/*
* Copyright 2019-present Open Networking Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
 */
package device

import (
	"context"
	"github.com/gogo/protobuf/proto"
	"github.com/opencord/voltha-go/db/model"
	"github.com/opencord/voltha-go/rw_core/config"
	"github.com/opencord/voltha-go/rw_core/core/adapter"
	com "github.com/opencord/voltha-lib-go/v3/pkg/adapters/common"
	"github.com/opencord/voltha-lib-go/v3/pkg/db"
	"github.com/opencord/voltha-lib-go/v3/pkg/db/kvstore"
	"github.com/opencord/voltha-lib-go/v3/pkg/kafka"
	"github.com/opencord/voltha-lib-go/v3/pkg/log"
	mock_etcd "github.com/opencord/voltha-lib-go/v3/pkg/mocks/etcd"
	mock_kafka "github.com/opencord/voltha-lib-go/v3/pkg/mocks/kafka"
	ofp "github.com/opencord/voltha-protos/v3/go/openflow_13"
	"github.com/opencord/voltha-protos/v3/go/voltha"
	"github.com/phayes/freeport"
	"github.com/stretchr/testify/assert"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"math/rand"
	"sort"
	"strconv"
	"strings"
	"sync"
	"testing"
	"time"
)

type DATest struct {
	etcdServer       *mock_etcd.EtcdServer
	deviceMgr        *Manager
	logicalDeviceMgr *LogicalManager
	kmp              kafka.InterContainerProxy
	kClient          kafka.Client
	kvClientPort     int
	oltAdapterName   string
	onuAdapterName   string
	coreInstanceID   string
	defaultTimeout   time.Duration
	maxTimeout       time.Duration
	device           *voltha.Device
	done             chan int
}

func newDATest() *DATest {
	test := &DATest{}
	// Start the embedded etcd server
	var err error
	test.etcdServer, test.kvClientPort, err = startEmbeddedEtcdServer("voltha.rwcore.da.test", "voltha.rwcore.da.etcd", "error")
	if err != nil {
		logger.Fatal(err)
	}
	// Create the kafka client
	test.kClient = mock_kafka.NewKafkaClient()
	test.oltAdapterName = "olt_adapter_mock"
	test.onuAdapterName = "onu_adapter_mock"
	test.coreInstanceID = "rw-da-test"
	test.defaultTimeout = 5 * time.Second
	test.maxTimeout = 20 * time.Second
	test.done = make(chan int)
	parentID := com.GetRandomString(10)
	test.device = &voltha.Device{
		Type:         "onu_adapter_mock",
		ParentId:     parentID,
		ParentPortNo: 1,
		VendorId:     "onu_adapter_mock",
		Adapter:      "onu_adapter_mock",
		Vlan:         100,
		Address:      nil,
		ProxyAddress: &voltha.Device_ProxyAddress{
			DeviceId:           parentID,
			DeviceType:         "olt_adapter_mock",
			ChannelId:          100,
			ChannelGroupId:     0,
			ChannelTermination: "",
			OnuId:              2,
		},
		AdminState:    voltha.AdminState_PREPROVISIONED,
		OperStatus:    voltha.OperStatus_UNKNOWN,
		Reason:        "All good",
		ConnectStatus: voltha.ConnectStatus_UNKNOWN,
		Custom:        nil,
		Ports: []*voltha.Port{
			{PortNo: 1, Label: "pon-1", Type: voltha.Port_PON_ONU, AdminState: voltha.AdminState_ENABLED,
				OperStatus: voltha.OperStatus_ACTIVE, Peers: []*voltha.Port_PeerPort{{DeviceId: parentID, PortNo: 1}}},
			{PortNo: 100, Label: "uni-100", Type: voltha.Port_ETHERNET_UNI, AdminState: voltha.AdminState_ENABLED,
				OperStatus: voltha.OperStatus_ACTIVE},
		},
	}
	return test
}

type fakeEventCallbacks struct{}

func (fakeEventCallbacks) SendChangeEvent(_ string, _ *ofp.OfpPortStatus)      {}
func (fakeEventCallbacks) SendPacketIn(_ string, _ string, _ *ofp.OfpPacketIn) {}

