package service

import (
	"bufio"
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"
	"path"
	"strings"

	"github.com/1Panel-dev/1Panel/backend/app/dto"
	"github.com/1Panel-dev/1Panel/backend/app/model"
	"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/cloud_storage"
	fileUtils "github.com/1Panel-dev/1Panel/backend/utils/files"
	"github.com/jinzhu/copier"
	"github.com/pkg/errors"
)

type BackupService struct{}

type IBackupService interface {
	List() ([]dto.BackupInfo, error)
	SearchRecordsWithPage(search dto.RecordSearch) (int64, []dto.BackupRecords, error)
	LoadOneDriveInfo() (string, error)
	DownloadRecord(info dto.DownloadRecord) (string, error)
	Create(backupDto dto.BackupOperate) error
	GetBuckets(backupDto dto.ForBuckets) ([]interface{}, error)
	Update(ireq dto.BackupOperate) error
	Delete(id uint) error
	BatchDeleteRecord(ids []uint) error
	NewClient(backup *model.BackupAccount) (cloud_storage.CloudStorageClient, error)

	ListFiles(req dto.BackupSearchFile) ([]string, error)

	MysqlBackup(db dto.CommonBackup) error
	PostgresqlBackup(db dto.CommonBackup) error
	MysqlRecover(db dto.CommonRecover) error
	PostgresqlRecover(db dto.CommonRecover) error
	MysqlRecoverByUpload(req dto.CommonRecover) error
	PostgresqlRecoverByUpload(req dto.CommonRecover) error

	RedisBackup() error
	RedisRecover(db dto.CommonRecover) error

	WebsiteBackup(db dto.CommonBackup) error
	WebsiteRecover(req dto.CommonRecover) error

	AppBackup(db dto.CommonBackup) error
	AppRecover(req dto.CommonRecover) error
}

func NewIBackupService() IBackupService {
	return &BackupService{}
}

func (u *BackupService) List() ([]dto.BackupInfo, error) {
	ops, err := backupRepo.List(commonRepo.WithOrderBy("created_at desc"))
	var dtobas []dto.BackupInfo
	dtobas = append(dtobas, u.loadByType("LOCAL", ops))
	dtobas = append(dtobas, u.loadByType("OSS", ops))
	dtobas = append(dtobas, u.loadByType("S3", ops))
	dtobas = append(dtobas, u.loadByType("SFTP", ops))
	dtobas = append(dtobas, u.loadByType("MINIO", ops))
	dtobas = append(dtobas, u.loadByType("COS", ops))
	dtobas = append(dtobas, u.loadByType("KODO", ops))
	dtobas = append(dtobas, u.loadByType("OneDrive", ops))
	dtobas = append(dtobas, u.loadByType("WebDAV", ops))
	return dtobas, err
}

func (u *BackupService) SearchRecordsWithPage(search dto.RecordSearch) (int64, []dto.BackupRecords, error) {
	total, records, err := backupRepo.PageRecord(
		search.Page, search.PageSize,
		commonRepo.WithOrderBy("created_at desc"),
		commonRepo.WithByName(search.Name),
		commonRepo.WithByType(search.Type),
		backupRepo.WithByDetailName(search.DetailName),
	)

	var datas []dto.BackupRecords
	clientMap := make(map[string]loadSizeHelper)
	for i := 0; i < len(records); i++ {
		var item dto.BackupRecords
		if err := copier.Copy(&item, &records[i]); err != nil {
			return 0, nil, errors.WithMessage(constant.ErrStructTransform, err.Error())
		}
		itemPath := path.Join(records[i].FileDir, records[i].FileName)
		if records[i].Source == "LOCAL" {
			fileInfo, err := os.Stat(itemPath)
			if err == nil {
				item.Size = fileInfo.Size()
			}
			datas = append(datas, item)
			continue
		}
		if _, ok := clientMap[records[i].Source]; !ok {
			backup, err := backupRepo.Get(commonRepo.WithByType(records[i].Source))
			if err != nil {
				global.LOG.Errorf("load backup model %s from db failed, err: %v", records[i].Source, err)
				return total, datas, err
			}
			client, err := u.NewClient(&backup)
			if err != nil {
				global.LOG.Errorf("load backup client %s from db failed, err: %v", records[i].Source, err)
				return total, datas, err
			}
			item.Size, _ = client.Size(path.Join(strings.TrimLeft(backup.BackupPath, "/"), itemPath))
			datas = append(datas, item)
			clientMap[records[i].Source] = loadSizeHelper{backupPath: strings.TrimLeft(backup.BackupPath, "/"), client: client}
			continue
		}
		item.Size, _ = clientMap[records[i].Source].client.Size(path.Join(clientMap[records[i].Source].backupPath, itemPath))
		datas = append(datas, item)
	}
	return total, datas, err
}

