package dhcpv6

import (
	"log"
	"net"
	"testing"

	"github.com/insomniacslk/dhcp/iana"
	"github.com/stretchr/testify/require"
)

func TestWithClientID(t *testing.T) {
	duid := Duid{
		Type:          DUID_LL,
		HwType:        iana.HWTypeEthernet,
		LinkLayerAddr: net.HardwareAddr([]byte{0xfa, 0xce, 0xb0, 0x00, 0x00, 0x0c}),
	}
	m, err := NewMessage(WithClientID(duid))
	require.NoError(t, err)
	opt := m.GetOneOption(OptionClientID)
	require.NotNil(t, opt)
	cid := opt.(*OptClientId)
	require.Equal(t, cid.Cid, duid)
}

func TestWithServerID(t *testing.T) {
	duid := Duid{
		Type:          DUID_LL,
		HwType:        iana.HWTypeEthernet,
		LinkLayerAddr: net.HardwareAddr([]byte{0xfa, 0xce, 0xb0, 0x00, 0x00, 0x0c}),
	}
	m, err := NewMessage(WithServerID(duid))
	require.NoError(t, err)
	opt := m.GetOneOption(OptionServerID)
	require.NotNil(t, opt)
	sid := opt.(*OptServerId)
	require.Equal(t, sid.Sid, duid)
}

func TestWithRequestedOptions(t *testing.T) {
	// Check if ORO is created when no ORO present
	m, err := NewMessage(WithRequestedOptions(OptionClientID))
	require.NoError(t, err)
	opt := m.GetOneOption(OptionORO)
	require.NotNil(t, opt)
	oro := opt.(*OptRequestedOption)
	require.ElementsMatch(t, oro.RequestedOptions(), []OptionCode{OptionClientID})
	// Check if already set options are preserved
	m = WithRequestedOptions(OptionServerID)(m)
	opt = m.GetOneOption(OptionORO)
	require.NotNil(t, opt)
	oro = opt.(*OptRequestedOption)
	require.ElementsMatch(t, oro.RequestedOptions(), []OptionCode{OptionClientID, OptionServerID})
}

func TestWithIANA(t *testing.T) {
	d := WithIANA(OptIAAddress{
		IPv6Addr:          net.ParseIP("::1"),
		PreferredLifetime: 3600,
		ValidLifetime:     5200,
	})(&DHCPv6Message{})
	require.Equal(t, 1, len(d.Options()))
	require.Equal(t, OptionIANA, d.Options()[0].Code())
}

func TestWithDNS(t *testing.T) {
	d := WithDNS([]net.IP{
		net.ParseIP("fe80::1"),
		net.ParseIP("fe80::2"),
	}...)(&DHCPv6Message{})
	require.Equal(t, 1, len(d.Options()))
	dns := d.Options()[0].(*OptDNSRecursiveNameServer)
	log.Printf("DNS %+v", dns)
	require.Equal(t, OptionDNSRecursiveNameServer, dns.Code())
	require.Equal(t, 2, len(dns.NameServers))
	require.Equal(t, net.ParseIP("fe80::1"), dns.NameServers[0])
	require.Equal(t, net.ParseIP("fe80::2"), dns.NameServers[1])
	require.NotEqual(t, net.ParseIP("fe80::1"), dns.NameServers[1])
}

func TestWithDomainSearchList(t *testing.T) {
	d := WithDomainSearchList([]string{
		"slackware.it",
		"dhcp.slackware.it",
	}...)(&DHCPv6Message{})
	require.Equal(t, 1, len(d.Options()))
	osl := d.Options()[0].(*OptDomainSearchList)
	require.Equal(t, OptionDomainSearchList, osl.Code())
	require.NotNil(t, osl.DomainSearchList)
	labels := osl.DomainSearchList.Labels
	require.Equal(t, 2, len(labels))
	require.Equal(t, "slackware.it", labels[0])
	require.Equal(t, "dhcp.slackware.it", labels[1])
}