<?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 Exception;
use OCA\Social\Exceptions\FollowNotFoundException;
use OCA\Social\Model\ActivityPub\Actor\Person;
use OCA\Social\Model\ActivityPub\Object\Follow;
use OCA\Social\Tools\Traits\TArrayTools;
use OCP\DB\QueryBuilder\IQueryBuilder;

/**
 * Class FollowsRequest
 *
 * @package OCA\Social\Db
 */
class FollowsRequest extends FollowsRequestBuilder {
	use TArrayTools;


	/**
	 * Insert a new Note in the database.
	 *
	 * @param Follow $follow
	 */
	public function save(Follow $follow) {
		$qb = $this->getFollowsInsertSql();
		$qb->setValue('id', $qb->createNamedParameter($follow->getId()))
		   ->setValue('actor_id', $qb->createNamedParameter($follow->getActorId()))
		   ->setValue('type', $qb->createNamedParameter($follow->getType()))
		   ->setValue('object_id', $qb->createNamedParameter($follow->getObjectId()))
		   ->setValue('follow_id', $qb->createNamedParameter($follow->getFollowId()))
		   ->setValue('accepted', $qb->createNamedParameter(($follow->isAccepted()) ? '1' : '0'))
		   ->setValue('actor_id_prim', $qb->createNamedParameter($qb->prim($follow->getActorId())))
		   ->setValue('object_id_prim', $qb->createNamedParameter($qb->prim($follow->getObjectId())))
		   ->setValue('follow_id_prim', $qb->createNamedParameter($qb->prim($follow->getFollowId())));

		try {
			$qb->setValue(
				'creation',
				$qb->createNamedParameter(new DateTime('now'), IQueryBuilder::PARAM_DATE)
			);
		} catch (Exception $e) {
		}

		$qb->generatePrimaryKey($follow->getId());
		$qb->execute();
	}


	public function generateLoopbackAccount(Person $actor) {
		$qb = $this->getFollowsInsertSql();
		$qb->setValue('id', $qb->createNamedParameter($actor->getId()))
		   ->setValue('actor_id', $qb->createNamedParameter($actor->getId()))
		   ->setValue('type', $qb->createNamedParameter('Loopback'))
		   ->setValue('object_id', $qb->createNamedParameter($actor->getId()))
		   ->setValue('follow_id', $qb->createNamedParameter($actor->getId()))
		   ->setValue('accepted', $qb->createNamedParameter('1'))
		   ->setValue('actor_id_prim', $qb->createNamedParameter($qb->prim($actor->getId())))
		   ->setValue('object_id_prim', $qb->createNamedParameter($qb->prim($actor->getId())))
		   ->setValue('follow_id_prim', $qb->createNamedParameter($qb->prim($actor->getId())));

		try {
			$qb->setValue(
				'creation',
				$qb->createNamedParameter(new DateTime('now'), IQueryBuilder::PARAM_DATE)
			);
		} catch (Exception $e) {
		}

		$qb->generatePrimaryKey($actor->getId());
		$qb->execute();
	}


	/**
	 * @param Follow $follow
	 */
	public function accepted(Follow $follow) {
		$qb = $this->getFollowsUpdateSql();
		$qb->set('accepted', $qb->createNamedParameter('1'));
		$this->limitToIdString($qb, $follow->getId());
		$this->limitToActorId($qb, $follow->getActorId());
		$this->limitToObjectId($qb, $follow->getObjectId());

		$qb->execute();
	}


	/**
	 * @return Follow[]
	 */
	public function getAll(): array {
		$qb = $this->getFollowsSelectSql();

		return $this->getFollowsFromRequest($qb);
	}


	/**
	 * @param string $actorId
	 * @param string $remoteActorId
	 *
	 * @return Follow
	 * @throws FollowNotFoundException
	 */
	public function getByPersons(string $actorId, string $remoteActorId): Follow {
		$qb = $this->getFollowsSelectSql();
		$qb->limitToActorIdPrim($qb->prim($actorId));
		$qb->limitToObjectIdPrim($qb->prim($remoteActorId));

		return $this->getFollowFromRequest($qb);
	}


	/**
	 * @param string $actorId
	 *
	 * @return int
	 */
	public function countFollowers(string $actorId): int {
		$qb = $this->countFollowsSelectSql();
		$qb->limitToObjectIdPrim($qb->prim($actorId));
		$qb->limitToType(Follow::TYPE);
		$qb->limitToAccepted(true);

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

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


	/**
	 * @param string $actorId
	 *
	 * @return int
	 */
	public function countFollowing(string $actorId): int {
		$qb = $this->countFollowsSelectSql();
		$qb->limitToActorIdPrim($qb->prim($actorId));
		$qb->limitToType(Follow::TYPE);
		$qb->limitToAccepted(true);