type loadSizeHelper struct {
	backupPath string
	client     cloud_storage.CloudStorageClient
}

func (u *BackupService) LoadOneDriveInfo() (string, error) {
	OneDriveID, err := settingRepo.Get(settingRepo.WithByKey("OneDriveID"))
	if err != nil {
		return "", err
	}
	idItem, err := base64.StdEncoding.DecodeString(OneDriveID.Value)
	if err != nil {
		return "", err
	}
	return string(idItem), err
}

func (u *BackupService) DownloadRecord(info dto.DownloadRecord) (string, error) {
	if info.Source == "LOCAL" {
		return info.FileDir + "/" + info.FileName, nil
	}
	backup, _ := backupRepo.Get(commonRepo.WithByType(info.Source))
	if backup.ID == 0 {
		return "", constant.ErrRecordNotFound
	}
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(backup.Vars), &varMap); err != nil {
		return "", err
	}
	varMap["bucket"] = backup.Bucket
	switch backup.Type {
	case constant.Sftp, constant.WebDAV:
		varMap["username"] = backup.AccessKey
		varMap["password"] = backup.Credential
	case constant.OSS, constant.S3, constant.MinIo, constant.Cos, constant.Kodo:
		varMap["accessKey"] = backup.AccessKey
		varMap["secretKey"] = backup.Credential
	case constant.OneDrive:
		varMap["accessToken"] = backup.Credential
	}
	backClient, err := cloud_storage.NewCloudStorageClient(backup.Type, varMap)
	if err != nil {
		return "", fmt.Errorf("new cloud storage client failed, err: %v", err)
	}
	targetPath := fmt.Sprintf("%s/download/%s/%s", constant.DataDir, info.FileDir, info.FileName)
	if _, err := os.Stat(path.Dir(targetPath)); err != nil && os.IsNotExist(err) {
		if err = os.MkdirAll(path.Dir(targetPath), os.ModePerm); err != nil {
			global.LOG.Errorf("mkdir %s failed, err: %v", path.Dir(targetPath), err)
		}
	}
	srcPath := fmt.Sprintf("%s/%s", info.FileDir, info.FileName)
	if len(backup.BackupPath) != 0 {
		srcPath = path.Join(strings.TrimPrefix(backup.BackupPath, "/"), srcPath)
	}
	if exist, _ := backClient.Exist(srcPath); exist {
		isOK, err := backClient.Download(srcPath, targetPath)
		if !isOK {
			return "", fmt.Errorf("cloud storage download failed, err: %v", err)
		}
	}
	return targetPath, nil
}

func (u *BackupService) Create(req dto.BackupOperate) error {
	backup, _ := backupRepo.Get(commonRepo.WithByType(req.Type))
	if backup.ID != 0 {
		return constant.ErrRecordExist
	}
	if err := copier.Copy(&backup, &req); err != nil {
		return errors.WithMessage(constant.ErrStructTransform, err.Error())
	}

	if req.Type == constant.OneDrive {
		if err := u.loadAccessToken(&backup); err != nil {
			return err
		}
	}
	if req.Type != "LOCAL" {
		if _, err := u.checkBackupConn(&backup); err != nil {
			return buserr.WithMap("ErrBackupCheck", map[string]interface{}{"err": err.Error()}, err)
		}
	}
	if err := backupRepo.Create(&backup); err != nil {
		return err
	}
	return nil
}

func (u *BackupService) GetBuckets(backupDto dto.ForBuckets) ([]interface{}, error) {
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(backupDto.Vars), &varMap); err != nil {
		return nil, err
	}
	switch backupDto.Type {
	case constant.Sftp, constant.WebDAV:
		varMap["username"] = backupDto.AccessKey
		varMap["password"] = backupDto.Credential
	case constant.OSS, constant.S3, constant.MinIo, constant.Cos, constant.Kodo:
		varMap["accessKey"] = backupDto.AccessKey
		varMap["secretKey"] = backupDto.Credential
	}
	client, err := cloud_storage.NewCloudStorageClient(backupDto.Type, varMap)
	if err != nil {
		return nil, err
	}
	return client.ListBuckets()
}

func (u *BackupService) Delete(id uint) error {
	cronjobs, _ := cronjobRepo.List(cronjobRepo.WithByBackupID(id))
	if len(cronjobs) != 0 {
		return buserr.New(constant.ErrBackupInUsed)
	}
	return backupRepo.Delete(commonRepo.WithByID(id))
}

