package dhcpv6

import (
	"bytes"
	"net"
	"testing"
)

func TestOptIAPrefix(t *testing.T) {
	buf := []byte{
		0xaa, 0xbb, 0xcc, 0xdd,                         // preferredLifetime
		0xee, 0xff, 0x00, 0x11,                         // validLifetime
		36,                                             // prefixLength
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, // ipv6Prefix
	}
	opt, err := ParseOptIAPrefix(buf)
	if err != nil {
		t.Fatal(err)
	}
	if pl := opt.PreferredLifetime(); pl != 0xaabbccdd {
		t.Fatalf("Invalid Preferred Lifetime. Expected 0xaabbccdd, got %v", pl)
	}
	if vl := opt.ValidLifetime(); vl != 0xeeff0011 {
		t.Fatalf("Invalid Valid Lifetime. Expected 0xeeff0011, got %v", vl)
	}
	if pr := opt.PrefixLength(); pr != 36 {
		t.Fatalf("Invalid Prefix Length. Expected 36, got %v", pr)
	}
	if ip := opt.IPv6Prefix(); !bytes.Equal(ip, net.IPv6loopback) {
		t.Fatalf("Invalid Prefix Length. Expected %v, got %v", net.IPv6loopback, ip)
	}
}

func TestOptIAPrefixToBytes(t *testing.T) {
	buf := []byte{
		0xaa, 0xbb, 0xcc, 0xdd,                         // preferredLifetime
		0xee, 0xff, 0x00, 0x11,                         // validLifetime
		36,                                             // prefixLength
		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ipv6Prefix
	}
	expected := []byte{00, 26, 00, byte(len(buf))}
	expected = append(expected, buf...)
	opt := OptIAPrefix{
		preferredLifetime: 0xaabbccdd,
		validLifetime: 0xeeff0011,
		prefixLength: 36,
	}
	toBytes := opt.ToBytes()
	if !bytes.Equal(toBytes, expected) {
		t.Fatalf("Invalid ToBytes result. Expected %v, got %v", expected, toBytes)
	}
}