<?php
/*
 * Copyright 2019 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.
 */

/*
 * GENERATED CODE WARNING
 * Generated by gapic-generator-php from the file
 * https://github.com/googleapis/googleapis/blob/master/google/firestore/v1/firestore.proto
 * Updates to the above are reflected here through a refresh process.
 */

namespace Google\Cloud\Firestore\V1\Gapic;

use Google\ApiCore\ApiException;
use Google\ApiCore\Call;
use Google\ApiCore\CredentialsWrapper;
use Google\ApiCore\GapicClientTrait;
use Google\ApiCore\RequestParamsHeaderDescriptor;
use Google\ApiCore\RetrySettings;
use Google\ApiCore\Transport\TransportInterface;
use Google\ApiCore\ValidationException;
use Google\Auth\FetchAuthTokenInterface;
use Google\Cloud\Firestore\V1\BatchGetDocumentsRequest;
use Google\Cloud\Firestore\V1\BatchGetDocumentsResponse;
use Google\Cloud\Firestore\V1\BatchWriteRequest;
use Google\Cloud\Firestore\V1\BatchWriteResponse;
use Google\Cloud\Firestore\V1\BeginTransactionRequest;
use Google\Cloud\Firestore\V1\BeginTransactionResponse;
use Google\Cloud\Firestore\V1\CommitRequest;
use Google\Cloud\Firestore\V1\CommitResponse;
use Google\Cloud\Firestore\V1\CreateDocumentRequest;
use Google\Cloud\Firestore\V1\DeleteDocumentRequest;
use Google\Cloud\Firestore\V1\Document;
use Google\Cloud\Firestore\V1\DocumentMask;
use Google\Cloud\Firestore\V1\ExplainOptions;
use Google\Cloud\Firestore\V1\GetDocumentRequest;
use Google\Cloud\Firestore\V1\ListCollectionIdsRequest;
use Google\Cloud\Firestore\V1\ListCollectionIdsResponse;
use Google\Cloud\Firestore\V1\ListDocumentsRequest;
use Google\Cloud\Firestore\V1\ListDocumentsResponse;
use Google\Cloud\Firestore\V1\ListenRequest;
use Google\Cloud\Firestore\V1\ListenResponse;
use Google\Cloud\Firestore\V1\PartitionQueryRequest;
use Google\Cloud\Firestore\V1\PartitionQueryResponse;
use Google\Cloud\Firestore\V1\Precondition;
use Google\Cloud\Firestore\V1\RollbackRequest;
use Google\Cloud\Firestore\V1\RunAggregationQueryRequest;
use Google\Cloud\Firestore\V1\RunAggregationQueryResponse;
use Google\Cloud\Firestore\V1\RunQueryRequest;
use Google\Cloud\Firestore\V1\RunQueryResponse;
use Google\Cloud\Firestore\V1\StructuredAggregationQuery;
use Google\Cloud\Firestore\V1\StructuredQuery;
use Google\Cloud\Firestore\V1\TransactionOptions;
use Google\Cloud\Firestore\V1\UpdateDocumentRequest;
use Google\Cloud\Firestore\V1\Write;
use Google\Cloud\Firestore\V1\WriteRequest;
use Google\Cloud\Firestore\V1\WriteResponse;
use Google\Protobuf\GPBEmpty;
use Google\Protobuf\Timestamp;

/**
 * Service Description: The Cloud Firestore service.
 *
 * Cloud Firestore is a fast, fully managed, serverless, cloud-native NoSQL
 * document database that simplifies storing, syncing, and querying data for
 * your mobile, web, and IoT apps at global scale. Its client libraries provide
 * live synchronization and offline support, while its security features and
 * integrations with Firebase and Google Cloud Platform accelerate building
 * truly serverless apps.
 *
 * This class provides the ability to make remote calls to the backing service through method
 * calls that map to API methods. Sample code to get started:
 *
 * ```
 * $firestoreClient = new FirestoreClient();
 * try {
 *     $database = 'database';
 *     $documents = [];
 *     // Read all responses until the stream is complete
 *     $stream = $firestoreClient->batchGetDocuments($database, $documents);
 *     foreach ($stream->readAll() as $element) {
 *         // doSomethingWith($element);
 *     }
 * } finally {
 *     $firestoreClient->close();
 * }
 * ```
 *
 * @deprecated Please use the new service client {@see \Google\Cloud\Firestore\V1\Client\FirestoreClient}.
 */
class FirestoreGapicClient
{
    use GapicClientTrait;

