package service

import (
	"bufio"
	"fmt"
	"os"
	"os/exec"
	"path"
	"strconv"
	"strings"
	"time"

	"github.com/1Panel-dev/1Panel/agent/app/dto"
	"github.com/1Panel-dev/1Panel/agent/app/model"
	"github.com/1Panel-dev/1Panel/agent/app/repo"
	"github.com/1Panel-dev/1Panel/agent/app/task"
	"github.com/1Panel-dev/1Panel/agent/buserr"
	"github.com/1Panel-dev/1Panel/agent/constant"
	"github.com/1Panel-dev/1Panel/agent/global"
	"github.com/1Panel-dev/1Panel/agent/utils/alert_push"
	"github.com/1Panel-dev/1Panel/agent/utils/clam"
	"github.com/1Panel-dev/1Panel/agent/utils/cmd"
	"github.com/1Panel-dev/1Panel/agent/utils/common"
	"github.com/1Panel-dev/1Panel/agent/utils/controller"
	"github.com/1Panel-dev/1Panel/agent/utils/xpack"
	"github.com/jinzhu/copier"
	"github.com/robfig/cron/v3"
)

type ClamService struct {
	serviceName      string
	freshClamService string
}

type IClamService interface {
	LoadBaseInfo() (dto.ClamBaseInfo, error)
	Operate(operate string) error
	SearchWithPage(search dto.SearchClamWithPage) (int64, interface{}, error)
	Create(req dto.ClamCreate, operator string) error
	Update(req dto.ClamUpdate, operator string) error
	UpdateStatus(id uint, status string) error
	Delete(req dto.ClamDelete) error
	HandleOnce(id uint) error

	LoadFile(req dto.ClamFileReq) (string, error)
	UpdateFile(req dto.UpdateByNameAndFile) error

	SearchRecords(req dto.ClamLogSearch) (int64, interface{}, error)
	CleanRecord(id uint) error
}

func NewIClamService() IClamService {
	return &ClamService{}
}

func (c *ClamService) LoadBaseInfo() (dto.ClamBaseInfo, error) {
	var baseInfo dto.ClamBaseInfo
	baseInfo.Version = "-"
	baseInfo.FreshVersion = "-"

	clamSvc, err := controller.LoadServiceName("clam")
	if err != nil {
		baseInfo.IsExist = false
		return baseInfo, nil
	}
	c.serviceName = clamSvc
	exist, _ := controller.CheckExist(clamSvc)
	if exist {
		baseInfo.IsExist = true
		baseInfo.IsActive, _ = controller.CheckActive(clamSvc)
	}

	freshSvc, err := controller.LoadServiceName("freshclam")
	if err != nil {
		baseInfo.FreshIsExist = false
		return baseInfo, nil
	}
	c.freshClamService = freshSvc
	freshExist, _ := controller.CheckExist(freshSvc)
	if freshExist {
		baseInfo.FreshIsExist = true
		baseInfo.FreshIsActive, _ = controller.CheckActive(freshSvc)
	}

	if !cmd.Which("clamdscan") {
		baseInfo.IsActive = false
	}

	cmdMgr := cmd.NewCommandMgr(cmd.WithTimeout(20 * time.Second))
	if baseInfo.IsActive {
		version, err := cmdMgr.RunWithStdout("clamdscan", "--version")
		if err == nil {
			if strings.Contains(version, "/") {
				baseInfo.Version = strings.TrimPrefix(strings.Split(version, "/")[0], "ClamAV ")
			} else {
				baseInfo.Version = strings.TrimPrefix(version, "ClamAV ")
			}
		}
	} else {
		_ = clam.CheckWithStopAll(false, clamRepo)
	}
	if baseInfo.FreshIsActive {
		version, err := cmdMgr.RunWithStdout("freshclam", "--version")
		if err == nil {
			if strings.Contains(version, "/") {
				baseInfo.FreshVersion = strings.TrimPrefix(strings.Split(version, "/")[0], "ClamAV ")
			} else {
				baseInfo.FreshVersion = strings.TrimPrefix(version, "ClamAV ")
			}
		}
	}
	return baseInfo, nil
}

func (c *ClamService) Operate(operate string) error {
	switch operate {
	case "start", "restart", "stop":
		if err := controller.Handle(operate, c.serviceName); err != nil {
			return fmt.Errorf("%s the %s failed, err: %s", operate, c.serviceName, err)
		}
		return nil
	case "fresh-start", "fresh-restart", "fresh-stop":
		if err := controller.Handle(strings.TrimPrefix(operate, "fresh-"), c.freshClamService); err != nil {
			return fmt.Errorf("%s the %s failed, err: %s", operate, c.serviceName, err)
		}
		return nil
	default:
		return fmt.Errorf("not support such operation: %v", operate)
	}
}

