<?php

declare(strict_types=1);

/**
 * @copyright Copyright (c) 2022 Varun Patil <radialapps@gmail.com>
 * @author Varun Patil <radialapps@gmail.com>
 * @license AGPL-3.0-or-later
 *
 * 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 OCA\Memories\Controller;

use OCA\Memories\Exceptions;
use OCA\Memories\Util;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\JSONResponse;

class MapController extends GenericApiController
{
    /**
     * @NoAdminRequired
     */
    public function clusters(): Http\Response
    {
        return Util::guardEx(function () {
            // Make sure we have bounds and zoom level
            // Zoom level is used to determine the grid length
            $bounds = $this->request->getParam('bounds');
            $zoomLevel = $this->request->getParam('zoom');
            if (!$bounds || !$zoomLevel || !is_numeric($zoomLevel)) {
                throw Exceptions::MissingParameter('bounds or zoom');
            }

            // A tweakable parameter to determine the number of boxes in the map
            // Note: these parameters need to be changed in MapSplitMatter.vue as well
            $clusterDensity = 1;
            $gridLen = 180.0 / (2 ** $zoomLevel * $clusterDensity);

            $clusters = $this->timelineQuery->getMapClusters($gridLen, $bounds);

            // Get previews for each cluster
            $clusterIds = array_map(fn ($cluster) => (int) $cluster['id'], $clusters);
            $previews = $this->timelineQuery->getMapClusterPreviews($clusterIds);

            // Merge the responses
            $fileMap = [];
            foreach ($previews as &$preview) {
                $fileMap[$preview['mapcluster']] = $preview;
            }
            foreach ($clusters as &$cluster) {
                $cluster['preview'] = $fileMap[$cluster['id']] ?? null;
            }

            return new JSONResponse($clusters);
        });
    }
}