// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package retail

import (
	"bytes"
	"context"
	"fmt"
	"log/slog"
	"math"
	"net/http"
	"net/url"
	"time"

	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
	retailpb "cloud.google.com/go/retail/apiv2alpha/retailpb"
	gax "github.com/googleapis/gax-go/v2"
	"github.com/googleapis/gax-go/v2/callctx"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	httptransport "google.golang.org/api/transport/http"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

var newControlClientHook clientHook

// ControlCallOptions contains the retry settings for each method of ControlClient.
type ControlCallOptions struct {
	CreateControl  []gax.CallOption
	DeleteControl  []gax.CallOption
	UpdateControl  []gax.CallOption
	GetControl     []gax.CallOption
	ListControls   []gax.CallOption
	GetOperation   []gax.CallOption
	ListOperations []gax.CallOption
}

func defaultControlGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("retail.googleapis.com:443"),
		internaloption.WithDefaultEndpointTemplate("retail.UNIVERSE_DOMAIN:443"),
		internaloption.WithDefaultMTLSEndpoint("retail.mtls.googleapis.com:443"),
		internaloption.WithDefaultUniverseDomain("googleapis.com"),
		internaloption.WithDefaultAudience("https://retail.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableJwtWithScope(),
		internaloption.EnableNewAuthLibrary(),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultControlCallOptions() *ControlCallOptions {
	return &ControlCallOptions{
		CreateControl: []gax.CallOption{},
		DeleteControl: []gax.CallOption{},
		UpdateControl: []gax.CallOption{},
		GetControl:    []gax.CallOption{},
		ListControls:  []gax.CallOption{},
		GetOperation:  []gax.CallOption{},
		ListOperations: []gax.CallOption{
			gax.WithTimeout(300000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        300000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

func defaultControlRESTCallOptions() *ControlCallOptions {
	return &ControlCallOptions{
		CreateControl: []gax.CallOption{},
		DeleteControl: []gax.CallOption{},
		UpdateControl: []gax.CallOption{},
		GetControl:    []gax.CallOption{},
		ListControls:  []gax.CallOption{},
		GetOperation:  []gax.CallOption{},
		ListOperations: []gax.CallOption{
			gax.WithTimeout(300000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        300000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
	}
}

// internalControlClient is an interface that defines the methods available from Vertex AI Search for commerce API.
type internalControlClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CreateControl(context.Context, *retailpb.CreateControlRequest, ...gax.CallOption) (*retailpb.Control, error)
	DeleteControl(context.Context, *retailpb.DeleteControlRequest, ...gax.CallOption) error
	UpdateControl(context.Context, *retailpb.UpdateControlRequest, ...gax.CallOption) (*retailpb.Control, error)
	GetControl(context.Context, *retailpb.GetControlRequest, ...gax.CallOption) (*retailpb.Control, error)
	ListControls(context.Context, *retailpb.ListControlsRequest, ...gax.CallOption) *ControlIterator
	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
}

// ControlClient is a client for interacting with Vertex AI Search for commerce API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// Service for modifying Control.
type ControlClient struct {
	// The internal transport-dependent client.
	internalClient internalControlClient

	// The call options for this service.
	CallOptions *ControlCallOptions
}

// Wrapper methods routed to the internal client.

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *ControlClient) Close() error {
	return c.internalClient.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *ControlClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *ControlClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// CreateControl creates a Control.
//
// If the Control to create already
// exists, an ALREADY_EXISTS error is returned.
func (c *ControlClient) CreateControl(ctx context.Context, req *retailpb.CreateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	return c.internalClient.CreateControl(ctx, req, opts...)
}

// DeleteControl deletes a Control.
//
// If the Control to delete does not
// exist, a NOT_FOUND error is returned.
func (c *ControlClient) DeleteControl(ctx context.Context, req *retailpb.DeleteControlRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteControl(ctx, req, opts...)
}

// UpdateControl updates a Control.
//
// Control cannot be set to a different
// oneof field, if so an INVALID_ARGUMENT is returned. If the
// Control to update does not exist, a
// NOT_FOUND error is returned.
func (c *ControlClient) UpdateControl(ctx context.Context, req *retailpb.UpdateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	return c.internalClient.UpdateControl(ctx, req, opts...)
}

// GetControl gets a Control.
func (c *ControlClient) GetControl(ctx context.Context, req *retailpb.GetControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	return c.internalClient.GetControl(ctx, req, opts...)
}

// ListControls lists all Controls by their parent
// Catalog.
func (c *ControlClient) ListControls(ctx context.Context, req *retailpb.ListControlsRequest, opts ...gax.CallOption) *ControlIterator {
	return c.internalClient.ListControls(ctx, req, opts...)
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *ControlClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	return c.internalClient.GetOperation(ctx, req, opts...)
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *ControlClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	return c.internalClient.ListOperations(ctx, req, opts...)
}

