<?php
/**
 * Copyright 2009, 2010 AEGEE-Europe
 *
 * This file is part of AEGEE-Europe Online Membership System.
 *
 * AEGEE-Europe Online Membership System is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * AEGEE-Europe Online Membership System is distributed in the hope
 * that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AEGEE-Europe Online Membership System.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

/**
 * General access levels
 *
 * @version		1.0
 * @date		27.11.2009
 * @author		Wim van Ravesteijn
 * @license		http://opensource.org/licenses/gpl-license.php GNU Public License
 */
abstract class Access {
	const ADMIN = 999;	// administrator
	const BOARD = 400;	// board member of any local
	const MEMBER = 300;	// normal AEGEE member (and nowhere board member)
	const ANCIEN = 200;	// AEGEE ancien (alumni)
	const VISITOR = 100;	// Logged in visitor (not confirmed member of any local)
	const ANONYMOUS = 0;	// Anonymous user

	/**
	 * Get a textual representation of the provided access level
	 *
	 * @param int access: access level
	 * @return string: textual representation of the access level
	 */
	public static function getAccess($access) {
		switch( $access ) {
			case	self::ADMIN:			return "Administrator";	break;
			case	self::BOARD:			return "Board";					break;
			case	self::MEMBER:			return "Member";				break;
			case	self::ANCIEN:			return "Ancien";				break;
			case	self::VISITOR:		return "Visitor";				break;
			case	self::ANONYMOUS:	return "Anonymous";			break;
			default:								return "Unknown";				break;
		}
	}

	/**
	 * Get a numeric representation of the provided access level
	 *
	 * @param string access: textual representation of the access level
	 * @return int: access level or NULL in case the param isNotAccess
	 */
	public static function getAccessNumber($access) {
		switch( ucwords(strtolower($access) ) ) {
			case	"Administrator":	return self::ADMIN;			break;
			case	"Board":					return self::BOARD;			break;
			case	"Member":					return self::MEMBER;		break;
			case	"Ancien":					return self::ANCIEN;		break;
			case	"Visitor":				return self::VISITOR;		break;
			case	"Anonymous":			return self::ANONYMOUS;	break;
			default:								return NULL;						break;
		}
	}

	/**
	 * Check if the provided access level exists
	 *
	 * @param int access: access level
	 * @return boolean: true in case the access level exists, false otherwise
	 */
	public static function isAccess($access) {
		if ( ! is_numeric($access) ) return false;
		return in_array($access, self::getAccesses());
	}

	/**
	 * Get an array of all access levels
	 *
	 * @return array: array of all access levels currently supported
	 */
	public static function getAccesses() {
		return array(self::ANONYMOUS, self::VISITOR, self::ANCIEN, self::MEMBER, self::BOARD, self::ADMIN);
	}

	/**
	 * Check if the current logged in user has a certain access level
	 *
	 * @param int requiredLevel: required access level
	 * @return boolean: true in case user has required access level, false otherwise
	 */
	public static function hasAccess($requiredLevel) {
		if( self::isAccess($requiredLevel) AND $_SESSION['sess_access']>=$requiredLevel ) {
			return true;
		}else {
			return false;
		}
	}
}
?>