// 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 checkers

import (
	"context"
	"testing"

	"github.com/cockroachdb/errors"
	"github.com/stretchr/testify/mock"
	"github.com/stretchr/testify/suite"

	etcdkv "github.com/milvus-io/milvus/internal/kv/etcd"
	"github.com/milvus-io/milvus/internal/metastore/kv/querycoord"
	"github.com/milvus-io/milvus/internal/proto/datapb"
	"github.com/milvus-io/milvus/internal/proto/indexpb"
	"github.com/milvus-io/milvus/internal/proto/querypb"
	"github.com/milvus-io/milvus/internal/querycoordv2/meta"
	"github.com/milvus-io/milvus/internal/querycoordv2/params"
	"github.com/milvus-io/milvus/internal/querycoordv2/session"
	"github.com/milvus-io/milvus/internal/querycoordv2/task"
	"github.com/milvus-io/milvus/internal/querycoordv2/utils"
	"github.com/milvus-io/milvus/pkg/kv"
	"github.com/milvus-io/milvus/pkg/util/etcd"
	"github.com/milvus-io/milvus/pkg/util/paramtable"
)

type IndexCheckerSuite struct {
	suite.Suite
	kv        kv.MetaKv
	checker   *IndexChecker
	meta      *meta.Meta
	broker    *meta.MockBroker
	nodeMgr   *session.NodeManager
	targetMgr *meta.MockTargetManager
}

func (suite *IndexCheckerSuite) SetupSuite() {
	paramtable.Init()
}

func (suite *IndexCheckerSuite) SetupTest() {
	var err error
	config := params.GenerateEtcdConfig()
	cli, err := etcd.GetEtcdClient(
		config.UseEmbedEtcd.GetAsBool(),
		config.EtcdUseSSL.GetAsBool(),
		config.Endpoints.GetAsStrings(),
		config.EtcdTLSCert.GetValue(),
		config.EtcdTLSKey.GetValue(),
		config.EtcdTLSCACert.GetValue(),
		config.EtcdTLSMinVersion.GetValue())
	suite.Require().NoError(err)
	suite.kv = etcdkv.NewEtcdKV(cli, config.MetaRootPath.GetValue())

	// meta
	store := querycoord.NewCatalog(suite.kv)
	idAllocator := params.RandomIncrementIDAllocator()
	suite.nodeMgr = session.NewNodeManager()
	suite.meta = meta.NewMeta(idAllocator, store, suite.nodeMgr)
	distManager := meta.NewDistributionManager()
	suite.broker = meta.NewMockBroker(suite.T())

	suite.targetMgr = meta.NewMockTargetManager(suite.T())
	suite.checker = NewIndexChecker(suite.meta, distManager, suite.broker, suite.nodeMgr, suite.targetMgr)

	suite.targetMgr.EXPECT().GetSealedSegment(mock.Anything, mock.Anything, mock.Anything).RunAndReturn(func(cid, sid int64, i3 int32) *datapb.SegmentInfo {
		return &datapb.SegmentInfo{
			ID:    sid,
			Level: datapb.SegmentLevel_L1,
		}
	}).Maybe()
}

func (suite *IndexCheckerSuite) TearDownTest() {
	suite.kv.Close()
}

func (suite *IndexCheckerSuite) TestLoadIndex() {
	checker := suite.checker

	// meta
	coll := utils.CreateTestCollection(1, 1)
	coll.FieldIndexID = map[int64]int64{101: 1000}
	checker.meta.CollectionManager.PutCollection(coll)
	checker.meta.ReplicaManager.Put(utils.CreateTestReplica(200, 1, []int64{1, 2}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   1,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   2,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	checker.meta.ResourceManager.HandleNodeUp(1)
	checker.meta.ResourceManager.HandleNodeUp(2)

	// dist
	checker.dist.SegmentDistManager.Update(1, utils.CreateTestSegment(1, 1, 2, 1, 1, "test-insert-channel"))

	// broker
	suite.broker.EXPECT().GetIndexInfo(mock.Anything, int64(1), int64(2)).
		Return([]*querypb.FieldIndexInfo{
			{
				FieldID:        101,
				IndexID:        1000,
				EnableIndex:    true,
				IndexFilePaths: []string{"index"},
			},
		}, nil)

	suite.broker.EXPECT().ListIndexes(mock.Anything, int64(1)).Return([]*indexpb.IndexInfo{
		{
			FieldID: 101,
			IndexID: 1000,
		},
	}, nil)

	tasks := checker.Check(context.Background())
	suite.Require().Len(tasks, 1)

	t := tasks[0]
	suite.Require().Len(t.Actions(), 1)

	action, ok := t.Actions()[0].(*task.SegmentAction)
	suite.Require().True(ok)
	suite.EqualValues(200, t.ReplicaID())
	suite.Equal(task.ActionTypeUpdate, action.Type())
	suite.EqualValues(2, action.GetSegmentID())

	// test skip load index for read only node
	suite.nodeMgr.Stopping(1)
	suite.nodeMgr.Stopping(2)
	suite.meta.ResourceManager.HandleNodeStopping(1)
	suite.meta.ResourceManager.HandleNodeStopping(2)
	utils.RecoverAllCollection(suite.meta)
	tasks = checker.Check(context.Background())
	suite.Require().Len(tasks, 0)
}

func (suite *IndexCheckerSuite) TestIndexInfoNotMatch() {
	checker := suite.checker