    /** The name of the service. */
    const SERVICE_NAME = 'google.firestore.v1.Firestore';

    /**
     * The default address of the service.
     *
     * @deprecated SERVICE_ADDRESS_TEMPLATE should be used instead.
     */
    const SERVICE_ADDRESS = 'firestore.googleapis.com';

    /** The address template of the service. */
    private const SERVICE_ADDRESS_TEMPLATE = 'firestore.UNIVERSE_DOMAIN';

    /** The default port of the service. */
    const DEFAULT_SERVICE_PORT = 443;

    /** The name of the code generator, to be included in the agent header. */
    const CODEGEN_NAME = 'gapic';

    /** The default scopes required by the service. */
    public static $serviceScopes = [
        'https://www.googleapis.com/auth/cloud-platform',
        'https://www.googleapis.com/auth/datastore',
    ];

    private static function getClientDefaults()
    {
        return [
            'serviceName' => self::SERVICE_NAME,
            'apiEndpoint' => self::SERVICE_ADDRESS . ':' . self::DEFAULT_SERVICE_PORT,
            'clientConfig' => __DIR__ . '/../resources/firestore_client_config.json',
            'descriptorsConfigPath' => __DIR__ . '/../resources/firestore_descriptor_config.php',
            'gcpApiConfigPath' => __DIR__ . '/../resources/firestore_grpc_config.json',
            'credentialsConfig' => [
                'defaultScopes' => self::$serviceScopes,
            ],
            'transportConfig' => [
                'rest' => [
                    'restClientConfigPath' => __DIR__ . '/../resources/firestore_rest_client_config.php',
                ],
            ],
        ];
    }

    /**
     * Constructor.
     *
     * @param array $options {
     *     Optional. Options for configuring the service API wrapper.
     *
     *     @type string $apiEndpoint
     *           The address of the API remote host. May optionally include the port, formatted
     *           as "<uri>:<port>". Default 'firestore.googleapis.com:443'.
     *     @type string|array|FetchAuthTokenInterface|CredentialsWrapper $credentials
     *           The credentials to be used by the client to authorize API calls. This option
     *           accepts either a path to a credentials file, or a decoded credentials file as a
     *           PHP array.
     *           *Advanced usage*: In addition, this option can also accept a pre-constructed
     *           {@see \Google\Auth\FetchAuthTokenInterface} object or
     *           {@see \Google\ApiCore\CredentialsWrapper} object. Note that when one of these
     *           objects are provided, any settings in $credentialsConfig will be ignored.
     *     @type array $credentialsConfig
     *           Options used to configure credentials, including auth token caching, for the
     *           client. For a full list of supporting configuration options, see
     *           {@see \Google\ApiCore\CredentialsWrapper::build()} .
     *     @type bool $disableRetries
     *           Determines whether or not retries defined by the client configuration should be
     *           disabled. Defaults to `false`.
     *     @type string|array $clientConfig
     *           Client method configuration, including retry settings. This option can be either
     *           a path to a JSON file, or a PHP array containing the decoded JSON data. By
     *           default this settings points to the default client config file, which is
     *           provided in the resources folder.
     *     @type string|TransportInterface $transport
     *           The transport used for executing network requests. May be either the string
     *           `rest` or `grpc`. Defaults to `grpc` if gRPC support is detected on the system.
     *           *Advanced usage*: Additionally, it is possible to pass in an already
     *           instantiated {@see \Google\ApiCore\Transport\TransportInterface} object. Note
     *           that when this object is provided, any settings in $transportConfig, and any
     *           $apiEndpoint setting, will be ignored.
     *     @type array $transportConfig
     *           Configuration options that will be used to construct the transport. Options for
     *           each supported transport type should be passed in a key for that transport. For
     *           example:
     *           $transportConfig = [
     *               'grpc' => [...],
     *               'rest' => [...],
     *           ];
     *           See the {@see \Google\ApiCore\Transport\GrpcTransport::build()} and
     *           {@see \Google\ApiCore\Transport\RestTransport::build()} methods for the
     *           supported options.
     *     @type callable $clientCertSource
     *           A callable which returns the client cert as a string. This can be used to
     *           provide a certificate and private key to the transport layer for mTLS.
     * }
     *
     * @throws ValidationException
     */
    public function __construct(array $options = [])
    {
        $clientOptions = $this->buildClientOptions($options);
        $this->setClientOptions($clientOptions);
    }

