// Copyright 2021 PingCAP, Inc.
//
// 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 statistics

import (
	"flag"
	"testing"

	"github.com/pingcap/tidb/pkg/config"
	"github.com/pingcap/tidb/pkg/parser/mysql"
	"github.com/pingcap/tidb/pkg/sessionctx/stmtctx"
	"github.com/pingcap/tidb/pkg/testkit/testdata"
	"github.com/pingcap/tidb/pkg/testkit/testmain"
	"github.com/pingcap/tidb/pkg/testkit/testsetup"
	"github.com/pingcap/tidb/pkg/types"
	"github.com/stretchr/testify/require"
	"go.uber.org/goleak"
)

var testDataMap = make(testdata.BookKeeper, 3)

func TestMain(m *testing.M) {
	testsetup.SetupForCommonTest()

	if !flag.Parsed() {
		flag.Parse()
	}

	config.UpdateGlobal(func(conf *config.Config) {
		conf.TiKVClient.AsyncCommit.SafeWindow = 0
		conf.TiKVClient.AsyncCommit.AllowedClockDrift = 0
	})

	testDataMap.LoadTestSuiteData("testdata", "integration_suite")

	opts := []goleak.Option{
		goleak.IgnoreTopFunction("github.com/golang/glog.(*fileSink).flushDaemon"),
		goleak.IgnoreTopFunction("github.com/bazelbuild/rules_go/go/tools/bzltestutil.RegisterTimeoutHandler.func1"),
		goleak.IgnoreTopFunction("github.com/lestrrat-go/httprc.runFetchWorker"),
		goleak.IgnoreTopFunction("go.etcd.io/etcd/client/pkg/v3/logutil.(*MergeLogger).outputLoop"),
		goleak.IgnoreTopFunction("go.opencensus.io/stats/view.(*worker).start"),
	}

	callback := func(i int) int {
		testDataMap.GenerateOutputIfNeeded()
		return i
	}
	goleak.VerifyTestMain(testmain.WrapTestingM(m, callback), opts...)
}

func GetIntegrationSuiteData() testdata.TestData {
	return testDataMap["integration_suite"]
}

// TestStatistics batches tests sharing a test suite to reduce the setups
// overheads.
func TestStatistics(t *testing.T) {
	// fmsketch_test.go
	t.Run("SubTestSketch", SubTestSketch())
	t.Run("SubTestSketchProtoConversion", SubTestSketchProtoConversion())
	t.Run("SubTestFMSketchCoding", SubTestFMSketchCoding())

	// statistics_test.go
	t.Run("SubTestColumnRange", SubTestColumnRange())
	t.Run("SubTestIntColumnRanges", SubTestIntColumnRanges())
	t.Run("SubTestIndexRanges", SubTestIndexRanges())

	// statistics_serial_test.go
	t.Run("SubTestBuild", SubTestBuild())
	t.Run("SubTestHistogramProtoConversion", SubTestHistogramProtoConversion())
}

func createTestStatisticsSamples(t *testing.T) *testStatisticsSamples {
	s := new(testStatisticsSamples)

	s.count = 100000
	samples := make([]*SampleItem, 10000)
	for i := 0; i < len(samples); i++ {
		samples[i] = &SampleItem{}
	}
	start := 1000
	samples[0].Value.SetInt64(0)
	for i := 1; i < start; i++ {
		samples[i].Value.SetInt64(2)
	}
	for i := start; i < len(samples); i++ {
		samples[i].Value.SetInt64(int64(i))
	}
	for i := start; i < len(samples); i += 3 {
		samples[i].Value.SetInt64(samples[i].Value.GetInt64() + 1)
	}
	for i := start; i < len(samples); i += 5 {
		samples[i].Value.SetInt64(samples[i].Value.GetInt64() + 2)
	}
	sc := stmtctx.NewStmtCtx()

	err := sortSampleItems(sc, samples)
	require.NoError(t, err)
	s.samples = samples
	rc := &recordSet{
		data:   make([]types.Datum, s.count),
		count:  s.count,
		cursor: 0,
	}
	rc.setFields(mysql.TypeLonglong)
	rc.data[0].SetInt64(0)
	for i := 1; i < start; i++ {
		rc.data[i].SetInt64(2)
	}
	for i := start; i < rc.count; i++ {
		rc.data[i].SetInt64(int64(i))
	}
	for i := start; i < rc.count; i += 3 {
		rc.data[i].SetInt64(rc.data[i].GetInt64() + 1)
	}
	for i := start; i < rc.count; i += 5 {
		rc.data[i].SetInt64(rc.data[i].GetInt64() + 2)
	}
	require.NoError(t, types.SortDatums(sc.TypeCtx(), rc.data))

	s.rc = rc

	pk := &recordSet{
		data:   make([]types.Datum, s.count),
		count:  s.count,
		cursor: 0,
	}
	pk.setFields(mysql.TypeLonglong)
	for i := 0; i < rc.count; i++ {
		pk.data[i].SetInt64(int64(i))
	}
	s.pk = pk

	return s
}