func (dat *DATest) startCore(inCompeteMode bool) {
	cfg := config.NewRWCoreFlags()
	cfg.CorePairTopic = "rw_core"
	cfg.DefaultRequestTimeout = dat.defaultTimeout
	cfg.KVStorePort = dat.kvClientPort
	cfg.InCompetingMode = inCompeteMode
	grpcPort, err := freeport.GetFreePort()
	if err != nil {
		logger.Fatal("Cannot get a freeport for grpc")
	}
	cfg.GrpcPort = grpcPort
	cfg.GrpcHost = "127.0.0.1"
	client := setupKVClient(cfg, dat.coreInstanceID)
	backend := &db.Backend{
		Client:                  client,
		StoreType:               cfg.KVStoreType,
		Host:                    cfg.KVStoreHost,
		Port:                    cfg.KVStorePort,
		Timeout:                 cfg.KVStoreTimeout,
		LivenessChannelInterval: cfg.LiveProbeInterval / 2,
		PathPrefix:              cfg.KVStoreDataPrefix}
	dat.kmp = kafka.NewInterContainerProxy(
		kafka.InterContainerHost(cfg.KafkaAdapterHost),
		kafka.InterContainerPort(cfg.KafkaAdapterPort),
		kafka.MsgClient(dat.kClient),
		kafka.DefaultTopic(&kafka.Topic{Name: cfg.CoreTopic}),
		kafka.DeviceDiscoveryTopic(&kafka.Topic{Name: cfg.AffinityRouterTopic}))

	endpointMgr := kafka.NewEndpointManager(backend)
	proxy := model.NewProxy(backend, "/")
	adapterMgr := adapter.NewAdapterManager(proxy, dat.coreInstanceID, dat.kClient)

	dat.deviceMgr, dat.logicalDeviceMgr = NewDeviceManagers(proxy, adapterMgr, dat.kmp, endpointMgr, cfg.CorePairTopic, dat.coreInstanceID, cfg.DefaultCoreTimeout)
	dat.logicalDeviceMgr.SetEventCallbacks(fakeEventCallbacks{})
	if err = dat.kmp.Start(); err != nil {
		logger.Fatal("Cannot start InterContainerProxy")
	}
	if err = adapterMgr.Start(context.Background()); err != nil {
		logger.Fatal("Cannot start adapterMgr")
	}
	dat.deviceMgr.Start(context.Background())
	dat.logicalDeviceMgr.Start(context.Background())
}

func (dat *DATest) stopAll() {
	if dat.kClient != nil {
		dat.kClient.Stop()
	}
	if dat.logicalDeviceMgr != nil {
		dat.logicalDeviceMgr.Stop(context.Background())
	}
	if dat.deviceMgr != nil {
		dat.deviceMgr.Stop(context.Background())
	}
	if dat.kmp != nil {
		dat.kmp.Stop()
	}
	if dat.etcdServer != nil {
		stopEmbeddedEtcdServer(dat.etcdServer)
	}
}

//startEmbeddedEtcdServer creates and starts an Embedded etcd server locally.
func startEmbeddedEtcdServer(configName, storageDir, logLevel string) (*mock_etcd.EtcdServer, int, error) {
	kvClientPort, err := freeport.GetFreePort()
	if err != nil {
		return nil, 0, err
	}
	peerPort, err := freeport.GetFreePort()
	if err != nil {
		return nil, 0, err
	}
	etcdServer := mock_etcd.StartEtcdServer(mock_etcd.MKConfig(configName, kvClientPort, peerPort, storageDir, logLevel))
	if etcdServer == nil {
		return nil, 0, status.Error(codes.Internal, "Embedded server failed to start")
	}
	return etcdServer, kvClientPort, nil
}

func stopEmbeddedEtcdServer(server *mock_etcd.EtcdServer) {
	if server != nil {
		server.Stop()
	}
}

func setupKVClient(cf *config.RWCoreFlags, coreInstanceID string) kvstore.Client {
	addr := cf.KVStoreHost + ":" + strconv.Itoa(cf.KVStorePort)
	client, err := kvstore.NewEtcdClient(addr, cf.KVStoreTimeout, log.FatalLevel)
	if err != nil {
		panic("no kv client")
	}
	return client
}

