// Copyright 2016 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 executor

import (
	"fmt"
	"slices"
	"testing"
	"time"

	"github.com/pingcap/tidb/pkg/domain"
	"github.com/pingcap/tidb/pkg/errctx"
	"github.com/pingcap/tidb/pkg/executor/join"
	"github.com/pingcap/tidb/pkg/kv"
	"github.com/pingcap/tidb/pkg/parser/ast"
	"github.com/pingcap/tidb/pkg/parser/mysql"
	"github.com/pingcap/tidb/pkg/sessionctx/variable"
	"github.com/pingcap/tidb/pkg/tablecodec"
	"github.com/pingcap/tidb/pkg/types"
	"github.com/pingcap/tidb/pkg/util/collate"
	"github.com/pingcap/tidb/pkg/util/memory"
	"github.com/pingcap/tidb/pkg/util/mock"
	"github.com/pingcap/tidb/pkg/util/ranger"
	"github.com/pingcap/tidb/pkg/util/tableutil"
	"github.com/stretchr/testify/require"
)

// Note: it's a tricky way to export the `inspectionSummaryRules` and `inspectionRules` for unit test but invisible for normal code
var (
	InspectionSummaryRules = inspectionSummaryRules
	InspectionRules        = inspectionRules
)

func TestBuildKvRangesForIndexJoinWithoutCwc(t *testing.T) {
	indexRanges := make([]*ranger.Range, 0, 6)
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 1, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 2, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 2, 1, 2))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 3, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(2, 1, 1, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(2, 1, 2, 1, 1))

	joinKeyRows := make([]*join.IndexJoinLookUpContent, 0, 5)
	joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(1, 1)})
	joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(1, 2)})
	joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(2, 1)})
	joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(2, 2)})
	joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(2, 3)})

	keyOff2IdxOff := []int{1, 3}
	ctx := mock.NewContext()
	kvRanges, err := buildKvRangesForIndexJoin(ctx.GetDistSQLCtx(), ctx.GetRangerCtx(), 0, 0, joinKeyRows, indexRanges, keyOff2IdxOff, nil, nil, nil)
	require.NoError(t, err)
	// Check the kvRanges is in order.
	for i, kvRange := range kvRanges {
		require.True(t, kvRange.StartKey.Cmp(kvRange.EndKey) < 0)
		if i > 0 {
			require.True(t, kvRange.StartKey.Cmp(kvRanges[i-1].EndKey) >= 0)
		}
	}
}

func TestBuildKvRangesForIndexJoinWithoutCwcAndWithMemoryTracker(t *testing.T) {
	indexRanges := make([]*ranger.Range, 0, 6)
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 1, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 2, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 2, 1, 2))
	indexRanges = append(indexRanges, generateIndexRange(1, 1, 3, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(2, 1, 1, 1, 1))
	indexRanges = append(indexRanges, generateIndexRange(2, 1, 2, 1, 1))

	bytesConsumed1 := int64(0)
	{
		joinKeyRows := make([]*join.IndexJoinLookUpContent, 0, 10)
		for i := int64(0); i < 10; i++ {
			joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(1, i)})
		}

		keyOff2IdxOff := []int{1, 3}
		ctx := mock.NewContext()
		memTracker := memory.NewTracker(memory.LabelForIndexWorker, -1)
		kvRanges, err := buildKvRangesForIndexJoin(ctx.GetDistSQLCtx(), ctx.GetRangerCtx(), 0, 0, joinKeyRows, indexRanges, keyOff2IdxOff, nil, memTracker, nil)
		require.NoError(t, err)
		// Check the kvRanges is in order.
		for i, kvRange := range kvRanges {
			require.True(t, kvRange.StartKey.Cmp(kvRange.EndKey) < 0)
			if i > 0 {
				require.True(t, kvRange.StartKey.Cmp(kvRanges[i-1].EndKey) >= 0)
			}
		}
		bytesConsumed1 = memTracker.BytesConsumed()
	}

	bytesConsumed2 := int64(0)
	{
		joinKeyRows := make([]*join.IndexJoinLookUpContent, 0, 20)
		for i := int64(0); i < 20; i++ {
			joinKeyRows = append(joinKeyRows, &join.IndexJoinLookUpContent{Keys: generateDatumSlice(1, i)})
		}

		keyOff2IdxOff := []int{1, 3}
		ctx := mock.NewContext()
		memTracker := memory.NewTracker(memory.LabelForIndexWorker, -1)
		kvRanges, err := buildKvRangesForIndexJoin(ctx.GetDistSQLCtx(), ctx.GetRangerCtx(), 0, 0, joinKeyRows, indexRanges, keyOff2IdxOff, nil, memTracker, nil)
		require.NoError(t, err)
		// Check the kvRanges is in order.
		for i, kvRange := range kvRanges {
			require.True(t, kvRange.StartKey.Cmp(kvRange.EndKey) < 0)
			if i > 0 {
				require.True(t, kvRange.StartKey.Cmp(kvRanges[i-1].EndKey) >= 0)
			}
		}
		bytesConsumed2 = memTracker.BytesConsumed()
	}

	require.Equal(t, 2*bytesConsumed1, bytesConsumed2)
	require.Equal(t, int64(23640), bytesConsumed1)
}

func generateIndexRange(vals ...int64) *ranger.Range {
	lowDatums := generateDatumSlice(vals...)
	highDatums := slices.Clone(lowDatums)
	return &ranger.Range{LowVal: lowDatums, HighVal: highDatums, Collators: collate.GetBinaryCollatorSlice(len(lowDatums))}
}

