package devicepath

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

const pciRootPrefix string = "PciRoot"

type PCIRootDevicePath struct {
	uid int32
}

func (prp *PCIRootDevicePath) Type() DeviceNodeType {
	return ACPIDevicePath
}

func (prp *PCIRootDevicePath) SubType() DeviceNodeSubType {
	return ACPISubType
}

func (prp *PCIRootDevicePath) Bytes() []byte {
	return nil
}

func (prp *PCIRootDevicePath) String() string {
	return fmt.Sprintf("%s(0x%x)", pciRootPrefix, prp.uid)
}

func (prp *PCIRootDevicePath) ParseString(raw string) error {
	if !checkStringFormat(raw, pciRootPrefix, -1) {
		return ErrMalformedString
	}
	args := strings.Split(raw[len(pciRootPrefix)+1:len(raw)-1], ",")
	if len(args) != 1 {
		return errors.New("unexpected number of arguments")
	}
	if uid, err := strconv.ParseInt(args[0], 0, 32); err != nil {
		return err
	} else {
		prp.uid = int32(uid)
	}
	return nil
}