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<?php
declare(strict_types=1);
namespace Cron;
use DateTimeInterface;
use DateTimeZone;
/**
* Hours field. Allows: * , / -.
*/
class HoursField extends AbstractField
{
/**
* {@inheritdoc}
*/
protected $rangeStart = 0;
/**
* {@inheritdoc}
*/
protected $rangeEnd = 23;
/**
* @var array|null Transitions returned by DateTimeZone::getTransitions()
*/
protected $transitions = [];
/**
* @var int|null Timestamp of the start of the transitions range
*/
protected $transitionsStart = null;
/**
* @var int|null Timestamp of the end of the transitions range
*/
protected $transitionsEnd = null;
/**
* {@inheritdoc}
*/
public function isSatisfiedBy(DateTimeInterface $date, $value, bool $invert): bool
{
$checkValue = (int) $date->format('H');
$retval = $this->isSatisfied($checkValue, $value);
if ($retval) {
return $retval;
}
// Are we on the edge of a transition
$lastTransition = $this->getPastTransition($date);
if (($lastTransition !== null) && ($lastTransition["ts"] > ((int) $date->format('U') - 3600))) {
$dtLastOffset = clone $date;
$this->timezoneSafeModify($dtLastOffset, "-1 hour");
$lastOffset = $dtLastOffset->getOffset();
$dtNextOffset = clone $date;
$this->timezoneSafeModify($dtNextOffset, "+1 hour");
$nextOffset = $dtNextOffset->getOffset();
$offsetChange = $nextOffset - $lastOffset;
if ($offsetChange >= 3600) {
$checkValue -= 1;
return $this->isSatisfied($checkValue, $value);
}
if ((! $invert) && ($offsetChange <= -3600)) {
$checkValue += 1;
return $this->isSatisfied($checkValue, $value);
}
}
return $retval;
}
public function getPastTransition(DateTimeInterface $date): ?array
{
$currentTimestamp = (int) $date->format('U');
if (
($this->transitions === null)
|| ($this->transitionsStart < ($currentTimestamp + 86400))
|| ($this->transitionsEnd > ($currentTimestamp - 86400))
) {
// We start a day before current time so we can differentiate between the first transition entry
// and a change that happens now
$dtLimitStart = clone $date;
$dtLimitStart = $dtLimitStart->modify("-12 months");
$dtLimitEnd = clone $date;
$dtLimitEnd = $dtLimitEnd->modify('+12 months');
$this->transitions = $date->getTimezone()->getTransitions(
$dtLimitStart->getTimestamp(),
$dtLimitEnd->getTimestamp()
);
if (empty($this->transitions)) {
return null;
}
$this->transitionsStart = $dtLimitStart->getTimestamp();
$this->transitionsEnd = $dtLimitEnd->getTimestamp();
}
$nextTransition = null;
foreach ($this->transitions as $transition) {
if ($transition["ts"] > $currentTimestamp) {
continue;
}
if (($nextTransition !== null) && ($transition["ts"] < $nextTransition["ts"])) {
continue;
}
$nextTransition = $transition;
}
return ($nextTransition ?? null);
}
/**
* {@inheritdoc}
*
* @param string|null $parts
*/
public function increment(DateTimeInterface &$date, $invert = false, $parts = null): FieldInterface
{
$originalTimestamp = (int) $date->format('U');
// Change timezone to UTC temporarily. This will
// allow us to go back or forwards and hour even
// if DST will be changed between the hours.
if (null === $parts || '*' === $parts) {
if ($invert) {
$date = $date->sub(new \DateInterval('PT1H'));
} else {
$date = $date->add(new \DateInterval('PT1H'));
}
$date = $this->setTimeHour($date, $invert, $originalTimestamp);
return $this;
}
$parts = false !== strpos($parts, ',') ? explode(',', $parts) : [$parts];
$hours = [];
foreach ($parts as $part) {
$hours = array_merge($hours, $this->getRangeForExpression($part, 23));
}
$current_hour = (int) $date->format('H');
$position = $invert ? \count($hours) - 1 : 0;
$countHours = \count($hours);
if ($countHours > 1) {
for ($i = 0; $i < $countHours - 1; ++$i) {
if ((!$invert && $current_hour >= $hours[$i] && $current_hour < $hours[$i + 1]) ||
($invert && $current_hour > $hours[$i] && $current_hour <= $hours[$i + 1])) {
$position = $invert ? $i : $i + 1;
break;
}
}
}
$target = (int) $hours[$position];
$originalHour = (int)$date->format('H');
$originalDay = (int)$date->format('d');
$previousOffset = $date->getOffset();
if (! $invert) {
if ($originalHour >= $target) {
$distance = 24 - $originalHour;
$date = $this->timezoneSafeModify($date, "+{$distance} hours");
$actualDay = (int)$date->format('d');
$actualHour = (int)$date->format('H');
if (($actualDay !== ($originalDay + 1)) && ($actualHour !== 0)) {
$offsetChange = ($previousOffset - $date->getOffset());
$date = $this->timezoneSafeModify($date, "+{$offsetChange} seconds");
}
$originalHour = (int)$date->format('H');
}
$distance = $target - $originalHour;
$date = $this->timezoneSafeModify($date, "+{$distance} hours");
} else {
if ($originalHour <= $target) {
$distance = ($originalHour + 1);
$date = $this->timezoneSafeModify($date, "-" . $distance . " hours");
$actualDay = (int)$date->format('d');
$actualHour = (int)$date->format('H');
if (($actualDay !== ($originalDay - 1)) && ($actualHour !== 23)) {
$offsetChange = ($previousOffset - $date->getOffset());
$date = $this->timezoneSafeModify($date, "+{$offsetChange} seconds");
}
$originalHour = (int)$date->format('H');
}
$distance = $originalHour - $target;
$date = $this->timezoneSafeModify($date, "-{$distance} hours");
}
$date = $this->setTimeHour($date, $invert, $originalTimestamp);
$actualHour = (int)$date->format('H');
if ($invert && ($actualHour === ($target - 1) || (($actualHour === 23) && ($target === 0)))) {
$date = $this->timezoneSafeModify($date, "+1 hour");
}
return $this;
}
}
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