package compare

import (
	"bytes"
	"fmt"

	"github.com/pmezard/go-difflib/difflib"

	// Force import protos
	_ "istio.io/istio/pilot/pkg/xds/filters"
	"istio.io/istio/pkg/util/protomarshal"
)

// ListenerDiff prints a diff between Istiod and Envoy listeners to the passed writer
func (c *Comparator) ListenerDiff() error {
	envoyBytes, istiodBytes := &bytes.Buffer{}, &bytes.Buffer{}

	}
	istiodClusterDump, err := c.istiod.GetDynamicClusterDump(true)
	if err != nil {
		istiodBytes.WriteString(err.Error())
	} else {
		istiod, err := protomarshal.ToJSONWithAnyResolver(istiodClusterDump, "    ", &envoyResolver)
		if err != nil {
			return err
		}
		istiodBytes.WriteString(istiod)
	}
	diff := difflib.UnifiedDiff{
		FromFile: "Istiod Clusters",

	"k8s.io/apimachinery/pkg/util/duration"

	"istio.io/istio/istioctl/pkg/multixds"
	"istio.io/istio/pilot/pkg/model"
	xdsresource "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pkg/log"
)

// XdsStatusWriter enables printing of sync status using multiple xdsapi.DiscoveryResponse Istiod responses
type XdsStatusWriter struct {
	Writer                 io.Writer

	cmdutil "k8s.io/kubectl/pkg/cmd/util"

	"istio.io/api/label"
	"istio.io/istio/istioctl/pkg/cli"
	"istio.io/istio/istioctl/pkg/clioptions"
	"istio.io/istio/istioctl/pkg/multixds"
	"istio.io/istio/istioctl/pkg/xds"
	"istio.io/istio/pkg/kube"
	"istio.io/istio/pkg/test/util/assert"
)

type execTestCase struct {
	args     []string
	revision string
	noIstiod bool

	// Typically use one of the three

	"github.com/spf13/viper"
)

// CentralControlPlaneOptions holds options common to all subcommands
// that invoke Istiod via xDS REST endpoint
type CentralControlPlaneOptions struct {
	// Xds is XDS endpoint, e.g. localhost:15010.
	Xds string

	// XdsPodLabel is a Kubernetes label on the Istiod pods
	XdsPodLabel string

	// XdsPodPort is a port exposing XDS (typically 15010 or 15012)
	XdsPodPort int

# Istio Agent

This document describes the internal architecture of Istio agent.

## High Level overview

![High Level overview](docs/overview.svg)

At a high level, the Istio agent acts as an intermediate proxy between Istiod and Envoy. This is done
at two levels. For distributing workload certificates, Envoy will send [SDS](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/secret)

10.244.0.176:15021                               HEALTHY                  outbound|15021||istio-ingressgateway.istio-system.svc.cluster.local
10.244.0.175:15017                               HEALTHY                  outbound|443||istiod.istio-system.svc.cluster.local
10.244.0.175:15010                               HEALTHY                  outbound|15010||istiod.istio-system.svc.cluster.local

metadata:
  labels:
    app: sidecar-injector
    install.operator.istio.io/owning-resource: unknown
    install.operator.istio.io/owning-resource-namespace: istio-system
    istio.io/rev: 1-16
    operator.istio.io/component: Pilot
    operator.istio.io/managed: Reconcile
    operator.istio.io/version: 1.16-alpha.91e471de3e8fc93ebb545cedf396ddbd550b996c
    release: istio
  name: istio-sidecar-injector-1-16
webhooks:
  - admissionReviewVersions:

                                        "metadata": {
                                            "filter_metadata": {
                                                "istio": {
                                                    "workload": "istio-ingressgateway;istio-system;istio-ingressgateway;latest;Kubernetes"
                                                }
                                            }
                                        },

# Architecture of Istiod

This document describes the high level architecture of the Istio control plane, Istiod.
Istiod is structured as a modular monolith, housing a wide range of functionality from certificate signing, proxy configuration (XDS), traditional Kubernetes controllers, and more.

## Proxy Configuration