package channel

import (
	"context"
	"strings"
	"testing"

	"github.com/cockroachdb/errors"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
	"google.golang.org/protobuf/proto"

	"github.com/milvus-io/milvus-proto/go-api/v3/commonpb"
	"github.com/milvus-io/milvus/internal/mocks/mock_metastore"
	"github.com/milvus-io/milvus/internal/streamingcoord/server/resource"
	"github.com/milvus-io/milvus/internal/util/sessionutil"
	"github.com/milvus-io/milvus/internal/util/streamingutil/util"
	"github.com/milvus-io/milvus/pkg/v3/proto/streamingpb"
	"github.com/milvus-io/milvus/pkg/v3/streaming/util/message"
	"github.com/milvus-io/milvus/pkg/v3/streaming/util/types"
	"github.com/milvus-io/milvus/pkg/v3/streaming/walimpls/impls/walimplstest"
	"github.com/milvus-io/milvus/pkg/v3/util/replicateutil"
	"github.com/milvus-io/milvus/pkg/v3/util/syncutil"
)

func TestChannelManager(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	// Test recover failure.
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{
		Version: 1,
	}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return(nil, errors.New("recover failure"))
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)
	m, err := RecoverChannelManager(ctx)
	assert.Nil(t, m)
	assert.Error(t, err)

	catalog.EXPECT().ListPChannel(mock.Anything).Unset()
	catalog.EXPECT().ListPChannel(mock.Anything).RunAndReturn(func(ctx context.Context) ([]*streamingpb.PChannelMeta, error) {
		return []*streamingpb.PChannelMeta{
			{
				Channel: &streamingpb.PChannelInfo{
					Name: "test-channel",
					Term: 1,
				},
				Node: &streamingpb.StreamingNodeInfo{
					ServerId: 1,
				},
			},
		}, nil
	})
	m, err = RecoverChannelManager(ctx)
	assert.NotNil(t, m)
	assert.NoError(t, err)

	// Test getClusterChannels and singleton GetClusterChannels.
	cc := m.getClusterChannels()
	assert.Equal(t, []string{"test-channel"}, cc.Channels)
	assert.NotEmpty(t, cc.ControlChannel)
	assert.True(t, strings.HasPrefix(cc.ControlChannel, "test"))
	singletonCC := GetClusterChannels()
	assert.Equal(t, cc, singletonCC)

	// Test update non exist pchannel
	modified, err := m.AssignPChannels(ctx, map[ChannelID]types.PChannelInfoAssigned{newChannelID("non-exist-channel"): {
		Channel: types.PChannelInfo{
			Name:       "non-exist-channel",
			Term:       1,
			AccessMode: types.AccessModeRW,
		},
		Node: types.StreamingNodeInfo{ServerID: 2},
	}})
	assert.Nil(t, modified)
	assert.ErrorIs(t, err, ErrChannelNotExist)
	err = m.AssignPChannelsDone(ctx, []ChannelID{newChannelID("non-exist-channel")})
	assert.ErrorIs(t, err, ErrChannelNotExist)
	err = m.MarkAsUnavailable(ctx, []types.PChannelInfo{{
		Name: "non-exist-channel",
		Term: 2,
	}})
	assert.ErrorIs(t, err, ErrChannelNotExist)

	// Test success.
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Unset()
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).RunAndReturn(func(ctx context.Context, pm []*streamingpb.PChannelMeta) error {
		return nil
	})
	modified, err = m.AssignPChannels(ctx, map[ChannelID]types.PChannelInfoAssigned{newChannelID("test-channel"): {
		Channel: types.PChannelInfo{
			Name:       "test-channel",
			Term:       1,
			AccessMode: types.AccessModeRW,
		},
		Node: types.StreamingNodeInfo{ServerID: 2},
	}})
	assert.NotNil(t, modified)
	assert.NoError(t, err)
	assert.Len(t, modified, 1)
	err = m.AssignPChannelsDone(ctx, []ChannelID{newChannelID("test-channel")})
	assert.NoError(t, err)

	nodeID, ok := m.GetLatestWALLocated(ctx, "test-channel")
	assert.True(t, ok)
	assert.NotZero(t, nodeID)

	err = m.MarkAsUnavailable(ctx, []types.PChannelInfo{{
		Name: "test-channel",
		Term: 2,
	}})
	assert.NoError(t, err)

	view := m.CurrentPChannelsView()
	assert.NotNil(t, view)
	assert.Equal(t, len(view.Channels), 1)
	channel, ok := view.Channels[newChannelID("test-channel")]
	assert.True(t, ok)
	assert.NotNil(t, channel)

	nodeID, ok = m.GetLatestWALLocated(ctx, "test-channel")
	assert.False(t, ok)
	assert.Zero(t, nodeID)

	t.Run("UpdateReplicateConfiguration", func(t *testing.T) {
		param, err := m.GetLatestChannelAssignment()
		oldLocalVersion := param.Version.Local
		assert.NoError(t, err)
		assert.Equal(t, m.ReplicateRole(), replicateutil.RolePrimary)

