// Copyright 2022 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 documentai

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

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	documentaipb "google.golang.org/genproto/googleapis/cloud/documentai/v1beta3"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/proto"
)

var newDocumentProcessorClientHook clientHook

// DocumentProcessorCallOptions contains the retry settings for each method of DocumentProcessorClient.
type DocumentProcessorCallOptions struct {
	ProcessDocument       []gax.CallOption
	BatchProcessDocuments []gax.CallOption
	FetchProcessorTypes   []gax.CallOption
	ListProcessors        []gax.CallOption
	CreateProcessor       []gax.CallOption
	DeleteProcessor       []gax.CallOption
	EnableProcessor       []gax.CallOption
	DisableProcessor      []gax.CallOption
	ReviewDocument        []gax.CallOption
}

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

func defaultDocumentProcessorCallOptions() *DocumentProcessorCallOptions {
	return &DocumentProcessorCallOptions{
		ProcessDocument: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		BatchProcessDocuments: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		FetchProcessorTypes: []gax.CallOption{},
		ListProcessors:      []gax.CallOption{},
		CreateProcessor:     []gax.CallOption{},
		DeleteProcessor:     []gax.CallOption{},
		EnableProcessor:     []gax.CallOption{},
		DisableProcessor:    []gax.CallOption{},
		ReviewDocument: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.DeadlineExceeded,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

// internalDocumentProcessorClient is an interface that defines the methods availaible from Cloud Document AI API.
type internalDocumentProcessorClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	ProcessDocument(context.Context, *documentaipb.ProcessRequest, ...gax.CallOption) (*documentaipb.ProcessResponse, error)
	BatchProcessDocuments(context.Context, *documentaipb.BatchProcessRequest, ...gax.CallOption) (*BatchProcessDocumentsOperation, error)
	BatchProcessDocumentsOperation(name string) *BatchProcessDocumentsOperation
	FetchProcessorTypes(context.Context, *documentaipb.FetchProcessorTypesRequest, ...gax.CallOption) (*documentaipb.FetchProcessorTypesResponse, error)
	ListProcessors(context.Context, *documentaipb.ListProcessorsRequest, ...gax.CallOption) *ProcessorIterator
	CreateProcessor(context.Context, *documentaipb.CreateProcessorRequest, ...gax.CallOption) (*documentaipb.Processor, error)
	DeleteProcessor(context.Context, *documentaipb.DeleteProcessorRequest, ...gax.CallOption) (*DeleteProcessorOperation, error)
	DeleteProcessorOperation(name string) *DeleteProcessorOperation
	EnableProcessor(context.Context, *documentaipb.EnableProcessorRequest, ...gax.CallOption) (*EnableProcessorOperation, error)
	EnableProcessorOperation(name string) *EnableProcessorOperation
	DisableProcessor(context.Context, *documentaipb.DisableProcessorRequest, ...gax.CallOption) (*DisableProcessorOperation, error)
	DisableProcessorOperation(name string) *DisableProcessorOperation
	ReviewDocument(context.Context, *documentaipb.ReviewDocumentRequest, ...gax.CallOption) (*ReviewDocumentOperation, error)
	ReviewDocumentOperation(name string) *ReviewDocumentOperation
}

// DocumentProcessorClient is a client for interacting with Cloud Document AI API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// Service to call Cloud DocumentAI to process documents according to the
// processor’s definition. Processors are built using state-of-the-art Google
// AI such as natural language, computer vision, and translation to extract
// structured information from unstructured or semi-structured documents.
type DocumentProcessorClient struct {
	// The internal transport-dependent client.
	internalClient internalDocumentProcessorClient

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

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

// 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 *DocumentProcessorClient) 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 *DocumentProcessorClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

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

// ProcessDocument processes a single document.
func (c *DocumentProcessorClient) ProcessDocument(ctx context.Context, req *documentaipb.ProcessRequest, opts ...gax.CallOption) (*documentaipb.ProcessResponse, error) {
	return c.internalClient.ProcessDocument(ctx, req, opts...)
}

// BatchProcessDocuments lRO endpoint to batch process many documents. The output is written
// to Cloud Storage as JSON in the [Document] format.
func (c *DocumentProcessorClient) BatchProcessDocuments(ctx context.Context, req *documentaipb.BatchProcessRequest, opts ...gax.CallOption) (*BatchProcessDocumentsOperation, error) {
	return c.internalClient.BatchProcessDocuments(ctx, req, opts...)
}

