package db

import (
	. "code.hoteas.com/golang/hotime/common"
	"os"
	"strings"
)

// backupSave 保存备份
// path: 备份文件路径
// tt: 表名
// code: 备份类型 0=全部, 1=仅数据, 2=仅DDL
func (that *HoTimeDB) backupSave(path string, tt string, code int) {
	fd, _ := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
	defer fd.Close()

	str := "\r\n"
	if code == 0 || code == 2 {
		str += that.backupDdl(tt)
	}

	if code == 0 || code == 1 {
		str += "insert  into `" + tt + "`\r\n\r\n("
		str += that.backupCol(tt)
	}

	_, _ = fd.Write([]byte(str))
}

// backupDdl 备份表结构（DDL）
func (that *HoTimeDB) backupDdl(tt string) string {
	data := that.Query("show create table " + tt)
	if len(data) == 0 {
		return ""
	}

	return ObjToStr(data[0]["Create Table"]) + ";\r\n\r\n"
}

// backupCol 备份表数据
func (that *HoTimeDB) backupCol(tt string) string {
	str := ""
	data := that.Select(tt, "*")

	lthData := len(data)

	if lthData == 0 {
		return str
	}

	lthCol := len(data[0])
	col := make([]string, lthCol)
	tempLthData := 0

	for k := range data[0] {
		if tempLthData == lthCol-1 {
			str += "`" + k + "`) "
		} else {
			str += "`" + k + "`,"
		}
		col[tempLthData] = k
		tempLthData++
	}

	str += " values"

	for j := 0; j < lthData; j++ {
		for m := 0; m < lthCol; m++ {
			if m == 0 {
				str += "("
			}

			v := "NULL"
			if data[j][col[m]] != nil {
				v = "'" + strings.Replace(ObjToStr(data[j][col[m]]), "'", `\'`, -1) + "'"
			}

			if m == lthCol-1 {
				str += v + ") "
			} else {
				str += v + ","
			}
		}

		if j == lthData-1 {
			str += ";\r\n\r\n"
		} else {
			str += ",\r\n\r\n"
		}
	}

	return str
}