<?php
  /**
   * ownCloud - Addressbook
   *
   * @author Thomas Tanghus

   * @copyright 2012-2014 Thomas Tanghus (thomas@tanghus.net)

   *
   * 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\Contacts\CardDAV;
  
  use OCA\Contacts;
  
  /**
   * This class overrides __construct to get access to $addressBookInfo and

   * $carddavBackend, \Sabre\CardDAV\AddressBook::getACL() to return read/write

   * permissions based on user and shared state and it overrides

   * \Sabre\CardDAV\AddressBook::getChild() and \Sabre\CardDAV\AddressBook::getChildren()

   * to instantiate \OCA\Contacts\CardDAV\Cards.
  */

  class AddressBook extends \Sabre\CardDAV\AddressBook {

  
  	/**
  	* CardDAV backend
  	*

  	* @var \Sabre\CardDAV\Backend\AbstractBackend

  	*/
  	protected $carddavBackend;
  
  	/**
  	* Constructor
  	*

  	* @param \Sabre\CardDAV\Backend\AbstractBackend $carddavBackend

  	* @param array $addressBookInfo
  	*/
  	public function __construct(

  		\Sabre\CardDAV\Backend\AbstractBackend $carddavBackend,
  		array $addressBookInfo
  	) {

  
  		$this->carddavBackend = $carddavBackend;
  		$this->addressBookInfo = $addressBookInfo;
  		parent::__construct($carddavBackend, $addressBookInfo);
  
  	}
  
  	/**
  	* Returns a list of ACE's for this node.
  	*
  	* Each ACE has the following properties:
  	*   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
  	*     currently the only supported privileges
  	*   * 'principal', a url to the principal who owns the node
  	*   * 'protected' (optional), indicating that this ACE is not allowed to
  	*      be updated.
  	*
  	* @return array
  	*/
  	public function getACL() {
  
  		$readprincipal = $this->getOwner();
  		$writeprincipal = $this->getOwner();
  		$createprincipal = $this->getOwner();
  		$deleteprincipal = $this->getOwner();
  		$uid = $this->carddavBackend->userIDByPrincipal($this->getOwner());
  
  		$readWriteACL = array(
  			array(
  				'privilege' => '{DAV:}read',
  				'principal' => 'principals/' . \OCP\User::getUser(),
  				'protected' => true,
  			),
  			array(
  				'privilege' => '{DAV:}write',
  				'principal' => 'principals/' . \OCP\User::getUser(),
  				'protected' => true,
  			),
  		);
  
  		if($uid !== \OCP\User::getUser()) {

  			list(, $id) = explode('::', $this->addressBookInfo['id']);

  			$sharedAddressbook = \OCP\Share::getItemSharedWithBySource('addressbook', $id);
  			if($sharedAddressbook) {
  				if(($sharedAddressbook['permissions'] & \OCP\PERMISSION_CREATE)
  					&& ($sharedAddressbook['permissions'] & \OCP\PERMISSION_UPDATE)
  					&& ($sharedAddressbook['permissions'] & \OCP\PERMISSION_DELETE)
  				) {
  					return $readWriteACL;
  				}
  				if ($sharedAddressbook['permissions'] & \OCP\PERMISSION_CREATE) {
  					$createprincipal = 'principals/' . \OCP\User::getUser();
  				}
  				if ($sharedAddressbook['permissions'] & \OCP\PERMISSION_READ) {
  					$readprincipal = 'principals/' . \OCP\User::getUser();
  				}
  				if ($sharedAddressbook['permissions'] & \OCP\PERMISSION_UPDATE) {
  					$writeprincipal = 'principals/' . \OCP\User::getUser();
  				}
  				if ($sharedAddressbook['permissions'] & \OCP\PERMISSION_DELETE) {
  					$deleteprincipal = 'principals/' . \OCP\User::getUser();
  				}
  			}
  		} else {
  			return parent::getACL();
  		}
  
  		return array(
  			array(
  				'privilege' => '{DAV:}read',
  				'principal' => $readprincipal,
  				'protected' => true,
  			),
  			array(
  				'privilege' => '{DAV:}write-content',
  				'principal' => $writeprincipal,
  				'protected' => true,
  			),
  			array(
  				'privilege' => '{DAV:}bind',
  				'principal' => $createprincipal,
  				'protected' => true,
  			),
  			array(
  				'privilege' => '{DAV:}unbind',
  				'principal' => $deleteprincipal,
  				'protected' => true,
  			),
  		);
  
  	}

  	public function getSupportedPrivilegeSet() {

  
  		return array(
  			'privilege'  => '{DAV:}all',
  			'abstract'   => true,
  			'aggregates' => array(
  				array(
  					'privilege'  => '{DAV:}read',
  					'aggregates' => array(
  						array(
  							'privilege' => '{DAV:}read-acl',
  							'abstract'  => true,
  						),
  						array(
  							'privilege' => '{DAV:}read-current-user-privilege-set',
  							'abstract'  => true,
  						),
  					),
  				), // {DAV:}read
  				array(
  					'privilege'  => '{DAV:}write',
  					'aggregates' => array(
  						array(
  							'privilege' => '{DAV:}write-acl',
  							'abstract'  => true,
  						),
  						array(
  							'privilege' => '{DAV:}write-properties',
  							'abstract'  => true,
  						),
  						array(
  							'privilege' => '{DAV:}write-content',
  							'abstract'  => false,
  						),
  						array(
  							'privilege' => '{DAV:}bind',
  							'abstract'  => false,
  						),
  						array(
  							'privilege' => '{DAV:}unbind',
  							'abstract'  => false,
  						),
  						array(
  							'privilege' => '{DAV:}unlock',
  							'abstract'  => true,
  						),
  					),
  				), // {DAV:}write
  			),
  		); // {DAV:}all
  
  	}
  
  	/**
  	* Returns a card
  	*
  	* @param string $name

  	* @return Card

  	*/
  	public function getChild($name) {
  
  		$obj = $this->carddavBackend->getCard($this->addressBookInfo['id'],$name);
  		if (!$obj) {

  			throw new \Sabre\DAV\Exception\NotFound('Card not found');

  		}
  		return new Card($this->carddavBackend,$this->addressBookInfo,$obj);
  
  	}
  
  	/**
  	* Returns the full list of cards
  	*
  	* @return array
  	*/
  	public function getChildren() {
  
  		$objs = $this->carddavBackend->getCards($this->addressBookInfo['id']);
  		$children = array();
  		foreach($objs as $obj) {
  			$children[] = new Card($this->carddavBackend,$this->addressBookInfo,$obj);
  		}
  		return $children;
  
  	}
  
  	/**
  	* Returns the last modification date as a unix timestamp.
  	*
  	* @return int|null
  	*/
  	public function getLastModified() {
  
  		return $this->carddavBackend->lastModifiedAddressBook($this->addressBookInfo['id']);
  
  	}
  }