		// Test update replicate configurations
		cfg := &commonpb.ReplicateConfiguration{
			Clusters: []*commonpb.MilvusCluster{
				{ClusterId: "by-dev", Pchannels: []string{"by-dev-test-channel-1", "by-dev-test-channel-2"}},
				{ClusterId: "by-dev2", Pchannels: []string{"by-dev2-test-channel-1", "by-dev2-test-channel-2"}},
			},
			CrossClusterTopology: []*commonpb.CrossClusterTopology{
				{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
			},
		}
		msg := message.NewAlterReplicateConfigMessageBuilderV2().
			WithHeader(&message.AlterReplicateConfigMessageHeader{
				ReplicateConfiguration: cfg,
			}).
			WithBody(&message.AlterReplicateConfigMessageBody{}).
			WithBroadcast([]string{"by-dev-test-channel-1", "by-dev-test-channel-2"}).
			MustBuildBroadcast()

		result := message.BroadcastResultAlterReplicateConfigMessageV2{
			Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(msg),
			Results: map[string]*message.AppendResult{
				"by-dev-test-channel-1": {
					MessageID:              walimplstest.NewTestMessageID(1),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(2),
					TimeTick:               1,
				},
				"by-dev-test-channel-2": {
					MessageID:              walimplstest.NewTestMessageID(3),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(4),
					TimeTick:               1,
				},
			},
		}

		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(
			func(ctx context.Context, config *streamingpb.ReplicateConfigurationMeta, replicatingTasks []*streamingpb.ReplicatePChannelMeta) error {
				assert.True(t, proto.Equal(config.ReplicateConfiguration, cfg))
				assert.Len(t, replicatingTasks, 2)
				for _, task := range replicatingTasks {
					result := result.Results[task.GetSourceChannelName()]
					assert.True(t, result.LastConfirmedMessageID.EQ(message.MustUnmarshalMessageID(task.InitializedCheckpoint.MessageId)))
					assert.Equal(t, result.TimeTick, task.InitializedCheckpoint.TimeTick)
					assert.Equal(t, task.GetTargetChannelName(), strings.Replace(task.GetSourceChannelName(), "by-dev", "by-dev2", 1))
					assert.Equal(t, task.GetTargetCluster().GetClusterId(), "by-dev2")
				}
				return nil
			})
		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)
		param, err = m.GetLatestChannelAssignment()
		assert.Equal(t, param.Version.Local, oldLocalVersion+1)
		assert.NoError(t, err)
		assert.Equal(t, m.ReplicateRole(), replicateutil.RolePrimary)

		// test idempotency
		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)
		param, err = m.GetLatestChannelAssignment()
		assert.Equal(t, param.Version.Local, oldLocalVersion+1)
		assert.NoError(t, err)
		assert.Equal(t, m.ReplicateRole(), replicateutil.RolePrimary)

