<?php

namespace Sabre\CalDAV\Backend;

use Sabre\DAV;

/**
 * Every CalDAV backend must at least implement this interface.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
interface SubscriptionSupport extends BackendInterface {

    /**
     * Returns a list of subscriptions for a principal.
     *
     * Every subscription is an array with the following keys:
     *  * id, a unique id that will be used by other functions to modify the
     *    subscription. This can be the same as the uri or a database key.
     *  * uri. This is just the 'base uri' or 'filename' of the subscription.
     *  * principaluri. The owner of the subscription. Almost always the same as
     *    principalUri passed to this method.
     *
     * Furthermore, all the subscription info must be returned too:
     *
     * 1. {DAV:}displayname
     * 2. {http://apple.com/ns/ical/}refreshrate
     * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
     *    should not be stripped).
     * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
     *    should not be stripped).
     * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
     *    attachments should not be stripped).
     * 6. {http://calendarserver.org/ns/}source (Must be a
     *     Sabre\DAV\Property\Href).
     * 7. {http://apple.com/ns/ical/}calendar-color
     * 8. {http://apple.com/ns/ical/}calendar-order
     * 9. {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
     *    (should just be an instance of
     *    Sabre\CalDAV\Property\SupportedCalendarComponentSet, with a bunch of
     *    default components).
     *
     * @param string $principalUri
     * @return array
     */
    function getSubscriptionsForUser($principalUri);

    /**
     * Creates a new subscription for a principal.
     *
     * If the creation was a success, an id must be returned that can be used to reference
     * this subscription in other methods, such as updateSubscription.
     *
     * @param string $principalUri
     * @param string $uri
     * @param array $properties
     * @return mixed
     */
    function createSubscription($principalUri, $uri, array $properties);

    /**
     * Updates a subscription
     *
     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
     * To do the actual updates, you must tell this object which properties
     * you're going to process with the handle() method.
     *
     * Calling the handle method is like telling the PropPatch object "I
     * promise I can handle updating this property".
     *
     * Read the PropPatch documenation for more info and examples.
     *
     * @param mixed $subscriptionId
     * @param \Sabre\DAV\PropPatch $propPatch
     * @return void
     */
    function updateSubscription($subscriptionId, DAV\PropPatch $propPatch);

    /**
     * Deletes a subscription.
     *
     * @param mixed $subscriptionId
     * @return void
     */
    function deleteSubscription($subscriptionId);

}
