<?php

/**
 * ownCloud
 *
 * @copyright (C) 2015 ownCloud, Inc.
 *
 * @author Bjoern Schiessle <schiessle@owncloud.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace OCA\Encryption;

use \OCP\ISession;

class Session {

	/** @var ISession */
	protected $session;

	const NOT_INITIALIZED = '0';
	const INIT_EXECUTED = '1';
	const INIT_SUCCESSFUL = '2';

	public function __construct(ISession $session) {
		$this->session = $session;
	}

	/**
	 * Sets status of encryption app
	 *
	 * @param string $status INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
	 */
	public function setStatus($status) {
		$this->session->set('encryptionInitialized', $status);
	}

	/**
	 * Gets status if we already tried to initialize the encryption app
	 *
	 * @return string init status INIT_SUCCESSFUL, INIT_EXECUTED, NOT_INITIALIZED
	 */
	public function getStatus() {
		$status = $this->session->get('encryptionInitialized');
		if (is_null($status)) {
			$status = self::NOT_INITIALIZED;
		}

		return $status;
	}

	/**
	 * Gets user or public share private key from session
	 *
	 * @return string $privateKey The user's plaintext private key
	 * @throws Exceptions\PrivateKeyMissingException
	 */
	public function getPrivateKey() {
		$key = $this->session->get('privateKey');
		if (is_null($key)) {
			throw new Exceptions\PrivateKeyMissingException('no private key stored in session');
		}
		return $key;
	}

	/**
	 * check if private key is set
	 *
	 * @return boolean
	 */
	public function isPrivateKeySet() {
		$key = $this->session->get('privateKey');
		if (is_null($key)) {
			return false;
		}

		return true;
	}

	/**
	 * Sets user private key to session
	 *
	 * @param string $key users private key
	 *
	 * @note this should only be set on login
	 */
	public function setPrivateKey($key) {
		$this->session->set('privateKey', $key);
	}


	/**
	 * remove keys from session
	 */
	public function clear() {
		$this->session->remove('publicSharePrivateKey');
		$this->session->remove('privateKey');
		$this->session->remove('encryptionInitialized');

	}

}