<?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\Service\ActivityPub;


use daita\MySmallPhpTools\Exceptions\MalformedArrayException;
use daita\MySmallPhpTools\Traits\TArrayTools;
use Exception;
use OCA\Social\Db\CacheActorsRequest;
use OCA\Social\Db\CacheDocumentsRequest;
use OCA\Social\Exceptions\CacheActorDoesNotExistException;
use OCA\Social\Exceptions\CacheDocumentDoesNotExistException;
use OCA\Social\Exceptions\InvalidResourceEntryException;
use OCA\Social\Exceptions\InvalidResourceException;
use OCA\Social\Exceptions\Request410Exception;
use OCA\Social\Exceptions\RequestException;
use OCA\Social\Exceptions\SocialAppConfigException;
use OCA\Social\Exceptions\UrlCloudException;
use OCA\Social\Model\ActivityPub\ACore;
use OCA\Social\Model\ActivityPub\Person;
use OCA\Social\Service\ConfigService;
use OCA\Social\Service\InstanceService;
use OCA\Social\Service\MiscService;


/**
 * Class PersonService
 *
 * @package OCA\Social\Service\ActivityPub
 */
class PersonService implements ICoreService {


	use TArrayTools;


	/** @var CacheActorsRequest */
	private $cacheActorsRequest;

	/** @var CacheDocumentsRequest */
	private $cacheDocumentsRequest;

	/** @var InstanceService */
	private $instanceService;

	/** @var ConfigService */
	private $configService;

	/** @var MiscService */
	private $miscService;


	/** @var string */
	private $viewerId = '';


	/**
	 * UndoService constructor.
	 *
	 * @param CacheActorsRequest $cacheActorsRequest
	 * @param CacheDocumentsRequest $cacheDocumentsRequest
	 * @param InstanceService $instanceService
	 * @param ConfigService $configService
	 * @param MiscService $miscService
	 */
	public function __construct(
		CacheActorsRequest $cacheActorsRequest, CacheDocumentsRequest $cacheDocumentsRequest,
		InstanceService $instanceService, ConfigService $configService, MiscService $miscService
	) {
		$this->cacheActorsRequest = $cacheActorsRequest;
		$this->cacheDocumentsRequest = $cacheDocumentsRequest;
		$this->instanceService = $instanceService;
		$this->configService = $configService;
		$this->miscService = $miscService;
	}


	/**
	 * @param string $viewerId
	 */
	public function setViewerId(string $viewerId) {
		$this->viewerId = $viewerId;
		$this->cacheActorsRequest->setViewerId($viewerId);
	}

	public function getViewerId(): string {
		return $this->viewerId;
	}


	/**
	 * @param Person $actor
	 * @param bool $refresh
	 */
	public function cacheLocalActor(Person $actor, bool $refresh = false) {
		if ($refresh) {
			$this->cacheActorsRequest->deleteFromId($actor->getId());
		}

		$actor->setLocal(true);
		$actor->setSource(json_encode($actor, JSON_UNESCAPED_SLASHES));

		$this->save($actor);
	}


	/**
	 * @param string $id
	 *
	 * @param bool $refresh
	 *
	 * @return Person
	 * @throws InvalidResourceException
	 * @throws RequestException
	 * @throws SocialAppConfigException
	 * @throws UrlCloudException
	 * @throws Request410Exception
	 * @throws MalformedArrayException
	 */
	public function getFromId(string $id, bool $refresh = false): Person {

		$posAnchor = strpos($id, '#');
		if ($posAnchor !== false) {
			$id = substr($id, 0, $posAnchor);
		}

		try {
			if ($refresh) {
				$this->cacheActorsRequest->deleteFromId($id);
				throw new CacheActorDoesNotExistException();
			}

