// Copyright 2020 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 notebooks

import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	"github.com/golang/protobuf/proto"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	gtransport "google.golang.org/api/transport/grpc"
	notebookspb "google.golang.org/genproto/googleapis/cloud/notebooks/v1beta1"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/metadata"
)

var newNotebookClientHook clientHook

// NotebookCallOptions contains the retry settings for each method of NotebookClient.
type NotebookCallOptions struct {
	ListInstances           []gax.CallOption
	GetInstance             []gax.CallOption
	CreateInstance          []gax.CallOption
	RegisterInstance        []gax.CallOption
	SetInstanceAccelerator  []gax.CallOption
	SetInstanceMachineType  []gax.CallOption
	SetInstanceLabels       []gax.CallOption
	DeleteInstance          []gax.CallOption
	StartInstance           []gax.CallOption
	StopInstance            []gax.CallOption
	ResetInstance           []gax.CallOption
	ReportInstanceInfo      []gax.CallOption
	IsInstanceUpgradeable   []gax.CallOption
	UpgradeInstance         []gax.CallOption
	UpgradeInstanceInternal []gax.CallOption
	ListEnvironments        []gax.CallOption
	GetEnvironment          []gax.CallOption
	CreateEnvironment       []gax.CallOption
	DeleteEnvironment       []gax.CallOption
}

func defaultNotebookClientOptions() []option.ClientOption {
	return []option.ClientOption{
		option.WithEndpoint("notebooks.googleapis.com:443"),
		option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
		option.WithScopes(DefaultAuthScopes()...),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultNotebookCallOptions() *NotebookCallOptions {
	return &NotebookCallOptions{
		ListInstances:           []gax.CallOption{},
		GetInstance:             []gax.CallOption{},
		CreateInstance:          []gax.CallOption{},
		RegisterInstance:        []gax.CallOption{},
		SetInstanceAccelerator:  []gax.CallOption{},
		SetInstanceMachineType:  []gax.CallOption{},
		SetInstanceLabels:       []gax.CallOption{},
		DeleteInstance:          []gax.CallOption{},
		StartInstance:           []gax.CallOption{},
		StopInstance:            []gax.CallOption{},
		ResetInstance:           []gax.CallOption{},
		ReportInstanceInfo:      []gax.CallOption{},
		IsInstanceUpgradeable:   []gax.CallOption{},
		UpgradeInstance:         []gax.CallOption{},
		UpgradeInstanceInternal: []gax.CallOption{},
		ListEnvironments:        []gax.CallOption{},
		GetEnvironment:          []gax.CallOption{},
		CreateEnvironment:       []gax.CallOption{},
		DeleteEnvironment:       []gax.CallOption{},
	}
}

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

	// The gRPC API client.
	notebookClient notebookspb.NotebookServiceClient

	// LROClient is used internally to handle longrunning operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient

	// The call options for this service.
	CallOptions *NotebookCallOptions

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewNotebookClient creates a new notebook service client.
//
// API service for Cloud AI Platform Notebooks.
func NewNotebookClient(ctx context.Context, opts ...option.ClientOption) (*NotebookClient, error) {
	clientOpts := defaultNotebookClientOptions()

	if newNotebookClientHook != nil {
		hookOpts, err := newNotebookClientHook(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
	}
	c := &NotebookClient{
		connPool:    connPool,
		CallOptions: defaultNotebookCallOptions(),

		notebookClient: notebookspb.NewNotebookServiceClient(connPool),
	}
	c.setGoogleClientInfo()

	c.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
		// This error "should not happen", since we are just reusing old connection pool
		// and never actually need to dial.
		// If this does happen, we could leak connp. However, we cannot close conn:
		// If the user invoked the constructor with option.WithGRPCConn,
		// we would close a connection that's still in use.
		// TODO: investigate error conditions.
		return nil, err
	}
	return c, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *NotebookClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *NotebookClient) Close() error {
	return c.connPool.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 *NotebookClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

// ListInstances lists instances in a given project and location.
func (c *NotebookClient) ListInstances(ctx context.Context, req *notebookspb.ListInstancesRequest, opts ...gax.CallOption) *InstanceIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListInstances[0:len(c.CallOptions.ListInstances):len(c.CallOptions.ListInstances)], opts...)
	it := &InstanceIterator{}
	req = proto.Clone(req).(*notebookspb.ListInstancesRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*notebookspb.Instance, string, error) {
		var resp *notebookspb.ListInstancesResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.notebookClient.ListInstances(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetInstances(), 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
}

