package service

import (
	"fmt"
	"io"
	"io/fs"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strings"
	"time"
	"unicode/utf8"

	"github.com/1Panel-dev/1Panel/backend/app/dto/request"
	"github.com/1Panel-dev/1Panel/backend/app/dto/response"
	"github.com/1Panel-dev/1Panel/backend/buserr"
	"github.com/1Panel-dev/1Panel/backend/constant"
	"golang.org/x/net/html/charset"
	"golang.org/x/sys/unix"
	"golang.org/x/text/encoding/simplifiedchinese"
	"golang.org/x/text/transform"

	"github.com/1Panel-dev/1Panel/backend/global"
	"github.com/1Panel-dev/1Panel/backend/utils/common"
	"github.com/1Panel-dev/1Panel/backend/utils/files"
	"github.com/pkg/errors"
)

type FileService struct {
}

type IFileService interface {
	GetFileList(op request.FileOption) (response.FileInfo, error)
	SearchUploadWithPage(req request.SearchUploadWithPage) (int64, interface{}, error)
	GetFileTree(op request.FileOption) ([]response.FileTree, error)
	Create(op request.FileCreate) error
	Delete(op request.FileDelete) error
	BatchDelete(op request.FileBatchDelete) error
	Compress(c request.FileCompress) error
	DeCompress(c request.FileDeCompress) error
	GetContent(op request.FileContentReq) (response.FileInfo, error)
	SaveContent(edit request.FileEdit) error
	FileDownload(d request.FileDownload) (string, error)
	DirSize(req request.DirSizeReq) (response.DirSizeRes, error)
	ChangeName(req request.FileRename) error
	Wget(w request.FileWget) (string, error)
	MvFile(m request.FileMove) error
	ChangeOwner(req request.FileRoleUpdate) error
	ChangeMode(op request.FileCreate) error
	BatchChangeModeAndOwner(op request.FileRoleReq) error
	ReadLogByLine(req request.FileReadByLineReq) (*response.FileLineContent, error)
}

var filteredPaths = []string{
	"/.1panel_clash",
}

func NewIFileService() IFileService {
	return &FileService{}
}

func (f *FileService) GetFileList(op request.FileOption) (response.FileInfo, error) {
	var fileInfo response.FileInfo
	data, err := os.Stat(op.Path)
	if err != nil && os.IsNotExist(err) {
		return fileInfo, nil
	}
	if !data.IsDir() {
		op.FileOption.Path = filepath.Dir(op.FileOption.Path)
	}
	info, err := files.NewFileInfo(op.FileOption)
	if err != nil {
		return fileInfo, err
	}
	fileInfo.FileInfo = *info
	return fileInfo, nil
}

func (f *FileService) SearchUploadWithPage(req request.SearchUploadWithPage) (int64, interface{}, error) {
	var (
		files    []response.UploadInfo
		backData []response.UploadInfo
	)
	_ = filepath.Walk(req.Path, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return nil
		}
		if !info.IsDir() {
			files = append(files, response.UploadInfo{
				CreatedAt: info.ModTime().Format(constant.DateTimeLayout),
				Size:      int(info.Size()),
				Name:      info.Name(),
			})
		}
		return nil
	})
	total, start, end := len(files), (req.Page-1)*req.PageSize, req.Page*req.PageSize
	if start > total {
		backData = make([]response.UploadInfo, 0)
	} else {
		if end >= total {
			end = total
		}
		backData = files[start:end]
	}
	return int64(total), backData, nil
}

func (f *FileService) GetFileTree(op request.FileOption) ([]response.FileTree, error) {
	var treeArray []response.FileTree
	if _, err := os.Stat(op.Path); err != nil && os.IsNotExist(err) {
		return treeArray, nil
	}
	info, err := files.NewFileInfo(op.FileOption)
	if err != nil {
		return nil, err
	}
	node := response.FileTree{
		ID:        common.GetUuid(),
		Name:      info.Name,
		Path:      info.Path,
		IsDir:     info.IsDir,
		Extension: info.Extension,
	}
	err = f.buildFileTree(&node, info.Items, op, 2)
	if err != nil {
		return nil, err
	}
	return append(treeArray, node), nil
}

func shouldFilterPath(path string) bool {
	cleanedPath := filepath.Clean(path)
	for _, filteredPath := range filteredPaths {
		cleanedFilteredPath := filepath.Clean(filteredPath)
		if cleanedFilteredPath == cleanedPath || strings.HasPrefix(cleanedPath, cleanedFilteredPath+"/") {
			return true
		}
	}
	return false
}