    /**
     * Gets multiple documents.
     *
     * Documents returned by this method are not guaranteed to be returned in the
     * same order that they were requested.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $documents = [];
     *     // Read all responses until the stream is complete
     *     $stream = $firestoreClient->batchGetDocuments($database, $documents);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string   $database     Required. The database name. In the format:
     *                               `projects/{project_id}/databases/{database_id}`.
     * @param string[] $documents    The names of the documents to retrieve. In the format:
     *                               `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     *                               The request will fail if any of the document is not a child resource of the
     *                               given `database`. Duplicate names will be elided.
     * @param array    $optionalArgs {
     *     Optional.
     *
     *     @type DocumentMask $mask
     *           The fields to return. If not set, returns all fields.
     *
     *           If a document has a field that is not present in this mask, that field will
     *           not be returned in the response.
     *     @type string $transaction
     *           Reads documents in a transaction.
     *     @type TransactionOptions $newTransaction
     *           Starts a new transaction and reads the documents.
     *           Defaults to a read-only transaction.
     *           The new transaction ID will be returned as the first response in the
     *           stream.
     *     @type Timestamp $readTime
     *           Reads documents as they were at the given time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function batchGetDocuments($database, $documents, array $optionalArgs = [])
    {
        $request = new BatchGetDocumentsRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $request->setDocuments($documents);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['mask'])) {
            $request->setMask($optionalArgs['mask']);
        }

        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['newTransaction'])) {
            $request->setNewTransaction($optionalArgs['newTransaction']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('BatchGetDocuments', BatchGetDocumentsResponse::class, $optionalArgs, $request, Call::SERVER_STREAMING_CALL);
    }

    /**
     * Applies a batch of write operations.
     *
     * The BatchWrite method does not apply the write operations atomically
     * and can apply them out of order. Method does not allow more than one write
     * per document. Each write succeeds or fails independently. See the
     * [BatchWriteResponse][google.firestore.v1.BatchWriteResponse] for the
     * success status of each write.
     *
     * If you require an atomically applied set of writes, use
     * [Commit][google.firestore.v1.Firestore.Commit] instead.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $response = $firestoreClient->batchWrite();
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param array $optionalArgs {
     *     Optional.
     *
     *     @type string $database
     *           Required. The database name. In the format:
     *           `projects/{project_id}/databases/{database_id}`.
     *     @type Write[] $writes
     *           The writes to apply.
     *
     *           Method does not apply writes atomically and does not guarantee ordering.
     *           Each write succeeds or fails independently. You cannot write to the same
     *           document more than once per request.
     *     @type array $labels
     *           Labels associated with this batch write.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\BatchWriteResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function batchWrite(array $optionalArgs = [])
    {
        $request = new BatchWriteRequest();
        $requestParamHeaders = [];
        if (isset($optionalArgs['database'])) {
            $request->setDatabase($optionalArgs['database']);
            $requestParamHeaders['database'] = $optionalArgs['database'];
        }

        if (isset($optionalArgs['writes'])) {
            $request->setWrites($optionalArgs['writes']);
        }

        if (isset($optionalArgs['labels'])) {
            $request->setLabels($optionalArgs['labels']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('BatchWrite', BatchWriteResponse::class, $optionalArgs, $request)->wait();
    }

    /**
     * Starts a new transaction.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $response = $firestoreClient->beginTransaction($database);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $database     Required. The database name. In the format:
     *                             `projects/{project_id}/databases/{database_id}`.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type TransactionOptions $options
     *           The options for the transaction.
     *           Defaults to a read-write transaction.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\BeginTransactionResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function beginTransaction($database, array $optionalArgs = [])
    {
        $request = new BeginTransactionRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['options'])) {
            $request->setOptions($optionalArgs['options']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('BeginTransaction', BeginTransactionResponse::class, $optionalArgs, $request)->wait();
    }

    /**
     * Commits a transaction, while optionally updating documents.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $writes = [];
     *     $response = $firestoreClient->commit($database, $writes);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string  $database     Required. The database name. In the format:
     *                              `projects/{project_id}/databases/{database_id}`.
     * @param Write[] $writes       The writes to apply.
     *
     *                              Always executed atomically and in order.
     * @param array   $optionalArgs {
     *     Optional.
     *
     *     @type string $transaction
     *           If set, applies all writes in this transaction, and commits it.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\CommitResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function commit($database, $writes, array $optionalArgs = [])
    {
        $request = new CommitRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $request->setWrites($writes);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('Commit', CommitResponse::class, $optionalArgs, $request)->wait();
    }

