package devicepath

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
)

const ipv4Prefix string = "IPv4"

type Ipv4DevicePath struct {
	remoteIP string
	protocol string
	static   bool
}

func (ip *Ipv4DevicePath) Type() DeviceNodeType {
	return MessagingDevicePath
}

func (ip *Ipv4DevicePath) SubType() DeviceNodeSubType {
	return IPv4MessagingSubType
}

func (ip *Ipv4DevicePath) Bytes() []byte {
	return nil
}

func (ip *Ipv4DevicePath) String() string {
	ipType := 0
	if ip.static {
		ipType = 1
	}
	return fmt.Sprintf("%s(%s,%s,%d)", ipv4Prefix, ip.remoteIP, ip.protocol, ipType)
}

func (ip *Ipv4DevicePath) ParseString(raw string) error {
	if !checkStringFormat(raw, ipv4Prefix, -1) {
		return ErrMalformedString
	}
	args := strings.Split(raw[len(ipv4Prefix)+1:len(raw)-1], ",")
	if len(args) != 3 {
		return errors.New("unexpected number of arguments")
	}

	ip.remoteIP = args[0]
	ip.protocol = args[1]
	if ipType, err := strconv.Atoi(args[2]); err != nil {
		return err
	} else {
		ip.static = ipType == 1
	}
	return nil
}