func (u *BackupService) BatchDeleteRecord(ids []uint) error {
	records, err := backupRepo.ListRecord(commonRepo.WithIdsIn(ids))
	if err != nil {
		return err
	}
	for _, record := range records {
		if record.Source == "LOCAL" {
			if err := os.Remove(record.FileDir + "/" + record.FileName); err != nil {
				global.LOG.Errorf("remove file %s failed, err: %v", record.FileDir+record.FileName, err)
			}
		} else {
			backupAccount, err := backupRepo.Get(commonRepo.WithByType(record.Source))
			if err != nil {
				return err
			}
			client, err := u.NewClient(&backupAccount)
			if err != nil {
				return err
			}
			if _, err = client.Delete(record.FileDir + record.FileName); err != nil {
				global.LOG.Errorf("remove file %s from %s failed, err: %v", record.FileDir+record.FileName, record.Source, err)
			}
		}
	}
	return backupRepo.DeleteRecord(context.Background(), commonRepo.WithIdsIn(ids))
}

func (u *BackupService) Update(req dto.BackupOperate) error {
	backup, err := backupRepo.Get(commonRepo.WithByID(req.ID))
	if err != nil {
		return constant.ErrRecordNotFound
	}
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(req.Vars), &varMap); err != nil {
		return err
	}

	oldVars := backup.Vars
	oldDir, err := loadLocalDir()
	if err != nil {
		return err
	}
	upMap := make(map[string]interface{})
	upMap["bucket"] = req.Bucket
	upMap["access_key"] = req.AccessKey
	upMap["credential"] = req.Credential
	upMap["backup_path"] = req.BackupPath
	upMap["vars"] = req.Vars
	backup.Bucket = req.Bucket
	backup.Vars = req.Vars
	backup.Credential = req.Credential
	backup.AccessKey = req.AccessKey
	backup.BackupPath = req.BackupPath

	if req.Type == constant.OneDrive {
		if err := u.loadAccessToken(&backup); err != nil {
			return err
		}
		upMap["credential"] = backup.Credential
		upMap["vars"] = backup.Vars
	}
	if backup.Type != "LOCAL" {
		isOk, err := u.checkBackupConn(&backup)
		if err != nil || !isOk {
			return buserr.WithMap("ErrBackupCheck", map[string]interface{}{"err": err.Error()}, err)
		}
	}

	if err := backupRepo.Update(req.ID, upMap); err != nil {
		return err
	}
	if backup.Type == "LOCAL" {
		if dir, ok := varMap["dir"]; ok {
			if dirStr, isStr := dir.(string); isStr {
				if strings.HasSuffix(dirStr, "/") {
					dirStr = dirStr[:strings.LastIndex(dirStr, "/")]
				}
				if err := copyDir(oldDir, dirStr); err != nil {
					_ = backupRepo.Update(req.ID, (map[string]interface{}{"vars": oldVars}))
					return err
				}
			}
		}
	}
	return nil
}

func (u *BackupService) ListFiles(req dto.BackupSearchFile) ([]string, error) {
	backup, err := backupRepo.Get(backupRepo.WithByType(req.Type))
	if err != nil {
		return nil, err
	}
	client, err := u.NewClient(&backup)
	if err != nil {
		return nil, err
	}
	prefix := "system_snapshot"
	if len(backup.BackupPath) != 0 {
		prefix = path.Join(strings.TrimPrefix(backup.BackupPath, "/"), prefix)
	}
	files, err := client.ListObjects(prefix)
	if err != nil {
		return nil, err
	}
	var datas []string
	for _, file := range files {
		if len(file) != 0 {
			datas = append(datas, path.Base(file))
		}
	}
	return datas, nil
}

func (u *BackupService) NewClient(backup *model.BackupAccount) (cloud_storage.CloudStorageClient, error) {
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(backup.Vars), &varMap); err != nil {
		return nil, err
	}
	if backup.Type == "LOCAL" {
		return nil, errors.New("not support")
	}
	varMap["bucket"] = backup.Bucket
	switch backup.Type {
	case constant.Sftp, constant.WebDAV:
		varMap["username"] = backup.AccessKey
		varMap["password"] = backup.Credential
	case constant.OSS, constant.S3, constant.MinIo, constant.Cos, constant.Kodo:
		varMap["accessKey"] = backup.AccessKey
		varMap["secretKey"] = backup.Credential
	case constant.OneDrive:
		varMap["accessToken"] = backup.Credential
	}

	backClient, err := cloud_storage.NewCloudStorageClient(backup.Type, varMap)
	if err != nil {
		return nil, err
	}

	return backClient, nil
}

func (u *BackupService) loadByType(accountType string, accounts []model.BackupAccount) dto.BackupInfo {
	for _, account := range accounts {
		if account.Type == accountType {
			var item dto.BackupInfo
			if err := copier.Copy(&item, &account); err != nil {
				global.LOG.Errorf("copy backup account to dto backup info failed, err: %v", err)
			}
			return item
		}
	}
	return dto.BackupInfo{Type: accountType}
}

