<?php
declare(strict_types=1);


/**
 * Nextcloud - Social Support
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 *
 * @author Maxence Lange <maxence@artificial-owl.com>
 * @copyright 2018, Maxence Lange <maxence@artificial-owl.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 OCA\Social\Db;


use DateTime;
use OCA\Social\Exceptions\NoteNotFoundException;
use OCA\Social\Model\ActivityPub\Object\Note;
use OCA\Social\Model\ActivityPub\Actor\Person;
use OCA\Social\Service\ActivityService;
use OCA\Social\Service\ConfigService;
use OCA\Social\Service\MiscService;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;

class NotesRequest extends NotesRequestBuilder {


	/**
	 * NotesRequest constructor.
	 *
	 * @param IDBConnection $connection
	 * @param ConfigService $configService
	 * @param MiscService $miscService
	 */
	public function __construct(
		IDBConnection $connection, ConfigService $configService, MiscService $miscService
	) {
		parent::__construct($connection, $configService, $miscService);
	}


	/**
	 * Insert a new Note in the database.
	 *
	 * @param Note $note
	 */
	public function save(Note $note) {
		$dTime = new DateTime();
		$dTime->setTimestamp($note->getPublishedTime());

		$source = $note->getSource();
		if (strlen($source) >= CoreRequestBuilder::SOURCE_LENGTH) {
			$source = 'too_big';
		}

		$qb = $this->getNotesInsertSql();
		$qb->setValue('id', $qb->createNamedParameter($note->getId()))
		   ->setValue('type', $qb->createNamedParameter($note->getType()))
		   ->setValue('to', $qb->createNamedParameter($note->getTo()))
		   ->setValue(
			   'to_array', $qb->createNamedParameter(
			   json_encode($note->getToArray(), JSON_UNESCAPED_SLASHES)
		   )
		   )
		   ->setValue(
			   'cc', $qb->createNamedParameter(
			   json_encode($note->getCcArray(), JSON_UNESCAPED_SLASHES)
		   )
		   )
		   ->setValue(
			   'bcc', $qb->createNamedParameter(
			   json_encode($note->getBccArray()), JSON_UNESCAPED_SLASHES
		   )
		   )
		   ->setValue('content', $qb->createNamedParameter($note->getContent()))
		   ->setValue('summary', $qb->createNamedParameter($note->getSummary()))
		   ->setValue('published', $qb->createNamedParameter($note->getPublished()))
		   ->setValue(
			   'published_time', $qb->createNamedParameter($dTime, IQueryBuilder::PARAM_DATE)
		   )
		   ->setValue('attributed_to', $qb->createNamedParameter($note->getAttributedTo()))
		   ->setValue('in_reply_to', $qb->createNamedParameter($note->getInReplyTo()))
		   ->setValue('source', $qb->createNamedParameter($source))
		   ->setValue(
			   'instances', $qb->createNamedParameter(
			   json_encode($note->getInstancePaths(), JSON_UNESCAPED_SLASHES)
		   )
		   )
		   ->setValue('local', $qb->createNamedParameter(($note->isLocal()) ? '1' : '0'))
		   ->setValue(
			   'creation',
			   $qb->createNamedParameter(new DateTime('now'), IQueryBuilder::PARAM_DATE)
		   );

		$qb->execute();
	}


	/**
	 * @param string $id
	 *
	 * @return Note
	 * @throws NoteNotFoundException
	 */
	public function getNoteById(string $id): Note {
		if ($id === '') {
			throw new NoteNotFoundException();
		};

		$qb = $this->getNotesSelectSql();
		$this->limitToIdString($qb, $id);

		$cursor = $qb->execute();
		$data = $cursor->fetch();
		$cursor->closeCursor();

		if ($data === false) {
			throw new NoteNotFoundException('Post not found');
		}

		return $this->parseNotesSelectSql($data);
	}


	/**
	 * @param string $actorId
	 *
	 * @return int
	 */
	public function countNotesFromActorId(string $actorId): int {
		$qb = $this->countNotesSelectSql();
		$this->limitToAttributedTo($qb, $actorId);

		$cursor = $qb->execute();
		$data = $cursor->fetch();
		$cursor->closeCursor();

		return $this->getInt('count', $data, 0);
	}


	/**
	 * Should returns:
	 *  * Own posts,
	 *  * Followed accounts
	 *
	 * @param Person $actor
	 * @param int $since
	 * @param int $limit
	 *
	 * @return array
	 */
	public function getStreamHome(Person $actor, int $since = 0, int $limit = 5): array {
		$qb = $this->getNotesSelectSql();

