<?php

require_once('inc/session.inc.php');

class User
{

	private static $user = false;

	public static function isLoggedIn()
	{
		return self::$user !== false;
	}

	public static function getId()
	{
		if (!self::isLoggedIn())
			return false;
		return self::$user['userid'];
	}

	public static function getName()
	{
		if (!self::isLoggedIn())
			return false;
		return self::$user['fullname'];
	}

	public static function hasPermission($permission, $locationid = NULL)
	{
		if (!self::isLoggedIn())
			return false;
		if (Module::isAvailable("permissionmanager")) {
			$module = Page::getModule();
			$permission = $module ? $module->getIdentifier().".".$permission : $permission;
			return PermissionUtil::userHasPermission(self::$user['userid'], $permission, $locationid);
		}
		if (self::$user['permissions'] & Permission::get('superadmin'))
			return true;
		return (self::$user['permissions'] & Permission::get($permission)) != 0;
	}

	public static function getAllowedLocations($permission)
	{
		if (Module::isAvailable("permissionmanager")) {
			$module = Page::getModule();
			$permission = $module ? $module->getIdentifier().".".$permission : $permission;
			return PermissionUtil::getAllowedLocations(self::$user['userid'], $permission);
		}
		if (self::$user['permissions'] & Permission::get('superadmin'))
			return array_keys(Location::getLocationsAssoc());
		return array();
	}

	public static function load()
	{
		if (self::isLoggedIn())
			return true;
		if (Session::load()) {
			$uid = Session::get('uid');
			if ($uid === false || $uid < 1)
				self::logout();
			self::$user = Database::queryFirst('SELECT * FROM user WHERE userid = :uid LIMIT 1', array(':uid' => $uid));
			if (self::$user === false)
				self::logout();
			return true;
		}
		return false;
	}

	public static function testPassword($userid, $password)
	{
		$ret = Database::queryFirst('SELECT passwd FROM user WHERE userid = :userid LIMIT 1', compact('userid'));
		if ($ret === false)
			return false;
		return Crypto::verify($password, $ret['passwd']);
	}

	public static function updatePassword($password)
	{
		if (!self::isLoggedIn())
			return false;
		$passwd = Crypto::hash6($password);
		$userid = self::getId();
		return Database::exec('UPDATE user SET passwd = :passwd WHERE userid = :userid LIMIT 1', compact('userid', 'passwd')) > 0;
	}

	public static function login($user, $pass)
	{
		$ret = Database::queryFirst('SELECT userid, passwd FROM user WHERE login = :user LIMIT 1', array(':user' => $user));
		if ($ret === false)
			return false;
		if (!Crypto::verify($pass, $ret['passwd']))
			return false;
		Session::create($ret['passwd']);
		Session::set('uid', $ret['userid']);
		Session::set('token', md5($ret['passwd'] . ','
			. rand() . ','
			. time() . ','
			. rand() . ','
			. $_SERVER['REMOTE_ADDR'] . ','
			. rand() . ','
			. $_SERVER['REMOTE_PORT'] . ','
			. rand() . ','
			. $_SERVER['HTTP_USER_AGENT']));
		Session::save();
		return true;
	}

	public static function logout()
	{
		Session::delete();
		Header('Location: ?do=Main&fromlogout');
		exit(0);
	}

	public static function setLastSeenEvent($eventid)
	{
		if (!self::isLoggedIn())
			return;
		Database::exec("UPDATE user SET lasteventid = :eventid WHERE userid = :userid LIMIT 1", array(
			'eventid' => $eventid,
			'userid' => self::$user['userid']
		));
		self::$user['lasteventid'] = $eventid;
	}

	public static function getLastSeenEvent()
	{
		if (!self::isLoggedIn())
			return false;
		return self::$user['lasteventid'];
	}

}