import "io"

type NetnsFd interface {
	Fd() uintptr
}

type Netns interface {
	NetnsFd
	Inode() uint64
}
type NetnsCloser interface {
	io.Closer
	Netns
}

type NetnsWithFd struct {
	netns io.Closer
	fd    uintptr
	inode uint64
}

func (n *NetnsWithFd) Close() error {
	if n.netns == nil {
		return nil
	}

	ret := n.netns.Close()

	return "/host/proc/" + strconv.Itoa(pid) + "/ns/net"
}

func runInHost[T any](f func() (T, error)) (T, error) {
	var res T
	ns, err := netns.GetNS(getPidNamespace(1))
	if err != nil {
		return res, fmt.Errorf("failed to get host network: %v", err)
	}
	err = ns.Do(func(ns netns.NetNS) error {
		var err error
		res, err = f()
		return err
	})
	if err != nil {
		return res, fmt.Errorf("in host network: %v", err)
	}

// limitations under the License.

package nodeagent

import (
	"fmt"
	"runtime"
	"sync"

	netns "github.com/containernetworking/plugins/pkg/ns"
	"golang.org/x/sys/unix"
)

type NetnsWrapper struct {
	innerNetns netns.NetNS
	inode      uint64
}

func (n *NetnsWrapper) Inode() uint64 {
	return n.inode
}

func (n *NetnsWrapper) Close() error {

}

func NetnsSet(n NetnsFd) error {
	return errors.New("not implemented")
}

func OpenNetns(nspath string) (NetnsCloser, error) {
	return nil, errors.New("not implemented")
}

// inspired by netns.Do() but with an existing fd.
func NetnsDo(fdable NetnsFd, toRun func() error) error {
	return errors.New("not implemented")

package nodeagent

import "testing"

func TestOpenNetns(t *testing.T) {
	ns, err := OpenNetns("/proc/self/ns/net")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	// the inode for netns is proc dynamic, so it needs to be higher than
	// #define PROC_DYNAMIC_FIRST 0xF0000000U

	if ns.Inode() < 0xF0000000 {
		t.Fatalf("unexpected inode: %v", ns.Inode())
	}
	defer ns.Close()

	nspath1 := "/path/to/netns/1"
	nspath2 := "/path/to/netns/2"

	netns1, err := p.UpsertPodCache(pod, nspath1)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	netns2, err := p.UpsertPodCache(pod, nspath2)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if !reflect.DeepEqual(netns1, netns2) {
		t.Fatalf("Expected the same Netns for the same uid, got %v and %v", netns1, netns2)

	cfg.DualStack = rdrct.dualStack
	if err := cfg.FillConfigFromEnvironment(); err != nil {
		return err
	}

	netNs, err := getNs(netns)
	if err != nil {
		err = fmt.Errorf("failed to open netns %q: %s", netns, err)
		return err
	}
	defer netNs.Close()

	return netNs.Do(func(_ ns.NetNS) error {
		log.Infof("============= Start iptables configuration for %v =============", podName)

	if existing := p.currentPodCache[uid]; existing.Netns != nil {
		if existing.Netns.Inode() == workload.Netns.Inode() {
			workload.Netns.Close()
			// Replace the workload, but keep the old Netns
			p.currentPodCache[uid] = WorkloadInfo{
				Workload: workload.Workload,
				Netns:    existing.Netns,
			}
			// already in cache
			return existing.Netns
		}
		log.Debug("netns inode mismatch, using the new one")
	}

	assert.Equal(t, nlDeps.DelLoopbackRoutesCnt.Load(), 1)
	// make sure the uid was taken from cache and netns closed
	netns := fixture.podNsMap.Take(string(pod.UID))
	assert.Equal(t, nil, netns)

	// run gc to clean up ns:

	//revive:disable-next-line:call-to-gc Just a test that we are cleaning up the netns
	runtime.GC()
	assertNSClosed(t, closed)
}

func TestServerDeletePod(t *testing.T) {

	netns, err := runInHost(func() (string, error) { return getPodNetNs(pod) })
	if err != nil {
		m.With(resultLabel.Value(resultFail)).Increment()
		return fmt.Errorf("get netns: %v", err)
	}
	log = log.WithLabels("netns", netns)

	if err := redirectRunningPod(pod, netns); err != nil {
		log.Errorf("failed to setup redirection: %v", err)