func (u *BackupService) loadAccessToken(backup *model.BackupAccount) error {
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(backup.Vars), &varMap); err != nil {
		return fmt.Errorf("unmarshal backup vars failed, err: %v", err)
	}

	data := url.Values{}
	data.Set("client_id", global.CONF.System.OneDriveID)
	data.Set("client_secret", global.CONF.System.OneDriveSc)
	data.Set("grant_type", "authorization_code")
	data.Set("code", varMap["code"].(string))
	data.Set("redirect_uri", constant.OneDriveRedirectURI)
	client := &http.Client{}
	req, err := http.NewRequest("POST", "https://login.microsoftonline.com/common/oauth2/v2.0/token", strings.NewReader(data.Encode()))
	if err != nil {
		return fmt.Errorf("new http post client for access token failed, err: %v", err)
	}
	req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("request for access token failed, err: %v", err)
	}
	delete(varMap, "code")
	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("read data from response body failed, err: %v", err)
	}
	defer resp.Body.Close()

	token := map[string]interface{}{}
	if err := json.Unmarshal(respBody, &token); err != nil {
		return fmt.Errorf("unmarshal data from response body failed, err: %v", err)
	}
	accessToken, ok := token["refresh_token"].(string)
	if !ok {
		return errors.New("no such access token in response")
	}

	itemVars, err := json.Marshal(varMap)
	if err != nil {
		return fmt.Errorf("json marshal var map failed, err: %v", err)
	}
	backup.Credential = accessToken
	backup.Vars = string(itemVars)
	return nil
}

func loadLocalDir() (string, error) {
	backup, err := backupRepo.Get(commonRepo.WithByType("LOCAL"))
	if err != nil {
		return "", err
	}
	varMap := make(map[string]interface{})
	if err := json.Unmarshal([]byte(backup.Vars), &varMap); err != nil {
		return "", err
	}
	if _, ok := varMap["dir"]; !ok {
		return "", errors.New("load local backup dir failed")
	}
	baseDir, ok := varMap["dir"].(string)
	if ok {
		if _, err := os.Stat(baseDir); err != nil && os.IsNotExist(err) {
			if err = os.MkdirAll(baseDir, os.ModePerm); err != nil {
				return "", fmt.Errorf("mkdir %s failed, err: %v", baseDir, err)
			}
		}
		return baseDir, nil
	}
	return "", fmt.Errorf("error type dir: %T", varMap["dir"])
}

func copyDir(src, dst string) error {
	srcInfo, err := os.Stat(src)
	if err != nil {
		return err
	}
	if err = os.MkdirAll(dst, srcInfo.Mode()); err != nil {
		return err
	}
	files, err := os.ReadDir(src)
	if err != nil {
		return err
	}

	fileOP := fileUtils.NewFileOp()
	for _, file := range files {
		srcPath := fmt.Sprintf("%s/%s", src, file.Name())
		dstPath := fmt.Sprintf("%s/%s", dst, file.Name())
		if file.IsDir() {
			if err = copyDir(srcPath, dstPath); err != nil {
				global.LOG.Errorf("copy dir %s to %s failed, err: %v", srcPath, dstPath, err)
			}
		} else {
			if err := fileOP.CopyFile(srcPath, dst); err != nil {
				global.LOG.Errorf("copy file %s to %s failed, err: %v", srcPath, dstPath, err)
			}
		}
	}

	return nil
}

func (u *BackupService) checkBackupConn(backup *model.BackupAccount) (bool, error) {
	client, err := u.NewClient(backup)
	if err != nil {
		return false, err
	}
	fileItem := path.Join(global.CONF.System.TmpDir, "test", "1panel")
	if _, err := os.Stat(path.Dir(fileItem)); err != nil && os.IsNotExist(err) {
		if err = os.MkdirAll(path.Dir(fileItem), os.ModePerm); err != nil {
			return false, err
		}
	}
	file, err := os.OpenFile(fileItem, os.O_WRONLY|os.O_CREATE, 0666)
	if err != nil {
		return false, err
	}
	defer file.Close()
	write := bufio.NewWriter(file)
	_, _ = write.WriteString(string("1Panel 备份账号测试文件。\n"))
	_, _ = write.WriteString(string("1Panel 備份賬號測試文件。\n"))
	_, _ = write.WriteString(string("1Panel Backs up account test files.\n"))
	_, _ = write.WriteString(string("1Panelアカウントのテストファイルをバックアップします。\n"))
	write.Flush()

	targetPath := strings.TrimPrefix(path.Join(backup.BackupPath, "test/1panel"), "/")
	return client.Upload(fileItem, targetPath)
}