// controlGRPCClient is a client for interacting with Vertex AI Search for commerce API over gRPC transport.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type controlGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// Points back to the CallOptions field of the containing ControlClient
	CallOptions **ControlCallOptions

	// The gRPC API client.
	controlClient retailpb.ControlServiceClient

	operationsClient longrunningpb.OperationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogHeaders []string

	logger *slog.Logger
}

// NewControlClient creates a new control service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service for modifying Control.
func NewControlClient(ctx context.Context, opts ...option.ClientOption) (*ControlClient, error) {
	clientOpts := defaultControlGRPCClientOptions()
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		clientOpts = append(clientOpts, internaloption.WithTelemetryAttributes(map[string]string{
			"gcp.client.service":  "retail",
			"gcp.client.version":  getVersionClient(),
			"gcp.client.repo":     "googleapis/google-cloud-go",
			"gcp.client.artifact": "cloud.google.com/go/retail/apiv2alpha",
			"gcp.client.language": "go",
			"url.domain":          "retail.googleapis.com",
		}))
	}
	if newControlClientHook != nil {
		hookOpts, err := newControlClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := ControlClient{CallOptions: defaultControlCallOptions()}

	c := &controlGRPCClient{
		connPool:         connPool,
		controlClient:    retailpb.NewControlServiceClient(connPool),
		CallOptions:      &client.CallOptions,
		logger:           internaloption.GetLogger(opts),
		operationsClient: longrunningpb.NewOperationsClient(connPool),
	}
	c.setGoogleClientInfo()
	if gax.IsFeatureEnabled("METRICS") {
		metrics := gax.NewClientMetrics(
			gax.WithTelemetryLogger(c.logger),
			gax.WithTelemetryAttributes(map[string]string{
				gax.ClientService:  "retail",
				gax.ClientVersion:  getVersionClient(),
				gax.ClientArtifact: "cloud.google.com/go/retail/apiv2alpha",
				gax.RPCSystem:      "grpc",
				gax.URLDomain:      "retail.googleapis.com",
			}),
		)

		client.CallOptions.CreateControl = append(client.CallOptions.CreateControl, gax.WithClientMetrics(metrics))
		client.CallOptions.DeleteControl = append(client.CallOptions.DeleteControl, gax.WithClientMetrics(metrics))
		client.CallOptions.UpdateControl = append(client.CallOptions.UpdateControl, gax.WithClientMetrics(metrics))
		client.CallOptions.GetControl = append(client.CallOptions.GetControl, gax.WithClientMetrics(metrics))
		client.CallOptions.ListControls = append(client.CallOptions.ListControls, gax.WithClientMetrics(metrics))
		client.CallOptions.GetOperation = append(client.CallOptions.GetOperation, gax.WithClientMetrics(metrics))
		client.CallOptions.ListOperations = append(client.CallOptions.ListOperations, gax.WithClientMetrics(metrics))
	}

	client.internalClient = c

	return &client, nil
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *controlGRPCClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *controlGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version, "pb", protoVersion)
	c.xGoogHeaders = []string{
		"x-goog-api-client", gax.XGoogHeader(kv...),
	}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *controlGRPCClient) Close() error {
	return c.connPool.Close()
}

// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type controlRESTClient struct {
	// The http endpoint to connect to.
	endpoint string

	// The http client.
	httpClient *http.Client

	// The x-goog-* headers to be sent with each request.
	xGoogHeaders []string

	// Points back to the CallOptions field of the containing ControlClient
	CallOptions **ControlCallOptions

	logger *slog.Logger
}

// NewControlRESTClient creates a new control service rest client.
//
// Service for modifying Control.
func NewControlRESTClient(ctx context.Context, opts ...option.ClientOption) (*ControlClient, error) {
	clientOpts := append(defaultControlRESTClientOptions(), opts...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		clientOpts = append(clientOpts, internaloption.WithTelemetryAttributes(map[string]string{
			"gcp.client.service":  "retail",
			"gcp.client.version":  getVersionClient(),
			"gcp.client.repo":     "googleapis/google-cloud-go",
			"gcp.client.artifact": "cloud.google.com/go/retail/apiv2alpha",
			"gcp.client.language": "go",
			"url.domain":          "retail.googleapis.com",
		}))
	}
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultControlRESTCallOptions()
	c := &controlRESTClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
		logger:      internaloption.GetLogger(opts),
	}
	c.setGoogleClientInfo()

	if gax.IsFeatureEnabled("METRICS") {
		metrics := gax.NewClientMetrics(
			gax.WithTelemetryLogger(c.logger),
			gax.WithTelemetryAttributes(map[string]string{
				gax.ClientService:  "retail",
				gax.ClientVersion:  getVersionClient(),
				gax.ClientArtifact: "cloud.google.com/go/retail/apiv2alpha",
				gax.RPCSystem:      "http",
				gax.URLDomain:      "retail.googleapis.com",
			}),
		)

