<?php

declare(strict_types=1);

namespace Sabre\DAV\Xml\Response;

use Sabre\Xml\Element;
use Sabre\Xml\Reader;
use Sabre\Xml\Writer;

/**
 * WebDAV MultiStatus parser.
 *
 * This class parses the {DAV:}multistatus response, as defined in:
 * https://tools.ietf.org/html/rfc4918#section-14.16
 *
 * And it also adds the {DAV:}synctoken change from:
 * http://tools.ietf.org/html/rfc6578#section-6.4
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class MultiStatus implements Element
{
    /**
     * The responses.
     *
     * @var \Sabre\DAV\Xml\Element\Response[]
     */
    protected $responses;

    /**
     * A sync token (from RFC6578).
     *
     * @var string
     */
    protected $syncToken;

    /**
     * Constructor.
     *
     * @param \Sabre\DAV\Xml\Element\Response[] $responses
     * @param string                            $syncToken
     */
    public function __construct(array $responses, $syncToken = null)
    {
        $this->responses = $responses;
        $this->syncToken = $syncToken;
    }

    /**
     * Returns the response list.
     *
     * @return \Sabre\DAV\Xml\Element\Response[]
     */
    public function getResponses()
    {
        return $this->responses;
    }

    /**
     * Returns the sync-token, if available.
     *
     * @return string|null
     */
    public function getSyncToken()
    {
        return $this->syncToken;
    }

    /**
     * The serialize method is called during xml writing.
     *
     * It should use the $writer argument to encode this object into XML.
     *
     * Important note: it is not needed to create the parent element. The
     * parent element is already created, and we only have to worry about
     * attributes, child elements and text (if any).
     *
     * Important note 2: If you are writing any new elements, you are also
     * responsible for closing them.
     */
    public function xmlSerialize(Writer $writer)
    {
        foreach ($this->getResponses() as $response) {
            $writer->writeElement('{DAV:}response', $response);
        }
        if ($syncToken = $this->getSyncToken()) {
            $writer->writeElement('{DAV:}sync-token', $syncToken);
        }
    }

    /**
     * The deserialize method is called during xml parsing.
     *
     * This method is called statically, this is because in theory this method
     * may be used as a type of constructor, or factory method.
     *
     * Often you want to return an instance of the current class, but you are
     * free to return other data as well.
     *
     * You are responsible for advancing the reader to the next element. Not
     * doing anything will result in a never-ending loop.
     *
     * If you just want to skip parsing for this element altogether, you can
     * just call $reader->next();
     *
     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
     * the next element.
     *
     * @return mixed
     */
    public static function xmlDeserialize(Reader $reader)
    {
        $elementMap = $reader->elementMap;
        $elementMap['{DAV:}prop'] = 'Sabre\\DAV\\Xml\\Element\\Prop';
        $elements = $reader->parseInnerTree($elementMap);

        $responses = [];
        $syncToken = null;

        if ($elements) {
            foreach ($elements as $elem) {
                if ('{DAV:}response' === $elem['name']) {
                    $responses[] = $elem['value'];
                }
                if ('{DAV:}sync-token' === $elem['name']) {
                    $syncToken = $elem['value'];
                }
            }
        }

        return new self($responses, $syncToken);
    }
}