// GetInstance gets details of a single Instance.
func (c *NotebookClient) GetInstance(ctx context.Context, req *notebookspb.GetInstanceRequest, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetInstance[0:len(c.CallOptions.GetInstance):len(c.CallOptions.GetInstance)], opts...)
	var resp *notebookspb.Instance
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.GetInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateInstance creates a new Instance in a given project and location.
func (c *NotebookClient) CreateInstance(ctx context.Context, req *notebookspb.CreateInstanceRequest, opts ...gax.CallOption) (*CreateInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateInstance[0:len(c.CallOptions.CreateInstance):len(c.CallOptions.CreateInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.CreateInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &CreateInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// RegisterInstance registers an existing legacy notebook instance to the Notebooks API server.
// Legacy instances are instances created with the legacy Compute Engine
// calls. They are not manageable by the Notebooks API out of the box. This
// call makes these instances manageable by the Notebooks API.
func (c *NotebookClient) RegisterInstance(ctx context.Context, req *notebookspb.RegisterInstanceRequest, opts ...gax.CallOption) (*RegisterInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.RegisterInstance[0:len(c.CallOptions.RegisterInstance):len(c.CallOptions.RegisterInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.RegisterInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &RegisterInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// SetInstanceAccelerator updates the guest accelerators of a single Instance.
func (c *NotebookClient) SetInstanceAccelerator(ctx context.Context, req *notebookspb.SetInstanceAcceleratorRequest, opts ...gax.CallOption) (*SetInstanceAcceleratorOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.SetInstanceAccelerator[0:len(c.CallOptions.SetInstanceAccelerator):len(c.CallOptions.SetInstanceAccelerator)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.SetInstanceAccelerator(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &SetInstanceAcceleratorOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// SetInstanceMachineType updates the machine type of a single Instance.
func (c *NotebookClient) SetInstanceMachineType(ctx context.Context, req *notebookspb.SetInstanceMachineTypeRequest, opts ...gax.CallOption) (*SetInstanceMachineTypeOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.SetInstanceMachineType[0:len(c.CallOptions.SetInstanceMachineType):len(c.CallOptions.SetInstanceMachineType)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.SetInstanceMachineType(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &SetInstanceMachineTypeOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// SetInstanceLabels updates the labels of an Instance.
func (c *NotebookClient) SetInstanceLabels(ctx context.Context, req *notebookspb.SetInstanceLabelsRequest, opts ...gax.CallOption) (*SetInstanceLabelsOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.SetInstanceLabels[0:len(c.CallOptions.SetInstanceLabels):len(c.CallOptions.SetInstanceLabels)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.SetInstanceLabels(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &SetInstanceLabelsOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// DeleteInstance deletes a single Instance.
func (c *NotebookClient) DeleteInstance(ctx context.Context, req *notebookspb.DeleteInstanceRequest, opts ...gax.CallOption) (*DeleteInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteInstance[0:len(c.CallOptions.DeleteInstance):len(c.CallOptions.DeleteInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.DeleteInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// StartInstance starts a notebook instance.
func (c *NotebookClient) StartInstance(ctx context.Context, req *notebookspb.StartInstanceRequest, opts ...gax.CallOption) (*StartInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.StartInstance[0:len(c.CallOptions.StartInstance):len(c.CallOptions.StartInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.StartInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &StartInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// StopInstance stops a notebook instance.
func (c *NotebookClient) StopInstance(ctx context.Context, req *notebookspb.StopInstanceRequest, opts ...gax.CallOption) (*StopInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.StopInstance[0:len(c.CallOptions.StopInstance):len(c.CallOptions.StopInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.StopInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &StopInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// ResetInstance resets a notebook instance.
func (c *NotebookClient) ResetInstance(ctx context.Context, req *notebookspb.ResetInstanceRequest, opts ...gax.CallOption) (*ResetInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ResetInstance[0:len(c.CallOptions.ResetInstance):len(c.CallOptions.ResetInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.ResetInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &ResetInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// ReportInstanceInfo allows notebook instances to
// report their latest instance information to the Notebooks
// API server. The server will merge the reported information to
// the instance metadata store. Do not use this method directly.
func (c *NotebookClient) ReportInstanceInfo(ctx context.Context, req *notebookspb.ReportInstanceInfoRequest, opts ...gax.CallOption) (*ReportInstanceInfoOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ReportInstanceInfo[0:len(c.CallOptions.ReportInstanceInfo):len(c.CallOptions.ReportInstanceInfo)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.ReportInstanceInfo(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &ReportInstanceInfoOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// IsInstanceUpgradeable check if a notebook instance is upgradable.
func (c *NotebookClient) IsInstanceUpgradeable(ctx context.Context, req *notebookspb.IsInstanceUpgradeableRequest, opts ...gax.CallOption) (*notebookspb.IsInstanceUpgradeableResponse, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "notebook_instance", url.QueryEscape(req.GetNotebookInstance())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.IsInstanceUpgradeable[0:len(c.CallOptions.IsInstanceUpgradeable):len(c.CallOptions.IsInstanceUpgradeable)], opts...)
	var resp *notebookspb.IsInstanceUpgradeableResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.IsInstanceUpgradeable(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// UpgradeInstance upgrades a notebook instance to the latest version.
func (c *NotebookClient) UpgradeInstance(ctx context.Context, req *notebookspb.UpgradeInstanceRequest, opts ...gax.CallOption) (*UpgradeInstanceOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpgradeInstance[0:len(c.CallOptions.UpgradeInstance):len(c.CallOptions.UpgradeInstance)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.UpgradeInstance(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &UpgradeInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// UpgradeInstanceInternal allows notebook instances to
// call this endpoint to upgrade themselves. Do not use this method directly.
func (c *NotebookClient) UpgradeInstanceInternal(ctx context.Context, req *notebookspb.UpgradeInstanceInternalRequest, opts ...gax.CallOption) (*UpgradeInstanceInternalOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.UpgradeInstanceInternal[0:len(c.CallOptions.UpgradeInstanceInternal):len(c.CallOptions.UpgradeInstanceInternal)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.UpgradeInstanceInternal(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &UpgradeInstanceInternalOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// ListEnvironments lists environments in a project.
func (c *NotebookClient) ListEnvironments(ctx context.Context, req *notebookspb.ListEnvironmentsRequest, opts ...gax.CallOption) *EnvironmentIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.ListEnvironments[0:len(c.CallOptions.ListEnvironments):len(c.CallOptions.ListEnvironments)], opts...)
	it := &EnvironmentIterator{}
	req = proto.Clone(req).(*notebookspb.ListEnvironmentsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*notebookspb.Environment, string, error) {
		var resp *notebookspb.ListEnvironmentsResponse
		req.PageToken = pageToken
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.notebookClient.ListEnvironments(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetEnvironments(), 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
}

