil, reused, err
	}
	return logical.compatClientConn(), reused, err
}

func (s *ServerCommon) bootstrapAcceptedLogical(id string, addr net.Addr, tuConn net.Conn) *LogicalConn {
	logical, _, err := s.upsertAcceptedLogical(id, addr, tuConn)
	if err != nil {
		return nil
	}
	return logical
}

func (s *ServerCommon) bootstrapAcceptedClient(id string, addr net.Addr, tuConn net.Conn) *ClientConn {
	logical := s.bootstrapAcceptedLogical(id, addr, tuConn)
	if logical == nil {
		return nil
	}
	return logical.compatClientConn()
}