<?php
/**
 * Simple Tree Navigation Plugin
 * @author     Yves Fischer <yvesf-git@xapek.org>
 */ 
if(!defined('DOKU_INC')) die();
if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once DOKU_PLUGIN.'action.php';

/**
 * search_namespaces1
 * 
 * like search_namespaces but with limited depth to 1
 */
function treenav_search_namespaces(&$data,$base,$file,$type,$lvl,$opts){
    $opts['listdirs'] = true;
    $opts['depth'] = 1;
    return search_universal($data,$base,$file,$type,$lvl,$opts);
}

/**
 * Helper class to list Pages and Namespaces
 */
class treenav_NamespaceNode {
    public $name;
    public $level;
    public function __construct($name, $level) {
        $this->name = $name;
        $this->level = $level;
    }

    public function getPages() {
        global $conf;
        $data = array();
        search($data,$conf['datadir'], 'search_list', array(), str_replace(':','/', $this->name));
        return $data;
    }

    public function getChildren() {
        global $conf;
        $data = array();
        $childs = array();
        search($data,$conf['datadir'], 'treenav_search_namespaces', array(), str_replace(':', '/', $this->name));
        foreach ($data as $ns) {
            $childs[] = new treenav_NamespaceNode($ns['id'], $this->level+1);
        }
        return $childs;
    }
}


/**
 * DokuWiki Action Plugin. Inserts Tree Navigation in div "page" and wraps
 * actual page in div "inner__page"
 */
class action_plugin_treenav extends DokuWiki_Action_Plugin {
    function register(&$controller) {
        $controller->register_hook('TPL_ACT_RENDER', 'BEFORE', $this,
                                   'hook_beforePage');
        $controller->register_hook('TPL_ACT_RENDER', 'AFTER', $this,
                                   'hook_afterPage');
    }


    function hook_beforePage(&$event, $param) {
        global $ID;
        $deps = p_get_metadata($id, 'treenav_deps', true);
        $cache = new cache(cleanID($ID), 'plugin_treenav');
        
        if (count($deps)>0 && $cache->useCache($deps)) {
            $doc = $cache->retrieveCache(false);
        } else {
            $deps = array('files' => array());
            $root = new treenav_NamespaceNode('',0);

            $renderer =& p_get_renderer('xhtml');
            $renderer->listu_open();
            $this->_print($root, $renderer, $deps);
            $renderer->listu_close();
            $doc = $renderer->doc;

            $cache->storeCache($doc);
            p_set_metadata($id, array('treenav_deps' => $deps));
        }

        echo '<div class="treenav">' . DOKU_LF . $doc . DOKU_LF . '</div>';
        echo '<div class="page__inner">' . DOKU_LF;

        tpl_flush();
    }

    function hook_afterPage(&$event, $param) {
        echo '</div>' . DOKU_LF;
    }

    function _print($node, &$renderer, &$deps) {
        global $ID;
        foreach ($node->getChildren() as $child) {
            foreach ($child->getPages() as $page) {
                if (noNS($page['id']) === 'start') {
                    $renderer->listitem_open();
                    $deps['files'][] = wikiFN($page['id']); // Add page file to dependencies
                    $this->_renderPagelink($page['id'], $renderer);
                    if (strpos(getNS($ID), $child->name) === 0) {
                        // Recursive Call with Sub-Namespace that contains
                        // current Page ($ID)
                        $renderer->listu_open();
                        $this->_print($child, $renderer, $deps);
                        $renderer->listu_close();
                    }
                    $renderer->listitem_close();
                }
            }
        }

        foreach ($node->getPages() as $page) {
            if (noNS($page['id']) == 'start' && getNS($page['id']) != '')
                continue;
            $renderer->listitem_open();
            $deps['files'][] = wikiFN($page['id']); // Add page file to dependencies
            $this->_renderPagelink($page['id'], $renderer);
            $renderer->listitem_close();
        }
    }

    function _renderPagelink($id, &$renderer) {
        global $conf;

        $id = ':' . cleanID($id);
        $options = p_get_metadata($id, 'treenav');

        // Icon
        $iconID = $options['icon'];
        if ($iconID) {
            resolve_mediaid(getNS($id), $iconID, $exists);
        }
        if ($iconID && $exists) {
            $link = ml($iconID, array('h'=>16, 'cache'=>NULL));
        } else {
            if (noNS($id) === $conf['start'] && getNS($id) !== '') {
                $link = DOKU_REL . 'lib/plugins/treenav/images/zoom-in-symbolic.png';
            } else {
                $link = DOKU_REL . 'lib/plugins/treenav/images/go-next-symbolic.png';
            }
        }
        $renderer->doc .= '<img height="16" src="'.$link.'" class="media" />' . DOKU_LF;

        if ($options['title']) {
            $title = $options['title'];
        } else {
            $title = p_get_first_heading($id);
        }

        $renderer->internallink($id, $title);
    }
}


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