func generateDatumSlice(vals ...int64) []types.Datum {
	datums := make([]types.Datum, len(vals))
	for i, val := range vals {
		datums[i].SetInt64(val)
	}
	return datums
}

func TestSlowQueryRuntimeStats(t *testing.T) {
	stats := &slowQueryRuntimeStats{
		totalFileNum: 2,
		readFileNum:  2,
		readFile:     time.Second,
		initialize:   time.Millisecond,
		readFileSize: 1024 * 1024 * 1024,
		parseLog:     int64(time.Millisecond * 100),
		concurrent:   15,
	}
	require.Equal(t, "initialize: 1ms, read_file: 1s, parse_log: {time:100ms, concurrency:15}, total_file: 2, read_file: 2, read_size: 1024 MB", stats.String())
	require.Equal(t, stats.Clone().String(), stats.String())
	stats.Merge(stats.Clone())
	require.Equal(t, "initialize: 2ms, read_file: 2s, parse_log: {time:200ms, concurrency:15}, total_file: 4, read_file: 4, read_size: 2 GB", stats.String())
}

func TestFilterTemporaryTableKeys(t *testing.T) {
	vars := variable.NewSessionVars(nil)
	const tableID int64 = 3
	vars.TxnCtx = &variable.TransactionContext{
		TxnCtxNoNeedToRestore: variable.TxnCtxNoNeedToRestore{
			TemporaryTables: map[int64]tableutil.TempTable{tableID: nil},
		},
	}

	res := filterTemporaryTableKeys(vars, []kv.Key{tablecodec.EncodeTablePrefix(tableID), tablecodec.EncodeTablePrefix(42)})
	require.Len(t, res, 1)
}

func TestErrLevelsForResetStmtContext(t *testing.T) {
	ctx := mock.NewContext()
	ctx.BindDomainAndSchValidator(&domain.Domain{}, nil)

	cases := []struct {
		name    string
		sqlMode mysql.SQLMode
		stmt    []ast.StmtNode
		levels  errctx.LevelMap
	}{
		{
			name:    "strict,write",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.InsertStmt{}, &ast.UpdateStmt{}, &ast.DeleteStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelError
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelError
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "non-strict,write",
			sqlMode: mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.InsertStmt{}, &ast.UpdateStmt{}, &ast.DeleteStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelWarn
				l[errctx.ErrGroupNoDefault] = errctx.LevelWarn
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "strict,insert ignore",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.InsertStmt{IgnoreErr: true}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelWarn
				l[errctx.ErrGroupBadNull] = errctx.LevelWarn
				l[errctx.ErrGroupNoDefault] = errctx.LevelWarn
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelWarn
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelWarn
				return
			}(),
		},
		{
			name:    "strict,update ignore",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.UpdateStmt{IgnoreErr: true}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelWarn
				l[errctx.ErrGroupBadNull] = errctx.LevelWarn
				l[errctx.ErrGroupNoDefault] = errctx.LevelWarn
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelWarn
				return
			}(),
		},
		{
			name:    "strict,delete ignore",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.DeleteStmt{IgnoreErr: true}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelWarn
				l[errctx.ErrGroupBadNull] = errctx.LevelWarn
				l[errctx.ErrGroupNoDefault] = errctx.LevelWarn
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "strict without error_for_division_by_zero,write",
			sqlMode: mysql.ModeStrictAllTables,
			stmt:    []ast.StmtNode{&ast.InsertStmt{}, &ast.UpdateStmt{}, &ast.DeleteStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelError
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelIgnore
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "strict,select/union",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.SelectStmt{}, &ast.SetOprStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "non-strict,select/union",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.SelectStmt{}, &ast.SetOprStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelWarn
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelError
				return
			}(),
		},
		{
			name:    "strict,load_data",
			sqlMode: mysql.ModeStrictAllTables | mysql.ModeErrorForDivisionByZero,
			stmt:    []ast.StmtNode{&ast.LoadDataStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelError
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelWarn
				return
			}(),
		},
		{
			name:    "non-strict,load_data",
			sqlMode: mysql.SQLMode(0),
			stmt:    []ast.StmtNode{&ast.LoadDataStmt{}},
			levels: func() (l errctx.LevelMap) {
				l[errctx.ErrGroupTruncate] = errctx.LevelError
				l[errctx.ErrGroupDupKey] = errctx.LevelError
				l[errctx.ErrGroupBadNull] = errctx.LevelError
				l[errctx.ErrGroupNoDefault] = errctx.LevelError
				l[errctx.ErrGroupDividedByZero] = errctx.LevelWarn
				l[errctx.ErrGroupAutoIncReadFailed] = errctx.LevelError
				l[errctx.ErrGroupNoMatchedPartition] = errctx.LevelWarn
				return
			}(),
		},
	}

	for i, c := range cases {
		require.NotEmpty(t, c.stmt, c.name)
		for _, stmt := range c.stmt {
			msg := fmt.Sprintf("%d: %s, stmt: %T", i, c.name, stmt)
			ctx.GetSessionVars().SQLMode = c.sqlMode
			require.NoError(t, ResetContextOfStmt(ctx, stmt), msg)
			ec := ctx.GetSessionVars().StmtCtx.ErrCtx()
			require.Equal(t, c.levels, ec.LevelMap(), msg)
		}
	}
}