// GetEnvironment gets details of a single Environment.
func (c *NotebookClient) GetEnvironment(ctx context.Context, req *notebookspb.GetEnvironmentRequest, opts ...gax.CallOption) (*notebookspb.Environment, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.GetEnvironment[0:len(c.CallOptions.GetEnvironment):len(c.CallOptions.GetEnvironment)], opts...)
	var resp *notebookspb.Environment
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.GetEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateEnvironment creates a new Environment.
func (c *NotebookClient) CreateEnvironment(ctx context.Context, req *notebookspb.CreateEnvironmentRequest, opts ...gax.CallOption) (*CreateEnvironmentOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.CreateEnvironment[0:len(c.CallOptions.CreateEnvironment):len(c.CallOptions.CreateEnvironment)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.CreateEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &CreateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// DeleteEnvironment deletes a single Environment.
func (c *NotebookClient) DeleteEnvironment(ctx context.Context, req *notebookspb.DeleteEnvironmentRequest, opts ...gax.CallOption) (*DeleteEnvironmentOperation, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append(c.CallOptions.DeleteEnvironment[0:len(c.CallOptions.DeleteEnvironment):len(c.CallOptions.DeleteEnvironment)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.notebookClient.DeleteEnvironment(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteEnvironmentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, resp),
	}, nil
}

// CreateEnvironmentOperation manages a long-running operation from CreateEnvironment.
type CreateEnvironmentOperation struct {
	lro *longrunning.Operation
}

// CreateEnvironmentOperation returns a new CreateEnvironmentOperation from a given name.
// The name must be that of a previously created CreateEnvironmentOperation, possibly from a different process.
func (c *NotebookClient) CreateEnvironmentOperation(name string) *CreateEnvironmentOperation {
	return &CreateEnvironmentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *CreateEnvironmentOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Environment, error) {
	var resp notebookspb.Environment
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *CreateEnvironmentOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Environment, error) {
	var resp notebookspb.Environment
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *CreateEnvironmentOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *CreateEnvironmentOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *CreateEnvironmentOperation) Name() string {
	return op.lro.Name()
}

// CreateInstanceOperation manages a long-running operation from CreateInstance.
type CreateInstanceOperation struct {
	lro *longrunning.Operation
}

// CreateInstanceOperation returns a new CreateInstanceOperation from a given name.
// The name must be that of a previously created CreateInstanceOperation, possibly from a different process.
func (c *NotebookClient) CreateInstanceOperation(name string) *CreateInstanceOperation {
	return &CreateInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *CreateInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *CreateInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *CreateInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *CreateInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *CreateInstanceOperation) Name() string {
	return op.lro.Name()
}

