package iptools

import (
	"net/netip"
	"testing"
)

var (
	rangeTestIP1 = netip.AddrFrom4([4]byte{192, 168, 4, 3})
	rangeTestIP2 = netip.AddrFrom4([4]byte{192, 168, 4, 17})
)

func TestBasicValidation(t *testing.T) {
	r1 := &Range{
		Start: rangeTestIP1,
		End:   rangeTestIP2,
	}

	if err := r1.Validate(); err != nil {
		t.Fatalf("range 1 should be valid: %s", err)
	}

	r2 := &Range{
		Start: rangeTestIP2,
		End:   rangeTestIP1,
	}

	if r2.Validate() == nil {
		t.Fatal("range 2 should be invalid")
	}

	r3 := &Range{
		Start: netip.IPv6LinkLocalAllRouters(),
		End:   rangeTestIP1,
	}

	if r3.Validate() == nil {
		t.Fatal("range 3 should be invalid")
	}

	r4 := &Range{
		Start: rangeTestIP2,
		End:   netip.IPv6LinkLocalAllRouters(),
	}

	if r4.Validate() == nil {
		t.Fatal("range 4 should be invalid")
	}
}

func TestNumHosts(t *testing.T) {
	r := &Range{
		Start: rangeTestIP1,
		End:   rangeTestIP2,
	}
	expected := 15

	numHosts := r.numHosts()
	if numHosts != expected {
		t.Fatalf("have %d hosts, expected %d", numHosts, expected)
	}
}