<?php
/**
 * Datasource Sitemap: Page
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage datasource
 */

WBClass::load('WBDatasource_Sitemap'
        );

/**
 * Datasource Sitemap Page
 *
 * @version 0.1.0
 * @package WB
 * @subpackage datasource
 */
class WBDatasource_Sitemap_Page extends WBDatasource_Sitemap
{
    /**
     * Find all the URLs
     *
     * Walk through all the pages etc. to find all URLs to be added to the sitemap.
     */
    public function find()
    {
        $loader =   WBParam::get('wb/config/loader/service/site', 'File');
        $this->setPath('');
        $this->setPriority(1);
        $this->notify();

        if ($loader != 'File') {
            $this->configLoader =   WBClass::create('WBConfig_Loader_' . WBParam::get('wb/config/loader/service/site', 'File'));
            $this->addPages2Sitemap();
            return;
        }

        // add pages from page configuration folders
        $etcDir     =   WBParam::get('wb/dir/base')
                    .   '/'
                    .   WBParam::get( 'wb/dir/config', 'etc' );

        if (is_dir($etcDir . '/site/page')) {
            $this->addPageDir2Sitemap($etcDir . '/site/page');
        }
        $this->addPageDir2Sitemap($etcDir . '-default/site/page');
    }

    /**
     * list pages in sitemap
     *
     * Recursive method to load find all page configurations and add them
     * to sitemap.
     *
     * @param string $path
     */
    private function addPages2Sitemap($path = '')
    {
        $path   =   trim($path, '/');
        $branch =   array_pop(explode('/', $path));
        if (strncmp('__', $branch, 2) == 0) {
            return;
        }

        $prio   =   1.1 - (count(explode('/', $path)) / 10);
        $this->setPath($path);
        $this->setPriority($prio);
        $this->notify();

        // try to find children
        if (!empty($path)) {
            $path   =   '/' . $path;
        }
        $children   =   $this->configLoader->ls('site/page' . $path);
        if (empty($children)) {
            return;
        }

        foreach ($children as $child) {
            $child  =   substr($child, 10);
            $this->addPages2Sitemap($child);
        }
    }

    /**
     * add pages to sitemap
     *
     * Recursively scans folder for page definitions. It also makes sure, that each page
     * will be added just once.
     *
     * @uses display()
     * @param string $dir
     * @param string $prefix
     * @todo move to WBConfig_Loader_File
     */
    protected function addPageDir2Sitemap($dir, $prefix = '')
    {
        $iter   =   new DirectoryIterator($dir);
        foreach ($iter as $page) {
            if ($page->isDot()) {
                continue;
            }

            if ($page->isDir()) {
                $this->addPageDir2Sitemap($page->getPathname(), $prefix . $page->getFilename() . '/');
                continue;
            }

            $name   =   explode('.', $page->getFilename());
            if (array_pop($name) != 'xml') {
                continue;
            }
            $name   =   implode('.', $name);

            // skip index and default pages
            if (strncmp($name, '__', 2) == 0) {
                continue;
            }
            $path   =   $prefix . $name;

            $prio   =   1.1 - (count(explode('/', $path)) / 10);
            $this->setPath($path);
            $this->setPriority($prio);
            $this->notify();
        }
    }

}