package dns

import "fmt"

// https://datatracker.ietf.org/doc/html/rfc1035#section-3.3.9
type MX struct {
	Pref uint16
	Mx   Name
}

func (mx *MX) Type() uint16 { return TypeMX }

func (mx *MX) Pack(p *packer) error {
	p.writeUint16(mx.Pref)
	return p.writeName(mx.Mx)
}

func (mx *MX) Unpack(u *unpacker, length uint16) error {
	var err error
	mx.Pref, err = u.readUint16()
	if err != nil {
		return err
	}
	mx.Mx, err = u.readName()
	return err
}

func (mx *MX) String() string {
	return fmt.Sprintf("%d %s", mx.Pref, mx.Mx.String())
}