		// Add more pchannels into existing clusters.
		cfg = &commonpb.ReplicateConfiguration{
			Clusters: []*commonpb.MilvusCluster{
				{ClusterId: "by-dev", Pchannels: []string{"by-dev-test-channel-1", "by-dev-test-channel-2", "by-dev-test-channel-3"}},
				{ClusterId: "by-dev2", Pchannels: []string{"by-dev2-test-channel-1", "by-dev2-test-channel-2", "by-dev2-test-channel-3"}},
			},
			CrossClusterTopology: []*commonpb.CrossClusterTopology{
				{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
			},
		}
		msg = message.NewAlterReplicateConfigMessageBuilderV2().
			WithHeader(&message.AlterReplicateConfigMessageHeader{
				ReplicateConfiguration: cfg,
			}).
			WithBody(&message.AlterReplicateConfigMessageBody{}).
			WithBroadcast([]string{"by-dev-test-channel-1", "by-dev-test-channel-2", "by-dev-test-channel-3"}).
			MustBuildBroadcast()
		result = message.BroadcastResultAlterReplicateConfigMessageV2{
			Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(msg),
			Results: map[string]*message.AppendResult{
				"by-dev-test-channel-1": {
					MessageID:              walimplstest.NewTestMessageID(1),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(2),
					TimeTick:               1,
				},
				"by-dev-test-channel-2": {
					MessageID:              walimplstest.NewTestMessageID(3),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(4),
					TimeTick:               1,
				},
				"by-dev-test-channel-3": {
					MessageID:              walimplstest.NewTestMessageID(5),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(6),
					TimeTick:               1,
				},
			},
		}
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).Unset()
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(
			func(ctx context.Context, config *streamingpb.ReplicateConfigurationMeta, replicatingTasks []*streamingpb.ReplicatePChannelMeta) error {
				assert.True(t, proto.Equal(config.ReplicateConfiguration, cfg))
				assert.Len(t, replicatingTasks, 1) // only one new pchannel task for the appended channel.
				for _, task := range replicatingTasks {
					assert.Equal(t, task.GetSourceChannelName(), "by-dev-test-channel-3")
					result := result.Results[task.GetSourceChannelName()]
					assert.True(t, result.LastConfirmedMessageID.EQ(message.MustUnmarshalMessageID(task.InitializedCheckpoint.MessageId)))
					// For pchannel-increasing tasks, TimeTick is decremented by 1 so the CDC scanner
					// includes the AlterReplicateConfig message itself (DeliverFilterTimeTickGT is strict).
					assert.Equal(t, result.TimeTick-1, task.InitializedCheckpoint.TimeTick)
					assert.True(t, task.GetSkipGetReplicateCheckpoint())
					assert.Equal(t, task.GetTargetChannelName(), strings.Replace(task.GetSourceChannelName(), "by-dev", "by-dev2", 1))
					assert.Equal(t, task.GetTargetCluster().GetClusterId(), "by-dev2")
				}
				return nil
			})

		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)
		param, err = m.GetLatestChannelAssignment()
		assert.NoError(t, err)
		assert.Equal(t, param.Version.Local, oldLocalVersion+2)

		// Add new cluster into existing config.
		cfg = &commonpb.ReplicateConfiguration{
			Clusters: []*commonpb.MilvusCluster{
				{ClusterId: "by-dev", Pchannels: []string{"by-dev-test-channel-1", "by-dev-test-channel-2"}},
				{ClusterId: "by-dev2", Pchannels: []string{"by-dev2-test-channel-1", "by-dev2-test-channel-2"}},
				{ClusterId: "by-dev3", Pchannels: []string{"by-dev3-test-channel-1", "by-dev3-test-channel-2"}},
			},
			CrossClusterTopology: []*commonpb.CrossClusterTopology{
				{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
				{SourceClusterId: "by-dev", TargetClusterId: "by-dev3"},
			},
		}
		msg = message.NewAlterReplicateConfigMessageBuilderV2().
			WithHeader(&message.AlterReplicateConfigMessageHeader{
				ReplicateConfiguration: cfg,
			}).
			WithBody(&message.AlterReplicateConfigMessageBody{}).
			WithBroadcast([]string{"by-dev-test-channel-1", "by-dev-test-channel-2"}).
			MustBuildBroadcast()
		result = message.BroadcastResultAlterReplicateConfigMessageV2{
			Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(msg),
			Results: map[string]*message.AppendResult{
				"by-dev-test-channel-1": {
					MessageID:              walimplstest.NewTestMessageID(1),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(2),
					TimeTick:               1,
				},
				"by-dev-test-channel-2": {
					MessageID:              walimplstest.NewTestMessageID(3),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(4),
					TimeTick:               1,
				},
			},
		}
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).Unset()
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(
			func(ctx context.Context, config *streamingpb.ReplicateConfigurationMeta, replicatingTasks []*streamingpb.ReplicatePChannelMeta) error {
				assert.True(t, proto.Equal(config.ReplicateConfiguration, cfg))
				assert.Len(t, replicatingTasks, 2) // here should be two new incoming tasks.
				for _, task := range replicatingTasks {
					assert.Equal(t, task.GetTargetCluster().GetClusterId(), "by-dev3")
					result := result.Results[task.GetSourceChannelName()]
					assert.True(t, result.LastConfirmedMessageID.EQ(message.MustUnmarshalMessageID(task.InitializedCheckpoint.MessageId)))
					assert.Equal(t, result.TimeTick, task.InitializedCheckpoint.TimeTick)
					assert.Equal(t, task.GetTargetChannelName(), strings.Replace(task.GetSourceChannelName(), "by-dev", "by-dev3", 1))
					assert.Equal(t, task.GetTargetCluster().GetClusterId(), "by-dev3")
				}
				return nil
			})

