package dhcpv4

import (
	"net"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestTransactionIDModifier(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	d = WithTransactionID(0xddccbbaa)(d)
	require.Equal(t, uint32(0xddccbbaa), d.TransactionID())
}

func TestBroadcastModifier(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	// set and test broadcast
	d = WithBroadcast(true)(d)
	require.Equal(t, true, d.IsBroadcast())
	// set and test unicast
	d = WithBroadcast(false)(d)
	require.Equal(t, true, d.IsUnicast())
}

func TestHwAddrModifier(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	hwaddr := [16]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf}
	d = WithHwAddr(hwaddr[:])(d)
	require.Equal(t, hwaddr, d.ClientHwAddr())
}

func TestWithOptionModifier(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	d = WithOption(&OptDomainName{DomainName: "slackware.it"})(d)
	opt := d.GetOneOption(OptionDomainName)
	require.NotNil(t, opt)
	dnOpt := opt.(*OptDomainName)
	require.Equal(t, "slackware.it", dnOpt.DomainName)
}

func TestUserClassModifier(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	userClass := WithUserClass([]byte("linuxboot"), false)
	d = userClass(d)
	expected := []byte{
		77, // OptionUserClass
		9,  // length
		'l', 'i', 'n', 'u', 'x', 'b', 'o', 'o', 't',
	}
	require.Equal(t, "User Class Information -> linuxboot", d.options[0].String())
	require.Equal(t, expected, d.options[0].ToBytes())
}

func TestUserClassModifierRFC(t *testing.T) {
	d, _ := New()
	userClass := WithUserClass([]byte("linuxboot"), true)
	d = userClass(d)
	expected := []byte{
		77, // OptionUserClass
		10, // length
		9, 'l', 'i', 'n', 'u', 'x', 'b', 'o', 'o', 't',
	}
	require.Equal(t, "User Class Information -> linuxboot", d.options[0].String())
	require.Equal(t, expected, d.options[0].ToBytes())
}

func TestWithNetboot(t *testing.T) {
	d, _ := New()
	d = WithNetboot(d)
	require.Equal(t, "Parameter Request List -> [TFTP Server Name, Bootfile Name]", d.options[0].String())
}

func TestWithNetbootExistingTFTP(t *testing.T) {
	d, _ := New()
	OptParams := &OptParameterRequestList{
		RequestedOpts: []OptionCode{OptionTFTPServerName},
	}
	d.AddOption(OptParams)
	d = WithNetboot(d)
	require.Equal(t, "Parameter Request List -> [TFTP Server Name, Bootfile Name]", d.options[0].String())
}

func TestWithNetbootExistingBootfileName(t *testing.T) {
	d, _ := New()
	OptParams := &OptParameterRequestList{
		RequestedOpts: []OptionCode{OptionBootfileName},
	}
	d.AddOption(OptParams)
	d = WithNetboot(d)
	require.Equal(t, "Parameter Request List -> [Bootfile Name, TFTP Server Name]", d.options[0].String())
}

func TestWithNetbootExistingBoth(t *testing.T) {
	d, _ := New()
	OptParams := &OptParameterRequestList{
		RequestedOpts: []OptionCode{OptionBootfileName, OptionTFTPServerName},
	}
	d.AddOption(OptParams)
	d = WithNetboot(d)
	require.Equal(t, "Parameter Request List -> [Bootfile Name, TFTP Server Name]", d.options[0].String())
}

func TestWithRequestedOptions(t *testing.T) {
	// Check if OptionParameterRequestList is created when not present
	d, err := New()
	require.NoError(t, err)
	d = WithRequestedOptions(OptionFQDN)(d)
	require.NotNil(t, d)
	o := d.GetOneOption(OptionParameterRequestList)
	require.NotNil(t, o)
	opts := o.(*OptParameterRequestList)
	require.ElementsMatch(t, opts.RequestedOpts, []OptionCode{OptionFQDN})
	// Check if already set options are preserved
	d = WithRequestedOptions(OptionHostName)(d)
	require.NotNil(t, d)
	o = d.GetOneOption(OptionParameterRequestList)
	require.NotNil(t, o)
	opts = o.(*OptParameterRequestList)
	require.ElementsMatch(t, opts.RequestedOpts, []OptionCode{OptionFQDN, OptionHostName})
}

func TestWithRelay(t *testing.T) {
	d, err := New()
	require.NoError(t, err)
	ip := net.ParseIP("10.0.0.1")
	require.NotNil(t, ip)
	d = WithRelay(ip)(d)
	require.NotNil(t, d)
	require.True(t, d.IsUnicast(), "expected unicast")
	require.Equal(t, ip, d.GatewayIPAddr())
	require.Equal(t, uint8(1), d.HopCount())
}

func TestWithNetmask(t *testing.T) {
	d := &DHCPv4{}
	d = WithNetmask(net.IPv4Mask(255, 255, 255, 0))(d)
	require.Equal(t, 1, len(d.options))
	require.Equal(t, OptionSubnetMask, d.options[0].Code())
	osm := d.options[0].(*OptSubnetMask)
	require.Equal(t, net.IPv4Mask(255, 255, 255, 0), osm.SubnetMask)
}

func TestWithLeaseTime(t *testing.T) {
	d := &DHCPv4{}
	d = WithLeaseTime(uint32(3600))(d)
	require.Equal(t, 1, len(d.options))
	require.Equal(t, OptionIPAddressLeaseTime, d.options[0].Code())
	olt := d.options[0].(*OptIPAddressLeaseTime)
	require.Equal(t, uint32(3600), olt.LeaseTime)
}

func TestWithDNS(t *testing.T) {
	d := &DHCPv4{}
	d = WithDNS(net.ParseIP("10.0.0.1"), net.ParseIP("10.0.0.2"))(d)
	require.Equal(t, 1, len(d.options))
	require.Equal(t, OptionDomainNameServer, d.options[0].Code())
	olt := d.options[0].(*OptDomainNameServer)
	require.Equal(t, 2, len(olt.NameServers))
	require.Equal(t, net.ParseIP("10.0.0.1"), olt.NameServers[0])
	require.Equal(t, net.ParseIP("10.0.0.2"), olt.NameServers[1])
	require.NotEqual(t, net.ParseIP("10.0.0.1"), olt.NameServers[1])
}

func TestWithDomainSearchList(t *testing.T) {
	d := &DHCPv4{}
	d = WithDomainSearchList("slackware.it", "dhcp.slackware.it")(d)
	require.Equal(t, 1, len(d.options))
	osl := d.options[0].(*OptDomainSearch)
	require.Equal(t, OptionDNSDomainSearchList, osl.Code())
	require.NotNil(t, osl.DomainSearch)
	require.Equal(t, 2, len(osl.DomainSearch.Labels))
	require.Equal(t, "slackware.it", osl.DomainSearch.Labels[0])
	require.Equal(t, "dhcp.slackware.it", osl.DomainSearch.Labels[1])
}

func TestWithRouter(t *testing.T) {
	d := &DHCPv4{}
	rtr := net.ParseIP("10.0.0.254")
	d = WithRouter(rtr)(d)
	require.Equal(t, 1, len(d.options))
	ortr := d.options[0].(*OptRouter)
	require.Equal(t, OptionRouter, ortr.Code())
	require.Equal(t, 1, len(ortr.Routers))
	require.Equal(t, rtr, ortr.Routers[0])
}