// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 querynode

import (
	"context"
	"encoding/binary"
	"math"
	"testing"

	"github.com/golang/protobuf/proto"
	"github.com/stretchr/testify/assert"

	"github.com/milvus-io/milvus/internal/proto/milvuspb"
	"github.com/milvus-io/milvus/internal/proto/planpb"
)

func TestPlan_Plan(t *testing.T) {
	collectionID := UniqueID(0)
	collectionMeta := genTestCollectionMeta(collectionID, false)

	collection := newCollection(collectionMeta.ID, collectionMeta.Schema)

	dslString := "{\"bool\": { \n\"vector\": {\n \"vec\": {\n \"metric_type\": \"L2\", \n \"params\": {\n \"nprobe\": 10 \n},\n \"query\": \"$0\",\n \"topk\": 10 \n,\"round_decimal\": 6\n } \n } \n } \n }"

	plan, err := createSearchPlan(collection, dslString)
	assert.NoError(t, err)
	assert.NotEqual(t, plan, nil)
	topk := plan.getTopK()
	assert.Equal(t, int(topk), 10)
	metricType := plan.getMetricType()
	assert.Equal(t, metricType, "L2")
	plan.delete()
	deleteCollection(collection)
}

func TestPlan_createSearchPlanByExpr(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	historical, err := genSimpleHistorical(ctx)
	assert.NoError(t, err)

	col, err := historical.replica.getCollectionByID(defaultCollectionID)
	assert.NoError(t, err)

	planNode := &planpb.PlanNode{
		OutputFieldIds: []FieldID{rowIDFieldID},
	}
	expr, err := proto.Marshal(planNode)
	assert.NoError(t, err)

	_, err = createSearchPlanByExpr(col, expr)
	assert.Error(t, err)
}

func TestPlan_NilCollection(t *testing.T) {
	collection := &Collection{
		id: defaultCollectionID,
	}

	_, err := createSearchPlan(collection, "")
	assert.Error(t, err)

	_, err = createSearchPlanByExpr(collection, nil)
	assert.Error(t, err)
}

func TestPlan_PlaceholderGroup(t *testing.T) {
	collectionID := UniqueID(0)
	collectionMeta := genTestCollectionMeta(collectionID, false)

	collection := newCollection(collectionMeta.ID, collectionMeta.Schema)

	dslString := "{\"bool\": { \n\"vector\": {\n \"vec\": {\n \"metric_type\": \"L2\", \n \"params\": {\n \"nprobe\": 10 \n},\n \"query\": \"$0\",\n \"topk\": 10 \n,\"round_decimal\": 6\n } \n } \n } \n }"
	plan, err := createSearchPlan(collection, dslString)
	assert.NoError(t, err)
	assert.NotNil(t, plan)

	var searchRawData1 []byte
	var searchRawData2 []byte
	const DIM = 16
	var vec = [DIM]float32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
	for i, ele := range vec {
		buf := make([]byte, 4)
		binary.LittleEndian.PutUint32(buf, math.Float32bits(ele+float32(i*2)))
		searchRawData1 = append(searchRawData1, buf...)
	}
	for i, ele := range vec {
		buf := make([]byte, 4)
		binary.LittleEndian.PutUint32(buf, math.Float32bits(ele+float32(i*4)))
		searchRawData2 = append(searchRawData2, buf...)
	}
	placeholderValue := milvuspb.PlaceholderValue{
		Tag:    "$0",
		Type:   milvuspb.PlaceholderType_FloatVector,
		Values: [][]byte{searchRawData1, searchRawData2},
	}

	placeholderGroup := milvuspb.PlaceholderGroup{
		Placeholders: []*milvuspb.PlaceholderValue{&placeholderValue},
	}

	placeGroupByte, err := proto.Marshal(&placeholderGroup)
	assert.Nil(t, err)
	holder, err := parseSearchRequest(plan, placeGroupByte)
	assert.NoError(t, err)
	assert.NotNil(t, holder)
	numQueries := holder.getNumOfQuery()
	assert.Equal(t, int(numQueries), 2)

	plan.delete()
	holder.delete()
	deleteCollection(collection)
}