package dns

import (
	"fmt"
	"net/netip"
)

type AAAA struct {
	Addr netip.Addr
}

func (a *AAAA) Type() uint16 {
	return TypeAAAA
}

func (a *AAAA) Pack(p *packer) error {
	b := a.Addr.As16()
	p.buf = append(p.buf, b[:]...)
	return nil
}

func (a *AAAA) Unpack(u *unpacker, length uint16) error {
	if length != 16 {
		return fmt.Errorf("dns: AAAA rdata length %d != 16", length)
	}
	if u.off+16 > len(u.buf) {
		return fmt.Errorf("dns: short AAAA rdata")
	}
	a.Addr = netip.AddrFrom16([16]byte(u.buf[u.off : u.off+16]))
	u.off += 16
	return nil
}

func (a *AAAA) String() string { return a.Addr.String() }