<?php

/*
 * Copyright 2005 Reini Urban
 *
 * This file is part of PhpWiki.
 *
 * PhpWiki is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * PhpWiki is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with PhpWiki; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/**
 * SemanticRelations - Display the list of relations and attributes of given page(s).
 * Relations are stored in the link table.
 * Attributes as simple page meta-data.
 *
 * @author: Reini Urban
 * @see WikiPlugin_SemanticSearch
 */
class WikiPlugin_SemanticRelations
    extends WikiPlugin
{
    function getDescription()
    {
        return _("Display the list of relations and attributes on this page.");
    }

    function getDefaultArguments()
    {
        return array(
            'page' => "[pagename]", // which pages (glob allowed), default: current
            'relations' => '', // which relations. default all
            'attributes' => '', // which attributes. default all
            'units' => '', // ?
            'noheader' => false,
            'nohelp' => false
        );
    }

    function run($dbi, $argstr, &$request, $basepage)
    {
        global $WikiTheme;
        $args = $this->getArgs($argstr, $request);
        extract($args);
        if (empty($page))
            $page = $request->getArg('pagename');
        $relhtml = HTML();
        if ($args['relations'] != '') {
            $relfilter = explode(",", $args['relations']);
        } else
            $relfilter = array();
        if ($args['attributes'] != '') {
            $attfilter = explode(",", $args['attributes']);
        } else
            $attfilter = array();
        foreach (explodePageList($page) as $pagename) {
            $p = $dbi->getPage($pagename);
            if ($args['relations'] != '0') {
                $links = $p->getRelations(); // iter of pagelinks
                // TODO: merge same relations together located_in::here, located_in::there
                while ($object = $links->next()) {
                    if ($related = $object->get('linkrelation')) { // a page name
                        if ($relfilter and !in_array($related, $relfilter)) {
                            continue;
                        }
                        $rellink = WikiLink($related, false, $related);
                        $rellink->setAttr('class', $rellink->getAttr('class') . ' relation');
                        $relhtml->pushContent
                        ($pagename . " ",
                            // Link to a special "Relation:" InterWiki link?
                            $rellink,
                            HTML::span(array('class' => 'relation-symbol'), "::"), // use spaces?
                            WikiLink($object->_pagename),
                            " ",
                            // Link to SemanticSearch
                            $WikiTheme->makeActionButton(array('relation' => $related,
                                    's' => $object->_pagename),
                                '+',
                                _("SemanticSearch")),
                            (count($relfilter) > 3 ? HTML::br() : " "));
                    }
                }
                if (!empty($relhtml->_content) and !$noheader)
                    $relhtml = HTML(HTML::hr(),
                        HTML::h3(fmt("Semantic relations for %s", $pagename)),
                        $relhtml);
            }
            $atthtml = HTML();
            if ($args['attributes'] != '0') {
                if ($attributes = $p->get('attributes')) { // a hash of unique pairs
                    foreach ($attributes as $att => $val) {
                        if ($attfilter and !in_array($att, $attfilter)) continue;
                        $rellink = WikiLink($att, false, $att);
                        $rellink->setAttr('class', $rellink->getAttr('class') . ' relation');
                        $searchlink = $WikiTheme->makeActionButton
                        (array('attribute' => $att,
                                's' => $val),
                            $val,
                            _("SemanticSearch"));
                        $searchlink->setAttr('class', $searchlink->getAttr('class') . ' attribute');
                        if (!$noheader)
                            $atthtml->pushContent("$pagename  ");
                        $atthtml->pushContent(HTML::span(array('class' => 'attribute ' . $att),
                                $rellink,
                                HTML::span(array('class' => 'relation-symbol'),
                                    ":="),
                                $searchlink),
                            (count($attfilter) > 3 ? HTML::br() : " "));
                    }
                    if (!$noheader)
                        $relhtml = HTML($relhtml,
                            HTML::hr(),
                            HTML::h3(fmt("Attributes of %s", $pagename)),
                            $atthtml);
                    else
                        $relhtml = HTML($relhtml, $atthtml);
                }
            }
        }
        if ($nohelp) return $relhtml;
        return HTML($relhtml,
            HTML::hr(),
            WikiLink(__("Help").":".__("SemanticRelations"), false,
                HTML::em(_("Help")."/"._("SemanticRelations"))),
            " - ",
            HTML::em(_("Find out how to add relations and attributes to pages.")));
    }
}

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