		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)

		param, err = m.GetLatestChannelAssignment()
		assert.NoError(t, err)
		assert.Equal(t, param.Version.Local, oldLocalVersion+3)
		assert.True(t, proto.Equal(param.ReplicateConfiguration, cfg))
		assert.Equal(t, m.ReplicateRole(), replicateutil.RolePrimary)

		// switch into secondary
		cfg = &commonpb.ReplicateConfiguration{
			Clusters: []*commonpb.MilvusCluster{
				{ClusterId: "by-dev", Pchannels: []string{"by-dev-test-channel-1", "by-dev-test-channel-2"}},
				{ClusterId: "by-dev2", Pchannels: []string{"by-dev2-test-channel-1", "by-dev2-test-channel-2"}},
				{ClusterId: "by-dev3", Pchannels: []string{"by-dev3-test-channel-1", "by-dev3-test-channel-2"}},
			},
			CrossClusterTopology: []*commonpb.CrossClusterTopology{
				{SourceClusterId: "by-dev2", TargetClusterId: "by-dev"},
				{SourceClusterId: "by-dev2", TargetClusterId: "by-dev3"},
			},
		}
		msg = message.NewAlterReplicateConfigMessageBuilderV2().
			WithHeader(&message.AlterReplicateConfigMessageHeader{
				ReplicateConfiguration: cfg,
			}).
			WithBody(&message.AlterReplicateConfigMessageBody{}).
			WithBroadcast([]string{"by-dev-test-channel-1", "by-dev-test-channel-2"}).
			MustBuildBroadcast()
		result = message.BroadcastResultAlterReplicateConfigMessageV2{
			Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(msg),
			Results: map[string]*message.AppendResult{
				"by-dev-test-channel-1": {
					MessageID:              walimplstest.NewTestMessageID(1),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(2),
					TimeTick:               1,
				},
				"by-dev-test-channel-2": {
					MessageID:              walimplstest.NewTestMessageID(3),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(4),
					TimeTick:               1,
				},
			},
		}
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).Unset()
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(
			func(ctx context.Context, config *streamingpb.ReplicateConfigurationMeta, replicatingTasks []*streamingpb.ReplicatePChannelMeta) error {
				assert.True(t, proto.Equal(config.ReplicateConfiguration, cfg))
				assert.Len(t, replicatingTasks, 0) // here should be two new incoming tasks.
				return nil
			})
		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)
		err = m.UpdateReplicateConfiguration(ctx, result)
		assert.NoError(t, err)

		param, err = m.GetLatestChannelAssignment()
		assert.NoError(t, err)
		assert.Equal(t, param.Version.Local, oldLocalVersion+4)
		assert.True(t, proto.Equal(param.ReplicateConfiguration, cfg))
		assert.Equal(t, m.ReplicateRole(), replicateutil.RoleSecondary)

		// Force promote to standalone primary
		forcePromoteCfg := &commonpb.ReplicateConfiguration{
			Clusters: []*commonpb.MilvusCluster{
				{ClusterId: "by-dev", Pchannels: []string{"by-dev-test-channel-1", "by-dev-test-channel-2"}},
			},
		}
		forcePromoteMsg := message.NewAlterReplicateConfigMessageBuilderV2().
			WithHeader(&message.AlterReplicateConfigMessageHeader{
				ReplicateConfiguration: forcePromoteCfg,
				ForcePromote:           true,
			}).
			WithBody(&message.AlterReplicateConfigMessageBody{}).
			WithBroadcast([]string{"by-dev-test-channel-1", "by-dev-test-channel-2"}).
			MustBuildBroadcast()
		forcePromoteResult := message.BroadcastResultAlterReplicateConfigMessageV2{
			Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(forcePromoteMsg),
			Results: map[string]*message.AppendResult{
				"by-dev-test-channel-1": {
					MessageID:              walimplstest.NewTestMessageID(10),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(11),
					TimeTick:               100,
				},
				"by-dev-test-channel-2": {
					MessageID:              walimplstest.NewTestMessageID(12),
					LastConfirmedMessageID: walimplstest.NewTestMessageID(13),
					TimeTick:               100,
				},
			},
		}
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).Unset()
		catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(
			func(ctx context.Context, config *streamingpb.ReplicateConfigurationMeta, replicatingTasks []*streamingpb.ReplicatePChannelMeta) error {
				assert.True(t, proto.Equal(config.ReplicateConfiguration, forcePromoteCfg))
				assert.True(t, config.ForcePromoted)
				assert.Len(t, replicatingTasks, 0) // standalone primary has no replication targets
				return nil
			})
		err = m.UpdateReplicateConfiguration(ctx, forcePromoteResult)
		assert.NoError(t, err)

