package devicepath

import (
	"encoding/hex"
	"errors"
	"fmt"
	"strconv"
	"strings"
)

const macPrefix string = "MAC"

type MacDevicePath struct {
	addr   []byte
	ifType uint8
}

func (mp *MacDevicePath) Type() DeviceNodeType {
	return MessagingDevicePath
}

func (mp *MacDevicePath) SubType() DeviceNodeSubType {
	return MacMessagingSubType
}

func (mp *MacDevicePath) Bytes() []byte {
	return nil
}

func (mp *MacDevicePath) String() string {
	return fmt.Sprintf("%s(%x,%d)", macPrefix, mp.addr, mp.ifType)
}

func (mp *MacDevicePath) ParseString(raw string) error {
	if !checkStringFormat(raw, macPrefix, -1) {
		return ErrMalformedString
	}
	args := strings.Split(raw[len(macPrefix)+1:len(raw)-1], ",")
	if len(args) != 2 {
		return errors.New("unexpected number of arguments")
	}
	if mac, err := hex.DecodeString(args[0]); err != nil {
		return err
	} else {
		mp.addr = mac
	}
	if ifType, err := strconv.Atoi(args[1]); err != nil {
		return err
	} else {
		mp.ifType = uint8(ifType)
	}
	return nil
}