<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Auth
{
    private $CI;
    public $user;

    function __construct()
    {
        $this->CI =& get_instance();

        if( $user_id = $this->is_logged() )
        {
            $this->CI->db->select('user_id, user_role, user_username, user_email, user_active');
            $this->CI->db->where('user_id', $user_id);
            $query = $this->CI->db->get('{_}users');

            $result = $query->row();
            $query->free_result();

            foreach( $result as $key => $value )
            {
                $key = str_replace('user_', '', $key);
                $this->user->$key = $value;
            }
        }
    }

    public function login( $login, $password )
    {
        $password = sha1( $password . sha1($this->CI->config->item('salt')) );

        $user_id = $this->check_login( $login, $password );

        if( $user_id )
            $this->CI->session->set_userdata(array('user' => $user_id, 'logged_in' => TRUE, 'is_admin' => TRUE));

        return ( $user_id ) ? $user_id : FALSE;
    }

    public function logout()
    {
        if( $this->CI->session->userdata('logged_in') )
            $this->CI->session->sess_destroy();
    }

    public function is_logged()
    {
        $logged_in = $this->CI->session->userdata('logged_in');

        if( $logged_in )
            $user_id = $this->CI->session->userdata('user');

        return ( @$user_id > 1 ) ? $user_id : FALSE;
    }

    public function is_admin()
    {
        $logged_in = $this->CI->session->userdata('logged_in');

        if( $logged_in )
            $admin = $this->CI->session->userdata('is_admin');

        return ( @$admin ) ? $admin : FALSE;
    }

    private function check_login( $login, $password )
    {
        $this->CI->db->select('user_id');
        $this->CI->db->where("(user_username = '$login' OR user_email = '$login')");
        $this->CI->db->where(array('user_password' => $password, 'user_active' => USER_ACTIVE) );
        $this->CI->db->where("(user_role = " . USER_ADMIN . " OR user_role = ". USER_ROOT . ")");
        $query = $this->CI->db->get('{_}users');

        $result = $query->row_array();
        $query->free_result();

        return ( @$result['user_id'] ) ? $result['user_id'] : FALSE;
    }


}