		param, err = m.GetLatestChannelAssignment()
		assert.NoError(t, err)
		assert.Equal(t, param.Version.Local, oldLocalVersion+5)
		assert.True(t, proto.Equal(param.ReplicateConfiguration, forcePromoteCfg))
		assert.Equal(t, m.ReplicateRole(), replicateutil.RolePrimary)
	})
}

func TestAllocVirtualChannels(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))
	// Test recover failure.
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil).Maybe()
	catalog.EXPECT().GetVersion(mock.Anything).Return(nil, nil).Maybe()
	catalog.EXPECT().SaveVersion(mock.Anything, mock.Anything).Return(nil).Maybe()
	catalog.EXPECT().ListPChannel(mock.Anything).Return(nil, nil).Maybe()
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil).Maybe()

	ctx := context.Background()
	newIncomingTopics := util.GetAllTopicsFromConfiguration()
	m, err := RecoverChannelManager(ctx, newIncomingTopics.Collect()...)
	assert.NoError(t, err)
	assert.NotNil(t, m)

	allocVChannels, err := m.AllocVirtualChannels(ctx, AllocVChannelParam{
		CollectionID: 1,
		Num:          256,
	})
	assert.Error(t, err)
	assert.Nil(t, allocVChannels, 0)

	StaticPChannelStatsManager.Get().AddVChannel("by-dev-rootcoord-dml_0_100v0", "by-dev-rootcoord-dml_0_101v0", "by-dev-rootcoord-dml_1_100v1")

	allocVChannels, err = m.AllocVirtualChannels(ctx, AllocVChannelParam{
		CollectionID: 1,
		Num:          4,
	})
	assert.NoError(t, err)
	assert.Len(t, allocVChannels, 4)
	assert.Equal(t, allocVChannels[0], "by-dev-rootcoord-dml_10_1v0")
	assert.Equal(t, allocVChannels[1], "by-dev-rootcoord-dml_11_1v1")
	assert.Equal(t, allocVChannels[2], "by-dev-rootcoord-dml_12_1v2")
	assert.Equal(t, allocVChannels[3], "by-dev-rootcoord-dml_13_1v3")
}

func TestStreamingEnableChecker(t *testing.T) {
	ctx := context.Background()
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))
	// Test recover failure.
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(nil, nil)
	catalog.EXPECT().SaveVersion(mock.Anything, mock.Anything).Return(nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return(nil, nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)

	m, err := RecoverChannelManager(ctx, "test-channel")
	assert.NoError(t, err)

	assert.False(t, m.IsStreamingEnabledOnce())

	n := syncutil.NewAsyncTaskNotifier[struct{}]()
	m.RegisterStreamingEnabledNotifier(n)
	assert.NoError(t, n.Context().Err())

	go func() {
		defer n.Finish(struct{}{})
		<-n.Context().Done()
	}()

	err = m.MarkStreamingHasEnabled(ctx)
	assert.NoError(t, err)

	n2 := syncutil.NewAsyncTaskNotifier[struct{}]()
	m.RegisterStreamingEnabledNotifier(n2)
	assert.Error(t, n.Context().Err())
	assert.Error(t, n2.Context().Err())
}

func TestChannelManagerWatch(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{
		Version: 1,
	}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Unset()
	catalog.EXPECT().ListPChannel(mock.Anything).RunAndReturn(func(ctx context.Context) ([]*streamingpb.PChannelMeta, error) {
		return []*streamingpb.PChannelMeta{
			{
				Channel: &streamingpb.PChannelInfo{
					Name: "test-channel",
					Term: 1,
				},
				Node: &streamingpb.StreamingNodeInfo{
					ServerId: 1,
				},
				State: streamingpb.PChannelMetaState_PCHANNEL_META_STATE_ASSIGNED,
			},
		}, nil
	})
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Return(nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)

	manager, err := RecoverChannelManager(context.Background())
	assert.NoError(t, err)
	done := make(chan struct{})
	ctx, cancel := context.WithCancel(context.Background())

