/*
Copyright © 2020 Marvin

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 diff

import (
	"fmt"
	"log"
	"strings"

	"github.com/pingcap/parser/model"
	"github.com/pingcap/tidb/types"
	"github.com/pingcap/enterprise-toolkit/tichecker/pkg/dbutil"
	"github.com/pingcap/enterprise-toolkit/tichecker/pkg/utils"
	"go.uber.org/zap"
)

func ignoreColumns(tableInfo *model.TableInfo, columns []string) *model.TableInfo {
	if len(columns) == 0 {
		return tableInfo
	}

	removeColMap := utils.SliceToMap(columns)
	for i := 0; i < len(tableInfo.Indices); i++ {
		index := tableInfo.Indices[i]
		for j := 0; j < len(index.Columns); j++ {
			col := index.Columns[j]
			if _, ok := removeColMap[col.Name.O]; ok {
				tableInfo.Indices = append(tableInfo.Indices[:i], tableInfo.Indices[i+1:]...)
				i--
				break
			}
		}
	}

	for j := 0; j < len(tableInfo.Columns); j++ {
		col := tableInfo.Columns[j]
		if _, ok := removeColMap[col.Name.O]; ok {
			tableInfo.Columns = append(tableInfo.Columns[:j], tableInfo.Columns[j+1:]...)
			j--
		}
	}

	// calculate column offset
	colMap := make(map[string]int, len(tableInfo.Columns))
	for i, col := range tableInfo.Columns {
		col.Offset = i
		colMap[col.Name.O] = i
	}

	for _, index := range tableInfo.Indices {
		for _, col := range index.Columns {
			offset, ok := colMap[col.Name.O]
			if !ok {
				// this should never happened
				log.Fatal("column not exists", zap.String("column", col.Name.O))
			}
			col.Offset = offset
		}
	}

	return tableInfo
}

func getColumnsFromIndex(index *model.IndexInfo, tableInfo *model.TableInfo) []*model.ColumnInfo {
	indexColumns := make([]*model.ColumnInfo, 0, len(index.Columns))
	for _, indexColumn := range index.Columns {
		for _, column := range tableInfo.Columns {
			if column.Name.O == indexColumn.Name.O {
				indexColumns = append(indexColumns, column)
			}
		}
	}

	return indexColumns
}
func minLenInSlices(slices [][]string) int {
	min := 0
	for i, slice := range slices {
		if i == 0 || len(slice) < min {
			min = len(slice)
		}
	}

	return min
}
func needQuotes(ft types.FieldType) bool {
	return !(dbutil.IsNumberType(ft.Tp) || dbutil.IsFloatType(ft.Tp))
}

func rowToString(row map[string]*dbutil.ColumnData) string {
	var s strings.Builder
	s.WriteString("{ ")
	for key, val := range row {
		if val.IsNull {
			s.WriteString(fmt.Sprintf("%s: IsNull, ", key))
		} else {
			s.WriteString(fmt.Sprintf("%s: %s, ", key, val.Data))
		}
	}
	s.WriteString(" }")

	return s.String()
}