func (dat *DATest) createDeviceAgent(t *testing.T) *Agent {
	deviceMgr := dat.deviceMgr
	clonedDevice := proto.Clone(dat.device).(*voltha.Device)
	deviceAgent := newAgent(deviceMgr.adapterProxy, clonedDevice, deviceMgr, deviceMgr.clusterDataProxy, deviceMgr.defaultTimeout)
	d, err := deviceAgent.start(context.TODO(), clonedDevice)
	assert.Nil(t, err)
	assert.NotNil(t, d)
	deviceMgr.addDeviceAgentToMap(deviceAgent)
	return deviceAgent
}

func (dat *DATest) updateDeviceConcurrently(t *testing.T, da *Agent, globalWG *sync.WaitGroup) {
	originalDevice, err := da.getDevice(context.Background())
	assert.Nil(t, err)
	assert.NotNil(t, originalDevice)
	var localWG sync.WaitGroup

	// Update device routine
	var (
		root         = false
		vendor       = "onu_adapter_mock"
		model        = "go-mock"
		serialNumber = com.GetRandomSerialNumber()
		macAddress   = strings.ToUpper(com.GetRandomMacAddress())
		vlan         = rand.Uint32()
		reason       = "testing concurrent device update"
		portToAdd    = &voltha.Port{PortNo: 101, Label: "uni-101", Type: voltha.Port_ETHERNET_UNI, AdminState: voltha.AdminState_ENABLED,
			OperStatus: voltha.OperStatus_ACTIVE}
	)
	localWG.Add(1)
	go func() {
		deviceToUpdate := proto.Clone(originalDevice).(*voltha.Device)
		deviceToUpdate.Root = root
		deviceToUpdate.Vendor = vendor
		deviceToUpdate.Model = model
		deviceToUpdate.SerialNumber = serialNumber
		deviceToUpdate.MacAddress = macAddress
		deviceToUpdate.Vlan = vlan
		deviceToUpdate.Reason = reason
		err := da.updateDeviceUsingAdapterData(context.Background(), deviceToUpdate)
		assert.Nil(t, err)
		localWG.Done()
	}()

	// Update the device status routine
	localWG.Add(1)
	go func() {
		err := da.updateDeviceStatus(context.Background(), voltha.OperStatus_ACTIVE, voltha.ConnectStatus_REACHABLE)
		assert.Nil(t, err)
		localWG.Done()
	}()

	// Add a port routine
	localWG.Add(1)
	go func() {
		err := da.addPort(context.Background(), portToAdd)
		assert.Nil(t, err)
		localWG.Done()
	}()

	// wait for go routines to be done
	localWG.Wait()

	expectedChange := proto.Clone(originalDevice).(*voltha.Device)
	expectedChange.OperStatus = voltha.OperStatus_ACTIVE
	expectedChange.ConnectStatus = voltha.ConnectStatus_REACHABLE
	expectedChange.Ports = append(expectedChange.Ports, portToAdd)
	expectedChange.Root = root
	expectedChange.Vendor = vendor
	expectedChange.Model = model
	expectedChange.SerialNumber = serialNumber
	expectedChange.MacAddress = macAddress
	expectedChange.Vlan = vlan
	expectedChange.Reason = reason

	updatedDevice, _ := da.getDevice(context.Background())
	assert.NotNil(t, updatedDevice)
	assert.True(t, proto.Equal(expectedChange, updatedDevice))

	globalWG.Done()
}

func TestConcurrentDevices(t *testing.T) {
	for i := 0; i < 2; i++ {
		da := newDATest()
		assert.NotNil(t, da)
		defer da.stopAll()

		// Start the Core
		da.startCore(false)

		var wg sync.WaitGroup
		numConCurrentDeviceAgents := 20
		for i := 0; i < numConCurrentDeviceAgents; i++ {
			wg.Add(1)
			a := da.createDeviceAgent(t)
			go da.updateDeviceConcurrently(t, a, &wg)
		}

		wg.Wait()
	}
}

func isFlowSliceEqual(a, b []*ofp.OfpFlowStats) bool {
	if len(a) != len(b) {
		return false
	}
	sort.Slice(a, func(i, j int) bool {
		return a[i].Id < a[j].Id
	})
	sort.Slice(b, func(i, j int) bool {
		return b[i].Id < b[j].Id
	})
	for idx := range a {
		if !proto.Equal(a[idx], b[idx]) {
			return false
		}
	}
	return true
}