// 递归构建文件树(只取当前目录以及当前目录下的第一层子节点)
func (f *FileService) buildFileTree(node *response.FileTree, items []*files.FileInfo, op request.FileOption, level int) error {
	for _, v := range items {
		if shouldFilterPath(v.Path) {
			global.LOG.Infof("File Tree: Skipping %s due to filter\n", v.Path)
			continue
		}
		childNode := response.FileTree{
			ID:        common.GetUuid(),
			Name:      v.Name,
			Path:      v.Path,
			IsDir:     v.IsDir,
			Extension: v.Extension,
		}
		if level > 1 && v.IsDir {
			if err := f.buildChildNode(&childNode, v, op, level); err != nil {
				return err
			}
		}

		node.Children = append(node.Children, childNode)
	}
	return nil
}

func (f *FileService) buildChildNode(childNode *response.FileTree, fileInfo *files.FileInfo, op request.FileOption, level int) error {
	op.Path = fileInfo.Path
	subInfo, err := files.NewFileInfo(op.FileOption)
	if err != nil {
		if os.IsPermission(err) || errors.Is(err, unix.EACCES) {
			global.LOG.Infof("File Tree: Skipping %s due to permission denied\n", fileInfo.Path)
			return nil
		}
		global.LOG.Errorf("File Tree: Skipping %s due to error: %s\n", fileInfo.Path, err.Error())
		return nil
	}

	return f.buildFileTree(childNode, subInfo.Items, op, level-1)
}

func (f *FileService) Create(op request.FileCreate) error {
	if files.IsInvalidChar(op.Path) {
		return buserr.New("ErrInvalidChar")
	}
	fo := files.NewFileOp()
	if fo.Stat(op.Path) {
		return buserr.New(constant.ErrFileIsExist)
	}
	mode := op.Mode
	if mode == 0 {
		fileInfo, err := os.Stat(filepath.Dir(op.Path))
		if err == nil {
			mode = int64(fileInfo.Mode().Perm())
		} else {
			mode = 0755
		}
	}
	if op.IsDir {
		return fo.CreateDirWithMode(op.Path, fs.FileMode(mode))
	}
	if op.IsLink {
		if !fo.Stat(op.LinkPath) {
			return buserr.New(constant.ErrLinkPathNotFound)
		}
		return fo.LinkFile(op.LinkPath, op.Path, op.IsSymlink)
	}
	return fo.CreateFileWithMode(op.Path, fs.FileMode(mode))
}

func (f *FileService) Delete(op request.FileDelete) error {
	fo := files.NewFileOp()
	recycleBinStatus, _ := settingRepo.Get(settingRepo.WithByKey("FileRecycleBin"))
	if recycleBinStatus.Value == "disable" {
		op.ForceDelete = true
	}
	if op.ForceDelete {
		if op.IsDir {
			return fo.DeleteDir(op.Path)
		} else {
			return fo.DeleteFile(op.Path)
		}
	}
	if err := NewIRecycleBinService().Create(request.RecycleBinCreate{SourcePath: op.Path}); err != nil {
		return err
	}
	return favoriteRepo.Delete(favoriteRepo.WithByPath(op.Path))
}

func (f *FileService) BatchDelete(op request.FileBatchDelete) error {
	fo := files.NewFileOp()
	if op.IsDir {
		for _, file := range op.Paths {
			if err := fo.DeleteDir(file); err != nil {
				return err
			}
		}
	} else {
		for _, file := range op.Paths {
			if err := fo.DeleteFile(file); err != nil {
				return err
			}
		}
	}
	return nil
}

func (f *FileService) ChangeMode(op request.FileCreate) error {
	fo := files.NewFileOp()
	return fo.ChmodR(op.Path, op.Mode, op.Sub)
}

func (f *FileService) BatchChangeModeAndOwner(op request.FileRoleReq) error {
	fo := files.NewFileOp()
	for _, path := range op.Paths {
		if !fo.Stat(path) {
			return buserr.New(constant.ErrPathNotFound)
		}
		if err := fo.ChownR(path, op.User, op.Group, op.Sub); err != nil {
			return err
		}
		if err := fo.ChmodR(path, op.Mode, op.Sub); err != nil {
			return err
		}
	}
	return nil

