import (
	"errors"
	"fmt"
	"path/filepath"
	"runtime"
	"sync"

	corev1 "k8s.io/api/core/v1"

	"istio.io/istio/pkg/maps"
	"istio.io/istio/pkg/zdsapi"
)

var ErrPodNotFound = errors.New("netns not provided, but is needed as pod is not in cache")

type PodNetnsCache interface {
	ReadCurrentPodSnapshot() map[string]WorkloadInfo
}

// Hold a cache of node local pods with their netns

)

// getNs is a unit test override variable for interface create.
var getNs = ns.GetNS

// Program defines a method which programs iptables based on the parameters
// provided in Redirect.
func (ipt *iptables) Program(podName, netns string, rdrct *Redirect) error {
	cfg := config.DefaultConfig()
	cfg.CNIMode = true
	cfg.NetworkNamespace = netns
	cfg.ProxyPort = rdrct.targetPort

// NewSDSWriter generates a new instance which conforms to SDSWriter interface
func NewSDSWriter(w io.Writer, format Format) SDSWriter {
	return &sdsWriter{
		w:      w,
		output: format,
	}
}

// sdsWriter is provided concrete implementation of SDSWriter
type sdsWriter struct {
	w      io.Writer
	output Format
}

// PrintSecretItems uses the user supplied output format to determine how to display the diffed secrets

package manifests

import (
	"embed"
	"io/fs"
	"os"
)

// FS embeds the manifests
//
//go:embed all:charts/* profiles/*
var FS embed.FS

// BuiltinOrDir returns a FS for the provided directory. If no directory is passed, the compiled in
// FS will be used
func BuiltinOrDir(dir string) fs.FS {
	if dir == "" {
		return FS
	}
	return os.DirFS(dir)

				c.Println(c.UsageString())
				return fmt.Errorf("specify a pod or --selector")
			}

			if labelSelector != "" && len(args) > 0 {
				c.Println(c.UsageString())
				return fmt.Errorf("name cannot be provided when a selector is specified")
			}

			if err != nil {
				return fmt.Errorf("failed to create k8s client: %v", err)
			}

			var podName, ns string
			if labelSelector != "" {

		l.LogAndFatal(err)
	}

	// create watched namespaces
	namespaces := strings.Split(oiArgs.common.watchedNamespaces, ",")
	// if the namespace in the CR is provided, consider creating it too.
	if istioNamespace != "" {
		namespaces = append(namespaces, istioNamespace)
	}
	for _, ns := range namespaces {

		repairLog.Fatalf("Fatal error constructing repair controller: %+v", err)
	}
	go rc.Run(ctx.Done())
	client.RunAndWait(ctx.Done())
}

// Set up Kubernetes client using kubeconfig (or in-cluster config if no file provided)
func clientSetup() (kube.Client, error) {
	config, err := kube.DefaultRestConfig("", "")
	if err != nil {
		return nil, err
	}
	return kube.NewClient(kube.NewClientConfigForRestConfig(config), "")

			WantException:  true,
		},
		{ // case 12
			Args:           strings.Split("envoy --browser=false --selector app=example pod-123456-7890", " "),
			ExpectedRegexp: regexp.MustCompile(".*Error: name cannot be provided when a selector is specified"),
			WantException:  true,
		},
		{ // case 13
			Args:           strings.Split("--browser=false controlz --selector app=example", " "),
			ExpectedRegexp: regexp.MustCompile(".*no pods found"),

// ErrNotImplemented is returned when a requested feature is not implemented.
var ErrNotImplemented = errors.New("not implemented")

// Program defines a method which programs iptables based on the parameters
// provided in Redirect.
func (ipt *iptables) Program(podName, netns string, rdrct *Redirect) error {
	return ErrNotImplemented

		if waypointName == "" {
			waypointName = constants.DefaultNamespaceWaypoint
		} else if waypointName == "none" {
			return nil, fmt.Errorf("invalid name provided for waypoint, 'none' is a reserved value")
		}
		gw := gateway.Gateway{
			TypeMeta: metav1.TypeMeta{
				Kind:       gvk.KubernetesGateway_v1.Kind,
				APIVersion: gvk.KubernetesGateway_v1.GroupVersion(),
			},