	called := make(chan struct{}, 1)
	go func() {
		defer close(done)
		err := manager.WatchAssignmentResult(ctx, func(param WatchChannelAssignmentsCallbackParam) error {
			select {
			case called <- struct{}{}:
			default:
			}
			return nil
		})
		assert.ErrorIs(t, err, context.Canceled)
	}()

	manager.AssignPChannels(ctx, map[ChannelID]types.PChannelInfoAssigned{newChannelID("test-channel"): {
		Channel: types.PChannelInfo{
			Name:       "test-channel",
			Term:       1,
			AccessMode: types.AccessModeRW,
		},
		Node: types.StreamingNodeInfo{ServerID: 2},
	}})
	manager.AssignPChannelsDone(ctx, []ChannelID{newChannelID("test-channel")})

	<-called
	manager.MarkAsUnavailable(ctx, []types.PChannelInfo{{
		Name: "test-channel",
		Term: 2,
	}})
	<-called
	cancel()
	<-done
}

func TestChannelManager_AddPChannels(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{
		Version: 1,
	}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{
			Channel: &streamingpb.PChannelInfo{Name: "test-channel", Term: 1},
			Node:    &streamingpb.StreamingNodeInfo{ServerId: 1},
		},
	}, nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Return(nil)

	m, err := RecoverChannelManager(ctx, "test-channel")
	assert.NoError(t, err)
	assert.NotNil(t, m)

	// Initial state: 1 channel
	view := m.CurrentPChannelsView()
	assert.Len(t, view.Channels, 1)

	// Add new channels
	err = m.AddPChannels(ctx, []string{"new-channel-1", "new-channel-2"})
	assert.NoError(t, err)

	// Should now have 3 channels
	view = m.CurrentPChannelsView()
	assert.Len(t, view.Channels, 3)

	// Adding existing channels should be idempotent
	err = m.AddPChannels(ctx, []string{"test-channel", "new-channel-1"})
	assert.NoError(t, err)
	view = m.CurrentPChannelsView()
	assert.Len(t, view.Channels, 3) // No change

	// Adding a mix of existing and new
	err = m.AddPChannels(ctx, []string{"test-channel", "brand-new-channel"})
	assert.NoError(t, err)
	view = m.CurrentPChannelsView()
	assert.Len(t, view.Channels, 4)
}

func TestChannelManager_AddPChannels_ROWhenStreamingNotEnabled(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil)
	// streamingVersion is nil => streaming never enabled
	catalog.EXPECT().GetVersion(mock.Anything).Return(nil, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return(nil, nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Return(nil)

	m, err := RecoverChannelManager(ctx, "test-channel")
	assert.NoError(t, err)

	err = m.AddPChannels(ctx, []string{"new-ro-channel"})
	assert.NoError(t, err)

	view := m.CurrentPChannelsView()
	ch, ok := view.Channels[ChannelID{Name: "new-ro-channel"}]
	assert.True(t, ok)
	assert.Equal(t, types.AccessModeRO, ch.ChannelInfo().AccessMode)
}

func TestChannelManager_AddPChannels_PersistFailureRollback(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "test-channel",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{
		Version: 1,
	}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{
			Channel: &streamingpb.PChannelInfo{Name: "test-channel", Term: 1},
			Node:    &streamingpb.StreamingNodeInfo{ServerId: 1},
		},
	}, nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)

	persistErr := errors.New("persist failure")
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Return(persistErr)

	m, err := RecoverChannelManager(ctx, "test-channel")
	assert.NoError(t, err)

	// Attempt to add channels; persist fails
	err = m.AddPChannels(ctx, []string{"fail-channel-1", "fail-channel-2"})
	assert.ErrorIs(t, err, persistErr)

	// Channels should be rolled back — still only the original channel
	view := m.CurrentPChannelsView()
	assert.Len(t, view.Channels, 1)
	_, ok := view.Channels[ChannelID{Name: "test-channel"}]
	assert.True(t, ok)
	_, ok = view.Channels[ChannelID{Name: "fail-channel-1"}]
	assert.False(t, ok)
}

func TestAddPChannels_UnavailableInReplication(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{
		Pchannel: "ch1",
	}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{Version: 1}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{Channel: &streamingpb.PChannelInfo{Name: "ch1", Term: 1}, Node: &streamingpb.StreamingNodeInfo{ServerId: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch2", Term: 1}, Node: &streamingpb.StreamingNodeInfo{ServerId: 1}},
	}, nil)
	replicateCfg := &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch3", "ch4"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	}
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(
		&streamingpb.ReplicateConfigurationMeta{ReplicateConfiguration: replicateCfg}, nil)
	catalog.EXPECT().SavePChannels(mock.Anything, mock.Anything).Return(nil)

	m, err := RecoverChannelManager(ctx, "ch1", "ch2")
	assert.NoError(t, err)