		callOpts.CreateControl = append(callOpts.CreateControl, gax.WithClientMetrics(metrics))
		callOpts.DeleteControl = append(callOpts.DeleteControl, gax.WithClientMetrics(metrics))
		callOpts.UpdateControl = append(callOpts.UpdateControl, gax.WithClientMetrics(metrics))
		callOpts.GetControl = append(callOpts.GetControl, gax.WithClientMetrics(metrics))
		callOpts.ListControls = append(callOpts.ListControls, gax.WithClientMetrics(metrics))
		callOpts.GetOperation = append(callOpts.GetOperation, gax.WithClientMetrics(metrics))
		callOpts.ListOperations = append(callOpts.ListOperations, gax.WithClientMetrics(metrics))
	}

	return &ControlClient{internalClient: c, CallOptions: callOpts}, nil
}

func defaultControlRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://retail.googleapis.com"),
		internaloption.WithDefaultEndpointTemplate("https://retail.UNIVERSE_DOMAIN"),
		internaloption.WithDefaultMTLSEndpoint("https://retail.mtls.googleapis.com"),
		internaloption.WithDefaultUniverseDomain("googleapis.com"),
		internaloption.WithDefaultAudience("https://retail.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableNewAuthLibrary(),
	}
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *controlRESTClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN", "pb", protoVersion)
	c.xGoogHeaders = []string{
		"x-goog-api-client", gax.XGoogHeader(kv...),
	}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *controlRESTClient) Close() error {
	// Replace httpClient with nil to force cleanup.
	c.httpClient = nil
	return nil
}

// Connection returns a connection to the API service.
//
// Deprecated: This method always returns nil.
func (c *controlRESTClient) Connection() *grpc.ClientConn {
	return nil
}
func (c *controlGRPCClient) CreateControl(ctx context.Context, req *retailpb.CreateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/CreateControl")
	}
	opts = append((*c.CallOptions).CreateControl[0:len((*c.CallOptions).CreateControl):len((*c.CallOptions).CreateControl)], opts...)
	var resp *retailpb.Control
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.controlClient.CreateControl, req, settings.GRPC, c.logger, "CreateControl")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *controlGRPCClient) DeleteControl(ctx context.Context, req *retailpb.DeleteControlRequest, opts ...gax.CallOption) error {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/DeleteControl")
	}
	opts = append((*c.CallOptions).DeleteControl[0:len((*c.CallOptions).DeleteControl):len((*c.CallOptions).DeleteControl)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = executeRPC(ctx, c.controlClient.DeleteControl, req, settings.GRPC, c.logger, "DeleteControl")
		return err
	}, opts...)
	return err
}

func (c *controlGRPCClient) UpdateControl(ctx context.Context, req *retailpb.UpdateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "control.name", url.QueryEscape(req.GetControl().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/UpdateControl")
	}
	opts = append((*c.CallOptions).UpdateControl[0:len((*c.CallOptions).UpdateControl):len((*c.CallOptions).UpdateControl)], opts...)
	var resp *retailpb.Control
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.controlClient.UpdateControl, req, settings.GRPC, c.logger, "UpdateControl")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *controlGRPCClient) GetControl(ctx context.Context, req *retailpb.GetControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/GetControl")
	}
	opts = append((*c.CallOptions).GetControl[0:len((*c.CallOptions).GetControl):len((*c.CallOptions).GetControl)], opts...)
	var resp *retailpb.Control
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.controlClient.GetControl, req, settings.GRPC, c.logger, "GetControl")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *controlGRPCClient) ListControls(ctx context.Context, req *retailpb.ListControlsRequest, opts ...gax.CallOption) *ControlIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/ListControls")
	}
	opts = append((*c.CallOptions).ListControls[0:len((*c.CallOptions).ListControls):len((*c.CallOptions).ListControls)], opts...)
	it := &ControlIterator{}
	req = proto.CloneOf(req)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*retailpb.Control, string, error) {
		resp := &retailpb.ListControlsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = executeRPC(ctx, c.controlClient.ListControls, req, settings.GRPC, c.logger, "ListControls")
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetControls(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *controlGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/GetOperation")
	}
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.operationsClient.GetOperation, req, settings.GRPC, c.logger, "GetOperation")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *controlGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/ListOperations")
	}
	opts = append((*c.CallOptions).ListOperations[0:len((*c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
	it := &OperationIterator{}
	req = proto.CloneOf(req)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
		resp := &longrunningpb.ListOperationsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = executeRPC(ctx, c.operationsClient.ListOperations, req, settings.GRPC, c.logger, "ListOperations")
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetOperations(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