    /**
     * Creates a new document.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $parent = 'parent';
     *     $collectionId = 'collection_id';
     *     $documentId = 'document_id';
     *     $document = new Document();
     *     $response = $firestoreClient->createDocument($parent, $collectionId, $documentId, $document);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string   $parent       Required. The parent resource. For example:
     *                               `projects/{project_id}/databases/{database_id}/documents` or
     *                               `projects/{project_id}/databases/{database_id}/documents/chatrooms/{chatroom_id}`
     * @param string   $collectionId Required. The collection ID, relative to `parent`, to list. For example:
     *                               `chatrooms`.
     * @param string   $documentId   The client-assigned document ID to use for this document.
     *
     *                               Optional. If not specified, an ID will be assigned by the service.
     * @param Document $document     Required. The document to create. `name` must not be set.
     * @param array    $optionalArgs {
     *     Optional.
     *
     *     @type DocumentMask $mask
     *           The fields to return. If not set, returns all fields.
     *
     *           If the document has a field that is not present in this mask, that field
     *           will not be returned in the response.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\Document
     *
     * @throws ApiException if the remote call fails
     */
    public function createDocument($parent, $collectionId, $documentId, $document, array $optionalArgs = [])
    {
        $request = new CreateDocumentRequest();
        $requestParamHeaders = [];
        $request->setParent($parent);
        $request->setCollectionId($collectionId);
        $request->setDocumentId($documentId);
        $request->setDocument($document);
        $requestParamHeaders['parent'] = $parent;
        $requestParamHeaders['collection_id'] = $collectionId;
        if (isset($optionalArgs['mask'])) {
            $request->setMask($optionalArgs['mask']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('CreateDocument', Document::class, $optionalArgs, $request)->wait();
    }

    /**
     * Deletes a document.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $name = 'name';
     *     $firestoreClient->deleteDocument($name);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $name         Required. The resource name of the Document to delete. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type Precondition $currentDocument
     *           An optional precondition on the document.
     *           The request will fail if this is set and not met by the target document.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @throws ApiException if the remote call fails
     */
    public function deleteDocument($name, array $optionalArgs = [])
    {
        $request = new DeleteDocumentRequest();
        $requestParamHeaders = [];
        $request->setName($name);
        $requestParamHeaders['name'] = $name;
        if (isset($optionalArgs['currentDocument'])) {
            $request->setCurrentDocument($optionalArgs['currentDocument']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('DeleteDocument', GPBEmpty::class, $optionalArgs, $request)->wait();
    }

    /**
     * Gets a single document.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $name = 'name';
     *     $response = $firestoreClient->getDocument($name);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $name         Required. The resource name of the Document to get. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type DocumentMask $mask
     *           The fields to return. If not set, returns all fields.
     *
     *           If the document has a field that is not present in this mask, that field
     *           will not be returned in the response.
     *     @type string $transaction
     *           Reads the document in a transaction.
     *     @type Timestamp $readTime
     *           Reads the version of the document at the given time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\Document
     *
     * @throws ApiException if the remote call fails
     */
    public function getDocument($name, array $optionalArgs = [])
    {
        $request = new GetDocumentRequest();
        $requestParamHeaders = [];
        $request->setName($name);
        $requestParamHeaders['name'] = $name;
        if (isset($optionalArgs['mask'])) {
            $request->setMask($optionalArgs['mask']);
        }

        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('GetDocument', Document::class, $optionalArgs, $request)->wait();
    }

    /**
     * Lists all the collection IDs underneath a document.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $parent = 'parent';
     *     // Iterate over pages of elements
     *     $pagedResponse = $firestoreClient->listCollectionIds($parent);
     *     foreach ($pagedResponse->iteratePages() as $page) {
     *         foreach ($page as $element) {
     *             // doSomethingWith($element);
     *         }
     *     }
     *     // Alternatively:
     *     // Iterate through all elements
     *     $pagedResponse = $firestoreClient->listCollectionIds($parent);
     *     foreach ($pagedResponse->iterateAllElements() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $parent       Required. The parent document. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     *                             For example:
     *                             `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type int $pageSize
     *           The maximum number of resources contained in the underlying API
     *           response. The API may return fewer values in a page, even if
     *           there are additional values to be retrieved.
     *     @type string $pageToken
     *           A page token is used to specify a page of values to be returned.
     *           If no page token is specified (the default), the first page
     *           of values will be returned. Any page token used here must have
     *           been generated by a previous call to the API.
     *     @type Timestamp $readTime
     *           Reads documents as they were at the given time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\ApiCore\PagedListResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function listCollectionIds($parent, array $optionalArgs = [])
    {
        $request = new ListCollectionIdsRequest();
        $requestParamHeaders = [];
        $request->setParent($parent);
        $requestParamHeaders['parent'] = $parent;
        if (isset($optionalArgs['pageSize'])) {
            $request->setPageSize($optionalArgs['pageSize']);
        }

