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<?php
/**
 * This code is licensed under Afterlogic Software License.
 * For full statements of the license see LICENSE file.
 */

namespace Aurora\Modules\Calendar\Classes;

/**
 * @license https://afterlogic.com/products/common-licensing Afterlogic Software License
 * @copyright Copyright (c) 2023, Afterlogic Corp.
 *
 * @package Calendar
 * @subpackage Classes
 */
class RRule
{
    public $StartBase;
    public $EndBase;
    public $Period;
    public $Count;
    public $Until;
    public $Interval;
    public $End;
    public $WeekNum;
    public $ByDays;
    protected $DefaultTimeZone;

public function __construct($DefaultTimeZone)
    {
        $this->DefaultTimeZone = $DefaultTimeZone;
        $this->StartBase  = null;
        $this->EndBase    = null;
        $this->Period	  = null;
        $this->Count	  = null;
        $this->Until	  = null;
        $this->Interval	  = null;
        $this->End		  = null;
        $this->WeekNum	  = null;
        $this->ByDays	  = array();
    }

public function Populate($aRRule)
    {
        $this->Period = isset($aRRule['period']) ? (int)$aRRule['period'] : null;
        $this->Count = isset($aRRule['count']) ? $aRRule['count'] : null;
        $this->Until = isset($aRRule['until']) ? $aRRule['until'] : null;
        $this->Interval = isset($aRRule['interval']) ? $aRRule['interval'] : null;
        $this->End = isset($aRRule['end']) ? $aRRule['end'] : null;
        $this->WeekNum = isset($aRRule['weekNum']) ? $aRRule['weekNum'] : null;
        $this->ByDays = isset($aRRule['byDays']) ? $aRRule['byDays'] : array();
    }

public function toArray()
    {
        return array(
            'startBase' => $this->StartBase,
            'endBase' => $this->EndBase,
            'period' => $this->Period,
            'interval' => (int) $this->Interval,
            'end' => !isset($this->End) ? 0 : $this->End,
            'until' => (int) $this->Until,
            'weekNum' => $this->WeekNum,
            'count' => $this->Count,
            'byDays' => $this->ByDays
        );
    }

public function toResponseArray($aParameters = array())
    {
        return $this->toArray();
    }

public function __toString()
    {
        $aPeriods = array(
            \Aurora\Modules\Calendar\Enums\PeriodStr::Secondly,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Minutely,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Hourly,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Daily,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Weekly,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Monthly,
            \Aurora\Modules\Calendar\Enums\PeriodStr::Yearly
        );

$sRule = '';

if (null !== $this->Period) {
            $iWeekNumber = null;
            if (($this->Period == \Aurora\Modules\Calendar\Enums\Period::Monthly || $this->Period == \Aurora\Modules\Calendar\Enums\Period::Yearly) && (null !== $this->WeekNum)) {
                $iWeekNumber = ((int)$this->WeekNum < 0 || (int)$this->WeekNum > 4) ? 0 : (int)$this->WeekNum;
            }

$sUntil = '';
            if (null !== $this->Until) {
                $oDTUntil = \Aurora\Modules\Calendar\Classes\Helper::prepareDateTime($this->Until, $this->GetTimeZone());
                $sUntil = $oDTUntil->format('Ymd\T235959\Z');
            }

$iInterval = (null !== $this->Interval) ? (int)$this->Interval : 0;
            $iEnd = (null === $this->End || (int)$this->End < 0 || (int)$this->End > 3) ? 0 : (int)$this->End;

$sFreq = strtoupper($aPeriods[$this->Period + 2]);
            $sRule = 'FREQ=' . $sFreq . ';INTERVAL=' . $iInterval;
            if ($iEnd === \Aurora\Modules\Calendar\Enums\RepeatEnd::Count) {
                $sRule .= ';COUNT=' . (null !== $this->Count) ? (int)$this->Count : 0;
            } elseif ($iEnd === \Aurora\Modules\Calendar\Enums\RepeatEnd::Date) {
                $sRule .= ';UNTIL=' . $sUntil;
            }

$sByDay = null;
            if (in_array($sFreq, array('WEEKLY', 'MONTHLY', 'YEARLY'))) {
                $sByDay = implode(',', $this->ByDays);
            }
            if (!empty($sByDay)) {
                if (in_array($sFreq, array('MONTHLY', 'YEARLY')) && isset($iWeekNumber)) {
                    if ($iWeekNumber >= 0 && $iWeekNumber < 4) {
                        $sByDay = (int)$iWeekNumber + 1 . $sByDay;
                    } elseif ($iWeekNumber === 4) {
                        $sByDay = '-1' . $sByDay;
                    }
                }
                $sRule .= ';BYDAY=' . $sByDay;
            }
        }
        return $sRule;
    }

public function GetTimeZone()
    {
        return $this->DefaultTimeZone;
    }
}