// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 querynodev2

import (
	"context"
	"os"
	"testing"

	"github.com/golang/protobuf/proto"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/suite"
	clientv3 "go.etcd.io/etcd/client/v3"

	"github.com/milvus-io/milvus/internal/proto/datapb"
	"github.com/milvus-io/milvus/internal/proto/internalpb"
	"github.com/milvus-io/milvus/internal/proto/planpb"
	"github.com/milvus-io/milvus/internal/proto/querypb"
	"github.com/milvus-io/milvus/internal/querynodev2/delegator"
	"github.com/milvus-io/milvus/internal/storage"
	"github.com/milvus-io/milvus/internal/util/dependency"
	"github.com/milvus-io/milvus/pkg/common"
	"github.com/milvus-io/milvus/pkg/util/etcd"
	"github.com/milvus-io/milvus/pkg/util/merr"
	"github.com/milvus-io/milvus/pkg/util/paramtable"
)

type HandlersSuite struct {
	suite.Suite
	// Data
	collectionID   int64
	collectionName string
	segmentID      int64
	channel        string

	// Dependency
	params              *paramtable.ComponentParam
	node                *QueryNode
	etcd                *clientv3.Client
	chunkManagerFactory *storage.ChunkManagerFactory

	// Mock
	factory *dependency.MockFactory
}

func (suite *HandlersSuite) SetupSuite() {
	suite.collectionID = 111
	suite.collectionName = "test-collection"
	suite.segmentID = 1
	suite.channel = "test-channel"
}

func (suite *HandlersSuite) SetupTest() {
	var err error
	paramtable.Init()
	suite.params = paramtable.Get()
	suite.params.Save(suite.params.QueryNodeCfg.GCEnabled.Key, "false")

	// mock factory
	suite.factory = dependency.NewMockFactory(suite.T())
	suite.chunkManagerFactory = storage.NewChunkManagerFactory("local", storage.RootPath("/tmp/milvus_test"))

	// new node
	suite.node = NewQueryNode(context.Background(), suite.factory)
	// init etcd
	suite.etcd, err = etcd.GetEtcdClient(
		suite.params.EtcdCfg.UseEmbedEtcd.GetAsBool(),
		suite.params.EtcdCfg.EtcdUseSSL.GetAsBool(),
		suite.params.EtcdCfg.Endpoints.GetAsStrings(),
		suite.params.EtcdCfg.EtcdTLSCert.GetValue(),
		suite.params.EtcdCfg.EtcdTLSKey.GetValue(),
		suite.params.EtcdCfg.EtcdTLSCACert.GetValue(),
		suite.params.EtcdCfg.EtcdTLSMinVersion.GetValue())
	suite.NoError(err)
}

func (suite *HandlersSuite) TearDownTest() {
	suite.etcd.Close()
	os.RemoveAll("/tmp/milvus-test")
}

func (suite *HandlersSuite) TestLoadGrowingSegments() {
	ctx := context.Background()
	var err error
	// mock
	loadSegmetns := []int64{}
	delegator := delegator.NewMockShardDelegator(suite.T())
	delegator.EXPECT().LoadGrowing(mock.Anything, mock.Anything, mock.Anything).Run(func(ctx context.Context, infos []*querypb.SegmentLoadInfo, version int64) {
		for _, info := range infos {
			loadSegmetns = append(loadSegmetns, info.SegmentID)
		}
	}).Return(nil)

	req := &querypb.WatchDmChannelsRequest{
		Infos: []*datapb.VchannelInfo{
			{
				CollectionID:        suite.collectionID,
				ChannelName:         suite.channel,
				UnflushedSegmentIds: []int64{suite.segmentID},
			},
		},
		SegmentInfos: make(map[int64]*datapb.SegmentInfo),
	}

	// unflushed segment not in segmentInfos, will skip
	err = loadGrowingSegments(ctx, delegator, req)
	suite.NoError(err)
	suite.Equal(0, len(loadSegmetns))

	// binlog was empty, will skip
	req.SegmentInfos[suite.segmentID] = &datapb.SegmentInfo{
		ID:           suite.segmentID,
		CollectionID: suite.collectionID,
		Binlogs:      make([]*datapb.FieldBinlog, 0),
	}
	err = loadGrowingSegments(ctx, delegator, req)
	suite.NoError(err)
	suite.Equal(0, len(loadSegmetns))

	// normal load
	binlog := &datapb.FieldBinlog{}
	req.SegmentInfos[suite.segmentID].Binlogs = append(req.SegmentInfos[suite.segmentID].Binlogs, binlog)
	err = loadGrowingSegments(ctx, delegator, req)
	suite.NoError(err)
	suite.Equal(1, len(loadSegmetns))
}

func TestHandlersSuite(t *testing.T) {
	suite.Run(t, new(HandlersSuite))
}

type OptimizeSearchParamSuite struct {
	suite.Suite
	// Data
	collectionID   int64
	collectionName string
	segmentID      int64
	channel        string

	node      *QueryNode
	delegator *delegator.MockShardDelegator
	// Mock
	factory *dependency.MockFactory
}

func (suite *OptimizeSearchParamSuite) SetupSuite() {
	suite.collectionID = 111
	suite.collectionName = "test-collection"
	suite.segmentID = 1
	suite.channel = "test-channel"

	suite.delegator = &delegator.MockShardDelegator{}
	suite.delegator.EXPECT().GetSegmentInfo().Return([]delegator.SnapshotItem{{NodeID: 1, Segments: []delegator.SegmentEntry{{SegmentID: 100}}}}, []delegator.SegmentEntry{})
}

