<?php

class PeriodTypes
{
    public const RESERVABLE = 1;
    public const NONRESERVABLE = 2;
}

class SchedulePeriod
{
    /**
     * @var Date
     */
    protected $_begin;

    /**
     * @var Date
     */
    protected $_end;

    protected $_label;

    protected $_id;

    public function __construct(Date $begin, Date $end, $label = null)
    {
        $this->_begin = $begin;
        $this->_end = $end;
        $this->_label = $label;
    }

    /**
     * @return Time beginning time for this period
     */
    public function Begin()
    {
        return $this->_begin->GetTime();
    }

    /**
     * @return Time ending time for this period
     */
    public function End()
    {
        return $this->_end->GetTime();
    }

    /**
     * @return Date
     */
    public function BeginDate()
    {
        return $this->_begin;
    }

    /**
     * @return Date
     */
    public function EndDate()
    {
        return $this->_end;
    }

    /**
     * @param Date $dateOverride
     * @return string
     */
    public function Label($dateOverride = null)
    {
        if (empty($this->_label)) {
            $format = Resources::GetInstance()->GetDateFormat('period_time');

            if (isset($dateOverride) && !$this->_begin->DateEquals($dateOverride)) {
                return $dateOverride->Format($format);
            }
            return $this->_begin->Format($format);
        }
        return $this->_label;
    }

    /**
     * @return string
     */
    public function LabelEnd()
    {
        if (empty($this->_label)) {
            $format = Resources::GetInstance()->GetDateFormat('period_time');

            return $this->_end->Format($format);
        }
        return '(' . $this->_label . ')';
    }

    /**
     * @return bool
     */
    public function IsReservable()
    {
        return true;
    }

    public function IsLabelled()
    {
        return !empty($this->_label);
    }

    public function ToUtc()
    {
        return new SchedulePeriod($this->_begin->ToUtc(), $this->_end->ToUtc(), $this->_label);
    }

    public function ToTimezone($timezone)
    {
        return new SchedulePeriod($this->_begin->ToTimezone($timezone), $this->_end->ToTimezone($timezone), $this->_label);
    }

    public function __toString()
    {
        return sprintf("Begin: %s End: %s Label: %s", $this->_begin, $this->_end, $this->Label());
    }

    /**
     * Compares the starting datetimes
     */
    public function Compare(SchedulePeriod $other)
    {
        return $this->_begin->Compare($other->_begin);
    }

    public function BeginsBefore(Date $date)
    {
        return $this->_begin->DateCompare($date) < 0;
    }

    public function IsPastDate()
    {
        return ReservationPastTimeConstraint::IsPast($this->BeginDate(), $this->EndDate());
    }

    /**
     * @return string
     */
    public function Id()
    {
        if (empty($this->_id)) {
            $this->_id = uniqid($this->_begin->Timestamp());
        }
        return $this->_id;
    }

    public function Span()
    {
        return 1;
    }
}

class NonSchedulePeriod extends SchedulePeriod
{
    public function IsReservable()
    {
        return false;
    }

    public function ToUtc()
    {
        return new NonSchedulePeriod($this->_begin->ToUtc(), $this->_end->ToUtc(), $this->_label);
    }

    public function ToTimezone($timezone)
    {
        return new NonSchedulePeriod($this->_begin->ToTimezone($timezone), $this->_end->ToTimezone($timezone), $this->_label);
    }
}