        if (isset($optionalArgs['pageToken'])) {
            $request->setPageToken($optionalArgs['pageToken']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->getPagedListResponse('ListCollectionIds', $optionalArgs, ListCollectionIdsResponse::class, $request);
    }

    /**
     * Lists documents.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $parent = 'parent';
     *     $collectionId = 'collection_id';
     *     // Iterate over pages of elements
     *     $pagedResponse = $firestoreClient->listDocuments($parent, $collectionId);
     *     foreach ($pagedResponse->iteratePages() as $page) {
     *         foreach ($page as $element) {
     *             // doSomethingWith($element);
     *         }
     *     }
     *     // Alternatively:
     *     // Iterate through all elements
     *     $pagedResponse = $firestoreClient->listDocuments($parent, $collectionId);
     *     foreach ($pagedResponse->iterateAllElements() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $parent       Required. The parent resource name. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents` or
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     *
     *                             For example:
     *                             `projects/my-project/databases/my-database/documents` or
     *                             `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
     * @param string $collectionId Optional. The collection ID, relative to `parent`, to list.
     *
     *                             For example: `chatrooms` or `messages`.
     *
     *                             This is optional, and when not provided, Firestore will list documents
     *                             from all collections under the provided `parent`.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type int $pageSize
     *           The maximum number of resources contained in the underlying API
     *           response. The API may return fewer values in a page, even if
     *           there are additional values to be retrieved.
     *     @type string $pageToken
     *           A page token is used to specify a page of values to be returned.
     *           If no page token is specified (the default), the first page
     *           of values will be returned. Any page token used here must have
     *           been generated by a previous call to the API.
     *     @type string $orderBy
     *           Optional. The optional ordering of the documents to return.
     *
     *           For example: `priority desc, __name__ desc`.
     *
     *           This mirrors the [`ORDER BY`][google.firestore.v1.StructuredQuery.order_by]
     *           used in Firestore queries but in a string representation. When absent,
     *           documents are ordered based on `__name__ ASC`.
     *     @type DocumentMask $mask
     *           Optional. The fields to return. If not set, returns all fields.
     *
     *           If a document has a field that is not present in this mask, that field
     *           will not be returned in the response.
     *     @type string $transaction
     *           Perform the read as part of an already active transaction.
     *     @type Timestamp $readTime
     *           Perform the read at the provided time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type bool $showMissing
     *           If the list should show missing documents.
     *
     *           A document is missing if it does not exist, but there are sub-documents
     *           nested underneath it. When true, such missing documents will be returned
     *           with a key but will not have fields,
     *           [`create_time`][google.firestore.v1.Document.create_time], or
     *           [`update_time`][google.firestore.v1.Document.update_time] set.
     *
     *           Requests with `show_missing` may not specify `where` or `order_by`.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\ApiCore\PagedListResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function listDocuments($parent, $collectionId, array $optionalArgs = [])
    {
        $request = new ListDocumentsRequest();
        $requestParamHeaders = [];
        $request->setParent($parent);
        $request->setCollectionId($collectionId);
        $requestParamHeaders['parent'] = $parent;
        $requestParamHeaders['collection_id'] = $collectionId;
        if (isset($optionalArgs['pageSize'])) {
            $request->setPageSize($optionalArgs['pageSize']);
        }

        if (isset($optionalArgs['pageToken'])) {
            $request->setPageToken($optionalArgs['pageToken']);
        }

        if (isset($optionalArgs['orderBy'])) {
            $request->setOrderBy($optionalArgs['orderBy']);
        }

        if (isset($optionalArgs['mask'])) {
            $request->setMask($optionalArgs['mask']);
        }

