/**
* Return a preload interval based on the chosen timeline interval and the given date and time
*
* @param DateTime $dateTime The date and time to use
*
* @return DateInterval The interval to pre-load
*/
private function getPreloadInterval(DateTime $dateTime)
{
switch ($this->view->intervalBox->getInterval()) {
case '1d':
return DateInterval::createFromDateString('1 week -1 second');
case '1w':
return DateInterval::createFromDateString('8 weeks -1 second');
case '1m':
$dateCopy = clone $dateTime;
for ($i = 0; $i < 6; $i++) {
$dateCopy->sub(new DateInterval('PT' . Format::secondsByMonth($dateCopy) . 'S'));
}
return $dateCopy->add(new DateInterval('PT1S'))->diff($dateTime);
case '1y':
$dateCopy = clone $dateTime;
for ($i = 0; $i < 4; $i++) {
$dateCopy->sub(new DateInterval('PT' . Format::secondsByYear($dateCopy) . 'S'));
}
return $dateCopy->add(new DateInterval('PT1S'))->diff($dateTime);
default:
return DateInterval::createFromDateString('1 day -1 second');
}
}
/**
* Apply the current interval to the given date and time
*
* @param DateTime $dateTime The date and time to apply the interval to
* @param int $adjustBy By how much seconds the resulting date and time should be adjusted
*
* @return DateTime
*/
protected function applyInterval(DateTime $dateTime, $adjustBy)
{
if (!$this->interval->y && !$this->interval->m) {
if ($this->negative) {
return $dateTime->sub($this->interval)->add(new DateInterval('PT' . $adjustBy . 'S'));
} else {
return $dateTime->add($this->interval)->sub(new DateInterval('PT' . $adjustBy . 'S'));
}
} elseif ($this->interval->m) {
for ($i = 0; $i < $this->interval->m; $i++) {
if ($this->negative) {
$dateTime->sub(new DateInterval('PT' . Format::secondsByMonth($dateTime) . 'S'));
} else {
$dateTime->add(new DateInterval('PT' . Format::secondsByMonth($dateTime) . 'S'));
}
}
} elseif ($this->interval->y) {
for ($i = 0; $i < $this->interval->y; $i++) {
if ($this->negative) {
$dateTime->sub(new DateInterval('PT' . Format::secondsByYear($dateTime) . 'S'));
} else {
$dateTime->add(new DateInterval('PT' . Format::secondsByYear($dateTime) . 'S'));
}
}
}
$adjustment = new DateInterval('PT' . $adjustBy . 'S');
return $this->negative ? $dateTime->add($adjustment) : $dateTime->sub($adjustment);
}