func isGroupSliceEqual(a, b []*ofp.OfpGroupEntry) bool {
	if len(a) != len(b) {
		return false
	}
	sort.Slice(a, func(i, j int) bool {
		return a[i].Desc.GroupId < a[j].Desc.GroupId
	})
	sort.Slice(b, func(i, j int) bool {
		return b[i].Desc.GroupId < b[j].Desc.GroupId
	})
	for idx := range a {
		if !proto.Equal(a[idx], b[idx]) {
			return false
		}
	}
	return true
}

func TestFlowsToUpdateToDelete_EmptySlices(t *testing.T) {
	newFlows := []*ofp.OfpFlowStats{}
	existingFlows := []*ofp.OfpFlowStats{}
	expectedNewFlows := []*ofp.OfpFlowStats{}
	expectedFlowsToDelete := []*ofp.OfpFlowStats{}
	expectedUpdatedAllFlows := []*ofp.OfpFlowStats{}
	uNF, fD, uAF := flowsToUpdateToDelete(newFlows, existingFlows)
	assert.True(t, isFlowSliceEqual(uNF, expectedNewFlows))
	assert.True(t, isFlowSliceEqual(fD, expectedFlowsToDelete))
	assert.True(t, isFlowSliceEqual(uAF, expectedUpdatedAllFlows))
}

func TestFlowsToUpdateToDelete_NoExistingFlows(t *testing.T) {
	newFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	existingFlows := []*ofp.OfpFlowStats{}
	expectedNewFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	expectedFlowsToDelete := []*ofp.OfpFlowStats{}
	expectedUpdatedAllFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	uNF, fD, uAF := flowsToUpdateToDelete(newFlows, existingFlows)
	assert.True(t, isFlowSliceEqual(uNF, expectedNewFlows))
	assert.True(t, isFlowSliceEqual(fD, expectedFlowsToDelete))
	assert.True(t, isFlowSliceEqual(uAF, expectedUpdatedAllFlows))
}

func TestFlowsToUpdateToDelete_UpdateNoDelete(t *testing.T) {
	newFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	existingFlows := []*ofp.OfpFlowStats{
		{Id: 121, TableId: 1210, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1210000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 122, TableId: 1220, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1220000, PacketCount: 0},
	}
	expectedNewFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	expectedFlowsToDelete := []*ofp.OfpFlowStats{}
	expectedUpdatedAllFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
		{Id: 121, TableId: 1210, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1210000, PacketCount: 0},
		{Id: 122, TableId: 1220, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1220000, PacketCount: 0},
	}
	uNF, fD, uAF := flowsToUpdateToDelete(newFlows, existingFlows)
	assert.True(t, isFlowSliceEqual(uNF, expectedNewFlows))
	assert.True(t, isFlowSliceEqual(fD, expectedFlowsToDelete))
	assert.True(t, isFlowSliceEqual(uAF, expectedUpdatedAllFlows))
}

func TestFlowsToUpdateToDelete_UpdateAndDelete(t *testing.T) {
	newFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 20},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 10, Flags: 0, Cookie: 1250000, PacketCount: 0},
		{Id: 126, TableId: 1260, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1260000, PacketCount: 0},
		{Id: 127, TableId: 1270, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1270000, PacketCount: 0},
	}
	existingFlows := []*ofp.OfpFlowStats{
		{Id: 121, TableId: 1210, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1210000, PacketCount: 0},
		{Id: 122, TableId: 1220, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1220000, PacketCount: 0},
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	expectedNewFlows := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 20},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 10, Flags: 0, Cookie: 1250000, PacketCount: 0},
		{Id: 126, TableId: 1260, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1260000, PacketCount: 0},
		{Id: 127, TableId: 1270, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1270000, PacketCount: 0},
	}
	expectedFlowsToDelete := []*ofp.OfpFlowStats{
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1250000, PacketCount: 0},
	}
	expectedUpdatedAllFlows := []*ofp.OfpFlowStats{
		{Id: 121, TableId: 1210, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1210000, PacketCount: 0},
		{Id: 122, TableId: 1220, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1220000, PacketCount: 0},
		{Id: 123, TableId: 1230, Priority: 100, IdleTimeout: 0, Flags: 0, Cookie: 1230000, PacketCount: 20},
		{Id: 124, TableId: 1240, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1240000, PacketCount: 0},
		{Id: 125, TableId: 1250, Priority: 1000, IdleTimeout: 10, Flags: 0, Cookie: 1250000, PacketCount: 0},
		{Id: 126, TableId: 1260, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1260000, PacketCount: 0},
		{Id: 127, TableId: 1270, Priority: 1000, IdleTimeout: 0, Flags: 0, Cookie: 1270000, PacketCount: 0},
	}
	uNF, fD, uAF := flowsToUpdateToDelete(newFlows, existingFlows)
	assert.True(t, isFlowSliceEqual(uNF, expectedNewFlows))
	assert.True(t, isFlowSliceEqual(fD, expectedFlowsToDelete))
	assert.True(t, isFlowSliceEqual(uAF, expectedUpdatedAllFlows))
}