// BatchProcessDocumentsOperation returns a new BatchProcessDocumentsOperation from a given name.
// The name must be that of a previously created BatchProcessDocumentsOperation, possibly from a different process.
func (c *DocumentProcessorClient) BatchProcessDocumentsOperation(name string) *BatchProcessDocumentsOperation {
	return c.internalClient.BatchProcessDocumentsOperation(name)
}

// FetchProcessorTypes fetches processor types.
func (c *DocumentProcessorClient) FetchProcessorTypes(ctx context.Context, req *documentaipb.FetchProcessorTypesRequest, opts ...gax.CallOption) (*documentaipb.FetchProcessorTypesResponse, error) {
	return c.internalClient.FetchProcessorTypes(ctx, req, opts...)
}

// ListProcessors lists all processors which belong to this project.
func (c *DocumentProcessorClient) ListProcessors(ctx context.Context, req *documentaipb.ListProcessorsRequest, opts ...gax.CallOption) *ProcessorIterator {
	return c.internalClient.ListProcessors(ctx, req, opts...)
}

// CreateProcessor creates a processor from the type processor that the user chose.
// The processor will be at “ENABLED” state by default after its creation.
func (c *DocumentProcessorClient) CreateProcessor(ctx context.Context, req *documentaipb.CreateProcessorRequest, opts ...gax.CallOption) (*documentaipb.Processor, error) {
	return c.internalClient.CreateProcessor(ctx, req, opts...)
}

// DeleteProcessor deletes the processor, unloads all deployed model artifacts if it was
// enabled and then deletes all artifacts associated with this processor.
func (c *DocumentProcessorClient) DeleteProcessor(ctx context.Context, req *documentaipb.DeleteProcessorRequest, opts ...gax.CallOption) (*DeleteProcessorOperation, error) {
	return c.internalClient.DeleteProcessor(ctx, req, opts...)
}

// DeleteProcessorOperation returns a new DeleteProcessorOperation from a given name.
// The name must be that of a previously created DeleteProcessorOperation, possibly from a different process.
func (c *DocumentProcessorClient) DeleteProcessorOperation(name string) *DeleteProcessorOperation {
	return c.internalClient.DeleteProcessorOperation(name)
}

// EnableProcessor enables a processor
func (c *DocumentProcessorClient) EnableProcessor(ctx context.Context, req *documentaipb.EnableProcessorRequest, opts ...gax.CallOption) (*EnableProcessorOperation, error) {
	return c.internalClient.EnableProcessor(ctx, req, opts...)
}

// EnableProcessorOperation returns a new EnableProcessorOperation from a given name.
// The name must be that of a previously created EnableProcessorOperation, possibly from a different process.
func (c *DocumentProcessorClient) EnableProcessorOperation(name string) *EnableProcessorOperation {
	return c.internalClient.EnableProcessorOperation(name)
}

// DisableProcessor disables a processor
func (c *DocumentProcessorClient) DisableProcessor(ctx context.Context, req *documentaipb.DisableProcessorRequest, opts ...gax.CallOption) (*DisableProcessorOperation, error) {
	return c.internalClient.DisableProcessor(ctx, req, opts...)
}

// DisableProcessorOperation returns a new DisableProcessorOperation from a given name.
// The name must be that of a previously created DisableProcessorOperation, possibly from a different process.
func (c *DocumentProcessorClient) DisableProcessorOperation(name string) *DisableProcessorOperation {
	return c.internalClient.DisableProcessorOperation(name)
}

// ReviewDocument send a document for Human Review. The input document should be processed by
// the specified processor.
func (c *DocumentProcessorClient) ReviewDocument(ctx context.Context, req *documentaipb.ReviewDocumentRequest, opts ...gax.CallOption) (*ReviewDocumentOperation, error) {
	return c.internalClient.ReviewDocument(ctx, req, opts...)
}

// ReviewDocumentOperation returns a new ReviewDocumentOperation from a given name.
// The name must be that of a previously created ReviewDocumentOperation, possibly from a different process.
func (c *DocumentProcessorClient) ReviewDocumentOperation(name string) *ReviewDocumentOperation {
	return c.internalClient.ReviewDocumentOperation(name)
}

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

	// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
	disableDeadlines bool

	// Points back to the CallOptions field of the containing DocumentProcessorClient
	CallOptions **DocumentProcessorCallOptions

	// The gRPC API client.
	documentProcessorClient documentaipb.DocumentProcessorServiceClient

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

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

// NewDocumentProcessorClient creates a new document processor service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service to call Cloud DocumentAI to process documents according to the
// processor’s definition. Processors are built using state-of-the-art Google
// AI such as natural language, computer vision, and translation to extract
// structured information from unstructured or semi-structured documents.
func NewDocumentProcessorClient(ctx context.Context, opts ...option.ClientOption) (*DocumentProcessorClient, error) {
	clientOpts := defaultDocumentProcessorGRPCClientOptions()
	if newDocumentProcessorClientHook != nil {
		hookOpts, err := newDocumentProcessorClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	disableDeadlines, err := checkDisableDeadlines()
	if err != nil {
		return nil, err
	}