        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        if (isset($optionalArgs['showMissing'])) {
            $request->setShowMissing($optionalArgs['showMissing']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->getPagedListResponse('ListDocuments', $optionalArgs, ListDocumentsResponse::class, $request);
    }

    /**
     * Listens to changes. This method is only available via gRPC or WebChannel
     * (not REST).
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $request = new ListenRequest();
     *     $request->setDatabase($database);
     *     // Write all requests to the server, then read all responses until the
     *     // stream is complete
     *     $requests = [
     *         $request,
     *     ];
     *     $stream = $firestoreClient->listen();
     *     $stream->writeAll($requests);
     *     foreach ($stream->closeWriteAndReadAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     *     // Alternatively:
     *     // Write requests individually, making read() calls if
     *     // required. Call closeWrite() once writes are complete, and read the
     *     // remaining responses from the server.
     *     $requests = [
     *         $request,
     *     ];
     *     $stream = $firestoreClient->listen();
     *     foreach ($requests as $request) {
     *         $stream->write($request);
     *         // if required, read a single response from the stream
     *         $element = $stream->read();
     *         // doSomethingWith($element)
     *     }
     *     $stream->closeWrite();
     *     $element = $stream->read();
     *     while (!is_null($element)) {
     *         // doSomethingWith($element)
     *         $element = $stream->read();
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param array $optionalArgs {
     *     Optional.
     *
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\BidiStream
     *
     * @throws ApiException if the remote call fails
     */
    public function listen(array $optionalArgs = [])
    {
        return $this->startCall('Listen', ListenResponse::class, $optionalArgs, null, Call::BIDI_STREAMING_CALL);
    }

    /**
     * Partitions a query by returning partition cursors that can be used to run
     * the query in parallel. The returned partition cursors are split points that
     * can be used by RunQuery as starting/end points for the query results.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     // Iterate over pages of elements
     *     $pagedResponse = $firestoreClient->partitionQueryPaginated();
     *     foreach ($pagedResponse->iteratePages() as $page) {
     *         foreach ($page as $element) {
     *             // doSomethingWith($element);
     *         }
     *     }
     *     // Alternatively:
     *     // Iterate through all elements
     *     $pagedResponse = $firestoreClient->partitionQueryPaginated();
     *     foreach ($pagedResponse->iterateAllElements() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param array $optionalArgs {
     *     Optional.
     *
     *     @type string $parent
     *           Required. The parent resource name. In the format:
     *           `projects/{project_id}/databases/{database_id}/documents`.
     *           Document resource names are not supported; only database resource names
     *           can be specified.
     *     @type StructuredQuery $structuredQuery
     *           A structured query.
     *           Query must specify collection with all descendants and be ordered by name
     *           ascending. Other filters, order bys, limits, offsets, and start/end
     *           cursors are not supported.
     *     @type int $partitionCount
     *           The desired maximum number of partition points.
     *           The partitions may be returned across multiple pages of results.
     *           The number must be positive. The actual number of partitions
     *           returned may be fewer.
     *
     *           For example, this may be set to one fewer than the number of parallel
     *           queries to be run, or in running a data pipeline job, one fewer than the
     *           number of workers or compute instances available.
     *     @type string $pageToken
     *           A page token is used to specify a page of values to be returned.
     *           If no page token is specified (the default), the first page
     *           of values will be returned. Any page token used here must have
     *           been generated by a previous call to the API.
     *     @type int $pageSize
     *           The maximum number of resources contained in the underlying API
     *           response. The API may return fewer values in a page, even if
     *           there are additional values to be retrieved.
     *     @type Timestamp $readTime
     *           Reads documents as they were at the given time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\ApiCore\PagedListResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function partitionQueryPaginated(array $optionalArgs = [])
    {
        $request = new PartitionQueryRequest();
        $requestParamHeaders = [];
        if (isset($optionalArgs['parent'])) {
            $request->setParent($optionalArgs['parent']);
            $requestParamHeaders['parent'] = $optionalArgs['parent'];
        }

        if (isset($optionalArgs['structuredQuery'])) {
            $request->setStructuredQuery($optionalArgs['structuredQuery']);
        }

        if (isset($optionalArgs['partitionCount'])) {
            $request->setPartitionCount($optionalArgs['partitionCount']);
        }

        if (isset($optionalArgs['pageToken'])) {
            $request->setPageToken($optionalArgs['pageToken']);
        }

        if (isset($optionalArgs['pageSize'])) {
            $request->setPageSize($optionalArgs['pageSize']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->getPagedListResponse('PartitionQuery', $optionalArgs, PartitionQueryResponse::class, $request);
    }