}

func (f *FileService) ChangeOwner(req request.FileRoleUpdate) error {
	fo := files.NewFileOp()
	return fo.ChownR(req.Path, req.User, req.Group, req.Sub)
}

func (f *FileService) Compress(c request.FileCompress) error {
	fo := files.NewFileOp()
	if !c.Replace && fo.Stat(filepath.Join(c.Dst, c.Name)) {
		return buserr.New(constant.ErrFileIsExist)
	}
	return fo.Compress(c.Files, c.Dst, c.Name, files.CompressType(c.Type), c.Secret)
}

func (f *FileService) DeCompress(c request.FileDeCompress) error {
	fo := files.NewFileOp()
	if c.Type == "tar" && len(c.Secret) != 0 {
		c.Type = "tar.gz"
	}
	return fo.Decompress(c.Path, c.Dst, files.CompressType(c.Type), c.Secret)
}

func (f *FileService) GetContent(op request.FileContentReq) (response.FileInfo, error) {
	info, err := files.NewFileInfo(files.FileOption{
		Path:     op.Path,
		Expand:   true,
		IsDetail: op.IsDetail,
	})
	if err != nil {
		return response.FileInfo{}, err
	}

	content := []byte(info.Content)
	if len(content) > 1024 {
		content = content[:1024]
	}
	if !utf8.Valid(content) {
		_, decodeName, _ := charset.DetermineEncoding(content, "")
		if decodeName == "windows-1252" {
			reader := strings.NewReader(info.Content)
			item := transform.NewReader(reader, simplifiedchinese.GBK.NewDecoder())
			contents, err := io.ReadAll(item)
			if err != nil {
				return response.FileInfo{}, err
			}
			info.Content = string(contents)
		}
	}
	return response.FileInfo{FileInfo: *info}, nil
}

func (f *FileService) SaveContent(edit request.FileEdit) error {
	info, err := files.NewFileInfo(files.FileOption{
		Path:   edit.Path,
		Expand: false,
	})
	if err != nil {
		return err
	}

	fo := files.NewFileOp()
	return fo.WriteFile(edit.Path, strings.NewReader(edit.Content), info.FileMode)
}

func (f *FileService) ChangeName(req request.FileRename) error {
	if files.IsInvalidChar(req.NewName) {
		return buserr.New("ErrInvalidChar")
	}
	fo := files.NewFileOp()
	return fo.Rename(req.OldName, req.NewName)
}

func (f *FileService) Wget(w request.FileWget) (string, error) {
	fo := files.NewFileOp()
	key := "file-wget-" + common.GetUuid()
	return key, fo.DownloadFileWithProcess(w.Url, filepath.Join(w.Path, w.Name), key, w.IgnoreCertificate)
}

func (f *FileService) MvFile(m request.FileMove) error {
	fo := files.NewFileOp()
	if !fo.Stat(m.NewPath) {
		return buserr.New(constant.ErrPathNotFound)
	}
	for _, oldPath := range m.OldPaths {
		if !fo.Stat(oldPath) {
			return buserr.WithName(constant.ErrFileNotFound, oldPath)
		}
		if oldPath == m.NewPath || strings.Contains(m.NewPath, filepath.Clean(oldPath)+"/") {
			return buserr.New(constant.ErrMovePathFailed)
		}
	}
	if m.Type == "cut" {
		return fo.Cut(m.OldPaths, m.NewPath, m.Name, m.Cover)
	}
	var errs []error
	if m.Type == "copy" {
		for _, src := range m.OldPaths {
			if err := fo.CopyAndReName(src, m.NewPath, m.Name, m.Cover); err != nil {
				errs = append(errs, err)
				global.LOG.Errorf("copy file [%s] to [%s] failed, err: %s", src, m.NewPath, err.Error())
			}
		}
	}