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

	c := &documentProcessorGRPCClient{
		connPool:                connPool,
		disableDeadlines:        disableDeadlines,
		documentProcessorClient: documentaipb.NewDocumentProcessorServiceClient(connPool),
		CallOptions:             &client.CallOptions,
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	client.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
	}
	c.LROClient = &client.LROClient
	return &client, nil
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *documentProcessorGRPCClient) 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 *documentProcessorGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("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 *documentProcessorGRPCClient) Close() error {
	return c.connPool.Close()
}

func (c *documentProcessorGRPCClient) ProcessDocument(ctx context.Context, req *documentaipb.ProcessRequest, opts ...gax.CallOption) (*documentaipb.ProcessResponse, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).ProcessDocument[0:len((*c.CallOptions).ProcessDocument):len((*c.CallOptions).ProcessDocument)], opts...)
	var resp *documentaipb.ProcessResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.ProcessDocument(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *documentProcessorGRPCClient) BatchProcessDocuments(ctx context.Context, req *documentaipb.BatchProcessRequest, opts ...gax.CallOption) (*BatchProcessDocumentsOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).BatchProcessDocuments[0:len((*c.CallOptions).BatchProcessDocuments):len((*c.CallOptions).BatchProcessDocuments)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.BatchProcessDocuments(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &BatchProcessDocumentsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *documentProcessorGRPCClient) FetchProcessorTypes(ctx context.Context, req *documentaipb.FetchProcessorTypesRequest, opts ...gax.CallOption) (*documentaipb.FetchProcessorTypesResponse, 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).FetchProcessorTypes[0:len((*c.CallOptions).FetchProcessorTypes):len((*c.CallOptions).FetchProcessorTypes)], opts...)
	var resp *documentaipb.FetchProcessorTypesResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.FetchProcessorTypes(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *documentProcessorGRPCClient) ListProcessors(ctx context.Context, req *documentaipb.ListProcessorsRequest, opts ...gax.CallOption) *ProcessorIterator {
	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).ListProcessors[0:len((*c.CallOptions).ListProcessors):len((*c.CallOptions).ListProcessors)], opts...)
	it := &ProcessorIterator{}
	req = proto.Clone(req).(*documentaipb.ListProcessorsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*documentaipb.Processor, string, error) {
		resp := &documentaipb.ListProcessorsResponse{}
		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 = c.documentProcessorClient.ListProcessors(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetProcessors(), 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 *documentProcessorGRPCClient) CreateProcessor(ctx context.Context, req *documentaipb.CreateProcessorRequest, opts ...gax.CallOption) (*documentaipb.Processor, 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).CreateProcessor[0:len((*c.CallOptions).CreateProcessor):len((*c.CallOptions).CreateProcessor)], opts...)
	var resp *documentaipb.Processor
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.CreateProcessor(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *documentProcessorGRPCClient) DeleteProcessor(ctx context.Context, req *documentaipb.DeleteProcessorRequest, opts ...gax.CallOption) (*DeleteProcessorOperation, 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).DeleteProcessor[0:len((*c.CallOptions).DeleteProcessor):len((*c.CallOptions).DeleteProcessor)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.DeleteProcessor(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteProcessorOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *documentProcessorGRPCClient) EnableProcessor(ctx context.Context, req *documentaipb.EnableProcessorRequest, opts ...gax.CallOption) (*EnableProcessorOperation, 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).EnableProcessor[0:len((*c.CallOptions).EnableProcessor):len((*c.CallOptions).EnableProcessor)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.EnableProcessor(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &EnableProcessorOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *documentProcessorGRPCClient) DisableProcessor(ctx context.Context, req *documentaipb.DisableProcessorRequest, opts ...gax.CallOption) (*DisableProcessorOperation, 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).DisableProcessor[0:len((*c.CallOptions).DisableProcessor):len((*c.CallOptions).DisableProcessor)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.DisableProcessor(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DisableProcessorOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *documentProcessorGRPCClient) ReviewDocument(ctx context.Context, req *documentaipb.ReviewDocumentRequest, opts ...gax.CallOption) (*ReviewDocumentOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 120000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "human_review_config", url.QueryEscape(req.GetHumanReviewConfig())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).ReviewDocument[0:len((*c.CallOptions).ReviewDocument):len((*c.CallOptions).ReviewDocument)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.documentProcessorClient.ReviewDocument(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &ReviewDocumentOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

