/**
* @param $day
* @param $time
* @return DateHelper
*/
public function createDateTime($day, $time)
{
$date = DateHelper::create();
$dayOfWeek = $date->dayOfWeek;
$dayOfWeekNeeded = DateHelper::parseSuffix($day);
$difference = $dayOfWeekNeeded - $dayOfWeek;
$date->addDays($difference);
$date->changeTime($time);
return $date;
}
/**
* Converts a days expression to the actual DateTime numbered days array
* @param $expression
* @return array
* @throws Exception
*/
private function expressionToDays($expression)
{
$days = [];
$expression = str_split($expression);
if (sizeof($expression) == 1) {
if (($day = DateHelper::parseSuffix($expression[0])) !== null) {
$days[] = $day;
} else {
throw new Exception("Invalid Format");
}
} elseif (sizeof($expression) == 2) {
$startDay = DateHelper::parseSuffix($expression[0]);
$endDay = DateHelper::parseSuffix($expression[1]);
if ($startDay !== null && $endDay !== null) {
for ($i = $startDay; $i <= $endDay; $i++) {
$days[] = $i;
}
} else {
throw new Exception("Invalid Format");
}
} else {
// They are days non sequential
$days = array_map(function ($day) {
if ($day = DateHelper::parseSuffix($day)) {
return $day;
}
}, $expression);
}
return $days;
}