    /**
     * Rolls back a transaction.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $transaction = '...';
     *     $firestoreClient->rollback($database, $transaction);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $database     Required. The database name. In the format:
     *                             `projects/{project_id}/databases/{database_id}`.
     * @param string $transaction  Required. The transaction to roll back.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @throws ApiException if the remote call fails
     */
    public function rollback($database, $transaction, array $optionalArgs = [])
    {
        $request = new RollbackRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $request->setTransaction($transaction);
        $requestParamHeaders['database'] = $database;
        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('Rollback', GPBEmpty::class, $optionalArgs, $request)->wait();
    }

    /**
     * Runs an aggregation query.
     *
     * Rather than producing [Document][google.firestore.v1.Document] results like
     * [Firestore.RunQuery][google.firestore.v1.Firestore.RunQuery], this API
     * allows running an aggregation to produce a series of
     * [AggregationResult][google.firestore.v1.AggregationResult] server-side.
     *
     * High-Level Example:
     *
     * ```
     * -- Return the number of documents in table given a filter.
     * SELECT COUNT(*) FROM ( SELECT * FROM k where a = true );
     * ```
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $parent = 'parent';
     *     // Read all responses until the stream is complete
     *     $stream = $firestoreClient->runAggregationQuery($parent);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $parent       Required. The parent resource name. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents` or
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     *                             For example:
     *                             `projects/my-project/databases/my-database/documents` or
     *                             `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type StructuredAggregationQuery $structuredAggregationQuery
     *           An aggregation query.
     *     @type string $transaction
     *           Run the aggregation within an already active transaction.
     *
     *           The value here is the opaque transaction ID to execute the query in.
     *     @type TransactionOptions $newTransaction
     *           Starts a new transaction as part of the query, defaulting to read-only.
     *
     *           The new transaction ID will be returned as the first response in the
     *           stream.
     *     @type Timestamp $readTime
     *           Executes the query at the given timestamp.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type ExplainOptions $explainOptions
     *           Optional. Explain options for the query. If set, additional query
     *           statistics will be returned. If not, only query results will be returned.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function runAggregationQuery($parent, array $optionalArgs = [])
    {
        $request = new RunAggregationQueryRequest();
        $requestParamHeaders = [];
        $request->setParent($parent);
        $requestParamHeaders['parent'] = $parent;
        if (isset($optionalArgs['structuredAggregationQuery'])) {
            $request->setStructuredAggregationQuery($optionalArgs['structuredAggregationQuery']);
        }

        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['newTransaction'])) {
            $request->setNewTransaction($optionalArgs['newTransaction']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        if (isset($optionalArgs['explainOptions'])) {
            $request->setExplainOptions($optionalArgs['explainOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('RunAggregationQuery', RunAggregationQueryResponse::class, $optionalArgs, $request, Call::SERVER_STREAMING_CALL);
    }

    /**
     * Runs a query.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $parent = 'parent';
     *     // Read all responses until the stream is complete
     *     $stream = $firestoreClient->runQuery($parent);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param string $parent       Required. The parent resource name. In the format:
     *                             `projects/{project_id}/databases/{database_id}/documents` or
     *                             `projects/{project_id}/databases/{database_id}/documents/{document_path}`.
     *                             For example:
     *                             `projects/my-project/databases/my-database/documents` or
     *                             `projects/my-project/databases/my-database/documents/chatrooms/my-chatroom`
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type StructuredQuery $structuredQuery
     *           A structured query.
     *     @type string $transaction
     *           Run the query within an already active transaction.
     *
     *           The value here is the opaque transaction ID to execute the query in.
     *     @type TransactionOptions $newTransaction
     *           Starts a new transaction and reads the documents.
     *           Defaults to a read-only transaction.
     *           The new transaction ID will be returned as the first response in the
     *           stream.
     *     @type Timestamp $readTime
     *           Reads documents as they were at the given time.
     *
     *           This must be a microsecond precision timestamp within the past one hour,
     *           or if Point-in-Time Recovery is enabled, can additionally be a whole
     *           minute timestamp within the past 7 days.
     *     @type ExplainOptions $explainOptions
     *           Optional. Explain options for the query. If set, additional query
     *           statistics will be returned. If not, only query results will be returned.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function runQuery($parent, array $optionalArgs = [])
    {
        $request = new RunQueryRequest();
        $requestParamHeaders = [];
        $request->setParent($parent);
        $requestParamHeaders['parent'] = $parent;
        if (isset($optionalArgs['structuredQuery'])) {
            $request->setStructuredQuery($optionalArgs['structuredQuery']);
        }

