PhabricatorCalendarEventFrequencyTransaction.php
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	<?php

	final class PhabricatorCalendarEventFrequencyTransaction
	extends PhabricatorCalendarEventTransactionType {

	const TRANSACTIONTYPE = 'calendar.frequency';

	public function generateOldValue($object) {
	$rrule = $object->newRecurrenceRule();

	if (!$rrule) {
	return null;
	}

	return $rrule->getFrequency();
	}

	public function applyInternalEffects($object, $value) {
	$rrule = id(new PhutilCalendarRecurrenceRule())
	->setFrequency($value);

	// If the user creates a monthly event on the 29th, 30th or 31st of a
	// month, it means "the 30th of every month" as far as the RRULE is
	// concerned. Such an event will not occur on months with fewer days.

	// This is surprising, and probably not what the user wants. Instead,
	// schedule these events relative to the end of the month: on the "-1st",
	// "-2nd" or "-3rd" day of the month. For example, a monthly event on
	// the 31st of a 31-day month translates to "every month, on the last
	// day of the month".
	if ($value == PhutilCalendarRecurrenceRule::FREQUENCY_MONTHLY) {
	$start_datetime = $object->newStartDateTime();

	$y = $start_datetime->getYear();
	$m = $start_datetime->getMonth();
	$d = $start_datetime->getDay();
	if ($d >= 29) {
	$year_map = PhutilCalendarRecurrenceRule::getYearMap(
	$y,
	PhutilCalendarRecurrenceRule::WEEKDAY_MONDAY);

	$month_days = $year_map['monthDays'][$m];
	$schedule_on = -(($month_days + 1) - $d);

	$rrule->setByMonthDay(array($schedule_on));
	}
	}

	$object->setRecurrenceRule($rrule);
	}

	public function validateTransactions($object, array $xactions) {
	$errors = array();

	$valid = array(
	PhutilCalendarRecurrenceRule::FREQUENCY_DAILY,
	PhutilCalendarRecurrenceRule::FREQUENCY_WEEKLY,
	PhutilCalendarRecurrenceRule::FREQUENCY_MONTHLY,
	PhutilCalendarRecurrenceRule::FREQUENCY_YEARLY,
	);
	$valid = array_fuse($valid);

	foreach ($xactions as $xaction) {
	$value = $xaction->getNewValue();

	if (!isset($valid[$value])) {
	$errors[] = $this->newInvalidError(
	pht(
	'Event frequency "%s" is not valid. Valid frequencies are: %s.',
	$value,
	implode(', ', $valid)),
	$xaction);
	}
	}

	return $errors;
	}

	public function getTitle() {
	$frequency = $this->getFrequency($this->getNewValue());
	switch ($frequency) {
	case PhutilCalendarRecurrenceRule::FREQUENCY_DAILY:
	return pht(
	'%s set this event to repeat daily.',
	$this->renderAuthor());
	case PhutilCalendarRecurrenceRule::FREQUENCY_WEEKLY:
	return pht(
	'%s set this event to repeat weekly.',
	$this->renderAuthor());
	case PhutilCalendarRecurrenceRule::FREQUENCY_MONTHLY:
	return pht(
	'%s set this event to repeat monthly.',
	$this->renderAuthor());
	case PhutilCalendarRecurrenceRule::FREQUENCY_YEARLY:
	return pht(
	'%s set this event to repeat yearly.',
	$this->renderAuthor());
	}
	}

	public function getTitleForFeed() {
	$frequency = $this->getFrequency($this->getNewValue());
	switch ($frequency) {
	case PhutilCalendarRecurrenceRule::FREQUENCY_DAILY:
	return pht(
	'%s set %s to repeat daily.',
	$this->renderAuthor(),
	$this->renderObject());
	case PhutilCalendarRecurrenceRule::FREQUENCY_WEEKLY:
	return pht(
	'%s set %s to repeat weekly.',
	$this->renderAuthor(),
	$this->renderObject());
	case PhutilCalendarRecurrenceRule::FREQUENCY_MONTHLY:
	return pht(
	'%s set %s to repeat monthly.',
	$this->renderAuthor(),
	$this->renderObject());
	case PhutilCalendarRecurrenceRule::FREQUENCY_YEARLY:
	return pht(
	'%s set %s to repeat yearly.',
	$this->renderAuthor(),
	$this->renderObject());
	}
	}

	private function getFrequency($value) {
	// NOTE: This is normalizing three generations of these transactions
	// to use RRULE constants. It would be vaguely nice to migrate them
	// for consistency.

	if (is_array($value)) {
	$value = idx($value, 'rule');
	} else {
	$value = $value;
	}

	return phutil_utf8_strtoupper($value);
	}

	}

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