	var errString string
	for _, err := range errs {
		errString += err.Error() + "\n"
	}
	if errString != "" {
		return errors.New(errString)
	}
	return nil
}

func (f *FileService) FileDownload(d request.FileDownload) (string, error) {
	filePath := d.Paths[0]
	if d.Compress {
		tempPath := filepath.Join(os.TempDir(), fmt.Sprintf("%d", time.Now().UnixNano()))
		if err := os.MkdirAll(tempPath, os.ModePerm); err != nil {
			return "", err
		}
		fo := files.NewFileOp()
		if err := fo.Compress(d.Paths, tempPath, d.Name, files.CompressType(d.Type), ""); err != nil {
			return "", err
		}
		filePath = filepath.Join(tempPath, d.Name)
	}
	return filePath, nil
}

func (f *FileService) DirSize(req request.DirSizeReq) (response.DirSizeRes, error) {
	var (
		res response.DirSizeRes
	)
	if req.Path == "/proc" {
		return res, nil
	}
	cmd := exec.Command("du", "-s", req.Path)
	output, err := cmd.Output()
	if err == nil {
		fields := strings.Fields(string(output))
		if len(fields) == 2 {
			var cmdSize int64
			_, err = fmt.Sscanf(fields[0], "%d", &cmdSize)
			if err == nil {
				res.Size = float64(cmdSize * 1024)
				return res, nil
			}
		}
	}
	fo := files.NewFileOp()
	size, err := fo.GetDirSize(req.Path)
	if err != nil {
		return res, err
	}
	res.Size = size
	return res, nil
}

func (f *FileService) ReadLogByLine(req request.FileReadByLineReq) (*response.FileLineContent, error) {
	logFilePath := ""
	switch req.Type {
	case constant.TypeWebsite:
		website, err := websiteRepo.GetFirst(commonRepo.WithByID(req.ID))
		if err != nil {
			return nil, err
		}
		nginx, err := getNginxFull(&website)
		if err != nil {
			return nil, err
		}
		sitePath := path.Join(nginx.SiteDir, "sites", website.Alias)
		logFilePath = path.Join(sitePath, "log", req.Name)
	case constant.TypePhp:
		php, err := runtimeRepo.GetFirst(commonRepo.WithByID(req.ID))
		if err != nil {
			return nil, err
		}
		logFilePath = php.GetLogPath()
	case constant.TypeSSL:
		ssl, err := websiteSSLRepo.GetFirst(commonRepo.WithByID(req.ID))
		if err != nil {
			return nil, err
		}
		logFilePath = ssl.GetLogPath()
	case constant.TypeSystem:
		fileName := ""
		if len(req.Name) == 0 || req.Name == time.Now().Format("2006-01-02") {
			fileName = "1Panel.log"
		} else {
			fileName = "1Panel-" + req.Name + ".log"
		}
		logFilePath = path.Join(global.CONF.System.DataDir, "log", fileName)
		if _, err := os.Stat(logFilePath); err != nil {
			fileGzPath := path.Join(global.CONF.System.DataDir, "log", fileName+".gz")
			if _, err := os.Stat(fileGzPath); err != nil {
				return nil, buserr.New("ErrHttpReqNotFound")
			}
			if err := handleGunzip(fileGzPath); err != nil {
				return nil, fmt.Errorf("handle ungzip file %s failed, err: %v", fileGzPath, err)
			}
		}
	case "image-pull", "image-push", "image-build", "compose-create":
		logFilePath = path.Join(global.CONF.System.TmpDir, fmt.Sprintf("docker_logs/%s", req.Name))
	}

	lines, isEndOfFile, total, err := files.ReadFileByLine(logFilePath, req.Page, req.PageSize, req.Latest)
	if err != nil {
		return nil, err
	}
	if req.Latest && req.Page == 1 && len(lines) < 1000 && total > 1 {
		preLines, _, _, err := files.ReadFileByLine(logFilePath, total-1, req.PageSize, false)
		if err != nil {
			return nil, err
		}
		lines = append(preLines, lines...)
	}

	res := &response.FileLineContent{
		Content: strings.Join(lines, "\n"),
		End:     isEndOfFile,
		Path:    logFilePath,
		Total:   total,
		Lines:   lines,
	}
	return res, nil
}