<?php

require_once 'classes/LightPressPlugin.php';


class CategoriesList extends LightPressPlugin {
    
    var $constructor_args = array('nested'=>'Use a nested list instead of using sidebar headers formatting for top-level categories');
    var $default_context = LP_CONTEXT_ALL;
    var $description = 'Display a list of active categories';
    
    
    var $active = true;
    var $hooks = array('sidebar');
    
    var $nested = false;
    
    function CategoriesList(&$frontend, $args, $dummy_run=false) {
        $this->LightPressPlugin($frontend, $args, $dummy_run);
    }
    
    function run($hook, &$hook_data) {

        $tpl =& $this->_frontend->tpl;
        
        // cache code starts here
        $cache =& $this->_frontend->cache;
        if ($cache && $cache->active) {
            // try to fetch the cached snippet
            $result = $cache->getCache('_plugin_categorieslist','');
            if ($result) {
                $tpl->setVar('PLUGIN_CATEGORIESLIST', $result);
                return;
            }
        }       
        
        $tpl->setFile('plugin_categorieslist', 'plugins/categories_list' . ($this->nested ? '_nested' : '') . '.xml');
        $tpl->setBlock('plugin_categorieslist', 'plugin_categorieslist_catgroup', 'PLUGIN_CATEGORIESLIST_CATGROUP');
        $tpl->setBlock('plugin_categorieslist', 'plugin_categorieslist_category', 'PLUGIN_CATEGORIESLIST_CATEGORY');
        
        $categories =& $this->_getCategories();
        
        if (count($categories) == 0)
            return $this->hide();
        
        $buffer = '';
        
        foreach ($categories as $k=>$cat) {
            if (!$cat['root']) {
                // not a first-level category, continue
                continue;
            }
            $buffer .= $this->_parseCategory($tpl, $cat, $buffer);
        }
        $tpl->setVar(array(
            'plugin_categorieslist_header'      => $this->_frontend->messages['categories_header'],
            'PLUGIN_CATEGORIESLIST_CATGROUP'    => '',
            'PLUGIN_CATEGORIESLIST_CATEGORY'    => $buffer));
        $tpl->parse('PLUGIN_CATEGORIESLIST', 'plugin_categorieslist');
        
		if ($cache && $cache->active)
            $cache->setCache($tpl->_vars['PLUGIN_CATEGORIESLIST'], '_plugin_categorieslist','');

    }
    
    function _parseCategory(&$tpl, &$cat) {
        
        if (count($cat['children']) > 0) {
            // parent, start by rendering children
            $buffer = '';
            foreach ($cat['children'] as $k=>$child)
                $buffer .= $this->_parseCategory($tpl, $child);
            $tpl->setVar(array(
                'plugin_categorieslist_category_children'   => $buffer,
                'plugin_categorieslist_category_permalink'  => $cat['category_permalink'],
                'plugin_categorieslist_category_name'       => $cat['cat_name'],
                'plugin_categorieslist_category_numposts'   => $cat['numposts']));
            return $tpl->parse('PLUGIN_CATEGORIESLIST_TMP', 'plugin_categorieslist_catgroup');
        } else if ($cat['numposts'] > 0) {
            // normal category with posts
            $tpl->setVar(array(
                'plugin_categorieslist_category_permalink'  => $cat['category_permalink'],
                'plugin_categorieslist_category_name'       => $cat['cat_name'],
                'plugin_categorieslist_category_numposts'   => $cat['numposts']));
            return $tpl->parse('PLUGIN_CATEGORIESLIST_TMP', 'plugin_categorieslist_category');
        }
        return '';
    }
    
    function &_getCategories() {
        
        // build the categories tree
        $categories = array();
        $deferreds = array();
        
        if (!$this->nested) {
            // emulate a top-level category
            $categories['0'] = array(
                'root'                  => true,
                'cat_name'              => $this->_frontend->messages['categories_header'],
                'category_permalink'    => '',
                'numposts'              => '',
                'children'              => array());
        }
        
        foreach ($this->_frontend->getCategories() as $cat_id=>$cat) {
            
            $parent = $cat['category_parent'];
            $cat['root'] = ($parent === '0');

            $cat['children'] = array();
            
            $cat['numposts'] = (int)$cat['numposts'];

 	        $categories[$cat_id] = $cat;

            if (!empty($parent)) {
	            if (isset($categories[$parent]))
 	                $categories[$parent]['children'][$cat['cat_name']] =& $categories[$cat['cat_id']];
 	            else
 	                $deferreds[$cat_id] = array($parent, $cat_id);
 	        }
        }
        
        foreach ($deferreds as $k) {
            list($parent, $cat_id) = $k;
            $cat =& $categories[$cat_id];
            if (isset($categories[$parent])) {
                $categories[$parent]['children'][$cat['cat_name']] =& $categories[$cat_id];
            } else {
                $categories[$cat['cat_id']]['category_parent'] = '0';
                $categories[$cat['cat_id']]['root'] = true;
            }
        }
        
        if (!$this->nested) {
            // move non-parent top-level categories as children of the new top-level
            foreach ($categories as $k=>$v) {
                if ($k != '0' && $v['category_parent'] == '0' && count($v['children']) == 0) {
                    $categories[$k]['root'] = false;
                    $categories['0']['children'][$v['cat_name']] = $v;
                }
            }
        }
        
        //require_once 'classes/Var_Dump.php';
        //Var_Dump::display($categories);
        return $categories;
        
    }
    
}

?>