package dhcpv4

import (
	"net"
	"testing"

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

func TestUserClassModifier(t *testing.T) {
	d, _ := New()
	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())
}