<?php


namespace customerapi\models\available;


use DateTime;

/**
 * Class DateIntervalHelper
 * @package customerapi\models\available
 * @property \DateTime $firstActiveDate
 * @property \DateTime $lastActiveDate
 * @property \DateTime $firstDisplayDate
 * @property \DateTime $lastDisplayDate
 */
class EventInterval
{

    public $year;
    public $month;

    public $countOfActiveDays = 14;
    public $daysToDisplay = 21;


    public $firstActiveDate;
    public $lastActiveDate;
    public $firstDisplayDate;
    public $lastDisplayDate;

    private function __construct($today = null, $countOfActiveDays = 14,$daysToDisplay = 21)
    {

        $this->countOfActiveDays = $countOfActiveDays;
        $this->daysToDisplay = $daysToDisplay;

        if ( !isset($today)){
            $today = new DateTime();
        }
        $today->setTime(0, 0);

        $firstActiveDay = clone $today;
        $firstActiveDay->setTime(0, 0);
        $this->firstActiveDate = $firstActiveDay;

        $lastActiveDay = clone $firstActiveDay;
        $lastActiveDay->setTime(0, 0);
        $lastActiveDay->modify('+' . $this->countOfActiveDays . ' day');
        $this->lastActiveDate = $lastActiveDay;

        $firstDisplayDate = clone $firstActiveDay;
        $firstDisplayDate->modify('this week');
        $firstDisplayDate->setTime(0, 0);
        $this->firstDisplayDate = $firstDisplayDate;

        $lastDisplayDate = clone $firstDisplayDate;
        $lastDisplayDate->setTime(0, 0);
        $lastDisplayDate->modify('+' . $this->daysToDisplay . ' day');
        $this->lastDisplayDate = $lastDisplayDate;

    }

    public static function createInterval($today = null,$countOfActiveDays = 14,$daysToDisplay = 21)
    {
        return new EventInterval($today,$countOfActiveDays,$daysToDisplay);
    }

    /**
     * @param  DateTime $day
     * @return bool   true if active, otherwise false
     */
    public function isActive($day)
    {
        $afterFirstActiveDay = $this->firstActiveDate < $day || $this->firstActiveDate == $day;
        $beforeLastActiveDay = $this->lastActiveDate > $day || $this->lastActiveDate == $day;

        return  ($afterFirstActiveDay && $beforeLastActiveDay);
    }

    /**
     * @return DateTime[]
     */
    public function getAllDisplayDates()
    {
        $dates = array();
        for ($i = 0; $i < $this->daysToDisplay; $i++) {
            $date = clone $this->firstDisplayDate;
            $date = $date->modify('+' . $i . ' day');
            $dates[] = $date;
        }
        return $dates;
    }


}