package main
import (
	"io/fs"
	"errors"
)

var (
	ErrFileNotExists = errors.New("file does not exist")
	ErrFileReadOnly  = errors.New("file is read only")
	ErrFileWriteOnly = errors.New("file is write only")
	ErrInvalidOffset = errors.New("invalid file offset")
	ErrOffsetChanged = errors.New("offset has already been changed")
	ErrReadOpen      = errors.New("only one file can be opened for reading at a time")
	ErrWriteOpen     = errors.New("only one file can be opened for writing at a time")
	ErrNoRemoveRoot  = errors.New("refusing to remove root directory")
)

type Device struct {
}
type FS struct {
}


type File struct {
	fs            *FS
	path          string
	offset        uint32
	offsetCh      chan uint32
	length        uint32
	amtLeft       uint32
	amtTferd      uint32
	isReadOnly    bool
	isWriteOnly   bool
	offsetChanged bool
}



func (i *Device) HeartRate() (uint8, error) {
	return 10, nil
}

func (i *Device) BatteryLevel() (uint8, error) {
	return 95, nil
}

func (i *Device) StepCount() (uint32, error) {
	return 27000, nil
}

type MotionValues struct {
	X int16
	Y int16
	Z int16
}

func (i *Device) Motion() (MotionValues, error) {
	return MotionValues{-12, +64, -19}, nil
}

func (i *Device) Address() string {
	return "FA:E4:00:00:00:00"
}

func (i *Device) Version() (string, error) {
	return "1.11.0", nil
}

func (blefs *FS) ReadDir(path string) ([]fs.DirEntry, error) {
	var out []fs.DirEntry
	return out, nil
}

func (blefs *FS) Mkdir(path string) error {
	return nil
}

func (blefs *FS) Stat(path string) (fs.FileInfo, error) {
	return nil, ErrFileNotExists
}

func (blefs *FS) Rename(old, new string) error {
	return nil
}

func (blefs *FS) Remove(path string) error {
	return nil
}

func (blefs *FS) Open(path string) (*File, error) {
	return &File{}, nil
}
func (blefs *FS) Create(path string, size uint32) (*File, error) {
	return &File{}, nil
}
func (fl *File) Read(b []byte) (n int, err error) {
	return 0, ErrFileWriteOnly
}
func (fl *File) Write(b []byte) (n int, err error) {
	return 0, ErrFileWriteOnly
}
func (fl *File) Close() error {
	return nil
}
// func (fl *File) Stat() (fs.FileInfo, error) {
// }