"io"
	"strings"
	"text/tabwriter"

	adminv3 "github.com/envoyproxy/go-control-plane/envoy/admin/v3"
	"sigs.k8s.io/yaml"

	"istio.io/istio/istioctl/pkg/util/configdump"
	sdscompare "istio.io/istio/istioctl/pkg/writer/compare/sds"
	"istio.io/istio/pkg/util/protomarshal"
)

// ConfigWriter is a writer for processing responses from the Envoy Admin config_dump endpoint
type ConfigWriter struct {
	Stdout     io.Writer

	listener "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
	rbacpb "github.com/envoyproxy/go-control-plane/envoy/config/rbac/v3"
	rbachttp "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/rbac/v3"
	hcm "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/http_connection_manager/v3"
	rbactcp "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/rbac/v3"

)

// ClusterDiff prints a diff between Istiod and Envoy clusters to the passed writer
func (c *Comparator) ClusterDiff() error {
	envoyBytes, istiodBytes := &bytes.Buffer{}, &bytes.Buffer{}
	envoyClusterDump, err := c.envoy.GetDynamicClusterDump(true)
	if err != nil {
		envoyBytes.WriteString(err.Error())
	} else {
		envoy, err := protomarshal.ToJSONWithAnyResolver(envoyClusterDump, "    ", &envoyResolver)

                                  "factory_key": "envoy.string"
                                }
                              ]
                            }
                          },
                          {
                            "name": "envoy.filters.http.router",
                            "typed_config": {
                              "@type": "type.googleapis.com/envoy.extensions.filters.http.router.v3.Router"

// See https://www.envoyproxy.io/docs/envoy/latest/api-v3/admin/v3/config_dump.proto
const (
	bootstrap configTypeURL = "type.googleapis.com/envoy.admin.v3.BootstrapConfigDump"
	listeners configTypeURL = "type.googleapis.com/envoy.admin.v3.ListenersConfigDump"
	endpoints configTypeURL = "type.googleapis.com/envoy.admin.v3.EndpointsConfigDump"
	clusters  configTypeURL = "type.googleapis.com/envoy.admin.v3.ClustersConfigDump"

		Long: `
Retrieves last sent and last acknowledged xDS sync from Istiod to each Envoy in the mesh
`,
		Example: `  # Retrieve sync status for all Envoys in a mesh
  istioctl proxy-status

  # Retrieve sync status for Envoys in a specific namespace
  istioctl proxy-status --namespace foo

  # Retrieve sync diff for a single Envoy and Istiod

{
 "configs": [
  {
   "@type": "type.googleapis.com/envoy.admin.v3.RoutesConfigDump",
   "static_route_configs": [
    {
     "route_config": {
      "@type": "type.googleapis.com/envoy.config.route.v3.RouteConfiguration",
      "virtual_hosts": [
       {
        "name": "backend",
        "domains": [
         "*"
        ],
        "routes": [
         {
          "match": {
           "prefix": "/healthz/ready"
          },

)

// ListenerDiff prints a diff between Istiod and Envoy listeners to the passed writer
func (c *Comparator) ListenerDiff() error {
	envoyBytes, istiodBytes := &bytes.Buffer{}, &bytes.Buffer{}
	envoyListenerDump, err := c.envoy.GetDynamicListenerDump(true)
	if err != nil {
		envoyBytes.WriteString(err.Error())
	} else {
		envoy, err := protomarshal.ToJSONWithAnyResolver(envoyListenerDump, "    ", &envoyResolver)

		CommandLong:  `Open the Envoy admin dashboard for a sidecar`,
		CommandExample: `  # Open Envoy dashboard for the productpage-123-456.default pod
  istioctl dashboard envoy productpage-123-456.default

  # Open Envoy dashboard for one pod under a deployment
  istioctl dashboard envoy deployment/productpage-v1

  # with short syntax
  istioctl dash envoy productpage-123-456.default
  istioctl d envoy productpage-123-456.default
`,

at two levels. For distributing workload certificates, Envoy will send [SDS](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/secret)
requests to the agent, causing the agent to submit a CSR to the configured CA (generally Istiod). For other configuration,