<?php
/**
 * Kunena Component
* @package Kunena.Installer
*
* @copyright (C) 2008 - 2013 Kunena Team. All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
* @link http://www.kunena.org
**/
defined ( '_JEXEC' ) or die ();

class KunenaMigratorFireboard {
	protected $versions = array (
		array ('version' => '1.0.4', 'date' => '2007-12-23', 'table' => 'fb_sessions', 'column' => 'currvisit' ),
		array ('version' => '1.0.3', 'date' => '2007-09-04', 'table' => 'fb_categories', 'column' => 'headerdesc' ),
		array ('version' => '1.0.2', 'date' => '2007-08-03', 'table' => 'fb_users', 'column' => 'rank' ),
		array ('version' => '1.0.1', 'date' => '2007-05-20', 'table' => 'fb_users', 'column' => 'uhits' ),
		array ('version' => '1.0.0', 'date' => '2007-04-15', 'table' => 'fb_messages', 'column' => 'id' ),
	);

	public static function getInstance() {
		static $instance = null;
		if(!$instance) $instance = new KunenaMigratorFireboard();
		return $instance;
	}

	/**
	 * Detect FireBoard version.
	 *
	 * @return  string  FireBoard version or null.
	*/
	public function detect() {
		// Check if FireBoard can be found from the Joomla installation.
		if (KunenaInstaller::detectTable('fb_version')) {
			// Get installed version.
			$db = JFactory::getDBO();
			$db->setQuery("SELECT version, versiondate AS date FROM #__fb_version ORDER BY id DESC", 0, 1);
			$version = $db->loadRow();

			// Do not detect Kunena 1.x.
			if ($version && version_compare($version->version, '1.0.5', '>')) return null;
			// Return FireBoard version.
			if ($version->version) return $version->version;
		}
		foreach ($this->versions as $version) {
			if (KunenaInstaller::getTableColumn($version['table'], $version['column'])) {
				return $version->version;
			}
		}

		return null;
	}
}