	// meta
	coll := utils.CreateTestCollection(1, 1)
	coll.FieldIndexID = map[int64]int64{101: 1000}
	checker.meta.CollectionManager.PutCollection(coll)
	checker.meta.ReplicaManager.Put(utils.CreateTestReplica(200, 1, []int64{1, 2}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   1,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   2,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	checker.meta.ResourceManager.HandleNodeUp(1)
	checker.meta.ResourceManager.HandleNodeUp(2)

	// dist
	checker.dist.SegmentDistManager.Update(1, utils.CreateTestSegment(1, 1, 2, 1, 1, "test-insert-channel"))
	checker.dist.SegmentDistManager.Update(1, utils.CreateTestSegment(1, 1, 3, 1, 1, "test-insert-channel"))

	// broker
	suite.broker.EXPECT().GetIndexInfo(mock.Anything, int64(1), mock.AnythingOfType("int64")).Call.
		Return(func(ctx context.Context, collectionID, segmentID int64) []*querypb.FieldIndexInfo {
			if segmentID == 2 {
				return []*querypb.FieldIndexInfo{
					{
						FieldID:     101,
						IndexID:     1000,
						EnableIndex: false,
					},
				}
			}
			if segmentID == 3 {
				return []*querypb.FieldIndexInfo{
					{
						FieldID:     101,
						IndexID:     1002,
						EnableIndex: false,
					},
				}
			}
			return nil
		}, nil)

	suite.broker.EXPECT().ListIndexes(mock.Anything, int64(1)).Return([]*indexpb.IndexInfo{
		{
			FieldID: 101,
			IndexID: 1000,
		},
	}, nil)

	tasks := checker.Check(context.Background())
	suite.Require().Len(tasks, 0)
}

func (suite *IndexCheckerSuite) TestGetIndexInfoFailed() {
	checker := suite.checker

	// meta
	coll := utils.CreateTestCollection(1, 1)
	coll.FieldIndexID = map[int64]int64{101: 1000}
	checker.meta.CollectionManager.PutCollection(coll)
	checker.meta.ReplicaManager.Put(utils.CreateTestReplica(200, 1, []int64{1, 2}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   1,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   2,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	checker.meta.ResourceManager.HandleNodeUp(1)
	checker.meta.ResourceManager.HandleNodeUp(2)

	// dist
	checker.dist.SegmentDistManager.Update(1, utils.CreateTestSegment(1, 1, 2, 1, 1, "test-insert-channel"))
	checker.dist.SegmentDistManager.Update(1, utils.CreateTestSegment(1, 1, 3, 1, 1, "test-insert-channel"))

	// broker
	suite.broker.EXPECT().GetIndexInfo(mock.Anything, int64(1), mock.AnythingOfType("int64")).
		Return(nil, errors.New("mocked error"))
	suite.broker.EXPECT().ListIndexes(mock.Anything, int64(1)).Return([]*indexpb.IndexInfo{
		{
			FieldID: 101,
			IndexID: 1000,
		},
	}, nil)

	tasks := checker.Check(context.Background())
	suite.Require().Len(tasks, 0)
}

func (suite *IndexCheckerSuite) TestCreateNewIndex() {
	checker := suite.checker

	// meta
	coll := utils.CreateTestCollection(1, 1)
	coll.FieldIndexID = map[int64]int64{101: 1000}
	checker.meta.CollectionManager.PutCollection(coll)
	checker.meta.ReplicaManager.Put(utils.CreateTestReplica(200, 1, []int64{1, 2}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   1,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	suite.nodeMgr.Add(session.NewNodeInfo(session.ImmutableNodeInfo{
		NodeID:   2,
		Address:  "localhost",
		Hostname: "localhost",
	}))
	checker.meta.ResourceManager.HandleNodeUp(1)
	checker.meta.ResourceManager.HandleNodeUp(2)

	// dist
	segment := utils.CreateTestSegment(1, 1, 2, 1, 1, "test-insert-channel")
	segment.IndexInfo = map[int64]*querypb.FieldIndexInfo{101: {
		FieldID:     101,
		IndexID:     1000,
		EnableIndex: true,
	}}
	checker.dist.SegmentDistManager.Update(1, segment)

	// broker
	suite.broker.EXPECT().ListIndexes(mock.Anything, mock.Anything).Call.Return(
		func(ctx context.Context, collectionID int64) ([]*indexpb.IndexInfo, error) {
			return []*indexpb.IndexInfo{
				{
					FieldID: 101,
					IndexID: 1000,
				},
				{
					FieldID: 102,
					IndexID: 1001,
				},
			}, nil
		},
	)
	suite.broker.EXPECT().GetIndexInfo(mock.Anything, mock.Anything, mock.AnythingOfType("int64")).Call.
		Return(func(ctx context.Context, collectionID, segmentID int64) []*querypb.FieldIndexInfo {
			return []*querypb.FieldIndexInfo{
				{
					FieldID:        101,
					IndexID:        1000,
					EnableIndex:    true,
					IndexFilePaths: []string{"index"},
				},
				{
					FieldID:        102,
					IndexID:        1001,
					EnableIndex:    true,
					IndexFilePaths: []string{"index"},
				},
			}
		}, nil)

	tasks := checker.Check(context.Background())
	suite.Len(tasks, 1)
	suite.Len(tasks[0].Actions(), 1)
	suite.Equal(tasks[0].Actions()[0].(*task.SegmentAction).Type(), task.ActionTypeUpdate)
}

func TestIndexChecker(t *testing.T) {
	suite.Run(t, new(IndexCheckerSuite))
}