func (c *ClamService) SearchWithPage(req dto.SearchClamWithPage) (int64, interface{}, error) {
	total, clams, err := clamRepo.Page(req.Page, req.PageSize, repo.WithByLikeName(req.Info), repo.WithOrderRuleBy(req.OrderBy, req.Order))
	if err != nil {
		return 0, nil, err
	}
	var datas []dto.ClamInfo
	for _, clam := range clams {
		var item dto.ClamInfo
		if err := copier.Copy(&item, &clam); err != nil {
			return 0, nil, buserr.WithDetail("ErrStructTransform", err.Error(), nil)
		}
		datas = append(datas, item)
	}
	for i := 0; i < len(datas); i++ {
		record, _ := clamRepo.RecordFirst(datas[i].ID)
		if record.ID != 0 {
			datas[i].LastRecordStatus = record.Status
			datas[i].LastRecordTime = record.StartTime.Format(constant.DateTimeLayout)
		} else {
			datas[i].LastRecordTime = "-"
		}
		alertBase := dto.AlertBase{
			AlertType: "clams",
			EntryID:   datas[i].ID,
		}
		alertInfo, _ := alertRepo.Get(alertRepo.WithByType(alertBase.AlertType), alertRepo.WithByProject(strconv.Itoa(int(alertBase.EntryID))), repo.WithByStatus(constant.AlertEnable))
		datas[i].AlertMethod = alertInfo.Method
		if alertInfo.SendCount != 0 {
			datas[i].AlertCount = alertInfo.SendCount
		} else {
			datas[i].AlertCount = 0
		}
	}
	return total, datas, err
}

func (c *ClamService) Create(req dto.ClamCreate, operator string) error {
	clam, _ := clamRepo.Get(repo.WithByName(req.Name))
	if clam.ID != 0 {
		return buserr.New("ErrRecordExist")
	}
	if cmd.CheckIllegal(req.Path) {
		return buserr.New("ErrCmdIllegal")
	}
	if err := copier.Copy(&clam, &req); err != nil {
		return buserr.WithDetail("ErrStructTransform", err.Error(), nil)
	}
	if clam.InfectedStrategy == "none" || clam.InfectedStrategy == "remove" {
		clam.InfectedDir = ""
	}
	if len(req.Spec) != 0 {
		entryID, err := xpack.MultiNodeProvider.StartClam(&clam, false)
		if err != nil {
			return err
		}
		clam.EntryID = entryID
		clam.Status = constant.StatusEnable
	}
	if err := clamRepo.Create(&clam); err != nil {
		return err
	}
	if req.AlertCount != 0 && req.AlertTitle != "" && req.AlertMethod != "" {
		createAlert := dto.AlertCreate{
			Title:     req.AlertTitle,
			SendCount: req.AlertCount,
			Method:    req.AlertMethod,
			Type:      "clams",
			Project:   strconv.Itoa(int(clam.ID)),
			Status:    constant.AlertEnable,
		}
		err := NewIAlertService().CreateAlert(createAlert, operator)
		if err != nil {
			return err
		}
	}
	return nil
}

func (c *ClamService) Update(req dto.ClamUpdate, operator string) error {
	if cmd.CheckIllegal(req.Path) {
		return buserr.New("ErrCmdIllegal")
	}
	clam, _ := clamRepo.Get(repo.WithByName(req.Name))
	if clam.ID == 0 {
		return buserr.New("ErrRecordNotFound")
	}
	if req.InfectedStrategy == "none" || req.InfectedStrategy == "remove" {
		req.InfectedDir = ""
	}
	var clamItem model.Clam
	if err := copier.Copy(&clamItem, &req); err != nil {
		return buserr.WithDetail("ErrStructTransform", err.Error(), nil)
	}
	clamItem.EntryID = clam.EntryID
	upMap := map[string]interface{}{}
	if len(clam.Spec) != 0 && clam.EntryID != 0 {
		global.Cron.Remove(cron.EntryID(clamItem.EntryID))
		upMap["entry_id"] = 0
	}
	if len(req.Spec) == 0 {
		upMap["status"] = ""
		upMap["entry_id"] = 0
	}
	if len(req.Spec) != 0 && clam.Status != constant.StatusDisable {
		newEntryID, err := xpack.MultiNodeProvider.StartClam(&clamItem, true)
		if err != nil {
			return err
		}
		upMap["entry_id"] = newEntryID
	}
	if len(clam.Spec) == 0 && len(req.Spec) != 0 {
		upMap["status"] = constant.StatusEnable
	}

