PhabricatorCalendarICSWriter.php
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	<?php

	final class PhabricatorCalendarICSWriter extends Phobject {

	private $viewer;
	private $events = array();

	public function setViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	return $this->viewer;
	}

	public function setEvents(array $events) {
	assert_instances_of($events, 'PhabricatorCalendarEvent');
	$this->events = $events;
	return $this;
	}

	public function getEvents() {
	return $this->events;
	}

	public function writeICSDocument() {
	$viewer = $this->getViewer();
	$events = $this->getEvents();

	$events = mpull($events, null, 'getPHID');

	if ($events) {
	$child_map = id(new PhabricatorCalendarEventQuery())
	->setViewer($viewer)
	->withParentEventPHIDs(array_keys($events))
	->execute();
	$child_map = mpull($child_map, null, 'getPHID');
	} else {
	$child_map = array();
	}

	$all_events = $events + $child_map;
	$child_groups = mgroup($child_map, 'getInstanceOfEventPHID');

	$document_node = new PhutilCalendarDocumentNode();

	foreach ($all_events as $event) {
	$child_events = idx($child_groups, $event->getPHID(), array());
	$event_node = $event->newIntermediateEventNode($viewer, $child_events);
	$document_node->appendChild($event_node);
	}

	$root_node = id(new PhutilCalendarRootNode())
	->appendChild($document_node);

	return id(new PhutilICSWriter())
	->writeICSDocument($root_node);
	}
	}