package nfsfs

import (
	"io"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
	"time"

	"imuslab.com/arozos/mod/filesystem/arozfs"
)

/*
	NFSFS.go

	Network File System as File System Abstraction

*/

type NFSFileSystemAbstraction struct {
	uuid      string
	hierarchy string
}

func NewNFSFileSystemAbstraction(uuid string, hierarchy string, hostname string, target string, dir string, username string, password string) (NFSFileSystemAbstraction, error) {

	return NFSFileSystemAbstraction{
		uuid:      uuid,
		hierarchy: hierarchy,
	}, nil
}
func (l NFSFileSystemAbstraction) Chmod(filename string, mode os.FileMode) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Chown(filename string, uid int, gid int) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Chtimes(filename string, atime time.Time, mtime time.Time) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Create(filename string) (arozfs.File, error) {
	return nil, arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Mkdir(filename string, mode os.FileMode) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) MkdirAll(filename string, mode os.FileMode) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Name() string {
	return ""
}
func (l NFSFileSystemAbstraction) Open(filename string) (arozfs.File, error) {
	return nil, arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) OpenFile(filename string, flag int, perm os.FileMode) (arozfs.File, error) {
	return nil, arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Remove(filename string) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) RemoveAll(path string) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Rename(oldname, newname string) error {
	return arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Stat(filename string) (os.FileInfo, error) {
	return nil, arozfs.ErrNullOperation
}
func (l NFSFileSystemAbstraction) Close() error {
	return nil
}

/*
	Abstraction Utilities
*/

func (a NFSFileSystemAbstraction) VirtualPathToRealPath(subpath string, username string) (string, error) {
	return arozfs.GenericVirtualPathToRealPathTranslator(a.uuid, a.hierarchy, subpath, username)
}

func (a NFSFileSystemAbstraction) RealPathToVirtualPath(fullpath string, username string) (string, error) {
	return arozfs.GenericRealPathToVirtualPathTranslator(a.uuid, a.hierarchy, fullpath, username)
}

func (a NFSFileSystemAbstraction) FileExists(realpath string) bool {
	return false
}

func (a NFSFileSystemAbstraction) IsDir(realpath string) bool {
	return false
}

func (a NFSFileSystemAbstraction) Glob(realpathWildcard string) ([]string, error) {
	return []string{}, arozfs.ErrNullOperation
}

func (a NFSFileSystemAbstraction) GetFileSize(realpath string) int64 {
	return 0
}

func (a NFSFileSystemAbstraction) GetModTime(realpath string) (int64, error) {
	return 0, arozfs.ErrOperationNotSupported
}

func (a NFSFileSystemAbstraction) WriteFile(filename string, content []byte, mode os.FileMode) error {
	return arozfs.ErrNullOperation
}
func (a NFSFileSystemAbstraction) ReadFile(filename string) ([]byte, error) {
	return []byte(""), arozfs.ErrOperationNotSupported
}
func (a NFSFileSystemAbstraction) ReadDir(filename string) ([]fs.DirEntry, error) {
	return []fs.DirEntry{}, arozfs.ErrOperationNotSupported
}
func (a NFSFileSystemAbstraction) WriteStream(filename string, stream io.Reader, mode os.FileMode) error {
	return arozfs.ErrNullOperation
}
func (a NFSFileSystemAbstraction) ReadStream(filename string) (io.ReadCloser, error) {

	return nil, arozfs.ErrOperationNotSupported
}

func (a NFSFileSystemAbstraction) Walk(root string, walkFn filepath.WalkFunc) error {
	return arozfs.ErrOperationNotSupported
}

//Utilities
func filterFilepath(rawpath string) string {
	rawpath = arozfs.ToSlash(filepath.Clean(strings.TrimSpace(rawpath)))
	if strings.HasPrefix(rawpath, "./") {
		return rawpath[1:]
	} else if rawpath == "." || rawpath == "" {
		return "/"
	}
	return rawpath
}