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

// BatchProcessDocumentsOperation returns a new BatchProcessDocumentsOperation from a given name.
// The name must be that of a previously created BatchProcessDocumentsOperation, possibly from a different process.
func (c *documentProcessorGRPCClient) BatchProcessDocumentsOperation(name string) *BatchProcessDocumentsOperation {
	return &BatchProcessDocumentsOperation{
		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 *BatchProcessDocumentsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.BatchProcessResponse, error) {
	var resp documentaipb.BatchProcessResponse
	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 *BatchProcessDocumentsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.BatchProcessResponse, error) {
	var resp documentaipb.BatchProcessResponse
	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 *BatchProcessDocumentsOperation) Metadata() (*documentaipb.BatchProcessMetadata, error) {
	var meta documentaipb.BatchProcessMetadata
	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 *BatchProcessDocumentsOperation) 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 *BatchProcessDocumentsOperation) Name() string {
	return op.lro.Name()
}

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

// DeleteProcessorOperation returns a new DeleteProcessorOperation from a given name.
// The name must be that of a previously created DeleteProcessorOperation, possibly from a different process.
func (c *documentProcessorGRPCClient) DeleteProcessorOperation(name string) *DeleteProcessorOperation {
	return &DeleteProcessorOperation{
		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 *DeleteProcessorOperation) 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 *DeleteProcessorOperation) 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 *DeleteProcessorOperation) Metadata() (*documentaipb.DeleteProcessorMetadata, error) {
	var meta documentaipb.DeleteProcessorMetadata
	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 *DeleteProcessorOperation) 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 *DeleteProcessorOperation) Name() string {
	return op.lro.Name()
}

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

// DisableProcessorOperation returns a new DisableProcessorOperation from a given name.
// The name must be that of a previously created DisableProcessorOperation, possibly from a different process.
func (c *documentProcessorGRPCClient) DisableProcessorOperation(name string) *DisableProcessorOperation {
	return &DisableProcessorOperation{
		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 *DisableProcessorOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.DisableProcessorResponse, error) {
	var resp documentaipb.DisableProcessorResponse
	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 *DisableProcessorOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.DisableProcessorResponse, error) {
	var resp documentaipb.DisableProcessorResponse
	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 *DisableProcessorOperation) Metadata() (*documentaipb.DisableProcessorMetadata, error) {
	var meta documentaipb.DisableProcessorMetadata
	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 *DisableProcessorOperation) 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 *DisableProcessorOperation) Name() string {
	return op.lro.Name()
}

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

// EnableProcessorOperation returns a new EnableProcessorOperation from a given name.
// The name must be that of a previously created EnableProcessorOperation, possibly from a different process.
func (c *documentProcessorGRPCClient) EnableProcessorOperation(name string) *EnableProcessorOperation {
	return &EnableProcessorOperation{
		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 *EnableProcessorOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.EnableProcessorResponse, error) {
	var resp documentaipb.EnableProcessorResponse
	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 *EnableProcessorOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.EnableProcessorResponse, error) {
	var resp documentaipb.EnableProcessorResponse
	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 *EnableProcessorOperation) Metadata() (*documentaipb.EnableProcessorMetadata, error) {
	var meta documentaipb.EnableProcessorMetadata
	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 *EnableProcessorOperation) 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 *EnableProcessorOperation) Name() string {
	return op.lro.Name()
}

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

// ReviewDocumentOperation returns a new ReviewDocumentOperation from a given name.
// The name must be that of a previously created ReviewDocumentOperation, possibly from a different process.
func (c *documentProcessorGRPCClient) ReviewDocumentOperation(name string) *ReviewDocumentOperation {
	return &ReviewDocumentOperation{
		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 *ReviewDocumentOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*documentaipb.ReviewDocumentResponse, error) {
	var resp documentaipb.ReviewDocumentResponse
	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 *ReviewDocumentOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*documentaipb.ReviewDocumentResponse, error) {
	var resp documentaipb.ReviewDocumentResponse
	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 *ReviewDocumentOperation) Metadata() (*documentaipb.ReviewDocumentOperationMetadata, error) {
	var meta documentaipb.ReviewDocumentOperationMetadata
	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 *ReviewDocumentOperation) 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 *ReviewDocumentOperation) Name() string {
	return op.lro.Name()
}

// ProcessorIterator manages a stream of *documentaipb.Processor.
type ProcessorIterator struct {
	items    []*documentaipb.Processor
	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 []*documentaipb.Processor, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *ProcessorIterator) 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 *ProcessorIterator) Next() (*documentaipb.Processor, error) {
	var item *documentaipb.Processor
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

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

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