	upMap["name"] = req.Name
	upMap["path"] = req.Path
	upMap["infected_dir"] = req.InfectedDir
	upMap["infected_strategy"] = req.InfectedStrategy
	upMap["spec"] = req.Spec
	upMap["timeout"] = req.Timeout
	upMap["description"] = req.Description
	if err := clamRepo.Update(req.ID, upMap); err != nil {
		return err
	}
	updateAlert := dto.AlertCreate{
		Title:     req.AlertTitle,
		SendCount: req.AlertCount,
		Method:    req.AlertMethod,
		Type:      "clams",
		Project:   strconv.Itoa(int(clam.ID)),
	}
	err := NewIAlertService().ExternalUpdateAlert(updateAlert, operator)
	if err != nil {
		return err
	}
	return nil
}

func (c *ClamService) UpdateStatus(id uint, status string) error {
	clam, _ := clamRepo.Get(repo.WithByID(id))
	if clam.ID == 0 {
		return buserr.New("ErrRecordNotFound")
	}
	var (
		entryID int
		err     error
	)
	if status == constant.StatusEnable {
		entryID, err = xpack.MultiNodeProvider.StartClam(&clam, true)
		if err != nil {
			return err
		}
	} else {
		global.Cron.Remove(cron.EntryID(clam.EntryID))
		global.LOG.Infof("stop cronjob entryID: %v", clam.EntryID)
	}

	return clamRepo.Update(clam.ID, map[string]interface{}{"status": status, "entry_id": entryID})
}

func (c *ClamService) Delete(req dto.ClamDelete) error {
	for _, id := range req.Ids {
		clam, _ := clamRepo.Get(repo.WithByID(id))
		if clam.ID == 0 {
			continue
		}
		if len(clam.Spec) != 0 {
			global.Cron.Remove(cron.EntryID(clam.EntryID))
		}
		_ = c.CleanRecord(clam.ID)
		if req.RemoveInfected {
			_ = os.RemoveAll(path.Join(clam.InfectedDir, "1panel-infected", clam.Name))
		}
		if err := clamRepo.Delete(repo.WithByID(id)); err != nil {
			return err
		}
		err := alertRepo.Delete(alertRepo.WithByProject(strconv.Itoa(int(clam.ID))), alertRepo.WithByType("clams"))
		if err != nil {
			return err
		}
	}
	return nil
}

func (c *ClamService) HandleOnce(id uint) error {
	if active := clam.CheckWithStopAll(true, clamRepo); !active {
		return buserr.New("ErrClamdscanNotFound")
	}
	clamItem, _ := clamRepo.Get(repo.WithByID(id))
	if clamItem.ID == 0 {
		return buserr.New("ErrRecordNotFound")
	}
	record := clamRepo.StartRecords(clamItem.ID)
	taskItem, err := task.NewTaskWithOps("clam-"+clamItem.Name, task.TaskScan, task.TaskScopeClam, record.TaskID, clamItem.ID)
	if err != nil {
		return fmt.Errorf("new task for exec shell failed, err: %v", err)
	}
	clam.AddScanTask(taskItem, clamItem, record.StartTime.Format(constant.DateTimeSlimLayout))
	go func() {
		err := taskItem.Execute()
		taskRepo := repo.NewITaskRepo()
		taskItem, _ := taskRepo.GetFirst(taskRepo.WithByID(record.TaskID))
		if len(taskItem.ID) == 0 {
			record.TaskID = ""
		}
		if err != nil {
			clamRepo.EndRecords(record, constant.StatusFailed, err.Error())
			return
		}
		clam.AnalysisFromLog(taskItem.LogFile, &record)
		clamRepo.EndRecords(record, constant.StatusDone, "")
		handleAlert(record.InfectedFiles, clamItem.Name, clamItem.ID)
	}()
	return nil
}

func (c *ClamService) SearchRecords(req dto.ClamLogSearch) (int64, interface{}, error) {
	clam, _ := clamRepo.Get(repo.WithByID(req.ClamID))
	if clam.ID == 0 {
		return 0, nil, buserr.New("ErrRecordNotFound")
	}
	loc, _ := time.LoadLocation(common.LoadTimeZoneByCmd())
	req.StartTime = req.StartTime.In(loc)
	req.EndTime = req.EndTime.In(loc)

	total, records, err := clamRepo.PageRecords(req.Page, req.PageSize, clamRepo.WithByClamID(req.ClamID), repo.WithByStatus(req.Status), repo.WithByCreatedAt(req.StartTime, req.EndTime))
	if err != nil {
		return 0, nil, err
	}
	var datas []dto.ClamRecord
	for _, record := range records {
		var item dto.ClamRecord
		if err := copier.Copy(&item, &record); err != nil {
			return 0, nil, buserr.WithDetail("ErrStructTransform", err.Error(), nil)
		}
		datas = append(datas, item)
	}
	return int64(total), datas, nil
}