// CreateControl creates a Control.
//
// If the Control to create already
// exists, an ALREADY_EXISTS error is returned.
func (c *controlRESTClient) CreateControl(ctx context.Context, req *retailpb.CreateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetControl()
	jsonReq, err := m.Marshal(body)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v/controls", req.GetParent())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	params.Add("controlId", fmt.Sprintf("%v", req.GetControlId()))

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/CreateControl")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v2alpha/{parent=projects/*/locations/*/catalogs/*}/controls")
	}
	opts = append((*c.CallOptions).CreateControl[0:len((*c.CallOptions).CreateControl):len((*c.CallOptions).CreateControl)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.Control{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "CreateControl")
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// DeleteControl deletes a Control.
//
// If the Control to delete does not
// exist, a NOT_FOUND error is returned.
func (c *controlRESTClient) DeleteControl(ctx context.Context, req *retailpb.DeleteControlRequest, opts ...gax.CallOption) error {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/DeleteControl")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v2alpha/{name=projects/*/locations/*/catalogs/*/controls/*}")
	}
	return gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("DELETE", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		_, err = executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "DeleteControl")
		return err
	}, opts...)
}

// UpdateControl updates a Control.
//
// Control cannot be set to a different
// oneof field, if so an INVALID_ARGUMENT is returned. If the
// Control to update does not exist, a
// NOT_FOUND error is returned.
func (c *controlRESTClient) UpdateControl(ctx context.Context, req *retailpb.UpdateControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetControl()
	jsonReq, err := m.Marshal(body)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetControl().GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	if req.GetUpdateMask() != nil {
		field, err := protojson.Marshal(req.GetUpdateMask())
		if err != nil {
			return nil, err
		}
		params.Add("updateMask", string(field[1:len(field)-1]))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "control.name", url.QueryEscape(req.GetControl().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/UpdateControl")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v2alpha/{control.name=projects/*/locations/*/catalogs/*/controls/*}")
	}
	opts = append((*c.CallOptions).UpdateControl[0:len((*c.CallOptions).UpdateControl):len((*c.CallOptions).UpdateControl)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.Control{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("PATCH", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "UpdateControl")
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// GetControl gets a Control.
func (c *controlRESTClient) GetControl(ctx context.Context, req *retailpb.GetControlRequest, opts ...gax.CallOption) (*retailpb.Control, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//retail.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.retail.v2alpha.ControlService/GetControl")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v2alpha/{name=projects/*/locations/*/catalogs/*/controls/*}")
	}
	opts = append((*c.CallOptions).GetControl[0:len((*c.CallOptions).GetControl):len((*c.CallOptions).GetControl)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.Control{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "GetControl")
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// ListControls lists all Controls by their parent
// Catalog.
func (c *controlRESTClient) ListControls(ctx context.Context, req *retailpb.ListControlsRequest, opts ...gax.CallOption) *ControlIterator {
	it := &ControlIterator{}
	req = proto.CloneOf(req)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*retailpb.Control, string, error) {
		resp := &retailpb.ListControlsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v2alpha/%v/controls", req.GetParent())

		params := url.Values{}
		params.Add("$alt", "json;enum-encoding=int")
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
		headers := gax.BuildHeaders(ctx, hds...)
		e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			if settings.Path != "" {
				baseUrl.Path = settings.Path
			}
			httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
			if err != nil {
				return err
			}
			httpReq.Header = headers

			buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "ListControls")
			if err != nil {
				return err
			}
			if err := unm.Unmarshal(buf, resp); err != nil {
				return err
			}

			return nil
		}, opts...)
		if e != nil {
			return nil, "", e
		}
		it.Response = resp
		return resp.GetControls(), resp.GetNextPageToken(), nil
	}

	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *controlRESTClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/GetOperation")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v2alpha/{name=projects/*/locations/*/catalogs/*/branches/*/operations/*}")
	}
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "GetOperation")
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return err
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *controlRESTClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	it := &OperationIterator{}
	req = proto.CloneOf(req)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
		resp := &longrunningpb.ListOperationsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v2alpha/%v/operations", req.GetName())

		params := url.Values{}
		params.Add("$alt", "json;enum-encoding=int")
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}
		if req.GetReturnPartialSuccess() {
			params.Add("returnPartialSuccess", fmt.Sprintf("%v", req.GetReturnPartialSuccess()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
		headers := gax.BuildHeaders(ctx, hds...)
		e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			if settings.Path != "" {
				baseUrl.Path = settings.Path
			}
			httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
			if err != nil {
				return err
			}
			httpReq.Header = headers

			buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "ListOperations")
			if err != nil {
				return err
			}
			if err := unm.Unmarshal(buf, resp); err != nil {
				return err
			}

			return nil
		}, opts...)
		if e != nil {
			return nil, "", e
		}
		it.Response = resp
		return resp.GetOperations(), resp.GetNextPageToken(), nil
	}

	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}
