"istio.io/istio/pkg/test/framework/resource"
	"istio.io/istio/pkg/test/scopes"
)

// Environment is the implementation of a kubernetes environment. It implements environment.Environment,
// and also hosts publicly accessible methods that are specific to cluster environment.
type Environment struct {
	id       resource.ID
	ctx      resource.Context
	clusters []cluster.Cluster
	s        *Settings
}

// to minor).
//
// A valid TopologyProto must have:
//  - a valid mesh shape (rank 4 with positive dimensions)
//  - `num_tasks` and `num_tpu_devices_per_task` must match the number of
//    available TPU hosts and devices per host
//  - device coordinates within the mesh shape
//  - no duplicate device coordinates
//  - number of device coordinates (in tuple 3) match number of availabe TPUs

const (
	dotdotComponent = ".."
	dotComponent    = "."
)

func hasBadHost(host string) error {
	if globalIsCICD && strings.TrimSpace(host) == "" {
		// under CI/CD test setups ignore empty hosts as invalid hosts
		return nil
	}
	_, err := xnet.ParseHost(host)
	return err
}

// Check if the incoming path has bad path components,
// such as ".." and "."
func hasBadPathComponent(path string) bool {

				"istiod-remote.istio-system.svc",
				"istiod.istio-system.svc",
				"istiod.istio-system.svc.cluster.local",
			},
		},
		{
			name:             "customHost has duplicate hosts with inner default",
			customHost:       "a.com,b.com,c.com,istiod",
			discoveryAddress: "istiod.istio-system.svc.cluster.local",
			revision:         "canary",
			sans: []string{
				"a.com", "b.com", "c.com",

}

// TODO(#14217)
// As part of the Volume Host refactor we are starting to create Volume Hosts
// for specific hosts. New methods for each specific host can be added here.
// Currently consumers will do type assertions to get the specific type of Volume
// Host; however, the end result should be that specific Volume Hosts are passed
// to the specific functions they are needed in (instead of using a catch-all
// VolumeHost interface)

func getDNSNames(args *PilotArgs, host string) []string {
	// Append custom hostname if there is any
	customHost := features.IstiodServiceCustomHost
	var cHosts []string

	if customHost != "" {
		cHosts = strings.Split(customHost, ",")
	}
	sans := sets.New(cHosts...)
	sans.Insert(host)
	// The first is the recommended one, also used by Apiserver for webhooks.
	// add a few known hostnames

# Images should be pushed to staging-k8s.gcr.io.
PUSH_REGISTRY?=staging-k8s.gcr.io

MANIFEST_IMAGE := $(PUSH_REGISTRY)/etcd

# Install binaries matching base distro permissions
BIN_INSTALL := install -m 0555

# Hosts running SELinux need :z added to volume mounts
SELINUX_ENABLED := $(shell cat /sys/fs/selinux/enforce 2> /dev/null || echo 0)

ifeq ($(SELINUX_ENABLED),1)
  DOCKER_VOL_OPTS?=:z
endif

type clusterWrapper struct {
	cluster *cluster.Cluster
	// httpProtocolOptions stores the HttpProtocolOptions which will be marshaled when build is called.
	httpProtocolOptions *http.HttpProtocolOptions
}

// metadataCerts hosts client certificate related metadata specified in proxy metadata.
type metadataCerts struct {
	// tlsClientCertChain is the absolute path to client cert-chain file
	tlsClientCertChain string

		"If true, Pilot will collect metrics for envoy filter operations.").Get()

	EnableRouteCollapse = env.Register("PILOT_ENABLE_ROUTE_COLLAPSE_OPTIMIZATION", true,
		"If true, Pilot will merge virtual hosts with the same routes into a single virtual host, as an optimization.").Get()

	MulticlusterHeadlessEnabled = env.Register("ENABLE_MULTICLUSTER_HEADLESS", true,

	}
}

func withClusterLocalHosts(m *meshconfig.MeshConfig, hosts ...string) *meshconfig.MeshConfig { // nolint:interfacer
	m.ServiceSettings = append(append(make([]*meshconfig.MeshConfig_ServiceSettings, 0), m.ServiceSettings...),
		&meshconfig.MeshConfig_ServiceSettings{
			Settings: &meshconfig.MeshConfig_ServiceSettings_Settings{
				ClusterLocal: true,
			},
			Hosts: hosts,
		})
	return m
}