<?php

/**
 * Copyright 1999,2000,2001,2002,2007 $ThePhpWikiProgrammingTeam
 *
 * 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.
 */

if (!defined('SECONDS_PER_DAY'))
    define('SECONDS_PER_DAY', 24 * 3600);

// FIXME: Still needs:
//
//   o Better way to navigate to distant months.
//     (Maybe a form with selectors for month and year)?
//
// It would be nice to have some way to get from the individual date
// pages back to the calendar page. (Subpage support might make this
// easier.)

class WikiPlugin_Calendar
    extends WikiPlugin
{
    function getName()
    {
        return _("Calendar");
    }

    function getDescription()
    {
        return _("Calendar");
    }

    function getDefaultArguments()
    {
        return array('prefix' => '[pagename]' . SUBPAGE_SEPARATOR,
            'date_format' => '%Y-%m-%d',
            'year' => '',
            'month' => '',
            'month_offset' => 0,
            'month_format' => '%B %Y',
            'wday_format' => '%a',
            'start_wday' => '1', // start now with Monday
            'display_weeknum' => 0);
    }

    /**
     * return links (static only as of action=edit)
     *
     * @param  string $argstr   The plugin argument string.
     * @param  string $basepage The pagename the plugin is invoked from.
     * @return array  List of pagenames linked to (or false).
     */
    function getWikiPageLinks($argstr, $basepage)
    {
        if (isset($this->_links))
            return $this->_links;
        else {
            global $request;
            $this->run($request->_dbi, $argstr, $request, $basepage);
            return $this->_links;
        }
    }

    private function __header($pagename, $time)
    {
        $args = &$this->args;

        $t = localtime($time - SECONDS_PER_DAY, 1);
        $prev_url = WikiURL($pagename, array('month' => $t['tm_mon'] + 1,
            'year' => $t['tm_year'] + 1900));

        $t = localtime($time + 32 * SECONDS_PER_DAY, 1);
        $next_url = WikiURL($pagename, array('month' => $t['tm_mon'] + 1,
            'year' => $t['tm_year'] + 1900));

        $prev = HTML::a(array('href' => $prev_url,
                'class' => 'cal-arrow',
                'title' => _("Previous Month")),
            '<');
        $next = HTML::a(array('href' => $next_url,
                'class' => 'cal-arrow',
                'title' => _("Next Month")),
            '>');

        $row = HTML::tr(HTML::td(array('align' => 'left'), $prev),
            HTML::td(array('align' => 'center'),
                HTML::strong(array('class' => 'cal-header'),
                    strftime($args['month_format'],
                        $time))),
            HTML::td(array('align' => 'right'), $next));

        return HTML::tr(HTML::td(array('colspan' => $args['display_weeknum'] ? 8 : 7,
                'align' => 'center'),
            HTML::table(array('width' => '100%',
                    'class' => 'cal-header'),
                $row)));
    }

    private function __daynames($start_wday)
    {
        $time = mktime(12, 0, 0, 1, 1, 2001);
        $t = localtime($time, 1);
        $time += (7 + $start_wday - $t['tm_wday']) * SECONDS_PER_DAY;

        $t = localtime($time, 1);
        assert($t['tm_wday'] == $start_wday);

        $fs = $this->args['wday_format'];
        $row = HTML::tr();
        $row->setattr('class', 'cal-dayname');
        if ($this->args['display_weeknum'])
            $row->pushContent(HTML::td(array('class' => 'cal-dayname',
                    'align' => 'center'),
                _("Wk")));
        for ($i = 0; $i < 7; $i++) {
            $row->pushContent(HTML::td(array('class' => 'cal-dayname',
                    'align' => 'center'),
                strftime($fs, $time)));
            $time += SECONDS_PER_DAY;
        }
        return $row;
    }

    private function __date($dbi, $time)
    {
        $args = &$this->args;

        $page_for_date = $args['prefix'] . strftime($args['date_format'],
            $time);
        $t = localtime($time, 1);

        $td = HTML::td(array('align' => 'center'));

        $mday = $t['tm_mday'];
        if ($mday == $this->_today) {
            $mday = HTML::strong($mday);
            $td->setAttr('class', 'cal-today');
        } elseif ($dbi->isWikiPage($page_for_date)) {
            $this->_links[] = $page_for_date;
            $td->setAttr('class', 'cal-day');
        }

        if ($dbi->isWikiPage($page_for_date)) {
            $this->_links[] = $page_for_date;
            $date = HTML::a(array('class' => 'cal-day',
                    'href' => WikiURL($page_for_date),
                    'title' => $page_for_date),
                HTML::em($mday));
        } else {
            $date = HTML::a(array('class' => 'cal-hide',
                    'rel' => 'nofollow',
                    'href' => WikiURL($page_for_date,
                        array('action' => 'edit')),
                    'title' => sprintf(_("Edit %s"),
                        $page_for_date)),
                $mday);
        }
        $td->pushContent(HTML::raw('&nbsp;'), $date, HTML::raw('&nbsp;'));
        return $td;
    }

    function run($dbi, $argstr, &$request, $basepage)
    {
        $this->args = $this->getArgs($argstr, $request);
        $args = &$this->args;
        $this->_links = array();

        $now = localtime(time() + 3600 * $request->getPref('timeOffset'), 1);
        foreach (array('month' => $now['tm_mon'] + 1,
                     'year' => $now['tm_year'] + 1900)
                 as $param => $dflt) {

            if (!($args[$param] = intval($args[$param])))
                $args[$param] = $dflt;
        }

        $time = mktime(12, 0, 0, // hh, mm, ss,
            $args['month'] + $args['month_offset'], // month (1-12)
            1, // mday (1-31)
            $args['year']);

        $cal = HTML::table(array('cellspacing' => 0,
                'cellpadding' => 2,
                'class' => 'cal'),
            HTML::thead(
                $this->__header($request->getArg('pagename'),
                    $time),
                $this->__daynames($args['start_wday'])));

        $t = localtime($time, 1);

        if ($now['tm_year'] == $t['tm_year'] && $now['tm_mon'] == $t['tm_mon'])
            $this->_today = $now['tm_mday'];
        else
            $this->_today = false;

        $tbody = HTML::tbody();
        $row = HTML::tr();

        if ($args['display_weeknum'])
            $row->pushContent(HTML::td(array('class' => 'cal-weeknum'),
                ((int)strftime("%U", $time)) + 1)); // %U problem. starts with 0
        $col = (7 + $t['tm_wday'] - $args['start_wday']) % 7;
        if ($col > 0)
            $row->pushContent(HTML::td(array('colspan' => $col)));
        $done = false;
        while (!$done) {
            $row->pushContent($this->__date($dbi, $time));

            if (++$col % 7 == 0) {
                $tbody->pushContent($row);
                $col = 0;
                $row = HTML::tr();
            }

            $time += SECONDS_PER_DAY;
            $t = localtime($time, 1);
            $done = $t['tm_mday'] == 1;
            if (!$col and !$done and $args['display_weeknum'])
                $row->pushContent(HTML::td(array('class' => 'cal-weeknum'),
                    ((int)strftime("%U", $time)) + 1)); // starts with 0
        }

        if ($row->getContent()) {
            $row->pushContent(HTML::td(array('colspan' => (42 - $col) % 7)));
            $tbody->pushContent($row);
        }
        $cal->pushContent($tbody);
        return $cal;
    }
}

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