// 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 proxy

import (
	"context"
	"strconv"
	"testing"
	"time"

	"github.com/milvus-io/milvus/internal/proto/schemapb"

	"github.com/milvus-io/milvus/internal/proto/commonpb"

	"github.com/milvus-io/milvus/internal/util/uniquegenerator"

	"github.com/stretchr/testify/assert"

	"github.com/golang/protobuf/proto"

	"github.com/milvus-io/milvus/internal/util/funcutil"

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

func TestCreateCollectionTask(t *testing.T) {
	Params.Init()

	rc := NewRootCoordMock()
	ctx := context.Background()
	shardsNum := int32(2)
	prefix := "TestCreateCollectionTask"
	dbName := ""
	collectionName := prefix + funcutil.GenRandomStr()
	int64Field := "int64"
	floatVecField := "fvec"
	dim := 128

	schema := constructCollectionSchema(int64Field, floatVecField, dim, collectionName)
	var marshaledSchema []byte
	marshaledSchema, err := proto.Marshal(schema)
	assert.NoError(t, err)

	task := &createCollectionTask{
		Condition: NewTaskCondition(ctx),
		CreateCollectionRequest: &milvuspb.CreateCollectionRequest{
			Base:           nil,
			DbName:         dbName,
			CollectionName: collectionName,
			Schema:         marshaledSchema,
			ShardsNum:      shardsNum,
		},
		ctx:       ctx,
		rootCoord: rc,
		result:    nil,
		schema:    nil,
	}

	t.Run("on enqueue", func(t *testing.T) {
		err := task.OnEnqueue()
		assert.NoError(t, err)
		assert.Equal(t, commonpb.MsgType_CreateCollection, task.Type())
	})

	t.Run("ctx", func(t *testing.T) {
		traceCtx := task.TraceCtx()
		assert.NotNil(t, traceCtx)
	})

	t.Run("id", func(t *testing.T) {
		id := UniqueID(uniquegenerator.GetUniqueIntGeneratorIns().GetInt())
		task.SetID(id)
		assert.Equal(t, id, task.ID())
	})

	t.Run("name", func(t *testing.T) {
		assert.Equal(t, CreateCollectionTaskName, task.Name())
	})

	t.Run("ts", func(t *testing.T) {
		ts := Timestamp(time.Now().UnixNano())
		task.SetTs(ts)
		assert.Equal(t, ts, task.BeginTs())
		assert.Equal(t, ts, task.EndTs())
	})

	t.Run("process task", func(t *testing.T) {
		var err error

		err = task.PreExecute(ctx)
		assert.NoError(t, err)

		err = task.Execute(ctx)
		assert.NoError(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, task.result.ErrorCode)

		// recreate -> fail
		err = task.Execute(ctx)
		assert.NoError(t, err)
		assert.NotEqual(t, commonpb.ErrorCode_Success, task.result.ErrorCode)

		err = task.PostExecute(ctx)
		assert.NoError(t, err)
	})

	t.Run("PreExecute", func(t *testing.T) {
		var err error

		err = task.PreExecute(ctx)
		assert.NoError(t, err)

		task.Schema = []byte{0x1, 0x2, 0x3, 0x4}
		err = task.PreExecute(ctx)
		assert.Error(t, err)
		task.Schema = marshaledSchema

		task.ShardsNum = Params.MaxShardNum + 1
		err = task.PreExecute(ctx)
		assert.Error(t, err)
		task.ShardsNum = shardsNum

		reqBackup := proto.Clone(task.CreateCollectionRequest).(*milvuspb.CreateCollectionRequest)
		schemaBackup := proto.Clone(schema).(*schemapb.CollectionSchema)

		schemaWithTooManyFields := &schemapb.CollectionSchema{
			Name:        collectionName,
			Description: "",
			AutoID:      false,
			Fields:      make([]*schemapb.FieldSchema, Params.MaxFieldNum+1),
		}
		marshaledSchemaWithTooManyFields, err := proto.Marshal(schemaWithTooManyFields)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = marshaledSchemaWithTooManyFields
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		task.CreateCollectionRequest = reqBackup

		// ValidateCollectionName

		schema.Name = " " // empty
		emptyNameSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = emptyNameSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		schema.Name = prefix
		for i := 0; i < int(Params.MaxNameLength); i++ {
			schema.Name += strconv.Itoa(i % 10)
		}
		tooLongNameSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = tooLongNameSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		schema.Name = "$" // invalid first char
		invalidFirstCharSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = invalidFirstCharSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		// ValidateDuplicatedFieldName
		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		schema.Fields = append(schema.Fields, schema.Fields[0])
		duplicatedFieldsSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = duplicatedFieldsSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		// ValidatePrimaryKey
		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		for idx := range schema.Fields {
			schema.Fields[idx].IsPrimaryKey = false
		}
		noPrimaryFieldsSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = noPrimaryFieldsSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		// ValidateFieldName
		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		for idx := range schema.Fields {
			schema.Fields[idx].Name = "$"
		}
		invalidFieldNameSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = invalidFieldNameSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		// ValidateVectorField
		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		for idx := range schema.Fields {
			if schema.Fields[idx].DataType == schemapb.DataType_FloatVector ||
				schema.Fields[idx].DataType == schemapb.DataType_BinaryVector {
				schema.Fields[idx].TypeParams = nil
			}
		}
		noDimSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = noDimSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		for idx := range schema.Fields {
			if schema.Fields[idx].DataType == schemapb.DataType_FloatVector ||
				schema.Fields[idx].DataType == schemapb.DataType_BinaryVector {
				schema.Fields[idx].TypeParams = []*commonpb.KeyValuePair{
					{
						Key:   "dim",
						Value: "not int",
					},
				}
			}
		}
		dimNotIntSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = dimNotIntSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		for idx := range schema.Fields {
			if schema.Fields[idx].DataType == schemapb.DataType_FloatVector ||
				schema.Fields[idx].DataType == schemapb.DataType_BinaryVector {
				schema.Fields[idx].TypeParams = []*commonpb.KeyValuePair{
					{
						Key:   "dim",
						Value: strconv.Itoa(int(Params.MaxDimension) + 1),
					},
				}
			}
		}
		tooLargeDimSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = tooLargeDimSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)

		schema = proto.Clone(schemaBackup).(*schemapb.CollectionSchema)
		schema.Fields[1].DataType = schemapb.DataType_BinaryVector
		schema.Fields[1].TypeParams = []*commonpb.KeyValuePair{
			{
				Key:   "dim",
				Value: strconv.Itoa(int(Params.MaxDimension) + 1),
			},
		}
		binaryTooLargeDimSchema, err := proto.Marshal(schema)
		assert.NoError(t, err)
		task.CreateCollectionRequest.Schema = binaryTooLargeDimSchema
		err = task.PreExecute(ctx)
		assert.Error(t, err)
	})
}