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<?php

declare(strict_types=1);

/**
 * @copyright Copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
 *
 * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Joas Schilling <coding@schilljs.com>
 * @author John Molakvoæ <skjnldsv@protonmail.com>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 * @author Kate Döen <kate.doeen@nextcloud.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */
namespace OC\Core\Controller;

use OCA\Core\ResponseDefinitions;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\DataResponse;
use OCP\AppFramework\OCSController;
use OCP\Collaboration\AutoComplete\AutoCompleteEvent;
use OCP\Collaboration\AutoComplete\IManager;
use OCP\Collaboration\Collaborators\ISearch;
use OCP\EventDispatcher\IEventDispatcher;
use OCP\IRequest;
use OCP\Share\IShare;

/**
 * @psalm-import-type CoreAutocompleteResult from ResponseDefinitions
 */
class AutoCompleteController extends OCSController {
	public function __construct(
		string $appName,
		IRequest $request,
		private ISearch $collaboratorSearch,
		private IManager $autoCompleteManager,
		private IEventDispatcher $dispatcher,
	) {
		parent::__construct($appName, $request);
	}

	/**
	 * @NoAdminRequired
	 *
	 * Autocomplete a query
	 *
	 * @param string $search Text to search for
	 * @param string|null $itemType Type of the items to search for
	 * @param string|null $itemId ID of the items to search for
	 * @param string|null $sorter can be piped, top prio first, e.g.: "commenters|share-recipients"
	 * @param int[] $shareTypes Types of shares to search for
	 * @param int $limit Maximum number of results to return
	 *
	 * @return DataResponse<Http::STATUS_OK, CoreAutocompleteResult[], array{}>
	 *
	 * 200: Autocomplete results returned
	 */
	public function get(string $search, ?string $itemType, ?string $itemId, ?string $sorter = null, array $shareTypes = [IShare::TYPE_USER], int $limit = 10): DataResponse {
		// if enumeration/user listings are disabled, we'll receive an empty
		// result from search() – thus nothing else to do here.
		[$results,] = $this->collaboratorSearch->search($search, $shareTypes, false, $limit, 0);

		$event = new AutoCompleteEvent([
			'search' => $search,
			'results' => $results,
			'itemType' => $itemType,
			'itemId' => $itemId,
			'sorter' => $sorter,
			'shareTypes' => $shareTypes,
			'limit' => $limit,
		]);
		$this->dispatcher->dispatch(IManager::class . '::filterResults', $event);
		$results = $event->getResults();

		$exactMatches = $results['exact'];
		unset($results['exact']);
		$results = array_merge_recursive($exactMatches, $results);

		if ($sorter !== null) {
			$sorters = array_reverse(explode('|', $sorter));
			$this->autoCompleteManager->runSorters($sorters, $results, [
				'itemType' => $itemType,
				'itemId' => $itemId,
			]);
		}

		// transform to expected format
		$results = $this->prepareResultArray($results);

		return new DataResponse($results);
	}

	/**
	 * @return CoreAutocompleteResult[]
	 */
	protected function prepareResultArray(array $results): array {
		$output = [];
		/** @var string $type */
		foreach ($results as $type => $subResult) {
			foreach ($subResult as $result) {
				/** @var ?string $icon */
				$icon = array_key_exists('icon', $result) ? $result['icon'] : null;

				/** @var string $label */
				$label = $result['label'];

				/** @var ?string $subline */
				$subline = array_key_exists('subline', $result) ? $result['subline'] : null;

				/** @var ?string $status */
				$status = array_key_exists('status', $result) && is_string($result['status']) ? $result['status'] : null;

				/** @var ?string $shareWithDisplayNameUnique */
				$shareWithDisplayNameUnique = array_key_exists('shareWithDisplayNameUnique', $result) ? $result['shareWithDisplayNameUnique'] : null;

				$output[] = [
					'id' => (string) $result['value']['shareWith'],
					'label' => $label,
					'icon' => $icon ?? '',
					'source' => $type,
					'status' => $status ?? '',
					'subline' => $subline ?? '',
					'shareWithDisplayNameUnique' => $shareWithDisplayNameUnique ?? '',
				];
			}
		}
		return $output;
	}
}