<?php
# Movable Type (r) Open Source (C) 2001-2010 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id: block.mtcategorynext.php 5151 2010-01-06 07:51:27Z takayama $

function smarty_block_mtcategorynext($args, $content, &$ctx, &$repeat) {
    $localvars = array('category', 'entries');
    $tag = $ctx->this_tag();
    if (($tag == 'mtcategoryprevious') || $tag == 'mtfolderprevious' || $tag == 'mtarchiveprevious') {
        $step = -1;
    } else {
        $step = 1;
    }

    if (!isset($content)) {
        $e = $ctx->stash('entry');
        if ($e) $cat = $e->category();
        $cat or $cat = $ctx->stash('category');
        $cat or $cat = $ctx->stash('archive_category');
        if (!$cat) return '';
        $needs_entries = $args['entries'];
        $class = 'category';
        if (isset($args['class'])) {
            $class = $args['class'];
        }
        $cats = _catx_load_categories($ctx, $cat, $class);
        if ($cats == null) {
            $repeat = false;
            return $content;
        }
        $idx = 0;
        foreach ($cats as $c) {
            if ($c->category_id == $cat->category_id) {
                $pos = $idx;
                break;
            }
            $idx++;
        }
        $repeat = false;
        if (isset($pos)) {
            $pos += $step;
            while (($pos >= 0) && ($pos < count($cats))) {
                if ($cats[$pos]->category_count == 0) {
                    if (isset($args['show_empty']) && $args['show_empty']) {
                    } else {
                        $pos += $step;
                        continue;
                    }
                }
                $ctx->localize($localvars);
                $ctx->stash('category', $cats[$pos]);
                if ($needs_entries) $ctx->stash('entries', null);
                $repeat = true;
                break;
            }
        }
    } else {
        $ctx->restore($localvars);
    }
    return $content;
}

function _catx_load_categories(&$ctx, $cat, $class) {
    $blog_id = $cat->category_blog_id;
    $parent = $cat->category_parent;
    $parent or $parent = 0;
    $cats = $ctx->stash('__cat_cache_'.$blog_id . '_' . $parent);
    if (!$cats) {
        $cats = $ctx->mt->db()->fetch_categories(array('blog_id' => $blog_id, 'parent' => $parent, 'show_empty' => 1, 'class' => $class));
        $ctx->stash('__cat_cache_'.$blog_id. '_' . $parent, $cats);
    }
    return $cats;
}
?>