func (suite *OptimizeSearchParamSuite) SetupTest() {
	suite.factory = dependency.NewMockFactory(suite.T())
	suite.node = NewQueryNode(context.Background(), suite.factory)
}

func (suite *OptimizeSearchParamSuite) TearDownTest() {
}

func (suite *OptimizeSearchParamSuite) TestOptimizeSearchParam() {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	suite.Run("normal_run", func() {
		mockHook := &MockQueryHook{}
		mockHook.EXPECT().Run(mock.Anything).Run(func(params map[string]any) {
			params[common.TopKKey] = int64(50)
			params[common.SearchParamKey] = `{"param": 2}`
		}).Return(nil)
		suite.node.queryHook = mockHook
		defer func() { suite.node.queryHook = nil }()

		plan := &planpb.PlanNode{
			Node: &planpb.PlanNode_VectorAnns{
				VectorAnns: &planpb.VectorANNS{
					QueryInfo: &planpb.QueryInfo{
						Topk:         100,
						SearchParams: `{"param": 1}`,
					},
				},
			},
		}
		bs, err := proto.Marshal(plan)
		suite.Require().NoError(err)

		req, err := suite.node.optimizeSearchParams(ctx, &querypb.SearchRequest{
			Req: &internalpb.SearchRequest{
				SerializedExprPlan: bs,
			},
			TotalChannelNum: 2,
		}, suite.delegator)
		suite.NoError(err)
		suite.verifyQueryInfo(req, 50, `{"param": 2}`)
	})

	suite.Run("no_hook", func() {
		suite.node.queryHook = nil
		plan := &planpb.PlanNode{
			Node: &planpb.PlanNode_VectorAnns{
				VectorAnns: &planpb.VectorANNS{
					QueryInfo: &planpb.QueryInfo{
						Topk:         100,
						SearchParams: `{"param": 1}`,
					},
				},
			},
		}
		bs, err := proto.Marshal(plan)
		suite.Require().NoError(err)

		req, err := suite.node.optimizeSearchParams(ctx, &querypb.SearchRequest{
			Req: &internalpb.SearchRequest{
				SerializedExprPlan: bs,
			},
			TotalChannelNum: 2,
		}, suite.delegator)
		suite.NoError(err)
		suite.verifyQueryInfo(req, 100, `{"param": 1}`)
	})

	suite.Run("other_plannode", func() {
		mockHook := &MockQueryHook{}
		mockHook.EXPECT().Run(mock.Anything).Run(func(params map[string]any) {
			params[common.TopKKey] = int64(50)
			params[common.SearchParamKey] = `{"param": 2}`
		}).Return(nil).Maybe()
		suite.node.queryHook = mockHook
		defer func() { suite.node.queryHook = nil }()

		plan := &planpb.PlanNode{
			Node: &planpb.PlanNode_Query{},
		}
		bs, err := proto.Marshal(plan)
		suite.Require().NoError(err)

		req, err := suite.node.optimizeSearchParams(ctx, &querypb.SearchRequest{
			Req: &internalpb.SearchRequest{
				SerializedExprPlan: bs,
			},
			TotalChannelNum: 2,
		}, suite.delegator)
		suite.NoError(err)
		suite.Equal(bs, req.GetReq().GetSerializedExprPlan())
	})

	suite.Run("no_serialized_plan", func() {
		mockHook := &MockQueryHook{}
		mockHook.EXPECT().Run(mock.Anything).Run(func(params map[string]any) {
			params[common.TopKKey] = int64(50)
			params[common.SearchParamKey] = `{"param": 2}`
		}).Return(nil)
		suite.node.queryHook = mockHook
		defer func() { suite.node.queryHook = nil }()

		_, err := suite.node.optimizeSearchParams(ctx, &querypb.SearchRequest{
			Req:             &internalpb.SearchRequest{},
			TotalChannelNum: 2,
		}, suite.delegator)
		suite.Error(err)
	})

	suite.Run("hook_run_error", func() {
		mockHook := &MockQueryHook{}
		mockHook.EXPECT().Run(mock.Anything).Run(func(params map[string]any) {
			params[common.TopKKey] = int64(50)
			params[common.SearchParamKey] = `{"param": 2}`
		}).Return(merr.WrapErrServiceInternal("mocked"))
		suite.node.queryHook = mockHook
		defer func() { suite.node.queryHook = nil }()

		plan := &planpb.PlanNode{
			Node: &planpb.PlanNode_VectorAnns{
				VectorAnns: &planpb.VectorANNS{
					QueryInfo: &planpb.QueryInfo{
						Topk:         100,
						SearchParams: `{"param": 1}`,
					},
				},
			},
		}
		bs, err := proto.Marshal(plan)
		suite.Require().NoError(err)

		_, err = suite.node.optimizeSearchParams(ctx, &querypb.SearchRequest{
			Req: &internalpb.SearchRequest{
				SerializedExprPlan: bs,
			},
		}, suite.delegator)
		suite.Error(err)
	})
}

func (suite *OptimizeSearchParamSuite) verifyQueryInfo(req *querypb.SearchRequest, topK int64, param string) {
	planBytes := req.GetReq().GetSerializedExprPlan()

	plan := planpb.PlanNode{}
	err := proto.Unmarshal(planBytes, &plan)
	suite.Require().NoError(err)

	queryInfo := plan.GetVectorAnns().GetQueryInfo()
	suite.Equal(topK, queryInfo.GetTopk())
	suite.Equal(param, queryInfo.GetSearchParams())
}

func TestOptimizeSearchParam(t *testing.T) {
	suite.Run(t, new(OptimizeSearchParamSuite))
}