        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['newTransaction'])) {
            $request->setNewTransaction($optionalArgs['newTransaction']);
        }

        if (isset($optionalArgs['readTime'])) {
            $request->setReadTime($optionalArgs['readTime']);
        }

        if (isset($optionalArgs['explainOptions'])) {
            $request->setExplainOptions($optionalArgs['explainOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('RunQuery', RunQueryResponse::class, $optionalArgs, $request, Call::SERVER_STREAMING_CALL);
    }

    /**
     * Updates or inserts a document.
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $document = new Document();
     *     $updateMask = new DocumentMask();
     *     $response = $firestoreClient->updateDocument($document, $updateMask);
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param Document     $document     Required. The updated document.
     *                                   Creates the document if it does not already exist.
     * @param DocumentMask $updateMask   The fields to update.
     *                                   None of the field paths in the mask may contain a reserved name.
     *
     *                                   If the document exists on the server and has fields not referenced in the
     *                                   mask, they are left unchanged.
     *                                   Fields referenced in the mask, but not present in the input document, are
     *                                   deleted from the document on the server.
     * @param array        $optionalArgs {
     *     Optional.
     *
     *     @type DocumentMask $mask
     *           The fields to return. If not set, returns all fields.
     *
     *           If the document has a field that is not present in this mask, that field
     *           will not be returned in the response.
     *     @type Precondition $currentDocument
     *           An optional precondition on the document.
     *           The request will fail if this is set and not met by the target document.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Firestore\V1\Document
     *
     * @throws ApiException if the remote call fails
     */
    public function updateDocument($document, $updateMask, array $optionalArgs = [])
    {
        $request = new UpdateDocumentRequest();
        $requestParamHeaders = [];
        $request->setDocument($document);
        $request->setUpdateMask($updateMask);
        $requestParamHeaders['document.name'] = $document->getName();
        if (isset($optionalArgs['mask'])) {
            $request->setMask($optionalArgs['mask']);
        }

        if (isset($optionalArgs['currentDocument'])) {
            $request->setCurrentDocument($optionalArgs['currentDocument']);
        }

        $requestParams = new RequestParamsHeaderDescriptor($requestParamHeaders);
        $optionalArgs['headers'] = isset($optionalArgs['headers']) ? array_merge($requestParams->getHeader(), $optionalArgs['headers']) : $requestParams->getHeader();
        return $this->startCall('UpdateDocument', Document::class, $optionalArgs, $request)->wait();
    }

    /**
     * Streams batches of document updates and deletes, in order. This method is
     * only available via gRPC or WebChannel (not REST).
     *
     * Sample code:
     * ```
     * $firestoreClient = new FirestoreClient();
     * try {
     *     $database = 'database';
     *     $request = new WriteRequest();
     *     $request->setDatabase($database);
     *     // Write all requests to the server, then read all responses until the
     *     // stream is complete
     *     $requests = [
     *         $request,
     *     ];
     *     $stream = $firestoreClient->write();
     *     $stream->writeAll($requests);
     *     foreach ($stream->closeWriteAndReadAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     *     // Alternatively:
     *     // Write requests individually, making read() calls if
     *     // required. Call closeWrite() once writes are complete, and read the
     *     // remaining responses from the server.
     *     $requests = [
     *         $request,
     *     ];
     *     $stream = $firestoreClient->write();
     *     foreach ($requests as $request) {
     *         $stream->write($request);
     *         // if required, read a single response from the stream
     *         $element = $stream->read();
     *         // doSomethingWith($element)
     *     }
     *     $stream->closeWrite();
     *     $element = $stream->read();
     *     while (!is_null($element)) {
     *         // doSomethingWith($element)
     *         $element = $stream->read();
     *     }
     * } finally {
     *     $firestoreClient->close();
     * }
     * ```
     *
     * @param array $optionalArgs {
     *     Optional.
     *
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\BidiStream
     *
     * @throws ApiException if the remote call fails
     */
    public function write(array $optionalArgs = [])
    {
        return $this->startCall('Write', WriteResponse::class, $optionalArgs, null, Call::BIDI_STREAMING_CALL);
    }
}
