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diff --git a/lib/public/FullTextSearch/IFullTextSearchManager.php b/lib/public/FullTextSearch/IFullTextSearchManager.php
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+++ b/lib/public/FullTextSearch/IFullTextSearchManager.php
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+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\FullTextSearch;
+
+use OCP\FullTextSearch\Model\IIndex;
+use OCP\FullTextSearch\Model\ISearchResult;
+use OCP\FullTextSearch\Service\IIndexService;
+use OCP\FullTextSearch\Service\IProviderService;
+use OCP\FullTextSearch\Service\ISearchService;
+
+/**
+ * Interface IFullTextSearchManager
+ *
+ * Should be used to manage FullTextSearch from the app that contains your
+ * Content Provider/Search Platform.
+ *
+ * @since 15.0.0
+ *
+ */
+interface IFullTextSearchManager {
+	/**
+	 * Register a IProviderService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IProviderService $providerService
+	 */
+	public function registerProviderService(IProviderService $providerService);
+
+	/**
+	 * Register a IIndexService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndexService $indexService
+	 */
+	public function registerIndexService(IIndexService $indexService);
+
+	/**
+	 * Register a ISearchService.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param ISearchService $searchService
+	 */
+	public function registerSearchService(ISearchService $searchService);
+
+	/**
+	 * returns true is Full Text Search is available (app is present and Service
+	 * are registered)
+	 *
+	 * @since 16.0.0
+	 *
+	 * @return bool
+	 */
+	public function isAvailable(): bool;
+
+
+	/**
+	 * Add the Javascript API in the navigation page of an app.
+	 * Needed to replace the default search.
+	 *
+	 * @since 15.0.0
+	 */
+	public function addJavascriptAPI();
+
+
+	/**
+	 * Check if the provider $providerId is already indexed.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 *
+	 * @return bool
+	 */
+	public function isProviderIndexed(string $providerId): bool;
+
+
+	/**
+	 * Retrieve an Index from the database, based on the Id of the Provider
+	 * and the Id of the Document
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 *
+	 * @return IIndex
+	 */
+	public function getIndex(string $providerId, string $documentId): IIndex;
+
+
+	/**
+	 * Create a new Index.
+	 *
+	 * This method must be called when a new document is created.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 * @param string $userId
+	 * @param int $status
+	 *
+	 * @return IIndex
+	 */
+	public function createIndex(string $providerId, string $documentId, string $userId, int $status = 0): IIndex;
+
+
+	/**
+	 * Update the status of an Index. status is a bitflag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param string $documentId
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexStatus(string $providerId, string $documentId, int $status, bool $reset = false);
+
+
+	/**
+	 * Update the status of an array of Index. status is a bit flag, setting $reset to
+	 * true will reset the status to the value defined in the parameter.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param string $providerId
+	 * @param array $documentIds
+	 * @param int $status
+	 * @param bool $reset
+	 */
+	public function updateIndexesStatus(string $providerId, array $documentIds, int $status, bool $reset = false);
+
+	/**
+	 * Update an array of Index.
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param IIndex[] $indexes
+	 */
+	public function updateIndexes(array $indexes);
+
+	/**
+	 * Search using an array as request. If $userId is empty, will use the
+	 * current session.
+	 *
+	 * @see ISearchService::generateSearchRequest
+	 *
+	 * @since 15.0.0
+	 *
+	 * @param array $request
+	 * @param string $userId
+	 * @return ISearchResult[]
+	 */
+	public function search(array $request, string $userId = ''): array;
+}