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

class Auth_lib
{
    /**
     *
     * @var object
     */
    private $CI;

    /**
     * construct function
     */
    public function __construct()
    {
        $this->CI =& get_instance();

        $this->CI->load->library('session');
        $this->CI->load->helper('cookie');
        $this->CI->load->model('auth_mod');
    }

    /**
     * login the user
     *
     * @param string $email
     * @param string $password
     */
    public function login($email, $password, $remember_me)
    {
        $user = $this->CI->auth_mod->login($email, $password);

        if ($user)
        {
            $session = array(
                            'logged' => TRUE,
                            'id' => $user->id,
                            'name' => $user->name,
                            'email' => $user->email,
                            'last_login' => $user->last_login
                        );

            $this->create_session($session);

            if ($remember_me)
            {
                $value = sha1(uniqid(rand(), TRUE));

                $this->CI->auth_mod->create_cookie($user->id, $value);

                $cookie = array(
                        'name'   => 'remember_me',
                        'value'  => $value,
                        'expire' => '86500',
                        'domain' => '',
                        'path'   => '/',
                        'prefix' => '',
                        'secure' => TRUE
                );

                set_cookie($cookie);
            }
        }
    }

    /**
     * auto login the user for "remember me"
     *
     * @param integer $id
     */
    public function auto_login()
    {
        $cookie_value = get_cookie('remember_me');

        if ($this->session->userdata('logged') !== TRUE && $cookie_value)
        {
            $user = $this->CI->auth_mod->auto_login($cookie_value);

            if ($user)
            {
                $session = array(
                        'logged' => TRUE,
                        'id' => $user->id,
                        'name' => $user->name,
                        'email' => $user->email,
                        'last_login' => $user->last_login
                );

                $this->create_session($session);

                return TRUE;
            }
        }

        return FALSE;
    }

    /**
     * create user session
     *
     * @param array $session
     */
    public function create_session($session)
    {
        $user_role = $this->CI->auth_mod->get_user_role($session['id']);

        foreach ($user_role as $role)
        {
            if ($role === 99)
            {
                $this->session->set_userdata('admin', TRUE);
            }
        }

        $this->CI->auth_mod->update_last_login($session['id']);

        $this->CI->session->set_userdata($session);
    }

    /**
     * logout the user
     */
    public function logout()
    {
        $this->CI->session->sess_destroy();

        $cookie_value = get_cookie('remember_me');

        if ($cookie_value)
        {
            delete_cookie('remember_me');

            $this->CI->auth_mod->delete_cookie($cookie_value);
        }
    }

    /**
     * create forgotten password token
     *
     * @param integer $user_email
     */
    public function create_forgotten_password($user_email)
    {
        $user_id = $this->CI->auth_mod->get_user_id_by_email($user_email);

        if ($user_id)
        {
            $value = sha1(uniqid(rand(), TRUE));

            $this->CI->auth_mod->create_forgotten_password($user_email, $value);

            return $value;
        }

        return FALSE;
    }
}