// DeleteEnvironmentOperation manages a long-running operation from DeleteEnvironment.
type DeleteEnvironmentOperation struct {
	lro *longrunning.Operation
}

// DeleteEnvironmentOperation returns a new DeleteEnvironmentOperation from a given name.
// The name must be that of a previously created DeleteEnvironmentOperation, possibly from a different process.
func (c *NotebookClient) DeleteEnvironmentOperation(name string) *DeleteEnvironmentOperation {
	return &DeleteEnvironmentOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteEnvironmentOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *DeleteEnvironmentOperation) Poll(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.Poll(ctx, nil, opts...)
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *DeleteEnvironmentOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *DeleteEnvironmentOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *DeleteEnvironmentOperation) Name() string {
	return op.lro.Name()
}

// DeleteInstanceOperation manages a long-running operation from DeleteInstance.
type DeleteInstanceOperation struct {
	lro *longrunning.Operation
}

// DeleteInstanceOperation returns a new DeleteInstanceOperation from a given name.
// The name must be that of a previously created DeleteInstanceOperation, possibly from a different process.
func (c *NotebookClient) DeleteInstanceOperation(name string) *DeleteInstanceOperation {
	return &DeleteInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *DeleteInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.Poll(ctx, nil, opts...)
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *DeleteInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *DeleteInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *DeleteInstanceOperation) Name() string {
	return op.lro.Name()
}

// RegisterInstanceOperation manages a long-running operation from RegisterInstance.
type RegisterInstanceOperation struct {
	lro *longrunning.Operation
}

// RegisterInstanceOperation returns a new RegisterInstanceOperation from a given name.
// The name must be that of a previously created RegisterInstanceOperation, possibly from a different process.
func (c *NotebookClient) RegisterInstanceOperation(name string) *RegisterInstanceOperation {
	return &RegisterInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *RegisterInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *RegisterInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *RegisterInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *RegisterInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *RegisterInstanceOperation) Name() string {
	return op.lro.Name()
}

// ReportInstanceInfoOperation manages a long-running operation from ReportInstanceInfo.
type ReportInstanceInfoOperation struct {
	lro *longrunning.Operation
}

// ReportInstanceInfoOperation returns a new ReportInstanceInfoOperation from a given name.
// The name must be that of a previously created ReportInstanceInfoOperation, possibly from a different process.
func (c *NotebookClient) ReportInstanceInfoOperation(name string) *ReportInstanceInfoOperation {
	return &ReportInstanceInfoOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *ReportInstanceInfoOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *ReportInstanceInfoOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *ReportInstanceInfoOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *ReportInstanceInfoOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *ReportInstanceInfoOperation) Name() string {
	return op.lro.Name()
}

// ResetInstanceOperation manages a long-running operation from ResetInstance.
type ResetInstanceOperation struct {
	lro *longrunning.Operation
}

// ResetInstanceOperation returns a new ResetInstanceOperation from a given name.
// The name must be that of a previously created ResetInstanceOperation, possibly from a different process.
func (c *NotebookClient) ResetInstanceOperation(name string) *ResetInstanceOperation {
	return &ResetInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *ResetInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *ResetInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *ResetInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *ResetInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *ResetInstanceOperation) Name() string {
	return op.lro.Name()
}

// SetInstanceAcceleratorOperation manages a long-running operation from SetInstanceAccelerator.
type SetInstanceAcceleratorOperation struct {
	lro *longrunning.Operation
}

// SetInstanceAcceleratorOperation returns a new SetInstanceAcceleratorOperation from a given name.
// The name must be that of a previously created SetInstanceAcceleratorOperation, possibly from a different process.
func (c *NotebookClient) SetInstanceAcceleratorOperation(name string) *SetInstanceAcceleratorOperation {
	return &SetInstanceAcceleratorOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *SetInstanceAcceleratorOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *SetInstanceAcceleratorOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *SetInstanceAcceleratorOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *SetInstanceAcceleratorOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *SetInstanceAcceleratorOperation) Name() string {
	return op.lro.Name()
}

// SetInstanceLabelsOperation manages a long-running operation from SetInstanceLabels.
type SetInstanceLabelsOperation struct {
	lro *longrunning.Operation
}

