// 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 metacache

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"

	"github.com/milvus-io/milvus/internal/flushcommon/metacache/pkoracle"
	"github.com/milvus-io/milvus/internal/storage"
	"github.com/milvus-io/milvus/pkg/v3/proto/datapb"
)

type SegmentSuite struct {
	suite.Suite

	info *datapb.SegmentInfo
}

func (s *SegmentSuite) TestBasic() {
	bfs := pkoracle.NewBloomFilterSet()
	stats := NewEmptySegmentBM25Stats()
	segment := NewSegmentInfo(s.info, bfs, stats, NewEmptySegmentStats())
	s.Equal(s.info.GetID(), segment.SegmentID())
	s.Equal(s.info.GetPartitionID(), segment.PartitionID())
	s.Equal(s.info.GetNumOfRows(), segment.NumOfRows())
	s.Equal(s.info.GetStartPosition(), segment.StartPosition())
	s.Equal(s.info.GetDmlPosition(), segment.Checkpoint())
	s.Equal(bfs.GetHistory(), segment.GetHistory())
	s.True(segment.startPosRecorded)
}

func (s *SegmentSuite) TestClone() {
	bfs := pkoracle.NewBloomFilterSet()
	stats := NewEmptySegmentBM25Stats()
	segment := NewSegmentInfo(s.info, bfs, stats, NewEmptySegmentStats())
	cloned := segment.Clone()
	s.Equal(segment.SegmentID(), cloned.SegmentID())
	s.Equal(segment.PartitionID(), cloned.PartitionID())
	s.Equal(segment.NumOfRows(), cloned.NumOfRows())
	s.Equal(segment.StartPosition(), cloned.StartPosition())
	s.Equal(segment.Checkpoint(), cloned.Checkpoint())
	s.Equal(segment.GetHistory(), cloned.GetHistory())
	s.Equal(segment.startPosRecorded, cloned.startPosRecorded)
	s.Equal(segment.Binlogs(), cloned.Binlogs())
	s.Equal(segment.Statslogs(), cloned.Statslogs())
	s.Equal(segment.Deltalogs(), cloned.Deltalogs())
	s.Equal(segment.Bm25logs(), cloned.Bm25logs())
	s.Equal(segment.GetBM25Stats(), cloned.GetBM25Stats())
}

func (s *SegmentSuite) TestRecoverCurrentSplitFormat() {
	info := &datapb.SegmentInfo{
		ID:             10,
		StorageVersion: storage.StorageV3,
		Binlogs: []*datapb.FieldBinlog{
			{
				FieldID:     100,
				ChildFields: []int64{100, 101},
				Format:      "parquet",
			},
			{
				FieldID:     102,
				ChildFields: []int64{102},
				Format:      "vortex",
			},
		},
	}

	segment := NewSegmentInfo(info, pkoracle.NewBloomFilterSet(), nil, NewEmptySegmentStats())

	s.Equal("parquet", segment.GetCurrentSplit()[0].Format)
	s.Equal("vortex", segment.GetCurrentSplit()[1].Format)
}

func TestSegment(t *testing.T) {
	suite.Run(t, new(SegmentSuite))
}

func TestSegmentInfo_StatsCarriedByRefThroughClone(t *testing.T) {
	insertBinlog := func(memSize int64, tsTo uint64) map[int64]*datapb.FieldBinlog {
		return map[int64]*datapb.FieldBinlog{
			1: {FieldID: 1, Binlogs: []*datapb.Binlog{{MemorySize: memSize, EntriesNum: 10, TimestampTo: tsTo}}},
		}
	}
	si := NewSegmentInfo(&datapb.SegmentInfo{ID: 1}, nil, nil, NewEmptySegmentStats())
	si.Statistics().Digest(insertBinlog(100, 5), nil, 0, 10, 1, 5)
	cloned := si.Clone()
	// shared by pointer: digesting through the clone is visible on the original
	cloned.Statistics().Digest(insertBinlog(100, 9), nil, 0, 10, 6, 9)
	// SegmentInfo.Clone shares the *SegmentStats by pointer, so the original
	// and the clone are the same accumulator.
	assert.Same(t, si.Statistics(), cloned.Statistics())
	// And the original sees the clone's digest: cumulative 100+100 = 200.
	assert.Equal(t, int64(200), si.Statistics().Publish().GetInsertBinlogSize())
}
