<?php

namespace Sabre\DAV\Browser;

use Sabre\Uri;
use Sabre\Xml\Service as XmlService;

/**
 * This class provides a few utility functions for easily generating HTML for
 * the browser plugin.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class HtmlOutputHelper {

    /**
     * Link to the root of the application.
     *
     * @var string
     */
    protected $baseUri;

    /**
     * List of xml namespaces.
     *
     * @var array
     */
    protected $namespaceMap;

    /**
     * Creates the object.
     *
     * baseUri must point to the root of the application. This will be used to
     * easily generate links.
     *
     * The namespaceMap contains an array with the list of xml namespaces and
     * their prefixes. WebDAV uses a lot of XML with complex namespaces, so
     * that can be used to make output a lot shorter.
     *
     * @param string $baseUri
     * @param array $namespaceMap
     */
    function __construct($baseUri, array $namespaceMap) {

        $this->baseUri = $baseUri;
        $this->namespaceMap = $namespaceMap;

    }

    /**
     * Generates a 'full' url based on a relative one.
     *
     * For relative urls, the base of the application is taken as the reference
     * url, not the 'current url of the current request'.
     *
     * Absolute urls are left alone.
     *
     * @param string $path
     * @return string
     */
    function fullUrl($path) {

        return Uri\resolve($this->baseUri, $path);

    }

    /**
     * Escape string for HTML output.
     *
     * @param string $input
     * @return string
     */
    function h($input) {

        return htmlspecialchars($input, ENT_COMPAT, 'UTF-8');

    }

    /**
     * Generates a full <a>-tag.
     *
     * Url is automatically expanded. If label is not specified, we re-use the
     * url.
     *
     * @param string $url
     * @param string $label
     * @return string
     */
    function link($url, $label = null) {

        $url = $this->h($this->fullUrl($url));
        return '<a href="' . $url . '">' . ($label ? $this->h($label) : $url) . '</a>';

    }

    /**
     * This method takes an xml element in clark-notation, and turns it into a
     * shortened version with a prefix, if it was a known namespace.
     *
     * @param string $element
     * @return string
     */
    function xmlName($element) {

        list($ns, $localName) = XmlService::parseClarkNotation($element);
        if (isset($this->namespaceMap[$ns])) {
            $propName = $this->namespaceMap[$ns] . ':' . $localName;
        } else {
            $propName = $element;
        }
        return "<span title=\"" . $this->h($element) . "\">" . $this->h($propName) . "</span>";

    }

}