// SetInstanceLabelsOperation returns a new SetInstanceLabelsOperation from a given name.
// The name must be that of a previously created SetInstanceLabelsOperation, possibly from a different process.
func (c *NotebookClient) SetInstanceLabelsOperation(name string) *SetInstanceLabelsOperation {
	return &SetInstanceLabelsOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *SetInstanceLabelsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *SetInstanceLabelsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *SetInstanceLabelsOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *SetInstanceLabelsOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *SetInstanceLabelsOperation) Name() string {
	return op.lro.Name()
}

// SetInstanceMachineTypeOperation manages a long-running operation from SetInstanceMachineType.
type SetInstanceMachineTypeOperation struct {
	lro *longrunning.Operation
}

// SetInstanceMachineTypeOperation returns a new SetInstanceMachineTypeOperation from a given name.
// The name must be that of a previously created SetInstanceMachineTypeOperation, possibly from a different process.
func (c *NotebookClient) SetInstanceMachineTypeOperation(name string) *SetInstanceMachineTypeOperation {
	return &SetInstanceMachineTypeOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *SetInstanceMachineTypeOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *SetInstanceMachineTypeOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *SetInstanceMachineTypeOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *SetInstanceMachineTypeOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *SetInstanceMachineTypeOperation) Name() string {
	return op.lro.Name()
}

// StartInstanceOperation manages a long-running operation from StartInstance.
type StartInstanceOperation struct {
	lro *longrunning.Operation
}

// StartInstanceOperation returns a new StartInstanceOperation from a given name.
// The name must be that of a previously created StartInstanceOperation, possibly from a different process.
func (c *NotebookClient) StartInstanceOperation(name string) *StartInstanceOperation {
	return &StartInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *StartInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *StartInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *StartInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *StartInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *StartInstanceOperation) Name() string {
	return op.lro.Name()
}

// StopInstanceOperation manages a long-running operation from StopInstance.
type StopInstanceOperation struct {
	lro *longrunning.Operation
}

// StopInstanceOperation returns a new StopInstanceOperation from a given name.
// The name must be that of a previously created StopInstanceOperation, possibly from a different process.
func (c *NotebookClient) StopInstanceOperation(name string) *StopInstanceOperation {
	return &StopInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *StopInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *StopInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *StopInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *StopInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *StopInstanceOperation) Name() string {
	return op.lro.Name()
}

// UpgradeInstanceOperation manages a long-running operation from UpgradeInstance.
type UpgradeInstanceOperation struct {
	lro *longrunning.Operation
}

// UpgradeInstanceOperation returns a new UpgradeInstanceOperation from a given name.
// The name must be that of a previously created UpgradeInstanceOperation, possibly from a different process.
func (c *NotebookClient) UpgradeInstanceOperation(name string) *UpgradeInstanceOperation {
	return &UpgradeInstanceOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *UpgradeInstanceOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *UpgradeInstanceOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *UpgradeInstanceOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *UpgradeInstanceOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *UpgradeInstanceOperation) Name() string {
	return op.lro.Name()
}

// UpgradeInstanceInternalOperation manages a long-running operation from UpgradeInstanceInternal.
type UpgradeInstanceInternalOperation struct {
	lro *longrunning.Operation
}

// UpgradeInstanceInternalOperation returns a new UpgradeInstanceInternalOperation from a given name.
// The name must be that of a previously created UpgradeInstanceInternalOperation, possibly from a different process.
func (c *NotebookClient) UpgradeInstanceInternalOperation(name string) *UpgradeInstanceInternalOperation {
	return &UpgradeInstanceInternalOperation{
		lro: longrunning.InternalNewOperation(c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *UpgradeInstanceInternalOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *UpgradeInstanceInternalOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*notebookspb.Instance, error) {
	var resp notebookspb.Instance
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *UpgradeInstanceInternalOperation) Metadata() (*notebookspb.OperationMetadata, error) {
	var meta notebookspb.OperationMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *UpgradeInstanceInternalOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *UpgradeInstanceInternalOperation) Name() string {
	return op.lro.Name()
}

// EnvironmentIterator manages a stream of *notebookspb.Environment.
type EnvironmentIterator struct {
	items    []*notebookspb.Environment
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*notebookspb.Environment, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *EnvironmentIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *EnvironmentIterator) Next() (*notebookspb.Environment, error) {
	var item *notebookspb.Environment
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *EnvironmentIterator) bufLen() int {
	return len(it.items)
}

func (it *EnvironmentIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}

// InstanceIterator manages a stream of *notebookspb.Instance.
type InstanceIterator struct {
	items    []*notebookspb.Instance
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*notebookspb.Instance, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *InstanceIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *InstanceIterator) Next() (*notebookspb.Instance, error) {
	var item *notebookspb.Instance
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *InstanceIterator) bufLen() int {
	return len(it.items)
}

func (it *InstanceIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}