	// ch1 and ch2 should be available (in replicateConfig)
	assert.True(t, m.channels[ChannelID{Name: "ch1"}].AvailableInReplication())
	assert.True(t, m.channels[ChannelID{Name: "ch2"}].AvailableInReplication())

	// Dynamically add ch5 — not in replicateConfig, should be unavailable
	err = m.AddPChannels(ctx, []string{"ch5"})
	assert.NoError(t, err)
	assert.False(t, m.channels[ChannelID{Name: "ch5"}].AvailableInReplication())
}

func TestRecovery_NoReplicateConfig_AllAvailable(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{Pchannel: "ch1"}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{Version: 1}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{Channel: &streamingpb.PChannelInfo{Name: "ch1", Term: 1}, Node: &streamingpb.StreamingNodeInfo{ServerId: 1}},
	}, nil)
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(nil, nil)

	m, err := RecoverChannelManager(ctx, "ch1")
	assert.NoError(t, err)
	assert.True(t, m.channels[ChannelID{Name: "ch1"}].AvailableInReplication())
}

func TestAllocVirtualChannels_SkipsUnavailableChannels(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{Pchannel: "ch1"}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{Version: 1}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{Channel: &streamingpb.PChannelInfo{Name: "ch1", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch2", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch3", Term: 1}},
	}, nil)
	replicateCfg := &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch4", "ch5"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	}
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(
		&streamingpb.ReplicateConfigurationMeta{ReplicateConfiguration: replicateCfg}, nil)

	m, err := RecoverChannelManager(ctx, "ch1", "ch2", "ch3")
	assert.NoError(t, err)

	// ch3 is unavailable — only ch1, ch2 are allocatable
	vchannels, err := m.AllocVirtualChannels(ctx, AllocVChannelParam{CollectionID: 1, Num: 2})
	assert.NoError(t, err)
	assert.Len(t, vchannels, 2)
	for _, vc := range vchannels {
		assert.False(t, strings.HasPrefix(vc, "ch3"))
	}

	// Requesting more than available channels should fail
	_, err = m.AllocVirtualChannels(ctx, AllocVChannelParam{CollectionID: 2, Num: 3})
	assert.Error(t, err)
}

func TestGetClusterChannels_ExcludesUnavailable(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{Pchannel: "ch1"}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{Version: 1}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{Channel: &streamingpb.PChannelInfo{Name: "ch1", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch2", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch3", Term: 1}},
	}, nil)
	replicateCfg := &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch4", "ch5"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	}
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(
		&streamingpb.ReplicateConfigurationMeta{ReplicateConfiguration: replicateCfg}, nil)

	m, err := RecoverChannelManager(ctx, "ch1", "ch2", "ch3")
	assert.NoError(t, err)

	// getClusterChannels should only return ch1, ch2
	cc := m.getClusterChannels()
	assert.Len(t, cc.Channels, 2)
	assert.ElementsMatch(t, []string{"ch1", "ch2"}, cc.Channels)

	// getClusterChannels with OptIncludeUnavailableInReplication should return all 3
	allCC := m.getClusterChannels(OptIncludeUnavailableInReplication())
	assert.Len(t, allCC.Channels, 3)
	assert.ElementsMatch(t, []string{"ch1", "ch2", "ch3"}, allCC.Channels)
}

func TestUpdateReplicateConfiguration_FlipsAvailability(t *testing.T) {
	ResetStaticPChannelStatsManager()
	RecoverPChannelStatsManager([]string{})

	catalog := mock_metastore.NewMockStreamingCoordCataLog(t)
	s := sessionutil.NewMockSession(t)
	s.EXPECT().GetRegisteredRevision().Return(int64(1))
	resource.InitForTest(resource.OptStreamingCatalog(catalog), resource.OptSession(s))

