<?php

namespace Sabre\VObject\Component;

use DateTimeInterface;
use Sabre\VObject;
use Sabre\VObject\Recur\EventIterator;
use Sabre\VObject\Recur\NoInstancesException;

/**
 * VEvent component.
 *
 * This component contains some additional functionality specific for VEVENT's.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class VEvent extends VObject\Component {

    /**
     * Returns true or false depending on if the event falls in the specified
     * time-range. This is used for filtering purposes.
     *
     * The rules used to determine if an event falls within the specified
     * time-range is based on the CalDAV specification.
     *
     * @param DateTimeInterface $start
     * @param DateTimeInterface $end
     *
     * @return bool
     */
    function isInTimeRange(DateTimeInterface $start, DateTimeInterface $end) {

        if ($this->RRULE) {

            try {

                $it = new EventIterator($this, null, $start->getTimezone());

            } catch (NoInstancesException $e) {

                // If we've catched this exception, there are no instances
                // for the event that fall into the specified time-range.
                return false;

            }

            $it->fastForward($start);

            // We fast-forwarded to a spot where the end-time of the
            // recurrence instance exceeded the start of the requested
            // time-range.
            //
            // If the starttime of the recurrence did not exceed the
            // end of the time range as well, we have a match.
            return ($it->getDTStart() < $end && $it->getDTEnd() > $start);

        }

        $effectiveStart = $this->DTSTART->getDateTime($start->getTimezone());
        if (isset($this->DTEND)) {

            // The DTEND property is considered non inclusive. So for a 3 day
            // event in july, dtstart and dtend would have to be July 1st and
            // July 4th respectively.
            //
            // See:
            // http://tools.ietf.org/html/rfc5545#page-54
            $effectiveEnd = $this->DTEND->getDateTime($end->getTimezone());

        } elseif (isset($this->DURATION)) {
            $effectiveEnd = $effectiveStart->add(VObject\DateTimeParser::parseDuration($this->DURATION));
        } elseif (!$this->DTSTART->hasTime()) {
            $effectiveEnd = $effectiveStart->modify('+1 day');
        } else {
            $effectiveEnd = $effectiveStart;
        }
        return (
            ($start < $effectiveEnd) && ($end > $effectiveStart)
        );

    }

    /**
     * This method should return a list of default property values.
     *
     * @return array
     */
    protected function getDefaults() {

        return [
            'UID'     => 'sabre-vobject-' . VObject\UUIDUtil::getUUID(),
            'DTSTAMP' => date('Ymd\\THis\\Z'),
        ];

    }

    /**
     * A simple list of validation rules.
     *
     * This is simply a list of properties, and how many times they either
     * must or must not appear.
     *
     * Possible values per property:
     *   * 0 - Must not appear.
     *   * 1 - Must appear exactly once.
     *   * + - Must appear at least once.
     *   * * - Can appear any number of times.
     *   * ? - May appear, but not more than once.
     *
     * @var array
     */
    function getValidationRules() {

        $hasMethod = isset($this->parent->METHOD);
        return [
            'UID'           => 1,
            'DTSTAMP'       => 1,
            'DTSTART'       => $hasMethod ? '?' : '1',
            'CLASS'         => '?',
            'CREATED'       => '?',
            'DESCRIPTION'   => '?',
            'GEO'           => '?',
            'LAST-MODIFIED' => '?',
            'LOCATION'      => '?',
            'ORGANIZER'     => '?',
            'PRIORITY'      => '?',
            'SEQUENCE'      => '?',
            'STATUS'        => '?',
            'SUMMARY'       => '?',
            'TRANSP'        => '?',
            'URL'           => '?',
            'RECURRENCE-ID' => '?',
            'RRULE'         => '?',
            'DTEND'         => '?',
            'DURATION'      => '?',

            'ATTACH'         => '*',
            'ATTENDEE'       => '*',
            'CATEGORIES'     => '*',
            'COMMENT'        => '*',
            'CONTACT'        => '*',
            'EXDATE'         => '*',
            'REQUEST-STATUS' => '*',
            'RELATED-TO'     => '*',
            'RESOURCES'      => '*',
            'RDATE'          => '*',
        ];

    }

}
