package service

import (
	"fmt"
	"os"
	"path"
	"strings"
	"time"

	"github.com/1Panel-dev/1Panel/backend/app/dto"
	"github.com/1Panel-dev/1Panel/backend/app/model"
	"github.com/1Panel-dev/1Panel/backend/app/repo"
	"github.com/1Panel-dev/1Panel/backend/buserr"
	"github.com/1Panel-dev/1Panel/backend/constant"
	"github.com/1Panel-dev/1Panel/backend/global"
	"github.com/1Panel-dev/1Panel/backend/utils/cmd"
	"github.com/1Panel-dev/1Panel/backend/utils/compose"
	"github.com/1Panel-dev/1Panel/backend/utils/files"
	"github.com/pkg/errors"
)

func (u *BackupService) RedisBackup() error {
	localDir, err := loadLocalDir()
	if err != nil {
		return err
	}
	redisInfo, err := appInstallRepo.LoadBaseInfo("redis", "")
	if err != nil {
		return err
	}
	appendonly, err := configGetStr(redisInfo.ContainerName, redisInfo.Password, "appendonly")
	if err != nil {
		return err
	}
	global.LOG.Infof("appendonly in redis conf is %s", appendonly)

	timeNow := time.Now().Format("20060102150405")
	fileName := fmt.Sprintf("%s.rdb", timeNow)
	if appendonly == "yes" {
		if strings.HasPrefix(redisInfo.Version, "6.") {
			fileName = fmt.Sprintf("%s.aof", timeNow)
		} else {
			fileName = fmt.Sprintf("%s.tar.gz", timeNow)
		}
	}
	backupDir := path.Join(localDir, fmt.Sprintf("database/redis/%s", redisInfo.Name))
	if err := handleRedisBackup(redisInfo, backupDir, fileName); err != nil {
		return err
	}
	record := &model.BackupRecord{
		Type:       "redis",
		Source:     "LOCAL",
		BackupType: "LOCAL",
		FileDir:    backupDir,
		FileName:   fileName,
	}
	if err := backupRepo.CreateRecord(record); err != nil {
		global.LOG.Errorf("save backup record failed, err: %v", err)
	}

	return nil
}

func (u *BackupService) RedisRecover(req dto.CommonRecover) error {
	redisInfo, err := appInstallRepo.LoadBaseInfo("redis", "")
	if err != nil {
		return err
	}
	global.LOG.Infof("recover redis from backup file %s", req.File)
	if err := handleRedisRecover(redisInfo, req.File, false); err != nil {
		return err
	}
	return nil
}

func handleRedisBackup(redisInfo *repo.RootInfo, backupDir, fileName string) error {
	fileOp := files.NewFileOp()
	if !fileOp.Stat(backupDir) {
		if err := os.MkdirAll(backupDir, os.ModePerm); err != nil {
			return fmt.Errorf("mkdir %s failed, err: %v", backupDir, err)
		}
	}

	stdout, err := cmd.Execf("docker exec %s redis-cli -a %s --no-auth-warning save", redisInfo.ContainerName, redisInfo.Password)
	if err != nil {
		return errors.New(string(stdout))
	}

	if strings.HasSuffix(fileName, ".tar.gz") {
		redisDataDir := fmt.Sprintf("%s/%s/%s/data/appendonlydir", constant.AppInstallDir, "redis", redisInfo.Name)
		if err := handleTar(redisDataDir, backupDir, fileName, ""); err != nil {
			return err
		}
		return nil
	}
	if strings.HasSuffix(fileName, ".aof") {
		stdout1, err := cmd.Execf("docker cp %s:/data/appendonly.aof %s/%s", redisInfo.ContainerName, backupDir, fileName)
		if err != nil {
			return errors.New(string(stdout1))
		}
		return nil
	}

	stdout1, err1 := cmd.Execf("docker cp %s:/data/dump.rdb %s/%s", redisInfo.ContainerName, backupDir, fileName)
	if err1 != nil {
		return errors.New(string(stdout1))
	}
	return nil
}

func handleRedisRecover(redisInfo *repo.RootInfo, recoverFile string, isRollback bool) error {
	fileOp := files.NewFileOp()
	if !fileOp.Stat(recoverFile) {
		return buserr.WithName("ErrFileNotFound", recoverFile)
	}

	appendonly, err := configGetStr(redisInfo.ContainerName, redisInfo.Password, "appendonly")
	if err != nil {
		return err
	}

	if appendonly == "yes" {
		if strings.HasPrefix(redisInfo.Version, "6.") && !strings.HasSuffix(recoverFile, ".aof") {
			return buserr.New(constant.ErrTypeOfRedis)
		}
		if strings.HasPrefix(redisInfo.Version, "7.") && !strings.HasSuffix(recoverFile, ".tar.gz") {
			return buserr.New(constant.ErrTypeOfRedis)
		}
	} else {
		if !strings.HasSuffix(recoverFile, ".rdb") {
			return buserr.New(constant.ErrTypeOfRedis)
		}
	}

	global.LOG.Infof("appendonly in redis conf is %s", appendonly)
	isOk := false
	if !isRollback {
		suffix := "rdb"
		if appendonly == "yes" {
			if strings.HasPrefix(redisInfo.Version, "6.") {
				suffix = "aof"
			} else {
				suffix = "tar.gz"
			}
		}
		rollbackFile := path.Join(global.CONF.System.TmpDir, fmt.Sprintf("database/redis/%s_%s.%s", redisInfo.Name, time.Now().Format("20060102150405"), suffix))
		if err := handleRedisBackup(redisInfo, path.Dir(rollbackFile), path.Base(rollbackFile)); err != nil {
			return fmt.Errorf("backup database %s for rollback before recover failed, err: %v", redisInfo.Name, err)
		}
		defer func() {
			if !isOk {
				global.LOG.Info("recover failed, start to rollback now")
				if err := handleRedisRecover(redisInfo, rollbackFile, true); err != nil {
					global.LOG.Errorf("rollback redis from %s failed, err: %v", rollbackFile, err)
					return
				}
				global.LOG.Infof("rollback redis from %s successful", rollbackFile)
				_ = os.RemoveAll(rollbackFile)
			} else {
				_ = os.RemoveAll(rollbackFile)
			}
		}()
	}
	composeDir := fmt.Sprintf("%s/redis/%s", constant.AppInstallDir, redisInfo.Name)
	if _, err := compose.Down(composeDir + "/docker-compose.yml"); err != nil {
		return err
	}
	if appendonly == "yes" && strings.HasPrefix(redisInfo.Version, "7.") {
		redisDataDir := fmt.Sprintf("%s/%s/%s/data", constant.AppInstallDir, "redis", redisInfo.Name)
		if err := handleUnTar(recoverFile, redisDataDir); err != nil {
			return err
		}
	} else {
		itemName := "dump.rdb"
		if appendonly == "yes" && strings.HasPrefix(redisInfo.Version, "6.") {
			itemName = "appendonly.aof"
		}
		input, err := os.ReadFile(recoverFile)
		if err != nil {
			return err
		}
		if err = os.WriteFile(composeDir+"/data/"+itemName, input, 0640); err != nil {
			return err
		}
	}
	if _, err := compose.Up(composeDir + "/docker-compose.yml"); err != nil {
		return err
	}
	isOk = true
	return nil
}
