<?php

namespace Sabre\DAVACL\Xml\Property;

use Sabre\DAV\Browser\HtmlOutput;
use Sabre\DAV\Browser\HtmlOutputHelper;
use Sabre\Xml\XmlSerializable;
use Sabre\Xml\Writer;

/**
 * SupportedPrivilegeSet property
 *
 * This property encodes the {DAV:}supported-privilege-set property, as defined
 * in rfc3744. Please consult the rfc for details about it's structure.
 *
 * This class expects a structure like the one given from
 * Sabre\DAVACL\Plugin::getSupportedPrivilegeSet as the argument in its
 * constructor.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {

    /**
     * privileges
     *
     * @var array
     */
    protected $privileges;

    /**
     * Constructor
     *
     * @param array $privileges
     */
    function __construct(array $privileges) {

        $this->privileges = $privileges;

    }

    /**
     * Returns the privilege value.
     *
     * @return array
     */
    function getValue() {

        return $this->privileges;

    }

    /**
     * The xmlSerialize metod is called during xml writing.
     *
     * Use the $writer argument to write its own xml serialization.
     *
     * An important note: do _not_ create a parent element. Any element
     * implementing XmlSerializble should only ever write what's considered
     * its 'inner xml'.
     *
     * The parent of the current element is responsible for writing a
     * containing element.
     *
     * This allows serializers to be re-used for different element names.
     *
     * If you are opening new elements, you must also close them again.
     *
     * @param Writer $writer
     * @return void
     */
    function xmlSerialize(Writer $writer) {

        $this->serializePriv($writer, '{DAV:}all', [ 'aggregates' => $this->privileges]);

    }

    /**
     * Generate html representation for this value.
     *
     * The html output is 100% trusted, and no effort is being made to sanitize
     * it. It's up to the implementor to sanitize user provided values.
     *
     * The output must be in UTF-8.
     *
     * The baseUri parameter is a url to the root of the application, and can
     * be used to construct local links.
     *
     * @param HtmlOutputHelper $html
     * @return string
     */
    function toHtml(HtmlOutputHelper $html) {

        $traverse = function($privName, $priv) use (&$traverse, $html) {
            echo "<li>";
            echo $html->xmlName($privName);
            if (isset($priv['abstract']) && $priv['abstract']) {
                echo " <i>(abstract)</i>";
            }
            if (isset($priv['description'])) {
                echo " " . $html->h($priv['description']);
            }
            if (isset($priv['aggregates'])) {
                echo "\n<ul>\n";
                foreach ($priv['aggregates'] as $subPrivName => $subPriv) {
                    $traverse($subPrivName, $subPriv);
                }
                echo "</ul>";
            }
            echo "</li>\n";
        };

        ob_start();
        echo "<ul class=\"tree\">";
        $traverse('{DAV:}all', [ 'aggregates' => $this->getValue() ]);
        echo "</ul>\n";

        return ob_get_clean();

    }



    /**
     * Serializes a property
     *
     * This is a recursive function.
     *
     * @param Writer $writer
     * @param array $privilege
     * @return void
     */
    private function serializePriv(Writer $writer, $privName, $privilege) {

        $writer->startElement('{DAV:}supported-privilege');

        $writer->startElement('{DAV:}privilege');
        $writer->writeElement($privName);
        $writer->endElement(); // privilege

        if (!empty($privilege['abstract'])) {
            $writer->writeElement('{DAV:}abstract');
        }
        if (!empty($privilege['description'])) {
            $writer->writeElement('{DAV:}description', $privilege['description']);
        }
        if (isset($privilege['aggregates'])) {
            foreach ($privilege['aggregates'] as $subPrivName => $subPrivilege) {
                $this->serializePriv($writer, $subPrivName, $subPrivilege);
            }
        }

        $writer->endElement(); // supported-privilege

    }

}
