<?php

class Aulib

{

	private $obj = NULL;

	function Aulib()

	{

		$this->obj =& get_instance();

		$this->obj->load->model('aumodel');

		$this->obj->config->load('auconfig');

		if ($this->obj->config->item('au_language') != '') 

			$curLang = $this->obj->config->item('au_language');

		else

			$curLang = $this->obj->config->item('language');    

		$this->obj->lang->load('au', $curLang); 		

	}

	/*

	 * Return "welcome" string with link to login page

	 * Call this function every time on you main page 

	 */

	function getLoginLink()

	{

		$id = $this->getSessionId();

		if($id)

		{

			$logoff_link = $this->obj->lang->line('logout_link_name');

			$welcome_str = $this->obj->lang->line('welcome_string');

			if($welcome_str != '')

			{

				$welcome_str = str_replace('%name%', $this->obj->aumodel->userInfo($id, 'name'), $welcome_str);

				$welcome_str = str_replace('%logoff%', anchor('au/logout',$logoff_link), $welcome_str);

			}

			return $welcome_str;

		}

		else

		{ 

			$login_link = $this->obj->lang->line('login_link_name');

			$registers_link = $this->obj->lang->line('registers_link_name');

			$login_str = $this->obj->lang->line('login_string');

			if($login_str != '')

			{

				$login_str = str_replace('%registers%', anchor('au/registers',$registers_link), $login_str);

				$login_str = str_replace('%login%', anchor('au/login',$login_link), $login_str);

			}

			return $login_str;

		} 

	}

	/*

	 * Return link for call back-end system

	 * This back-end can help you manage users & groups

	 */

	function getManagerLink()

	{

		return anchor('aumanager', $this->obj->lang->line('manager_link_name'));

	}

	/*

	 * function block for set/get session userID

	 */

	function setSessionId($id, $storable = FALSE)

	{

		if( $id < 1 ) 

		{

			$this->obj->session->unset_userdata('id');

			$this->obj->session->unset_userdata('flash');

		}

		else

		{

			$this->obj->session->set_userdata('flash', !$storable);

			$offset = (int) $this->obj->config->item('id_offset');

			 if($storable) 

				$this->obj->session->set_userdata('id', $id * $offset);

		 	else 

		 	{

		 		$this->obj->session->set_flashdata('id', $id * $offset);

		 		$this->obj->session->set_flashdata('expire', time()+$this->obj->config->item('autologin_timeout'));

		 	}

		}

	}

function getSessionId()

{ 

		$this->keepSession();

		if($this->obj->session->userdata('flash'))

		{

			if( !$this->obj->session->flashdata('id') )

				return 0;		

		}

		$offset = (int) $this->obj->config->item('id_offset');

		if(!$this->obj->session->userdata('flash'))

			$real_id = ($this->obj->session->userdata('id') / $offset);

		else

			$real_id = ($this->obj->session->flashdata('id') / $offset);

		if(ceil($real_id) != floor($real_id)) 

		{

			$this->logout();

			return 0;

		}

			else 

				return $real_id;

	}

	function keepSession()

	{

		if( ($this->obj->session->userdata('flash')) && ($this->obj->session->flashdata('expire') >= time()) ) 

		{

			$this->obj->session->keep_flashdata('id');

			$this->obj->session->set_flashdata('expire', time()+$this->obj->config->item('autologin_timeout'));

		}   		

	}

	/*

	 * Return TRUE if user is logged on

	 */

	function isLogged() { return (bool) $this->getSessionId();	}

	/*

	 * Return TRUE if user is in group

	 */

	function isGroup($group_name) 

	{

		return ($this->obj->aumodel->getRefId('augroup', $group_name) == $this->obj->aumodel->userInfo($this->getSessionId(), 'group_id')); 

	}

	/*

	 * Return TRUE if user has specified role

	 */

	function isRole($role_name) 

	{

		return ( $this->obj->aumodel->getRefId('aurole', $role_name) == $this->obj->aumodel->userInfo($this->getSessionId(), 'role_id') ); 

	}

	/*

	 * Show "deny access" page

	 */

	function denyAccess()

	{

		$this->obj->load->helper('url');

		redirect('au/denyaccess');

	}

	/*

	 * Create and return captcha

	 * Use standart CI plugin

	 */

	function getCaptcha()

	{

		$this->obj->load->helper('url');

		$this->obj->load->plugin('captcha');

		$vals = array(

						'word' => '',

						'img_path' => $this->obj->config->item('au_captcha_store_path'),

						'img_url' => $this->obj->config->item('au_captcha_img_url'),

						'font_path' => '/system/fonts/texb.ttf',

						'img_width' => '120',

						'img_height' => '40',

						'expiration' => '7200'

						);

		$cap = create_captcha($vals);

		return $cap;		

	}

}

?>