		$this->joinFollowing($qb, $actor);
		$this->limitPaginate($qb, $since, $limit);
		$this->leftJoinCacheActors($qb, 'attributed_to');

		$notes = [];
		$cursor = $qb->execute();
		while ($data = $cursor->fetch()) {
			$notes[] = $this->parseNotesSelectSql($data);
		}
		$cursor->closeCursor();

		return $notes;
	}


	/**
	 * Should returns:
	 *  * Public/Unlisted/Followers-only post where current $actor is tagged,
	 *  - Events: (not yet)
	 *    - people liking or re-posting your posts (not yet)
	 *    - someone wants to follow you (not yet)
	 *    - someone is following you (not yet)
	 *
	 * @param Person $actor
	 * @param int $since
	 * @param int $limit
	 *
	 * @return array
	 */
	public function getStreamNotifications(Person $actor, int $since = 0, int $limit = 5): array {
		$qb = $this->getNotesSelectSql();

		$this->limitPaginate($qb, $since, $limit);
		$this->limitToRecipient($qb, $actor->getId(), false);
		$this->leftJoinCacheActors($qb, 'attributed_to');

		$notes = [];
		$cursor = $qb->execute();
		while ($data = $cursor->fetch()) {
			$notes[] = $this->parseNotesSelectSql($data);
		}
		$cursor->closeCursor();

		return $notes;
	}


	/**
	 * Should returns:
	 *  * public message from actorId.
	 *  - to followers-only if follower is logged. (not yet (check ?))
	 *
	 * @param string $actorId
	 * @param int $since
	 * @param int $limit
	 *
	 * @return array
	 */
	public function getStreamAccount(string $actorId, int $since = 0, int $limit = 5): array {
		$qb = $this->getNotesSelectSql();
		$this->limitPaginate($qb, $since, $limit);
		$this->limitToAttributedTo($qb, $actorId);
		$this->leftJoinCacheActors($qb, 'attributed_to');
		$this->limitToRecipient($qb, ActivityService::TO_PUBLIC);

		$notes = [];
		$cursor = $qb->execute();
		while ($data = $cursor->fetch()) {
			$notes[] = $this->parseNotesSelectSql($data);
		}
		$cursor->closeCursor();

		return $notes;
	}


	/**
	 * Should returns:
	 *  * Private message.
	 *  - group messages. (not yet)
	 *
	 * @param Person $actor
	 * @param int $since
	 * @param int $limit
	 *
	 * @return array
	 */
	public function getStreamDirect(Person $actor, int $since = 0, int $limit = 5): array {
		$qb = $this->getNotesSelectSql();
		$this->limitPaginate($qb, $since, $limit);

		$this->limitToRecipient($qb, $actor->getId(), true);
		$this->filterToRecipient($qb, ActivityService::TO_PUBLIC);
		$this->filterToRecipient($qb, $actor->getFollowers());

		$this->leftJoinCacheActors($qb, 'attributed_to');

		$notes = [];
		$cursor = $qb->execute();
		while ($data = $cursor->fetch()) {
			$notes[] = $this->parseNotesSelectSql($data);
		}
		$cursor->closeCursor();

		return $notes;
	}


	/**
	 * Should returns:
	 *  * All local public/federated posts
	 *
	 * @param int $since
	 * @param int $limit
	 * @param bool $localOnly
	 *
	 * @return array
	 */
	public function getStreamTimeline(int $since = 0, int $limit = 5, bool $localOnly = true
	): array {
		$qb = $this->getNotesSelectSql();
		$this->limitPaginate($qb, $since, $limit);
		if ($localOnly) {
			$this->limitToLocal($qb, true);
		}
		$this->leftJoinCacheActors($qb, 'attributed_to');
		// TODO: to: = real public, cc: = unlisted !?
		$this->limitToRecipient($qb, ActivityService::TO_PUBLIC, true, ['to']);

		$notes = [];
		$cursor = $qb->execute();
		while ($data = $cursor->fetch()) {
			$notes[] = $this->parseNotesSelectSql($data);
		}
		$cursor->closeCursor();

		return $notes;
	}


	/**
	 * @param string $id
	 */
	public function deleteNoteById(string $id) {
		$qb = $this->getNotesDeleteSql();
		$this->limitToIdString($qb, $id);

		$qb->execute();
	}

}