			$actor = $this->cacheActorsRequest->getFromId($id);
		} catch (CacheActorDoesNotExistException $e) {
			$object = $this->instanceService->retrieveObject($id);
			$actor = $this->generateActorFromObject($object);
			$actor->setAccount($actor->getPreferredUsername() . '@' . $this->get('_host', $object));
			try {
				$this->save($actor);
			} catch (Exception $e) {
				throw new InvalidResourceException($e->getMessage());
			}
		}

		return $actor;
	}


	/**
	 * @param string $account
	 *
	 * @param bool $retrieve
	 *
	 * @return Person
	 * @throws InvalidResourceException
	 * @throws RequestException
	 * @throws CacheActorDoesNotExistException
	 * @throws SocialAppConfigException
	 * @throws UrlCloudException
	 * @throws Request410Exception
	 * @throws MalformedArrayException
	 */
	public function getFromAccount(string $account, bool $retrieve = true): Person {

		try {
			$actor = $this->cacheActorsRequest->getFromAccount($account);
		} catch (CacheActorDoesNotExistException $e) {
			if (!$retrieve) {
				throw new CacheActorDoesNotExistException();
			}

			$object = $this->instanceService->retrieveAccount($account);
			$actor = $this->generateActorFromObject($object);
			$actor->setAccount($account);
			try {
				$this->save($actor);
			} catch (Exception $e) {
				throw new InvalidResourceException($e->getMessage());
			}
		}

		return $actor;
	}


	/**
	 * @param string $account
	 *
	 * @return Person
	 * @throws CacheActorDoesNotExistException
	 */
	public function getFromLocalAccount(string $account): Person {
		return $this->cacheActorsRequest->getFromLocalAccount($account);
	}


	/**
	 * @param array $object
	 *
	 * @return Person
	 * @throws InvalidResourceException
	 * @throws SocialAppConfigException
	 * @throws UrlCloudException
	 * @throws InvalidResourceEntryException
	 */
	private function generateActorFromObject(array $object) {

		$actor = new Person();
		$actor->setUrlCloud($this->configService->getCloudAddress());
		$actor->import($object);

		if ($actor->getType() !== Person::TYPE) {
			throw new InvalidResourceException();
		}

		$actor->setSource(json_encode($object, JSON_UNESCAPED_SLASHES));

		return $actor;
	}

	/**
	 * @param string $search
	 *
	 * @return Person[]
	 */
	public function searchCachedAccounts(string $search): array {
		return $this->cacheActorsRequest->searchAccounts($search);
	}


	/**
	 * This method is called when saving the Follow object
	 *
	 * @param ACore $person
	 */
	public function parse(ACore $person) {
		/** @var Person $person */
		if ($person->isRoot() === false || $person->getId() === '') {
			return;
		}

		$this->save($person);
	}


	/**
	 * @param ACore $person
	 */
	public function save(ACore $person) {
		/** @var Person $person */
		if ($person->gotIcon()) {
			try {
				$icon = $this->cacheDocumentsRequest->getBySource(
					$person->getIcon()
						   ->getUrl()
				);
				$person->setIcon($icon);
			} catch (CacheDocumentDoesNotExistException $e) {
				$this->cacheDocumentsRequest->save($person->getIcon());
			}
		}

		$this->cacheActorsRequest->save($person);
	}


	/**
	 * @throws Exception
	 * @return int
	 */
	public function missingCacheRemoteActors(): int {
		// TODO - looking for missing cache remote actors...
		$missing = [];

		foreach ($missing as $item) {
			try {
				$this->getFromId($item->getId());
			} catch (Exception $e) {
			}
		}

		return sizeof($missing);
	}


	/**
	 * @throws Exception
	 * @return int
	 */
	public function manageCacheRemoteActors(): int {
		$update = $this->cacheActorsRequest->getRemoteActorsToUpdate();

		foreach ($update as $item) {
			try {
				$this->getFromId($item->getId(), true);
			} catch (Exception $e) {
			}
		}

		return sizeof($update);
	}


	/**
	 * @param ACore $item
	 */
	public function delete(ACore $item) {
	}

}