<?php
declare(strict_types=1);

use Sabre\CardDAV;
use Sabre\DAV;

class SabreCardDAVJsonBackend extends Sabre\CardDAV\Backend\AbstractBackend implements Sabre\CardDAV\Backend\SyncSupport {
    protected $cardMgr;

    public function __construct(AddressbookCollectionManager $cardMgr) {
        $this->cardMgr = $cardMgr;
    }

    public function getAddressBooksForUser ($principalUri) {
        $addressBooks = [];

        foreach ($this->cardMgr->getCollections($principalUri) as $row) {
            $addressBooks[] = [
                'id'                                                      => $row['id'],
                'uri'                                                     => $row['uri'],
                'principaluri'                                            => $row['principaluri'],
                '{DAV:}displayname'                                       => $row['displayname'],
                '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description' => $row['description'],
                '{http://calendarserver.org/ns/}getctag'                  => $row['synctoken'],
                '{http://sabredav.org/ns}sync-token'                      => $row['synctoken'],
            ];
        }

        return $addressBooks;
    }

    public function updateAddressBook ($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
        $supportedProperties = [
            '{DAV:}displayname',
            '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description',
        ];

        $propPatch->handle($supportedProperties, function ($mutations) use ($addressBookId) {
            $values = [];

            foreach ($mutations as $property => $newValue) {
                switch ($property) {
                    case '{DAV:}displayname':
                        $values['displayname'] = $newValue;
                        break;
                    case '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description':
                        $values['description'] = $newValue;
                        break;
                }
        	}

			$this->cardMgr->updateCollection($addressBookId, $values);
            return true;
        });
    }

    public function createAddressBook ($principalUri, $url, array $properties) {
        $displayname = null;
        $description = null;

        foreach ($properties as $property => $newValue) {
            switch ($property) {
                case '{DAV:}displayname':
                    $displayname = $newValue;
                    break;
                case '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description':
                    $description = $newValue;
                    break;
                default:
                    throw new DAV\Exception\BadRequest('Unknown property: '.$property);
            }
        }

        return $this->cardMgr->createCollection($principalUri, $url, $displayname, $description);
    }

    public function deleteAddressBook ($addressBookId) {
		$this->cardMgr->deleteCollection($addressBookId);
    }

    public function getCards ($addressbookId) {
    	$objects = $this->cardMgr->getObjects($addressbookId);

		foreach ($objects as $key => $object) {
			$objects[$key]['etag'] = '"'.$object['etag'].'"';
		}
    	
        return $objects;
    }

    public function getCard ($addressBookId, $cardUri) {
    	$object = $this->cardMgr->getObject($addressBookId, $cardUri);
		if (isset($object['etag'])) $object['etag'] = '"'.$object['etag'].'"';

    	return $object;
    }

    public function getMultipleCards ($addressBookId, array $uris) {
        $result = [];

		foreach ($uris as $uri) {
			$result[] = $this->getCard($addressBookId, $uri);
        }

        return $result;
    }

    public function createCard ($addressBookId, $uri, $cardData) {
		$etag = $this->cardMgr->createObject($addressBookId, $uri, $cardData);

        return '"'.$etag.'"';
    }

    public function updateCard ($addressBookId, $uri, $cardData) {
		$etag = $this->cardMgr->updateObject($addressBookId, $uri, $cardData);

        return '"'.$etag.'"';
    }

    public function deleteCard ($addressBookId, $uri) {
		return $this->cardMgr->deleteObject($addressBookId, $uri);
    }

    public function getChangesForAddressBook ($addressBookId, $syncToken, $syncLevel, $limit = null) {
		return $this->cardMgr->getChanges($addressBookId, $syncToken, $syncLevel);
    }
}