	ctx := context.Background()
	catalog.EXPECT().GetCChannel(mock.Anything).Return(&streamingpb.CChannelMeta{Pchannel: "ch1"}, nil)
	catalog.EXPECT().GetVersion(mock.Anything).Return(&streamingpb.StreamingVersion{Version: 1}, nil)
	catalog.EXPECT().ListPChannel(mock.Anything).Return([]*streamingpb.PChannelMeta{
		{Channel: &streamingpb.PChannelInfo{Name: "ch1", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch2", Term: 1}},
		{Channel: &streamingpb.PChannelInfo{Name: "ch3", Term: 1}},
	}, nil)
	// Initial config: only ch1, ch2 in current cluster
	replicateCfg := &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch4", "ch5"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	}
	catalog.EXPECT().GetReplicateConfiguration(mock.Anything).Return(
		&streamingpb.ReplicateConfigurationMeta{ReplicateConfiguration: replicateCfg}, nil)

	m, err := RecoverChannelManager(ctx, "ch1", "ch2", "ch3")
	assert.NoError(t, err)

	// ch3 should be unavailable initially
	assert.False(t, m.channels[ChannelID{Name: "ch3"}].AvailableInReplication())
	assert.True(t, m.channels[ChannelID{Name: "ch1"}].AvailableInReplication())
	assert.True(t, m.channels[ChannelID{Name: "ch2"}].AvailableInReplication())

	// Update config to include ch3
	newCfg := &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2", "ch3"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch4", "ch5", "ch6"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	}
	msg := message.NewAlterReplicateConfigMessageBuilderV2().
		WithHeader(&message.AlterReplicateConfigMessageHeader{ReplicateConfiguration: newCfg}).
		WithBody(&message.AlterReplicateConfigMessageBody{}).
		WithBroadcast([]string{"ch1", "ch2", "ch3"}).
		MustBuildBroadcast()
	result := message.BroadcastResultAlterReplicateConfigMessageV2{
		Message: message.MustAsBroadcastAlterReplicateConfigMessageV2(msg),
		Results: map[string]*message.AppendResult{
			"ch1": {MessageID: walimplstest.NewTestMessageID(1), LastConfirmedMessageID: walimplstest.NewTestMessageID(2), TimeTick: 1},
			"ch2": {MessageID: walimplstest.NewTestMessageID(3), LastConfirmedMessageID: walimplstest.NewTestMessageID(4), TimeTick: 1},
			"ch3": {MessageID: walimplstest.NewTestMessageID(5), LastConfirmedMessageID: walimplstest.NewTestMessageID(6), TimeTick: 1},
		},
	}
	catalog.EXPECT().SaveReplicateConfiguration(mock.Anything, mock.Anything, mock.Anything).Return(nil)

	err = m.UpdateReplicateConfiguration(ctx, result)
	assert.NoError(t, err)

	// ch3 should now be available
	assert.True(t, m.channels[ChannelID{Name: "ch3"}].AvailableInReplication())
	// ch1, ch2 still available
	assert.True(t, m.channels[ChannelID{Name: "ch1"}].AvailableInReplication())
	assert.True(t, m.channels[ChannelID{Name: "ch2"}].AvailableInReplication())
}

func TestIsChannelAvailableInReplication(t *testing.T) {
	// No replicateConfig → always available
	assert.True(t, isChannelAvailableInReplication("ch1", nil))

	// Single cluster (no cross-cluster topology) → always available
	singleCluster := replicateutil.MustNewConfigHelper("by-dev", &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
		},
	})
	assert.True(t, isChannelAvailableInReplication("ch1", singleCluster))
	assert.True(t, isChannelAvailableInReplication("ch99", singleCluster))

	// Multi-cluster: channel in current cluster's list → available
	multiCluster := replicateutil.MustNewConfigHelper("by-dev", &commonpb.ReplicateConfiguration{
		Clusters: []*commonpb.MilvusCluster{
			{ClusterId: "by-dev", Pchannels: []string{"ch1", "ch2"}},
			{ClusterId: "by-dev2", Pchannels: []string{"ch3", "ch4"}},
		},
		CrossClusterTopology: []*commonpb.CrossClusterTopology{
			{SourceClusterId: "by-dev", TargetClusterId: "by-dev2"},
		},
	})
	assert.True(t, isChannelAvailableInReplication("ch1", multiCluster))
	assert.True(t, isChannelAvailableInReplication("ch2", multiCluster))

	// Multi-cluster: channel NOT in current cluster's list → unavailable
	assert.False(t, isChannelAvailableInReplication("ch5", multiCluster))
	assert.False(t, isChannelAvailableInReplication("new-channel", multiCluster))
}

func newChannelID(name string) ChannelID {
	return ChannelID{
		Name: name,
	}
}
