<?php

namespace Sabre\VObject\Property\ICalendar;

use Sabre\VObject\DateTimeParser;
use Sabre\VObject\Property;
use Sabre\Xml;

/**
 * Period property.
 *
 * This object represents PERIOD values, as defined here:
 *
 * http://tools.ietf.org/html/rfc5545#section-3.8.2.6
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Period extends Property
{
    /**
     * In case this is a multi-value property. This string will be used as a
     * delimiter.
     *
     * @var string
     */
    public $delimiter = ',';

    /**
     * Sets a raw value coming from a mimedir (iCalendar/vCard) file.
     *
     * This has been 'unfolded', so only 1 line will be passed. Unescaping is
     * not yet done, but parameters are not included.
     *
     * @param string $val
     */
    public function setRawMimeDirValue($val)
    {
        $this->setValue(explode($this->delimiter, $val));
    }

    /**
     * Returns a raw mime-dir representation of the value.
     *
     * @return string
     */
    public function getRawMimeDirValue()
    {
        return implode($this->delimiter, $this->getParts());
    }

    /**
     * Returns the type of value.
     *
     * This corresponds to the VALUE= parameter. Every property also has a
     * 'default' valueType.
     *
     * @return string
     */
    public function getValueType()
    {
        return 'PERIOD';
    }

    /**
     * Sets the json value, as it would appear in a jCard or jCal object.
     *
     * The value must always be an array.
     */
    public function setJsonValue(array $value)
    {
        $value = array_map(
            function ($item) {
                return strtr(implode('/', $item), [':' => '', '-' => '']);
            },
            $value
        );
        parent::setJsonValue($value);
    }

    public function appendUtc(string $strDate)
    {
        return !str_ends_with($strDate, 'Z') ? '' : 'Z';
    }

    /**
     * Returns the value, in the format it should be encoded for json.
     *
     * This method must always return an array.
     *
     * @return array
     */
    public function getJsonValue()
    {
        $return = [];
        foreach ($this->getParts() as $item) {
            list($start, $end) = explode('/', $item, 2);

            $startDt = DateTimeParser::parseDateTime($start)->format('Y-m-d\\TH:i:s').$this->appendUtc($start);

            // This is a duration value.
            if ('P' === $end[0]) {
                $return[] = [
                    $startDt,
                    $end,
                ];
            } else {
                $endDt = DateTimeParser::parseDateTime($end)->format('Y-m-d\\TH:i:s').$this->appendUtc($end);
                $return[] = [
                    $startDt,
                    $endDt,
                ];
            }
        }

        return $return;
    }

    /**
     * This method serializes only the value of a property. This is used to
     * create xCard or xCal documents.
     *
     * @param Xml\Writer $writer XML writer
     */
    protected function xmlSerializeValue(Xml\Writer $writer)
    {
        $writer->startElement(strtolower($this->getValueType()));
        $value = $this->getJsonValue();
        $writer->writeElement('start', $value[0][0]);

        if ('P' === $value[0][1][0]) {
            $writer->writeElement('duration', $value[0][1]);
        } else {
            $writer->writeElement('end', $value[0][1]);
        }

        $writer->endElement();
    }
}
