//go:build !linux || android

package routemanager

import (
	"net"
	"net/netip"
	"testing"

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

func TestIsSubRange(t *testing.T) {
	addresses, err := net.InterfaceAddrs()
	if err != nil {
		t.Fatal("shouldn't return error when fetching interface addresses: ", err)
	}

	var subRangeAddressPrefixes []netip.Prefix
	var nonSubRangeAddressPrefixes []netip.Prefix
	for _, address := range addresses {
		p := netip.MustParsePrefix(address.String())
		if !p.Addr().IsLoopback() && p.Addr().Is4() && p.Bits() < 32 {
			p2 := netip.PrefixFrom(p.Masked().Addr(), p.Bits()+1)
			subRangeAddressPrefixes = append(subRangeAddressPrefixes, p2)
			nonSubRangeAddressPrefixes = append(nonSubRangeAddressPrefixes, p.Masked())
		}
	}

	for _, prefix := range subRangeAddressPrefixes {
		isSubRangePrefix, err := isSubRange(prefix)
		if err != nil {
			t.Fatal("shouldn't return error when checking if address is sub-range: ", err)
		}
		if !isSubRangePrefix {
			t.Fatalf("address %s should be sub-range of an existing route in the table", prefix)
		}
	}

	for _, prefix := range nonSubRangeAddressPrefixes {
		isSubRangePrefix, err := isSubRange(prefix)
		if err != nil {
			t.Fatal("shouldn't return error when checking if address is sub-range: ", err)
		}
		if isSubRangePrefix {
			t.Fatalf("address %s should not be sub-range of an existing route in the table", prefix)
		}
	}
}

func TestExistsInRouteTable(t *testing.T) {
	require.NoError(t, setupRouting())
	t.Cleanup(func() {
		assert.NoError(t, cleanupRouting())
	})

	addresses, err := net.InterfaceAddrs()
	if err != nil {
		t.Fatal("shouldn't return error when fetching interface addresses: ", err)
	}

	var addressPrefixes []netip.Prefix
	for _, address := range addresses {
		p := netip.MustParsePrefix(address.String())
		if p.Addr().Is4() {
			addressPrefixes = append(addressPrefixes, p.Masked())
		}
	}

	for _, prefix := range addressPrefixes {
		exists, err := existsInRouteTable(prefix)
		if err != nil {
			t.Fatal("shouldn't return error when checking if address exists in route table: ", err)
		}
		if !exists {
			t.Fatalf("address %s should exist in route table", prefix)
		}
	}
}