<?php // -*-php-*-
rcs_id('$Id: Calendar.php,v 1.19 2002-02-08 22:38:21 dairiki Exp $');

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)?
//
//   o Docs.  Write a pgsrc/CalendarPlugin.
//
// 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].',
                     'date_format'	=> '%Y-%m-%d',
                     'year'		=> '',
                     'month'		=> '',
                     'month_offset'	=> 0,

                     'month_format'	=> '%B, %Y',
                     'wday_format'	=> '%a',
                     'start_wday'	=> '0');
    }

    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' => 7,
                                       'align'   => 'center'),
                                 HTML::table(array('width' => '100%',
                                                   'class' => 'cal-header'), $row)));
    }


    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'];
        $row = HTML::tr();
        for ($i = 0; $i < 7; $i++) {
            $row->pushContent(HTML::td(array('class' => 'cal-dayname',
                                             'align' => 'center'),
                                       strftime($fs, $time)));
            $time += SECONDS_PER_DAY;
        }
        return $row;
    }

    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');
        }

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

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

        $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'),
                           $this->__header($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;
        
        
        $row = HTML::tr();
        
        $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) {
                $cal->pushContent($row);
                $col = 0;
                $row = HTML::tr();
            }

            $time += SECONDS_PER_DAY;
            $t     = localtime($time, 1);
            $done  = $t['tm_mday'] == 1;
        }

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

// For emacs users
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>