func TestGroupsToUpdateToDelete_EmptySlices(t *testing.T) {
	newGroups := []*ofp.OfpGroupEntry{}
	existingGroups := []*ofp.OfpGroupEntry{}
	expectedNewGroups := []*ofp.OfpGroupEntry{}
	expectedGroupsToDelete := []*ofp.OfpGroupEntry{}
	expectedUpdatedAllGroups := []*ofp.OfpGroupEntry{}
	uNG, gD, uAG := groupsToUpdateToDelete(newGroups, existingGroups)
	assert.True(t, isGroupSliceEqual(uNG, expectedNewGroups))
	assert.True(t, isGroupSliceEqual(gD, expectedGroupsToDelete))
	assert.True(t, isGroupSliceEqual(uAG, expectedUpdatedAllGroups))
}

func TestGroupsToUpdateToDelete_NoExistingGroups(t *testing.T) {
	newGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
	}
	existingGroups := []*ofp.OfpGroupEntry{}
	expectedNewGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
	}
	expectedGroupsToDelete := []*ofp.OfpGroupEntry{}
	expectedUpdatedAllGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
	}
	uNG, gD, uAG := groupsToUpdateToDelete(newGroups, existingGroups)
	assert.True(t, isGroupSliceEqual(uNG, expectedNewGroups))
	assert.True(t, isGroupSliceEqual(gD, expectedGroupsToDelete))
	assert.True(t, isGroupSliceEqual(uAG, expectedUpdatedAllGroups))
}

func TestGroupsToUpdateToDelete_UpdateNoDelete(t *testing.T) {
	newGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
	}
	existingGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 3, GroupId: 30, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 4, GroupId: 40, Buckets: nil}},
	}
	expectedNewGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
	}
	expectedGroupsToDelete := []*ofp.OfpGroupEntry{}
	expectedUpdatedAllGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 3, GroupId: 30, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 4, GroupId: 40, Buckets: nil}},
	}
	uNG, gD, uAG := groupsToUpdateToDelete(newGroups, existingGroups)
	assert.True(t, isGroupSliceEqual(uNG, expectedNewGroups))
	assert.True(t, isGroupSliceEqual(gD, expectedGroupsToDelete))
	assert.True(t, isGroupSliceEqual(uAG, expectedUpdatedAllGroups))
}

func TestGroupsToUpdateToDelete_UpdateWithDelete(t *testing.T) {
	newGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: []*ofp.OfpBucket{{WatchPort: 10}}}},
	}
	existingGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 3, GroupId: 30, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 4, GroupId: 40, Buckets: nil}},
	}
	expectedNewGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: []*ofp.OfpBucket{{WatchPort: 10}}}},
	}
	expectedGroupsToDelete := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: nil}},
	}
	expectedUpdatedAllGroups := []*ofp.OfpGroupEntry{
		{Desc: &ofp.OfpGroupDesc{Type: 1, GroupId: 10, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 2, GroupId: 20, Buckets: []*ofp.OfpBucket{{WatchPort: 10}}}},
		{Desc: &ofp.OfpGroupDesc{Type: 3, GroupId: 30, Buckets: nil}},
		{Desc: &ofp.OfpGroupDesc{Type: 4, GroupId: 40, Buckets: nil}},
	}
	uNG, gD, uAG := groupsToUpdateToDelete(newGroups, existingGroups)
	assert.True(t, isGroupSliceEqual(uNG, expectedNewGroups))
	assert.True(t, isGroupSliceEqual(gD, expectedGroupsToDelete))
	assert.True(t, isGroupSliceEqual(uAG, expectedUpdatedAllGroups))
}