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

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


	/**
	 * @return int
	 */
	public function countFollows() {
		$qb = $this->countFollowsSelectSql();

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

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


	/**
	 * @param string $followId
	 *
	 * @return Follow[]
	 */
	public function getByFollowId(string $followId): array {
		$qb = $this->getFollowsSelectSql();
		$qb->limitToFollowId($followId);
		$qb->limitToAccepted(true);
		$this->leftJoinCacheActors($qb, 'actor_id');

		return $this->getFollowsFromRequest($qb);
	}


	/**
	 * @param string $actorId
	 *
	 * @return Follow[]
	 */
	public function getFollowersByActorId(string $actorId): array {
		$qb = $this->getFollowsSelectSql();
		$this->limitToObjectId($qb, $actorId);
		$this->limitToAccepted($qb, true);
		$this->leftJoinCacheActors($qb, 'actor_id');
		$this->leftJoinDetails($qb, 'id', 'ca');
		$qb->orderBy('f.creation', 'desc');

		// TODO: pagination

		return $this->getFollowsFromRequest($qb);
	}


	/**
	 * @param string $actorId
	 *
	 * @return Follow[]
	 */
	public function getFollowingByActorId(string $actorId): array {
		$qb = $this->getFollowsSelectSql();
		$this->limitToActorId($qb, $actorId);
		$this->limitToAccepted($qb, true);
		$this->leftJoinCacheActors($qb, 'object_id');
		$this->leftJoinDetails($qb, 'id', 'ca');
		$qb->orderBy('f.creation', 'desc');

		return $this->getFollowsFromRequest($qb);
	}


	/**
	 * @param string $followId
	 *
	 * @return Follow[]
	 */
	public function getFollowersByFollowId(string $followId): array {
		$qb = $this->getFollowsSelectSql();
		$this->limitToFollowId($qb, $followId);
		$this->limitToAccepted($qb, true);
		$this->leftJoinAccounts($qb, 'actor_id');

		return $this->getFollowsFromRequest($qb);
	}


	/**
	 * @param Follow $follow
	 */
	public function delete(Follow $follow) {
		$qb = $this->getFollowsDeleteSql();
		$this->limitToIdString($qb, $follow->getId());

		$qb->execute();
	}

	/**
	 * @param Follow $follow
	 */
	public function deleteByPersons(Follow $follow) {
		$qb = $this->getFollowsDeleteSql();
		$this->limitToActorId($qb, $follow->getActorId());
		$this->limitToObjectId($qb, $follow->getObjectId());

		$qb->execute();
	}

	/**
	 * @param string $actorId
	 */
	public function deleteRelatedId(string $actorId) {
		$qb = $this->getFollowsDeleteSql();
		$orX = $qb->expr()->orX();
		$orX->add($qb->exprLimitToDBField('actor_id_prim', $qb->prim($actorId)));
		$orX->add($qb->exprLimitToDBField('object_id_prim', $qb->prim($actorId)));
		$qb->where($orX);
		$qb->execute();
	}

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

		$qb->execute();
	}


	/**
	 * @param string $actorId
	 * @param Person $new
	 */
	public function moveAccountFollowers(string $actorId, Person $new): void {
		$qb = $this->getFollowsUpdateSql();
		$qb->set('object_id', $qb->createNamedParameter($new->getId()))
		   ->set('object_id_prim', $qb->createNamedParameter($qb->prim($new->getId())))
		   ->set('follow_id', $qb->createNamedParameter($new->getFollowers()))
		   ->set('follow_id_prim', $qb->createNamedParameter($qb->prim($new->getFollowers())));

		$qb->limitToObjectIdPrim($qb->prim($actorId));

		$qb->executeStatement();
	}


	/**
	 * @param string $actorId
	 * @param Person $new
	 */
	public function moveAccountFollowing(string $actorId, Person $new): void {
		$qb = $this->getFollowsUpdateSql();
		$qb->set('actor_id', $qb->createNamedParameter($new->getId()))
		   ->set('actor_id_prim', $qb->createNamedParameter($qb->prim($new->getId())));

		$qb->limitToActorIdPrim($qb->prim($actorId));

		$qb->executeStatement();
	}


	/**
	 * Returns everything related to a list of actorIds.
	 * Looking at actor_id_prim and object_id_prim.
	 *
	 * @param array $actorIds
	 *
	 * @return Follow[]
	 */
	public function getFollows(array $actorIds): array {
		$qb = $this->getFollowsSelectSql();
		$qb->limitToType(Follow::TYPE);

		$prims = [];
		foreach ($actorIds as $actorId) {
			$prims[] = $qb->prim($actorId);
		}

		$orX = $qb->expr()->orX();
		$orX->add($qb->exprLimitInArray('actor_id_prim', $prims));
		$orX->add($qb->exprLimitInArray('object_id_prim', $prims));

		return $this->getFollowsFromRequest($qb);
	}
}