// 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"
	"testing"

	"github.com/stretchr/testify/assert"

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

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

	t.Run("test setIndexInfo", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		segment, err := genSimpleSealedSegment()
		assert.NoError(t, err)

		loader.indexLoader.rootCoord = newMockRootCoord()
		loader.indexLoader.indexCoord = newMockIndexCoord()

		err = loader.indexLoader.setIndexInfo(defaultCollectionID, segment, rowIDFieldID)
		assert.NoError(t, err)
	})

	t.Run("test nil root and index", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		segment, err := genSimpleSealedSegment()
		assert.NoError(t, err)

		err = loader.indexLoader.setIndexInfo(defaultCollectionID, segment, rowIDFieldID)
		assert.NoError(t, err)
	})
}

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

	t.Run("test getIndexBinlog", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		paths, err := generateIndex(defaultSegmentID)
		assert.NoError(t, err)

		_, _, _, err = loader.indexLoader.getIndexBinlog(paths)
		assert.NoError(t, err)
	})

	t.Run("test invalid path", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		_, _, _, err = loader.indexLoader.getIndexBinlog([]string{""})
		assert.Error(t, err)
	})
}

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

	node, err := genSimpleQueryNode(ctx)
	assert.NoError(t, err)
	loader := node.loader
	assert.NotNil(t, loader)

	indexKV := []*commonpb.KeyValuePair{
		{
			Key:   "test-key-0",
			Value: "test-value-0",
		},
	}
	loader.indexLoader.printIndexParams(indexKV)
}

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

	t.Run("test loadIndex", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		segment, err := genSimpleSealedSegment()
		assert.NoError(t, err)

		loader.indexLoader.rootCoord = newMockRootCoord()
		loader.indexLoader.indexCoord = newMockIndexCoord()

		err = loader.indexLoader.setIndexInfo(defaultCollectionID, segment, simpleVecField.id)
		assert.NoError(t, err)

		err = loader.indexLoader.loadIndex(segment, simpleVecField.id)
		assert.NoError(t, err)
	})

	t.Run("test set indexinfo with empty indexFilePath", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		segment, err := genSimpleSealedSegment()
		assert.NoError(t, err)

		loader.indexLoader.rootCoord = newMockRootCoord()
		ic := newMockIndexCoord()
		ic.idxFileInfo.IndexFilePaths = []string{}

		loader.indexLoader.indexCoord = ic

		err = loader.indexLoader.setIndexInfo(defaultCollectionID, segment, simpleVecField.id)
		assert.Error(t, err)

	})

	//t.Run("test get index failed", func(t *testing.T) {
	//	historical, err := genSimpleHistorical(ctx)
	//	assert.NoError(t, err)
	//
	//	segment, err := genSimpleSealedSegment()
	//	assert.NoError(t, err)
	//
	//	historical.loader.indexLoader.rootCoord = newMockRootCoord()
	//	historical.loader.indexLoader.indexCoord = newMockIndexCoord()
	//
	//	err = historical.loader.indexLoader.loadIndex(segment, rowIDFieldID)
	//	assert.Error(t, err)
	//})

	t.Run("test checkIndexReady failed", func(t *testing.T) {
		node, err := genSimpleQueryNode(ctx)
		assert.NoError(t, err)
		loader := node.loader
		assert.NotNil(t, loader)

		segment, err := genSimpleSealedSegment()
		assert.NoError(t, err)

		loader.indexLoader.rootCoord = newMockRootCoord()
		loader.indexLoader.indexCoord = newMockIndexCoord()

		err = loader.indexLoader.setIndexInfo(defaultCollectionID, segment, rowIDFieldID)
		assert.NoError(t, err)

		segment.indexInfos[rowIDFieldID].setReadyLoad(false)

		err = loader.indexLoader.loadIndex(segment, rowIDFieldID)
		assert.Error(t, err)
	})
}