func (c *ClamService) CleanRecord(id uint) error {
	record, _ := clamRepo.ListRecord()
	for _, item := range record {
		if len(item.TaskID) != 0 {
			continue
		}
		taskItem, _ := taskRepo.GetFirst(taskRepo.WithByID(item.TaskID))
		if len(taskItem.LogFile) != 0 {
			_ = os.Remove(taskItem.LogFile)
		}
	}
	return clamRepo.DeleteRecord(clamRepo.WithByClamID(id))
}

func (c *ClamService) LoadFile(req dto.ClamFileReq) (string, error) {
	filePath := ""
	switch req.Name {
	case "clamd":
		filePath = c.loadConfigPath("clamd")
	case "clamd-log":
		filePath = c.loadLogPath("clamd-log")
	case "freshclam":
		filePath = c.loadConfigPath("freshclam")
	case "freshclam-log":
		filePath = c.loadLogPath("freshclam-log")
	default:
		return "", fmt.Errorf("not support such type")
	}
	if _, err := os.Stat(filePath); err != nil {
		return "", buserr.New("ErrHttpReqNotFound")
	}
	var tail string
	if req.Tail != "0" {
		tail = req.Tail
	} else {
		tail = "+1"
	}
	cmd := exec.Command("tail", "-n", tail, filePath)
	stdout, err := cmd.CombinedOutput()
	if err != nil {
		return "", fmt.Errorf("tail -n %v failed, err: %v", req.Tail, err)
	}
	return string(stdout), nil
}

func (c *ClamService) UpdateFile(req dto.UpdateByNameAndFile) error {
	filePath := ""
	switch req.Name {
	case "clamd":
		filePath = c.loadConfigPath("clamd")
	case "freshclam":
		filePath = c.loadConfigPath("freshclam")
	default:
		return fmt.Errorf("not support such type")
	}
	file, err := os.OpenFile(filePath, os.O_WRONLY|os.O_TRUNC, 0640)
	if err != nil {
		return err
	}
	defer file.Close()
	write := bufio.NewWriter(file)
	_, _ = write.WriteString(req.File)
	write.Flush()

	_ = controller.HandleRestart(c.serviceName)
	return nil
}

func (c *ClamService) loadLogPath(name string) string {
	configKey := "clamd"
	searchPrefix := "LogFile "
	if name != "clamd-log" {
		configKey = "freshclam"
		searchPrefix = "UpdateLogFile "
	}
	confPath := c.loadConfigPath(configKey)
	content, err := os.ReadFile(confPath)
	if err != nil {
		global.LOG.Debugf("read config of %s failed, err: %v", configKey, err)
		return ""
	}
	lines := strings.Split(string(content), "\n")
	for _, line := range lines {
		if strings.HasPrefix(line, searchPrefix) {
			return strings.Trim(strings.ReplaceAll(line, searchPrefix, ""), " ")
		}
	}
	if configKey == "clamd" {
		if _, err := os.Stat("/var/log/clamav/clamav.log"); err == nil {
			return "/var/log/clamav/clamav.log"
		}
		if _, err := os.Stat("/var/log/clamd.scan"); err == nil {
			return "/var/log/clamd.scan"
		}
	}
	if configKey == "freshclam" {
		if _, err := os.Stat("/var/log/clamav/freshclam.log"); err == nil {
			return "/var/log/clamav/freshclam.log"
		}
		if _, err := os.Stat("/var/log/freshclam.log"); err == nil {
			return "/var/log/freshclam.log"
		}
	}
	return ""
}

func (c *ClamService) loadConfigPath(confType string) string {
	switch confType {
	case "clamd":
		if _, err := os.Stat("/etc/clamav/clamd.conf"); err == nil {
			return "/etc/clamav/clamd.conf"
		}
		return "/etc/clamd.d/scan.conf"
	case "freshclam":
		if _, err := os.Stat("/etc/clamav/freshclam.conf"); err == nil {
			return "/etc/clamav/freshclam.conf"
		}
		return "/etc/freshclam.conf"
	default:
		return ""
	}
}

func handleAlert(infectedFiles, clamName string, clamId uint) {
	itemInfected, _ := strconv.Atoi(strings.TrimSpace(infectedFiles))
	if itemInfected <= 0 {
		return
	}
	pushAlert := dto.PushAlert{
		TaskName:  clamName,
		AlertType: "clams",
		EntryID:   clamId,
		Param:     strconv.Itoa(itemInfected),
	}
	_ = alert_push.PushAlert(pushAlert)
}